[{"data":1,"prerenderedAt":834},["ShallowReactive",2],{"/en-us/blog/ci-deployment-and-environments":3,"navigation-en-us":42,"banner-en-us":452,"footer-en-us":462,"blog-post-authors-en-us-Ivan Nemytchenko|Cesar Saavedra":704,"blog-related-posts-en-us-ci-deployment-and-environments":730,"blog-promotions-en-us":771,"next-steps-en-us":824},{"id":4,"title":5,"authorSlugs":6,"body":9,"categorySlug":10,"config":11,"content":15,"description":9,"extension":29,"isFeatured":13,"meta":30,"navigation":31,"path":32,"publishedDate":22,"seo":33,"stem":37,"tagSlugs":38,"__hash__":41},"blogPosts/en-us/blog/ci-deployment-and-environments.yml","Ci Deployment And Environments",[7,8],"ivan-nemytchenko","cesar-saavedra",null,"engineering",{"slug":12,"featured":13,"template":14},"ci-deployment-and-environments",false,"BlogPost",{"title":16,"description":17,"authors":18,"heroImage":21,"date":22,"body":23,"category":10,"tags":24,"updatedDate":28},"How to use GitLab CI to deploy to multiple environments","We walk you through different scenarios to demonstrate the versatility and power of GitLab CI.",[19,20],"Ivan Nemytchenko","Cesar Saavedra","https://res.cloudinary.com/about-gitlab-com/image/upload/v1749662033/Blog/Hero%20Images/intro.jpg","2021-02-05","This post is a success story of one imaginary news portal, and you're the happy\nowner, the editor, and the only developer. Luckily, you already host your project\ncode on GitLab.com and know that you can\n[run tests with GitLab CI/CD](https://docs.gitlab.com/ee/ci/testing/).\nNow you’re curious if it can be [used for deployment](/blog/how-to-keep-up-with-ci-cd-best-practices/), and how far can you go with it.\n\nTo keep our story technology stack-agnostic, let's assume that the app is just a\nset of HTML files. No server-side code, no fancy JS assets compilation.\n\nDestination platform is also simplistic – we will use [Amazon S3](https://aws.amazon.com/s3/).\n\nThe goal of the article is not to give you a bunch of copy-pasteable snippets.\nThe goal is to show the principles and features of [GitLab CI](/solutions/continuous-integration/) so that you can easily apply them to your technology stack.\n\n\nLet’s start from the beginning. There's no continuous integration (CI) in our story yet.\n\n## At the starting line\n\n**Deployment**: In your case, it means that a bunch of HTML files should appear on your\nS3 bucket (which is already configured for\n[static website hosting](http://docs.aws.amazon.com/AmazonS3/latest/dev/HowDoIWebsiteConfiguration.html?shortFooter=true)).\n\nThere are a million ways to do it. We’ll use the\n[awscli](http://docs.aws.amazon.com/cli/latest/reference/s3/cp.html#examples) library,\nprovided by Amazon.\n\nThe full command looks like this:\n\n```shell\naws s3 cp ./ s3://yourbucket/ --recursive --exclude \"*\" --include \"*.html\"\n```\n\n![Manual deployment](https://about.gitlab.com/images/blogimages/ci-deployment-and-environments/13.jpg){: .center}\nPushing code to repository and deploying are separate processes.\n\n\nImportant detail: The command\n[expects you](http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html#config-settings-and-precedence)\nto provide `AWS_ACCESS_KEY_ID` and  `AWS_SECRET_ACCESS_KEY` environment\nvariables. Also you might need to specify `AWS_DEFAULT_REGION`.\n\n\nLet’s try to automate it using [GitLab CI](/solutions/continuous-integration/).\n\n## The first automated deployment\n\nWith GitLab, there's no difference on what commands to run.\nYou can set up GitLab CI in a way that tailors to your specific needs, as if it was your local terminal on your computer. As long as you execute commands there, you can tell CI to do the same for you in GitLab.\nPut your script to `.gitlab-ci.yml` and push your code – that’s it: CI triggers\na _job_ and your commands are executed.\n\nNow, let's add some context to our story: Our website is small, there is 20-30 daily\nvisitors and the code repository has only one default branch: `main`.\n\nLet's start by specifying a _job_ with the command from above in the `.gitlab-ci.yml` file:\n\n```yaml\ndeploy:\n  script: aws s3 cp ./ s3://yourbucket/ --recursive --exclude \"*\" --include \"*.html\"\n\n```\n\nNo luck:\n![Failed command](https://about.gitlab.com/images/blogimages/ci-deployment-and-environments/fail1.png){: .shadow}\n\nIt is our _job_ to ensure that there is an `aws` executable.\nTo install `awscli` we need `pip`, which is a tool for Python packages installation.\nLet's specify Docker image with preinstalled Python, which should contain `pip` as well:\n\n```yaml\ndeploy:\n  image: python:latest\n  script:\n  - pip install awscli\n  - aws s3 cp ./ s3://yourbucket/ --recursive --exclude \"*\" --include \"*.html\"\n\n```\n\n![Automated deployment](https://about.gitlab.com/images/blogimages/ci-deployment-and-environments/14.jpg){: .center}\nYou push your code to GitLab, and it is automatically deployed by CI.\nThe installation of `awscli` extends the job execution time, but that is not a big\ndeal for now. If you need to speed up the process, you can always [look for\na Docker image](https://hub.docker.com/explore/) with preinstalled `awscli`,\nor create an image by yourself.\n\n\nAlso, let’s not forget about these environment variables, which you've just grabbed\nfrom [AWS Console](https://console.aws.amazon.com/):\n\n```yaml\nvariables:\n  AWS_ACCESS_KEY_ID: \"AKIAIOSFODNN7EXAMPLE\"\n  AWS_SECRET_ACCESS_KEY: \"wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY\"\ndeploy:\n  image: python:latest\n  script:\n  - pip install awscli\n  - aws s3 cp ./ s3://yourbucket/ --recursive --exclude \"*\" --include \"*.html\"\n\n```\nIt should work, but keeping secret keys open, even in a private repository,\nis not a good idea. Let's see how to deal with this situation.\n\n### Keeping secret things secret\n\nGitLab has a special place for secret variables: **Settings > CI/CD > Variables**\n\n![Picture of Variables page](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674076/Blog/Content%20Images/add-variable-updated.png)\n\nWhatever you put there will be turned into **environment variables**.\nChecking the \"Mask variable\" checkbox will obfuscate the variable in job logs. Also, checking the \"Protect variable\" checkbox will export the variable to only pipelines running on protected branches and tags. Users with Owner or Maintainer permissions to a project will have access to this section.\n\nWe could remove `variables` section from our CI configuration. However, let’s use it for another purpose.\n\n### How to specify and use variables that are not secret\n\nWhen your configuration gets bigger, it is convenient to keep some of the\nparameters as variables at the beginning of your configuration. Especially if you\nuse them in more than one place. Although it is not the case in our situation yet,\nlet's set the S3 bucket name as a [**variable**](https://docs.gitlab.com/ee/ci/variables/) for the purpose of this demonstration:\n\n```yaml\nvariables:\n  S3_BUCKET_NAME: \"yourbucket\"\ndeploy:\n  image: python:latest\n  script:\n  - pip install awscli\n  - aws s3 cp ./ s3://$S3_BUCKET_NAME/ --recursive --exclude \"*\" --include \"*.html\"\n\n```\n\nSo far so good:\n\n![Successful build](https://about.gitlab.com/images/blogimages/ci-deployment-and-environments/build.png){: .shadow.medium.center}\n\nIn our hypothetical scenario, the audience of your website has grown, so you've hired a developer to help you.\nNow you have a team. Let's see how teamwork changes the GitLab CI workflow.\n\n## How to use GitLab CI with a team\n\nNow, that there are two users working in the same repository, it is no longer convenient\nto use the `main` branch for development. You decide to use separate branches\nfor both new features and new articles and merge them into `main` when they are ready.\n\nThe problem is that your current CI config doesn’t care about branches at all.\nWhenever you push anything to GitLab, it will be deployed to S3.