2018-12-05 23:21:45 +05:30
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# Review apps
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2018-12-13 13:39:08 +05:30
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Review Apps are automatically deployed by each pipeline, both in
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[CE](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22010) and
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[EE](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6665).
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2018-12-05 23:21:45 +05:30
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## How does it work?
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2018-12-13 13:39:08 +05:30
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1. On every [pipeline][gitlab-pipeline] during the `test` stage, the
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[`review` job][review-job] is automatically started.
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2018-12-05 23:21:45 +05:30
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1. The `review` job [triggers a pipeline][cng-pipeline] in the
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[`CNG-mirror`][cng-mirror] [^1] project
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1. The `CNG-mirror` pipeline creates the Docker images of each component (e.g. `gitlab-rails-ee`,
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`gitlab-shell`, `gitaly` etc.) based on the commit from the
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[GitLab pipeline][gitlab-pipeline] and store them in its
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[registry][cng-mirror-registry]
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1. Once all images are built, the review app is deployed using
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[the official GitLab Helm chart][helm-chart] [^2] to the
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[`review-apps-ee` Kubernetes cluster on GCP][review-apps-ee]
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- The actual scripts used to deploy the review app can be found at
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[`scripts/review_apps/review-apps.sh`][review-apps.sh]
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- These scripts are basically
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[our official Auto DevOps scripts][Auto-DevOps.gitlab-ci.yml] where the
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default CNG images are overriden with the images built and stored in the
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[`CNG-mirror` project's registry][cng-mirror-registry]
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1. Once the `review` job succeeds, you should be able to use your review app
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thanks to the direct link to it from the MR widget. The default username is
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`root` and its password can be found in the 1Password secure note named
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**gitlab-{ce,ee} review app's root password**.
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**Additional notes:**
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- The Kubernetes cluster is connected to the `gitlab-ee` project using [GitLab's
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Kubernetes integration][gitlab-k8s-integration]. This basically allows to have
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a link to the review app directly from the merge request widget.
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- The manual `stop_review` in the `post-cleanup` stage can be used to stop a
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review app manually, and is also started by GitLab once a branch is deleted
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- [TBD] Review apps are cleaned up regularly using a pipeline schedule that runs
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the [`scripts/review_apps/automated_cleanup.rb`][automated_cleanup.rb] script
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2018-12-13 13:39:08 +05:30
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- If you're unable to log in using the `root` username and password, the
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deployment may have failed. Stop the Review App via the `stop_review`
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manual job and then retry the `review` job to redeploy the Review App.
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2018-12-05 23:21:45 +05:30
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[^1]: We use the `CNG-mirror` project so that the `CNG`, (**C**loud **N**ative **G**itLab), project's registry is
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not overloaded with a lot of transient Docker images.
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[^2]: Since we're using [the official GitLab Helm chart][helm-chart], this means
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you get the a dedicated environment for your branch that's very close to what it
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would look in production
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## Frequently Asked Questions
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**Will it be too much to trigger CNG image builds on every test run? This could create thousands of unused docker images.**
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> We have to start somewhere and improve later. If we see this getting out of hand, we will revisit.
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**How big is the Kubernetes cluster?**
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> The cluster is currently setup with a single pool of preemptible
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nodes, with a minimum of 1 node and a maximum of 30 nodes.
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**What are the machine running on the cluster?**
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> We're currently using `n1-standard-4` (4 vCPUs, 15 GB memory) machines.
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**How do we secure this from abuse? Apps are open to the world so we need to find a way to limit it to only us.**
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> This won't work for forks. We will add a root password to 1password shared vault.
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[gitlab-pipeline]: https://gitlab.com/gitlab-org/gitlab-ee/pipelines/29302122
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[review-job]: https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/94294136
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[cng-mirror]: https://gitlab.com/gitlab-org/build/CNG-mirror
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[cng-pipeline]: https://gitlab.com/gitlab-org/build/CNG-mirror/pipelines/29307727
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[cng-mirror-registry]: https://gitlab.com/gitlab-org/build/CNG-mirror/container_registry
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[helm-chart]: https://gitlab.com/charts/gitlab/
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[review-apps-ee]: https://console.cloud.google.com/kubernetes/clusters/details/us-central1-b/review-apps-ee?project=gitlab-review-apps
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[review-apps.sh]: https://gitlab.com/gitlab-org/gitlab-ee/blob/master/scripts/review_apps/review-apps.sh
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[automated_cleanup.rb]: https://gitlab.com/gitlab-org/gitlab-ee/blob/master/scripts/review_apps/automated_cleanup.rb
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[Auto-DevOps.gitlab-ci.yml]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml
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[gitlab-k8s-integration]: https://docs.gitlab.com/ee/user/project/clusters/index.html
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---
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[Return to Testing documentation](index.md)
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