\n\nPreventing this problem is straightforward. Just add `only: main` to your `deploy` job.\n\n![Automated deployment of main branch](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674076/Blog/Content%20Images/15-updated.png){: .center}\nYou don't want to deploy every branch to the production website but it would also be nice to preview your changes from feature-branches somehow.\n\n\n### How to set up a separate place for testing code\n\nThe person you recently hired, let's call him Patrick, reminds you that there is a featured called\n[GitLab Pages](https://docs.gitlab.com/ee/user/project/pages/). It looks like a perfect candidate for\na place to preview your work in progress.\n\nTo [host websites on GitLab Pages](/blog/gitlab-pages-setup/) your CI configuration file should satisfy three simple rules:\n\n- The _job_ should be named `pages`\n- There should be an `artifacts` section with folder `public` in it\n- Everything you want to host should be in this `public` folder\n\nThe contents of the public folder will be hosted at `http://\u003Cusername>.gitlab.io/\u003Cprojectname>/`\n\n\nAfter applying the [example config for plain-html websites](https://gitlab.com/pages/plain-html/blob/master/.gitlab-ci.yml),\nthe full CI configuration looks like this:\n\n```yaml\nvariables:\n  S3_BUCKET_NAME: \"yourbucket\"\n\ndeploy:\n  image: python:latest\n  script:\n  - pip install awscli\n  - aws s3 cp ./ s3://$S3_BUCKET_NAME/ --recursive --exclude \"*\" --include \"*.html\"\n  only:\n  - main\n\npages:\n  image: alpine:latest\n  script:\n  - mkdir -p ./public\n  - cp ./*.html ./public/\n  artifacts:\n    paths:\n    - public\n  except:\n  - main\n\n```\n\nWe specified two jobs. One job deploys the website for your customers to S3 (`deploy`).\nThe other one (`pages`) deploys the website to GitLab Pages.\nWe can name them \"Production environment\" and \"Staging environment\", respectively.\n\n![Deployment to two places](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674076/Blog/Content%20Images/16-updated.png){: .center}\nAll branches, except main, will be deployed to GitLab Pages.\n\n\n## Introducing environments\n\nGitLab offers\n [support for environments](https://docs.gitlab.com/ee/ci/environments/) (including dynamic environments and static environments),\n and all you need to do it to specify the corresponding environment for each deployment *job*:\n\n```yaml\nvariables:\n  S3_BUCKET_NAME: \"yourbucket\"\n\ndeploy to production:\n  environment: production\n  image: python:latest\n  script:\n  - pip install awscli\n  - aws s3 cp ./ s3://$S3_BUCKET_NAME/ --recursive --exclude \"*\" --include \"*.html\"\n  only:\n  - main\n\npages:\n  image: alpine:latest\n  environment: staging\n  script:\n  - mkdir -p ./public\n  - cp ./*.html ./public/\n  artifacts:\n    paths:\n    - public\n  except:\n  - main\n\n```\n\nGitLab keeps track of your deployments, so you always know what is currently being deployed on your servers:\n\n![List of environments](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674076/Blog/Content%20Images/envs-updated.png){: .shadow.center}\n\nGitLab provides full history of your deployments for each of your current environments:\n\n![List of deployments to staging environment](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674077/Blog/Content%20Images/staging-env-detail-updated.png){: .shadow.center}\n\n![Environments](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674077/Blog/Content%20Images/17-updated.png){: .center}\n\nNow, with everything automated and set up, we’re ready for the new challenges that are just around the corner.\n\n## How to troubleshoot deployments\n\nIt has just happened again.\nYou've pushed your feature-branch to preview it on staging and a minute later Patrick pushed\nhis branch, so the staging environment was rewritten with his work. Aargh!! It was the third time today!\n\nIdea! \u003Ci class=\"far fa-lightbulb\" style=\"color:#FFD900; font-size:.85em\" aria-hidden=\"true\">\u003C/i> Let's use Slack to notify us of deployments, so that people will not push their stuff if another one has been just deployed!\n\n> Learn how to [integrate GitLab with Slack](https://docs.gitlab.com/ee/user/project/integrations/gitlab_slack_application.html).\n\n## Teamwork at scale\n\nAs the time passed, your website became really popular, and your team has grown from two people to eight people.\nPeople develop in parallel, so the situation when people wait for each other to\npreview something on Staging has become pretty common. \"Deploy every branch to staging\" stopped working.\n\n![Queue of branches for review on Staging](https://about.gitlab.com/images/blogimages/ci-deployment-and-environments/queue.jpg){: .center}\n\nIt's time to modify the process one more time. You and your team agreed that if\nsomeone wants to see their changes on the staging\nserver, they should first merge the changes to the \"staging\" branch.\n\nThe change of `.gitlab-ci.yml` is minimal:\n\n```yaml\nexcept:\n- main\n```\n\nis now changed to\n\n```yaml\nonly:\n- staging\n```\n\n![Staging branch](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674077/Blog/Content%20Images/18-updated.png){: .center}\nPeople have to merge their feature branches before preview on the staging server.\n\n\nOf course, it requires additional time and effort for merging, but everybody agreed that it is better than waiting.\n\n### How to handle emergencies\n\nYou can't control everything, so sometimes things go wrong. Someone merged branches incorrectly and\npushed the result straight to production exactly when your site was on top of HackerNews.\nThousands of people saw your completely broken layout instead of your shiny main page.\n\nLuckily, someone found the **Rollback** button, so the\nwebsite was fixed a minute after the problem was discovered.\n\n![List of environments](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674077/Blog/Content%20Images/prod-env-rollback-arrow-updated.png){: .shadow.center}\nRollback relaunches the previous job with the previous commit\n\n\nAnyway, you felt that you needed to react to the problem and decided to turn off\nauto-deployment to Production and switch to manual deployment.\nTo do that, you needed to add `when: manual` to your _job_.\n\nAs you expected, there will be no automatic deployment to Production after that.\nTo deploy manually go to **CI/CD > Pipelines**, and click the button:\n\n![Skipped job is available for manual launch](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674076/Blog/Content%20Images/manual-pipeline-arrow-updated.png){: .shadow.center}\n\nFast forward in time. Finally, your company has turned into a corporation. Now, you have hundreds of people working on the website,\nso all the previous compromises no longer work.\n\n### Time to start using Review Apps\n\nThe next logical step is to boot up a temporary instance of the application per feature branch for review.\n\nIn our case, we set up another bucket on S3 for that. The only difference is that\nwe copy the contents of our website to a \"folder\" with the name of the\nthe development branch, so that the URL looks like this:\n\n`http://\u003CREVIEW_S3_BUCKET_NAME>.s3-website-us-east-1.amazonaws.com/\u003Cbranchname>/`\n\nHere's the replacement for the `pages` _job_ we used before:\n\n```yaml\nreview apps:\n  variables:\n    S3_BUCKET_NAME: \"reviewbucket\"\n  image: python:latest\n  environment: review\n  script:\n  - pip install awscli\n  - mkdir -p ./$CI_BUILD_REF_NAME\n  - cp ./*.html ./$CI_BUILD_REF_NAME/\n  - aws s3 cp ./ s3://$S3_BUCKET_NAME/ --recursive --exclude \"*\" --include \"*.html\"\n\n```\n\nThe interesting thing is where we got this `$CI_BUILD_REF_NAME` variable from.\nGitLab predefines [many environment variables](https://docs.gitlab.com/ee/ci/variables/predefined_variables.html) so that you can use them in your jobs.\n\nNote that we defined the `S3_BUCKET_NAME` variable inside the *job*. You can do this to rewrite top-level definitions.\n\n\nVisual representation of this configuration:\n![Review apps]![How to use GitLab CI - update - 19 - updated](https://res.cloudinary.com/about-gitlab-com/image/upload/v1749674077/Blog/Content%20Images/19-updated.png){: .illustration}\n\nThe details of the Review Apps implementation varies widely, depending upon your real technology\nstack and on your deployment process, which is outside the scope of this blog post.\n\nIt will not be that straightforward, as it is with our static HTML website.\nFor example, you had to make these instances temporary, and booting up these instances\nwith all required software and services automatically on the fly is not a trivial task.\nHowever, it is doable, especially if you use Docker containers, or at least Chef or Ansible.\n\nWe'll cover deployment with Docker in a future blog post.\nI feel a bit guilty for simplifying the deployment process to a simple HTML files copying, and not\nadding some hardcore scenarios. If you need some right now, I recommend you read the article [\"Building an Elixir Release into a Docker image using GitLab CI.\"](/blog/building-an-elixir-release-into-docker-image-using-gitlab-ci-part-1/)\n\nFor now, let's talk about one final thing.\n\n### Deploying to different platforms\n\nIn real life, we are not limited to S3 and GitLab Pages. We host, and therefore,\ndeploy our apps and packages to various services.\n\nMoreover, at some point, you could decide to move to a new platform and will need to rewrite all your deployment scripts.\nYou can use a gem called `dpl` to minimize the damage.\n\nIn the examples above we used `awscli` as a tool to deliver code to an example\nservice (Amazon S3).\nHowever, no matter what tool and what destination system you use, the principle is the same:\nYou run a command with some parameters and somehow pass a secret key for authentication purposes.\n\nThe `dpl` deployment tool utilizes this principle and provides a\nunified interface for [this list of providers](https://github.com/travis-ci/dpl#supported-providers).\n\nHere's how a production deployment _job_ would look if we use `dpl`:\n\n```yaml\nvariables:\n  S3_BUCKET_NAME: \"yourbucket\"\n\ndeploy to production:\n  environment: production\n  image: ruby:latest\n  script:\n  - gem install dpl\n  - dpl --provider=s3 --bucket=$S3_BUCKET_NAME\n  only:\n  - main\n\n```\n\nIf you deploy to different systems or change destination platform frequently, consider\nusing `dpl` to make your deployment scripts look uniform.\n\n## Five key takeaways\n\n1. Deployment is just a command (or a set of commands) that is regularly executed. Therefore it can run inside GitLab CI.\n2. Most times you'll need to provide some secret key(s) to the command you execute. Store these secret keys in **Settings > CI/CD > Variables**.\n3. With GitLab CI, you can flexibly specify which branches to deploy to.\n4. If you deploy to multiple environments, GitLab will conserve the history of deployments,\nwhich allows you to rollback to any previous version.\n5. 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CI/CD tools can run a build and ship a deployment. Where they diverge is what happens when your delivery needs get real: a monorepo with a dozen services, microservices spread across multiple repositories, deployments to dozens of environments, or a platform team trying to enforce standards without becoming a bottleneck.\n  \nGitLab's pipeline execution model was designed for that complexity. Parent-child pipelines, DAG execution, dynamic pipeline generation, multi-project triggers, merge request pipelines with merged results, and CI/CD Components each solve a distinct class of problems. Because they compose, understanding the full model unlocks something more than a faster pipeline. In this article, you'll learn about the five patterns where that model stands out, each mapped to a real engineering scenario with the configuration to match.\n  \nThe configs below are illustrative. The scripts use echo commands to keep the signal-to-noise ratio low. Swap them out for your actual build, test, and deploy steps and they are ready to use.\n\n\n## 1. Monorepos: Parent-child pipelines + DAG execution\n\n\nThe problem: Your monorepo has a frontend, a backend, and a docs site. Every commit triggers a full rebuild of everything, even when only a README changed.\n\n\nGitLab solves this with two complementary features: [parent-child pipelines](https://docs.gitlab.com/ci/pipelines/downstream_pipelines/#parent-child-pipelines) (which let a top-level pipeline spawn isolated sub-pipelines) and [DAG execution via `needs`](https://docs.gitlab.com/ci/yaml/#needs) (which breaks rigid stage-by-stage ordering and lets jobs start the moment their dependencies finish).\n\n\nA parent pipeline detects what changed and triggers only the relevant child pipelines:\n\n```yaml\n# .gitlab-ci.yml\nstages:\n  - trigger\n\ntrigger-services:\n  stage: trigger\n  trigger:\n    include:\n      - local: '.gitlab/ci/api-service.yml'\n      - local: '.gitlab/ci/web-service.yml'\n      - local: '.gitlab/ci/worker-service.yml'\n    strategy: depend\n```\n\n\nEach child pipeline is a fully independent pipeline with its own stages, jobs, and artifacts. The parent waits for all of them via [strategy: depend](https://docs.gitlab.com/ci/pipelines/downstream_pipelines/#wait-for-downstream-pipeline-to-complete) so you get a single green/red signal at the top level, with full drill-down into each service's pipeline. This organizational separation is the bigger win for large teams: each service owns its pipeline config, changes in one cannot break another, and the complexity stays manageable as the repo grows.\n\n\nOne thing worth knowing: when you pass [multiple files to a single `trigger: include:`](https://docs.gitlab.com/ci/pipelines/downstream_pipelines/#combine-multiple-child-pipeline-configuration-files), GitLab merges them into a single child pipeline configuration. This means jobs defined across those files share the same pipeline context and can reference each other with `needs:`, which is what makes the DAG optimization possible. If you split them into separate trigger jobs instead, each would be its own isolated pipeline and cross-file `needs:` references would not work.\n\n\nCombine this with `needs:` inside each child pipeline and you get DAG execution. Your integration tests can start the moment the build finishes, without waiting for other jobs in the same stage.\n\n```yaml\n# .gitlab/ci/api-service.yml\nstages:\n  - build\n  - test\n\nbuild-api:\n  stage: build\n  script:\n    - echo \"Building API service\"\n\ntest-api:\n  stage: test\n  needs: [build-api]\n  script:\n    - echo \"Running API tests\"\n```\n\n\nWhy it matters: Teams with large monorepos typically report significant reductions in pipeline runtime after switching to DAG execution, since jobs no longer wait on unrelated work in the same stage. Parent-child pipelines add the organizational layer that keeps the configuration maintainable as the repo and team grow.\n\n![Local downstream pipelines](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738759/Blog/Imported/hackathon-fake-blog-post-s/image3_vwj3rz.png \"Local downstream pipelines\")\n\n## 2. Microservices: Cross-repo, multi-project pipelines\n\n\nThe problem: Your frontend lives in one repo, your backend in another. When the frontend team ships a change, they have no visibility into whether it broke the backend integration and vice versa.\n\n\nGitLab's [multi-project pipelines](https://docs.gitlab.com/ci/pipelines/downstream_pipelines/#multi-project-pipelines) let one project trigger a pipeline in a completely separate project and wait for the result. The triggering project gets a linked downstream pipeline right in its own pipeline view.\n\n\nThe frontend pipeline builds an API contract artifact and publishes it, then triggers the backend pipeline. The backend fetches that artifact directly using the [Jobs API](https://docs.gitlab.com/ee/api/jobs.html#download-a-single-artifact-file-from-specific-tag-or-branch) and validates it before allowing anything to proceed. If a breaking change is detected, the backend pipeline fails and the frontend pipeline fails with it.\n\n```yaml\n# frontend repo: .gitlab-ci.yml\nstages:\n  - build\n  - test\n  - trigger-backend\n\nbuild-frontend:\n  stage: build\n  script:\n    - echo \"Building frontend and generating API contract...\"\n    - mkdir -p dist\n    - |\n      echo '{\n        \"api_version\": \"v2\",\n        \"breaking_changes\": false\n      }' > dist/api-contract.json\n    - cat dist/api-contract.json\n  artifacts:\n    paths:\n      - dist/api-contract.json\n    expire_in: 1 hour\n\ntest-frontend:\n  stage: test\n  script:\n    - echo \"All frontend tests passed!\"\n\ntrigger-backend-pipeline:\n  stage: trigger-backend\n  trigger:\n    project: my-org/backend-service\n    branch: main\n    strategy: depend\n  rules:\n    - if: $CI_COMMIT_BRANCH == \"main\"\n```\n\n```yaml\n# backend repo: .gitlab-ci.yml\nstages:\n  - build\n  - test\n\nbuild-backend:\n  stage: build\n  script:\n    - echo \"All backend tests passed!\"\n\nintegration-test:\n  stage: test\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"pipeline\"\n  script:\n    - echo \"Fetching API contract from frontend...\"\n    - |\n      curl --silent --fail \\\n        --header \"JOB-TOKEN: $CI_JOB_TOKEN\" \\\n        --output api-contract.json \\\n        \"${CI_API_V4_URL}/projects/${FRONTEND_PROJECT_ID}/jobs/artifacts/main/raw/dist/api-contract.json?job=build-frontend\"\n    - cat api-contract.json\n    - |\n      if grep -q '\"breaking_changes\": true' api-contract.json; then\n        echo \"FAIL: Breaking API changes detected - backend integration blocked!\"\n        exit 1\n      fi\n      echo \"PASS: API contract is compatible!\"\n```\n\n\nA few things worth noting in this config. The `integration-test` job uses `$CI_PIPELINE_SOURCE == \"pipeline\"` to ensure it only runs when triggered by an upstream pipeline, not on a standalone push to the backend repo. The frontend project ID is referenced via `$FRONTEND_PROJECT_ID`, which should be set as a [CI/CD variable](https://docs.gitlab.com/ci/variables/) in the backend project settings to avoid hardcoding it.\n\n\nWhy it matters: Cross-service breakage that previously surfaced in production gets caught in the pipeline instead. The dependency between services stops being invisible and becomes something teams can see, track, and act on.\n\n\n![Cross-project pipelines](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738762/Blog/Imported/hackathon-fake-blog-post-s/image4_h6mfsb.png \"Cross-project pipelines\")\n\n\n## 3. Multi-tenant / matrix deployments: Dynamic child pipelines\n\n\nThe problem: You deploy the same application to 15 customer environments, or three cloud regions, or dev/staging/prod. Updating a deploy stage across all of them one by one is the kind of work that leads to configuration drift. Writing a separate pipeline for each environment is unmaintainable from day one.\n\n\nGitLab's [dynamic child pipelines](https://docs.gitlab.com/ci/pipelines/downstream_pipelines/#dynamic-child-pipelines) let you generate a pipeline at runtime. A job runs a script that produces a YAML file, and that YAML becomes the pipeline for the next stage. The pipeline structure itself becomes data.\n\n\n```yaml\n# .gitlab-ci.yml\nstages:\n  - generate\n  - trigger-environments\n\ngenerate-config:\n  stage: generate\n  script:\n    - |\n      # ENVIRONMENTS can be passed as a CI variable or read from a config file.\n      # Default to dev, staging, prod if not set.\n      ENVIRONMENTS=${ENVIRONMENTS:-\"dev staging prod\"}\n      for ENV in $ENVIRONMENTS; do\n        cat > ${ENV}-pipeline.yml \u003C\u003C EOF\n      stages:\n        - deploy\n        - verify\n      deploy-${ENV}:\n        stage: deploy\n        script:\n          - echo \"Deploying to ${ENV} environment\"\n      verify-${ENV}:\n        stage: verify\n        script:\n          - echo \"Running smoke tests on ${ENV}\"\n      EOF\n      done\n  artifacts:\n    paths:\n      - \"*.yml\"\n    exclude:\n      - \".gitlab-ci.yml\"\n\n.trigger-template:\n  stage: trigger-environments\n  trigger:\n    strategy: depend\n\ntrigger-dev:\n  extends: .trigger-template\n  trigger:\n    include:\n      - artifact: dev-pipeline.yml\n        job: generate-config\n\ntrigger-staging:\n  extends: .trigger-template\n  needs: [trigger-dev]\n  trigger:\n    include:\n      - artifact: staging-pipeline.yml\n        job: generate-config\n\ntrigger-prod:\n  extends: .trigger-template\n  needs: [trigger-staging]\n  trigger:\n    include:\n      - artifact: prod-pipeline.yml\n        job: generate-config\n  when: manual\n```\n\n\nThe generation script loops over an `ENVIRONMENTS` variable rather than hardcoding each environment separately. Pass in a different list via a CI variable or read it from a config file and the pipeline adapts without touching the YAML. The trigger jobs use [extends:](https://docs.gitlab.com/ci/yaml/#extends) to inherit shared configuration from `.trigger-template`, so `strategy: depend` is defined once rather than repeated on every trigger job. Add a new environment by updating the variable, not by duplicating pipeline config. Add [when: manual](https://docs.gitlab.com/ci/yaml/#when) to the production trigger and you get a promotion gate baked right into the pipeline graph.\n\n\nWhy it matters: SaaS companies and platform teams use this pattern to manage dozens of environments without duplicating pipeline logic. The pipeline structure itself stays lean as the deployment matrix grows.\n\n\n![Dynamic pipeline](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738765/Blog/Imported/hackathon-fake-blog-post-s/image7_wr0kx2.png \"Dynamic pipeline\")\n\n\n## 4. MR-first delivery: Merge request pipelines, merged results, and workflow routing\n\n\nThe problem: Your pipeline runs on every push to every branch. Expensive tests run on feature branches that will never merge. Meanwhile, you have no guarantee that what you tested is actually what will land on `main` after a merge.\n\n\nGitLab has three interlocking features that solve this together:\n\n\n*   [Merge request pipelines](https://docs.gitlab.com/ci/pipelines/merge_request_pipelines/) run only when a merge request exists, not on every branch push. This alone eliminates a significant amount of wasted compute.\n\n*   [Merged results pipelines](https://docs.gitlab.com/ci/pipelines/merged_results_pipelines/) go further. GitLab creates a temporary merge commit (your branch plus the current target branch) and runs the pipeline against that. You are testing what will actually exist after the merge, not just your branch in isolation.\n\n*   [Workflow rules](https://docs.gitlab.com/ci/yaml/workflow/) let you define exactly which pipeline type runs under which conditions and suppress everything else. The `$CI_OPEN_MERGE_REQUESTS` guard below prevents duplicate pipelines firing for both a branch and its open MR simultaneously.\n\n\nWith those three working together, here is what a tiered pipeline looks like:\n\n```yaml\n# .gitlab-ci.yml\nworkflow:\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"merge_request_event\"\n    - if: $CI_COMMIT_BRANCH && $CI_OPEN_MERGE_REQUESTS\n      when: never\n    - if: $CI_COMMIT_BRANCH\n    - if: $CI_PIPELINE_SOURCE == \"schedule\"\n\nstages:\n  - fast-checks\n  - expensive-tests\n  - deploy\n\nlint-code:\n  stage: fast-checks\n  script:\n    - echo \"Running linter\"\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"push\"\n    - if: $CI_PIPELINE_SOURCE == \"merge_request_event\"\n    - if: $CI_COMMIT_BRANCH == \"main\"\n\nunit-tests:\n  stage: fast-checks\n  script:\n    - echo \"Running unit tests\"\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"push\"\n    - if: $CI_PIPELINE_SOURCE == \"merge_request_event\"\n    - if: $CI_COMMIT_BRANCH == \"main\"\n\nintegration-tests:\n  stage: expensive-tests\n  script:\n    - echo \"Running integration tests (15 min)\"\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"merge_request_event\"\n    - if: $CI_COMMIT_BRANCH == \"main\"\n\ne2e-tests:\n  stage: expensive-tests\n  script:\n    - echo \"Running E2E tests (30 min)\"\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"merge_request_event\"\n    - if: $CI_COMMIT_BRANCH == \"main\"\n\nnightly-comprehensive-scan:\n  stage: expensive-tests\n  script:\n    - echo \"Running full nightly suite (2 hours)\"\n  rules:\n    - if: $CI_PIPELINE_SOURCE == \"schedule\"\n\ndeploy-production:\n  stage: deploy\n  script:\n    - echo \"Deploying to production\"\n  rules:\n    - if: $CI_COMMIT_BRANCH == \"main\"\n      when: manual\n```\n\nWith this setup, the pipeline behaves differently depending on context. A push to a feature branch with no open MR runs lint and unit tests only. Once an MR is opened, the workflow rules switch from a branch pipeline to an MR pipeline, and the full integration and E2E suite runs against the merged result. Merging to `main` queues a manual production deployment. A nightly schedule runs the comprehensive scan once, not on every commit.\n\n\nWhy it matters: Teams routinely cut CI costs significantly with this pattern, not by running fewer tests, but by running the right tests at the right time. Merged results pipelines catch the class of bugs that only appear after a merge, before they ever reach `main`.\n\n\n![Conditional pipelines (within a branch with no MR)](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738768/Blog/Imported/hackathon-fake-blog-post-s/image6_dnfcny.png \"Conditional pipelines (within a branch with no MR)\")\n\n\n\n![Conditional pipelines (within an MR)](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738772/Blog/Imported/hackathon-fake-blog-post-s/image1_wyiafu.png \"Conditional pipelines (within an MR)\")\n\n\n\n![Conditional pipelines (on the main branch)](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738774/Blog/Imported/hackathon-fake-blog-post-s/image5_r6lkfd.png \"Conditional pipelines (on the main branch)\")\n\n## 5. Governed pipelines: CI/CD Components\n\n\nThe problem: Your platform team has defined the right way to build, test, and deploy. But every team has their own `.gitlab-ci.yml` with subtle variations. Security scanning gets skipped. Deployment standards drift. Audits are painful.\n\n\nGitLab [CI/CD Components](https://docs.gitlab.com/ci/components/) let platform teams publish versioned, reusable pipeline building blocks. Application teams consume them with a single `include:` line and optional inputs — no copy-paste, no drift. Components are discoverable through the [CI/CD Catalog](https://docs.gitlab.com/ci/components/#cicd-catalog), which means teams can find and adopt approved building blocks without needing to go through the platform team directly.\n\n\nHere is a component definition from a shared library:\n\n```yaml\n# templates/deploy.yml\nspec:\n  inputs:\n    stage:\n      default: deploy\n    environment:\n      default: production\n---\ndeploy-job:\n  stage: $[[ inputs.stage ]]\n  script:\n    - echo \"Deploying $APP_NAME to $[[ inputs.environment ]]\"\n    - echo \"Deploy URL: $DEPLOY_URL\"\n  environment:\n    name: $[[ inputs.environment ]]\n```\nAnd here is how an application team consumes it:\n\n```yaml\n# Application repo: .gitlab-ci.yml\nvariables:\n  APP_NAME: \"my-awesome-app\"\n  DEPLOY_URL: \"https://api.example.com\"\n\ninclude:\n  - component: gitlab.com/my-org/component-library/build@v1.0.6\n  - component: gitlab.com/my-org/component-library/test@v1.0.6\n  - component: gitlab.com/my-org/component-library/deploy@v1.0.6\n    inputs:\n      environment: staging\n\nstages:\n  - build\n  - test\n  - deploy\n```\n\nThree lines of `include:` replace hundreds of lines of duplicated YAML. The platform team can push a security fix to `v1.0.7` and teams opt in on their own schedule — or the platform team can pin everyone to a minimum version. Either way, one change propagates everywhere instead of needing to be applied repo by repo.\n\n\nPair this with [resource groups](https://docs.gitlab.com/ci/resource_groups/) to prevent concurrent deployments to the same environment, and [protected environments](https://docs.gitlab.com/ci/environments/protected_environments/) to enforce approval gates - and you have a governed delivery platform where compliance is the default, not the exception.\n\n\nWhy it matters: This is the pattern that makes GitLab CI/CD scale across hundreds of teams. Platform engineering teams enforce compliance without becoming a bottleneck. Application teams get a fast path to a working pipeline without reinventing the wheel.\n\n\n![Component pipeline (imported jobs)](https://res.cloudinary.com/about-gitlab-com/image/upload/v1775738776/Blog/Imported/hackathon-fake-blog-post-s/image2_pizuxd.png \"Component pipeline (imported jobs)\")\n\n## Putting it all together\n\nNone of these features exist in isolation. The reason GitLab's pipeline model is worth understanding deeply is that these primitives compose:\n\n*   A monorepo uses parent-child pipelines, and each child uses DAG execution\n\n*   A microservices platform uses multi-project pipelines, and each project uses MR pipelines with merged results\n\n*   A governed platform uses CI/CD components to standardize the patterns above across every team\n\n\nMost teams discover one of these features when they hit a specific pain point. The ones who invest in understanding the full model end up with a delivery system that actually reflects how their engineering organization works, not a pipeline that fights it.\n\n## Other patterns worth exploring\n\n\nThe five patterns above cover the most common structural pain points, but GitLab's pipeline model goes further. A few others worth looking into as your needs grow:\n\n\n*   [Review apps with dynamic environments](https://docs.gitlab.com/ci/environments/) let you spin up a live preview for every feature branch and tear it down automatically when the MR closes. Useful for teams doing frontend work or API changes that need stakeholder sign-off before merging.\n\n*   [Caching and artifact strategies](https://docs.gitlab.com/ci/caching/) are often the fastest way to cut pipeline runtime after the structural work is done. Structuring `cache:` keys around dependency lockfiles and being deliberate about what gets passed between jobs with [artifacts:](https://docs.gitlab.com/ci/yaml/#artifacts) can make a significant difference without changing your pipeline shape at all.\n\n*   [Scheduled and API-triggered pipelines](https://docs.gitlab.com/ci/pipelines/schedules/) are worth knowing about because not everything should run on a code push. Nightly security scans, compliance reports, and release automation are better modeled as scheduled or [API-triggered](https://docs.gitlab.com/ci/triggers/) pipelines with `$CI_PIPELINE_SOURCE` routing the right jobs for each context.\n\n## How to get started\n\nModern software delivery is complex. Teams are managing monorepos with dozens of services, coordinating across multiple repositories, deploying to many environments at once, and trying to keep standards consistent as organizations grow. GitLab's pipeline model was built with all of that in mind.\n\nWhat makes it worth investing time in is how well the pieces fit together. Parent-child pipelines bring structure to large codebases. Multi-project pipelines make cross-team dependencies visible and testable. Dynamic pipelines turn environment management into something that scales gracefully. MR-first delivery with merged results ensures confidence at every step of the review process. And CI/CD Components give platform teams a way to share best practices across an entire organization without becoming a bottleneck.\n\nEach of these features is powerful on its own, and even more so when combined. GitLab gives you the building blocks to design a delivery system that fits how your team actually works, and grows with you as your needs evolve.\n\n> [Start a free trial of GitLab Ultimate](https://about.gitlab.com/free-trial/) to use pipeline logic today.\n\n## Read more\n\n*   [Variable and artifact sharing in GitLab parent-child pipelines](https://about.gitlab.com/blog/variable-and-artifact-sharing-in-gitlab-parent-child-pipelines/)\n*   [CI/CD inputs: Secure and preferred method to pass parameters to a pipeline](https://about.gitlab.com/blog/ci-cd-inputs-secure-and-preferred-method-to-pass-parameters-to-a-pipeline/)\n*   [Tutorial: How to set up your first GitLab CI/CD component](https://about.gitlab.com/blog/tutorial-how-to-set-up-your-first-gitlab-ci-cd-component/)\n*   [How to include file references in your CI/CD components](https://about.gitlab.com/blog/how-to-include-file-references-in-your-ci-cd-components/)\n*   [FAQ: GitLab CI/CD Catalog](https://about.gitlab.com/blog/faq-gitlab-ci-cd-catalog/)\n*   [Building a GitLab CI/CD pipeline for a monorepo the easy way](https://about.gitlab.com/blog/building-a-gitlab-ci-cd-pipeline-for-a-monorepo-the-easy-way/)\n*   [A CI/CD component builder's journey](https://about.gitlab.com/blog/a-ci-component-builders-journey/)\n*   [CI/CD Catalog goes GA: No more building pipelines from scratch](https://about.gitlab.com/blog/ci-cd-catalog-goes-ga-no-more-building-pipelines-from-scratch/)","5 ways GitLab pipeline logic solves real engineering problems","Learn how to scale CI/CD with composable patterns for monorepos, microservices, environments, and governance.",[737],"Omid Khan","https://res.cloudinary.com/about-gitlab-com/image/upload/v1772721753/frfsm1qfscwrmsyzj1qn.png","2026-04-09",[111,741,27,742],"DevOps platform","features",{"featured":31,"template":14,"slug":744},"5-ways-gitlab-pipeline-logic-solves-real-engineering-problems",{"content":746,"config":756},{"title":747,"description":748,"authors":749,"heroImage":751,"date":752,"body":753,"category":10,"tags":754},"How to use GitLab Container Virtual Registry with Docker Hardened Images","Learn how to simplify container image management with this step-by-step guide.",[750],"Tim Rizzi","https://res.cloudinary.com/about-gitlab-com/image/upload/v1772111172/mwhgbjawn62kymfwrhle.png","2026-03-12","If you're a platform engineer, you've probably had this conversation:\n  \n*\"Security says we need to use hardened base images.\"*\n\n*\"Great, where do I configure credentials for yet another registry?\"*\n\n*\"Also, how do we make sure everyone actually uses them?\"*\n\nOr this one:\n\n*\"Why are our builds so slow?\"*\n\n*\"We're pulling the same 500MB image from Docker Hub in every single job.\"*\n\n*\"Can't we just cache these somewhere?\"*\n\nI've been working on [Container Virtual Registry](https://docs.gitlab.com/user/packages/virtual_registry/container/) at GitLab specifically to solve these problems. It's a pull-through cache that sits in front of your upstream registries — Docker Hub, dhi.io (Docker Hardened Images), MCR, and Quay — and gives your teams a single endpoint to pull from. Images get cached on the first pull. Subsequent pulls come from the cache. Your developers don't need to know or care which upstream a particular image came from.\n\nThis article shows you how to set up Container Virtual Registry, specifically with Docker Hardened Images in mind, since that's a combination that makes a lot of sense for teams concerned about security and not making their developers' lives harder.\n\n## What problem are we actually solving?\n\nThe Platform teams I usually talk to manage container images across three to five registries:\n\n* **Docker Hub** for most base images\n* **dhi.io** for Docker Hardened Images (security-conscious workloads)\n* **MCR** for .NET and Azure tooling\n* **Quay.io** for Red Hat ecosystem stuff\n* **Internal registries** for proprietary images\n\nEach one has its own:\n\n* Authentication mechanism\n* Network latency characteristics\n* Way of organizing image paths\n\nYour CI/CD configs end up littered with registry-specific logic. Credential management becomes a project unto itself. And every pipeline job pulls the same base images over the network, even though they haven't changed in weeks.\n\nContainer Virtual Registry consolidates this. One registry URL. One authentication flow (GitLab's). Cached images are served from GitLab's infrastructure rather than traversing the internet each time.\n\n## How it works\n\nThe model is straightforward:\n\n```text\nYour pipeline pulls:\n  gitlab.com/virtual_registries/container/1000016/python:3.13\n\nVirtual registry checks:\n  1. Do I have this cached? → Return it\n  2. No? → Fetch from upstream, cache it, return it\n\n```\n\nYou configure upstreams in priority order. When a pull request comes in, the virtual registry checks each upstream until it finds the image. The result gets cached for a configurable period (default 24 hours).\n\n```text\n┌─────────────────────────────────────────────────────────┐\n│                    CI/CD Pipeline                       │\n│                          │                              │\n│                          ▼                              │\n│   gitlab.com/virtual_registries/container/\u003Cid>/image   │\n└─────────────────────────────────────────────────────────┘\n                           │\n                           ▼\n┌─────────────────────────────────────────────────────────┐\n│            Container Virtual Registry                   │\n│                                                         │\n│  Upstream 1: Docker Hub ────────────────┐               │\n│  Upstream 2: dhi.io (Hardened) ────────┐│               │\n│  Upstream 3: MCR ─────────────────────┐││               │\n│  Upstream 4: Quay.io ────────────────┐│││               │\n│                                      ││││               │\n│                    ┌─────────────────┴┴┴┴──┐            │\n│                    │        Cache          │            │\n│                    │  (manifests + layers) │            │\n│                    └───────────────────────┘            │\n└─────────────────────────────────────────────────────────┘\n```\n\n## Why this matters for Docker Hardened Images\n\n[Docker Hardened Images](https://docs.docker.com/dhi/) are great because of the minimal attack surface, near-zero CVEs, proper software bills of materials (SBOMs), and SLSA provenance. If you're evaluating base images for security-sensitive workloads, they should be on your list.\n\nBut adopting them creates the same operational friction as any new registry:\n\n* **Credential distribution**: You need to get Docker credentials to every system that pulls images from dhi.io.\n* **CI/CD changes**: Every pipeline needs to be updated to authenticate with dhi.io.\n* **Developer friction**: People need to remember to use the hardened variants.\n* **Visibility gap**: It's difficult to tell if teams are actually using hardened images vs. regular ones.\n\nVirtual registry addresses each of these:\n\n**Single credential**: Teams authenticate to GitLab. The virtual registry handles upstream authentication. You configure Docker credentials once, at the registry level, and they apply to all pulls.\n\n**No CI/CD changes per-team**: Point pipelines at your virtual registry. Done. The upstream configuration is centralized.\n\n**Gradual adoption**: Since images get cached with their full path, you can see in the cache what's being pulled. If someone's pulling `library/python:3.11` instead of the hardened variant, you'll know.\n\n**Audit trail**: The cache shows you exactly which images are in active use. Useful for compliance, useful for understanding what your fleet actually depends on.\n\n## Setting it up\n\nHere's a real setup using the Python client from this demo project.\n\n### Create the virtual registry\n\n```python\nfrom virtual_registry_client import VirtualRegistryClient\n\nclient = VirtualRegistryClient()\n\nregistry = client.create_virtual_registry(\n    group_id=\"785414\",  # Your top-level group ID\n    name=\"platform-images\",\n    description=\"Cached container images for platform teams\"\n)\n\nprint(f\"Registry ID: {registry['id']}\")\n# You'll need this ID for the pull URL\n```\n\n### Add Docker Hub as an upstream\n\nFor official images like Alpine, Python, etc.:\n\n```python\ndocker_upstream = client.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://registry-1.docker.io\",\n    name=\"Docker Hub\",\n    cache_validity_hours=24\n)\n```\n\n### Add Docker Hardened Images (dhi.io)\n\nDocker Hardened Images are hosted on `dhi.io`, a separate registry that requires authentication:\n\n```python\ndhi_upstream = client.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://dhi.io\",\n    name=\"Docker Hardened Images\",\n    username=\"your-docker-username\",\n    password=\"your-docker-access-token\",\n    cache_validity_hours=24\n)\n```\n\n### Add other upstreams\n\n```python\n# MCR for .NET teams\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://mcr.microsoft.com\",\n    name=\"Microsoft Container Registry\",\n    cache_validity_hours=48\n)\n\n# Quay for Red Hat stuff\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://quay.io\",\n    name=\"Quay.io\",\n    cache_validity_hours=24\n)\n```\n\n### Update your CI/CD\n\nHere's a `.gitlab-ci.yml` that pulls through the virtual registry:\n\n```yaml\nvariables:\n  VIRTUAL_REGISTRY_ID: \u003Cyour_virtual_registry_ID>\n\n  \nbuild:\n  image: docker:24\n  services:\n    - docker:24-dind\n  before_script:\n    # Authenticate to GitLab (which handles upstream auth for you)\n    - echo \"${CI_JOB_TOKEN}\" | docker login -u gitlab-ci-token --password-stdin gitlab.com\n  script:\n    # All of these go through your single virtual registry\n    \n    # Official Docker Hub images (use library/ prefix)\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/library/alpine:latest\n    \n    # Docker Hardened Images from dhi.io (no prefix needed)\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/python:3.13\n    \n    # .NET from MCR\n    - docker pull gitlab.com/virtual_registries/container/${VIRTUAL_REGISTRY_ID}/dotnet/sdk:8.0\n```\n\n### Image path formats\n\nDifferent registries use different path conventions:\n\n| Registry | Pull URL Example |\n|----------|------------------|\n| Docker Hub (official) | `.../library/python:3.11-slim` |\n| Docker Hardened Images (dhi.io) | `.../python:3.13` |\n| MCR | `.../dotnet/sdk:8.0` |\n| Quay.io | `.../prometheus/prometheus:latest` |\n\n### Verify it's working\n\nAfter some pulls, check your cache:\n\n```python\nupstreams = client.list_registry_upstreams(registry['id'])\nfor upstream in upstreams:\n    entries = client.list_cache_entries(upstream['id'])\n    print(f\"{upstream['name']}: {len(entries)} cached entries\")\n\n```\n\n## What the numbers look like\n\nI ran tests pulling images through the virtual registry:\n\n| Metric | Without Cache | With Warm Cache |\n|--------|---------------|-----------------|\n| Pull time (Alpine) | 10.3s | 4.2s |\n| Pull time (Python 3.13 DHI) | 11.6s | ~4s |\n| Network roundtrips to upstream | Every pull | Cache misses only |\n\n\n\n\nThe first pull is the same speed (it has to fetch from upstream). Every pull after that, for the cache validity period, comes straight from GitLab's storage. No network hop to Docker Hub, dhi.io, MCR, or wherever the image lives.\n\nFor a team running hundreds of pipeline jobs per day, that's hours of cumulative build time saved.\n\n## Practical considerations\nHere are some considerations to keep in mind:\n\n### Cache validity\n\n24 hours is the default. For security-sensitive images where you want patches quickly, consider 12 hours or less:\n\n```python\nclient.create_upstream(\n    registry_id=registry['id'],\n    url=\"https://dhi.io\",\n    name=\"Docker Hardened Images\",\n    username=\"your-username\",\n    password=\"your-token\",\n    cache_validity_hours=12\n)\n```\n\nFor stable, infrequently-updated images (like specific version tags), longer validity is fine.\n\n### Upstream priority\n\nUpstreams are checked in order. If you have images with the same name on different registries, the first matching upstream wins.\n\n### Limits\n\n* Maximum of 20 virtual registries per group\n* Maximum of 20 upstreams per virtual registry\n\n## Configuration via UI\n\nYou can also configure virtual registries and upstreams directly from the GitLab UI—no API calls required. Navigate to your group's **Settings > Packages and registries > Virtual Registry** to:\n\n* Create and manage virtual registries\n* Add, edit, and reorder upstream registries\n* View and manage the cache\n* Monitor which images are being pulled\n\n## What's next\n\nWe're actively developing:\n\n* **Allow/deny lists**: Use regex to control which images can be pulled from specific upstreams.\n\nThis is beta software. It works, people are using it in production, but we're still iterating based on feedback.\n\n## Share your feedback\n\nIf you're a platform engineer dealing with container registry sprawl, I'd like to understand your setup:\n\n* How many upstream registries are you managing?\n* What's your biggest pain point with the current state?\n* Would something like this help, and if not, what's missing?\n\nPlease share your experiences in the [Container Virtual Registry feedback issue](https://gitlab.com/gitlab-org/gitlab/-/work_items/589630).\n## Related resources\n- [New GitLab metrics and registry features help reduce CI/CD bottlenecks](https://about.gitlab.com/blog/new-gitlab-metrics-and-registry-features-help-reduce-ci-cd-bottlenecks/#container-virtual-registry)\n- [Container Virtual Registry documentation](https://docs.gitlab.com/user/packages/virtual_registry/container/)\n- [Container Virtual Registry API](https://docs.gitlab.com/api/container_virtual_registries/)",[27,755,742],"product",{"featured":13,"template":14,"slug":757},"using-gitlab-container-virtual-registry-with-docker-hardened-images",{"content":759,"config":769},{"title":760,"description":761,"authors":762,"heroImage":764,"date":765,"category":10,"tags":766,"body":768},"How IIT Bombay students are coding the future with GitLab","At GitLab, we often talk about how software accelerates innovation. But sometimes, you have to step away from the Zoom calls and stand in a crowded university hall to remember why we do this.",[763],"Nick Veenhof","https://res.cloudinary.com/about-gitlab-com/image/upload/v1750099013/Blog/Hero%20Images/Blog/Hero%20Images/blog-image-template-1800x945%20%2814%29_6VTUA8mUhOZNDaRVNPeKwl_1750099012960.png","2026-01-08",[264,626,767],"open source","The GitLab team recently had the privilege of judging the **iHack Hackathon** at **IIT Bombay's E-Summit**. The energy was electric, the coffee was flowing, and the talent was undeniable. But what struck us most wasn't just the code — it was the sheer determination of students to solve real-world problems, often overcoming significant logistical and financial hurdles to simply be in the room.\n\n\nThrough our [GitLab for Education program](https://about.gitlab.com/solutions/education/), we aim to empower the next generation of developers with tools and opportunity. Here is a look at what the students built, and how they used GitLab to bridge the gap between idea and reality.\n\n## The challenge: Build faster, build securely\n\nThe premise for the GitLab track of the hackathon was simple: Don't just show us a product; show us how you built it. We wanted to see how students utilized GitLab's platform — from Issue Boards to CI/CD pipelines — to accelerate the development lifecycle.\n\nThe results were inspiring.\n\n## The winners\n\n### 1st place: Team Decode — Democratizing Scientific Research\n\n**Project:** FIRE (Fast Integrated Research Environment)\n\nTeam Decode took home the top prize with a solution that warms a developer's heart: a local-first, blazing-fast data processing tool built with [Rust](https://about.gitlab.com/blog/secure-rust-development-with-gitlab/) and Tauri. They identified a massive pain point for data science students: existing tools are fragmented, slow, and expensive.\n\nTheir solution, FIRE, allows researchers to visualize complex formats (like NetCDF) instantly. What impressed the judges most was their \"hacker\" ethos. They didn't just build a tool; they built it to be open and accessible.\n\n**How they used GitLab:** Since the team lived far apart, asynchronous communication was key. They utilized **GitLab Issue Boards** and **Milestones** to track progress and integrated their repo with Telegram to get real-time push notifications. As one team member noted, \"Coordinating all these technologies was really difficult, and what helped us was GitLab... the Issue Board really helped us track who was doing what.\"\n\n![Team Decode](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/epqazj1jc5c7zkgqun9h.jpg)\n\n### 2nd place: Team BichdeHueDost — Reuniting to Solve Payments\n\n**Project:** SemiPay (RFID Cashless Payment for Schools)\n\nThe team name, BichdeHueDost, translates to \"Friends who have been set apart.\" It's a fitting name for a group of friends who went to different colleges but reunited to build this project. They tackled a unique problem: handling cash in schools for young children. Their solution used RFID cards backed by a blockchain ledger to ensure secure, cashless transactions for students.\n\n**How they used GitLab:** They utilized [GitLab CI/CD](https://about.gitlab.com/topics/ci-cd/) to automate the build process for their Flutter application (APK), ensuring that every commit resulted in a testable artifact. This allowed them to iterate quickly despite the \"flaky\" nature of cross-platform mobile development.\n\n![Team BichdeHueDost](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/pkukrjgx2miukb6nrj5g.jpg)\n\n### 3rd place: Team ZenYukti — Agentic Repository Intelligence\n\n**Project:** RepoInsight AI (AI-powered, GitLab-native intelligence platform)\n\nTeam ZenYukti impressed us with a solution that tackles a universal developer pain point: understanding unfamiliar codebases. What stood out to the judges was the tool's practical approach to onboarding and code comprehension: RepoInsight-AI automatically generates documentation, visualizes repository structure, and even helps identify bugs, all while maintaining context about the entire codebase.\n\n**How they used GitLab:** The team built a comprehensive CI/CD pipeline that showcased GitLab's security and DevOps capabilities. They integrated [GitLab's Security Templates](https://gitlab.com/gitlab-org/gitlab/-/tree/master/lib/gitlab/ci/templates/Security) (SAST, Dependency Scanning, and Secret Detection), and utilized [GitLab Container Registry](https://docs.gitlab.com/user/packages/container_registry/) to manage their Docker images for backend and frontend components. They created an AI auto-review bot that runs on merge requests, demonstrating an \"agentic workflow\" where AI assists in the development process itself.\n\n![Team ZenYukti](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380253/ymlzqoruv5al1secatba.jpg)\n\n## Beyond the code: A lesson in inclusion\n\nWhile the code was impressive, the most powerful moment of the event happened away from the keyboard.\n\nDuring the feedback session, we learned about the journey Team ZenYukti took to get to Mumbai. They traveled over 24 hours, covering nearly 1,800 kilometers. Because flights were too expensive and trains were booked, they traveled in the \"General Coach,\" a non-reserved, severely overcrowded carriage.\n\nAs one student described it:\n\n*\"You cannot even imagine something like this... there are no seats... people sit on the top of the train. This is what we have endured.\"*\n\nThis hit home. [Diversity, Inclusion, and Belonging](https://handbook.gitlab.com/handbook/company/culture/inclusion/) are core values at GitLab. We realized that for these students, the barrier to entry wasn't intellect or skill, it was access.\n\nIn that moment, we decided to break that barrier. We committed to reimbursing the travel expenses for the participants who struggled to get there. It's a small step, but it underlines a massive truth: **talent is distributed equally, but opportunity is not.**\n\n![hackathon class together](https://res.cloudinary.com/about-gitlab-com/image/upload/v1767380252/o5aqmboquz8ehusxvgom.jpg)\n\n### The future is bright (and automated)\n\nWe also saw incredible potential in teams like Prometheus, who attempted to build an autonomous patch remediation tool (DevGuardian), and Team Arrakis, who built a voice-first job portal for blue-collar workers using [GitLab Duo](https://about.gitlab.com/gitlab-duo-agent-platform/) to troubleshoot their pipelines.\n\nTo all the students who participated: You are the future. Through [GitLab for Education](https://about.gitlab.com/solutions/education/), we are committed to providing you with the top-tier tools (like GitLab Ultimate) you need to learn, collaborate, and change the world — whether you are coding from a dorm room, a lab, or a train carriage. **Keep shipping.**\n\n> :bulb: Learn more about the [GitLab for Education program](https://about.gitlab.com/solutions/education/).\n",{"slug":770,"featured":13,"template":14},"how-iit-bombay-students-code-future-with-gitlab",{"promotions":772},[773,787,798,810],{"id":774,"categories":775,"header":777,"text":778,"button":779,"image":784},"ai-modernization",[776],"ai-ml","Is AI achieving its promise at scale?","Quiz will take 5 minutes or less",{"text":780,"config":781},"Get your AI maturity score",{"href":782,"dataGaName":783,"dataGaLocation":246},"/assessments/ai-modernization-assessment/","modernization assessment",{"config":785},{"src":786},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138786/qix0m7kwnd8x2fh1zq49.png",{"id":788,"categories":789,"header":790,"text":778,"button":791,"image":795},"devops-modernization",[755,572],"Are you just managing tools or shipping innovation?",{"text":792,"config":793},"Get your DevOps maturity score",{"href":794,"dataGaName":783,"dataGaLocation":246},"/assessments/devops-modernization-assessment/",{"config":796},{"src":797},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138785/eg818fmakweyuznttgid.png",{"id":799,"categories":800,"header":802,"text":778,"button":803,"image":807},"security-modernization",[801],"security","Are you trading speed for security?",{"text":804,"config":805},"Get your security maturity score",{"href":806,"dataGaName":783,"dataGaLocation":246},"/assessments/security-modernization-assessment/",{"config":808},{"src":809},"https://res.cloudinary.com/about-gitlab-com/image/upload/v1772138786/p4pbqd9nnjejg5ds6mdk.png",{"id":811,"paths":812,"header":815,"text":816,"button":817,"image":822},"github-azure-migration",[813,814],"migration-from-azure-devops-to-gitlab","integrating-azure-devops-scm-and-gitlab","Is your team ready for GitHub's Azure move?","GitHub is already rebuilding around Azure. Find out what it means for you.",{"text":818,"config":819},"See how GitLab compares to GitHub",{"href":820,"dataGaName":821,"dataGaLocation":246},"/compare/gitlab-vs-github/github-azure-migration/","github azure migration",{"config":823},{"src":797},{"header":825,"blurb":826,"button":827,"secondaryButton":832},"Start building faster today","See what your team can do with the intelligent orchestration platform for DevSecOps.\n",{"text":828,"config":829},"Get your free trial",{"href":830,"dataGaName":53,"dataGaLocation":831},"https://gitlab.com/-/trial_registrations/new?glm_content=default-saas-trial&glm_source=about.gitlab.com/","feature",{"text":508,"config":833},{"href":57,"dataGaName":58,"dataGaLocation":831},1776442966840]