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https://github.com/dokku/gitlab-ci
A collection of gitlab-ci examples
https://github.com/dokku/gitlab-ci
ci-cd continuous-deployment deployment docker dokku gitlab-ci
Last synced: about 2 months ago
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A collection of gitlab-ci examples
- Host: GitHub
- URL: https://github.com/dokku/gitlab-ci
- Owner: dokku
- Created: 2020-12-30T08:44:55.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-05-13T02:51:15.000Z (over 1 year ago)
- Last Synced: 2024-05-22T19:34:19.658Z (4 months ago)
- Topics: ci-cd, continuous-deployment, deployment, docker, dokku, gitlab-ci
- Language: Shell
- Homepage:
- Size: 68.4 KB
- Stars: 31
- Watchers: 5
- Forks: 11
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# gitlab-ci
A collection of gitlab-ci examples
## Requirements
Please note that these workflows are compatible with `dokku >= 0.11.6`.
## Usage
All examples require a `SSH_PRIVATE_KEY` environment variable set for the Gitlab CI pipeline. This may be set via a "secret variable". See [this doc](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent) for instructions on creating a new ssh key. Be careful not to overwrite existing keys on the generating machine by using a new name.
### Adding a secret variable
Browse to the repository in question and visit the following path: `the Gitlab project > Settings > CI/CD.`
Click on `Secret variables > Expand` and fill in the blanks.
- Key: `SSH_PRIVATE_KEY`
- Value: paste in an SSH private key registered in Dokku:
-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----
- Environment scope: `production` (This make sure that `SSH_PRIVATE_KEY` is not available on merge requests or tests)
- Protected: Do not check this checkbox unless you know what you are doing
## Environment Variables
- `BRANCH`: (_optional_) The branch to deploy when pushing to Dokku. Useful when a [custom deploy branch](https://dokku.com/docs/deployment/methods/git/#changing-the-deploy-branch) is set on Dokku.
- default: `master`
- example value: `main`
- `CI_BRANCH_NAME`: (_optional_) The branch name that triggered the deploy. Automatically detected from `CI_COMMIT_REF_NAME`.
- example value: `develop`
- `CI_COMMIT`: (_optional_) The commit sha that will be pushed. Automatically detected from `CI_COMMIT_SHA`.
- example value: `0aa00d8dd7c971c121e3d1e471d0a35e1daf8abe`
- `COMMAND`: (_optional_) The command to run for the action.
- default: `deploy`
- valid values:
- `deploy`
- `review-apps:create`: Used to create a review app - via `dokku apps:clone` - based on the `appname` configured in the `git_remote_url`. If the review app already exists, this action will not recreate the app. In both cases, the current commit will be pushed to the review app.
- `review-apps:destroy`: Destroys an existing review app.
- `GIT_PUSH_FLAGS`: (_optional_) A string containing a set of flags to set on push. This may be used to enable force pushes, or trigger verbose log output from git.
- example value: `--force -vvv`
- `GIT_REMOTE_URL`: (**required**) The dokku app's git repository url in SSH format.
- example value: `ssh://[email protected]:22/appname`
- `REVIEW_APP_NAME`: (_optional_) The name of the review app to create or destroy. Computed as `review-$APPNAME-$BRANCH_NAME` if not specified, where:
```text
$APPNAME: The parsed app name from the `git_remote_url`
$BRANCH_NAME: The inflected git branch name
```
- example value: `review-appname`
- `SSH_HOST_KEY`: (_optional_) The results of running `ssh-keyscan -t rsa $HOST`. The github-action will otherwise generate this on the fly via `ssh-keyscan`.
- example value:
```text
# dokku.com:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.1
dokku.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCvS+lK38EEMdHGb...
```
- `SSH_PRIVATE_KEY`: (**required**) A private ssh key that has push access to the Dokku instance.
- tip: It is recommended to use [Encrypted Secrets](https://docs.github.com/en/free-pro-team@latest/actions/reference/encrypted-secrets) to store sensitive information such as SSH Keys.
- example value:
```text
-----BEGIN OPENSSH PRIVATE KEY-----
MIIEogIBAAKCAQEAjLdCs9kQkimyfOSa8IfXf4gmexWWv6o/IcjmfC6YD9LEC4He
qPPZtAKoonmd86k8jbrSbNZ/4OBelbYO0pmED90xyFRLlzLr/99ZcBtilQ33MNAh
...
SvhOFcCPizxFeuuJGYQhNlxVBWPj1Jl6ni6rBoHmbBhZCPCnhmenlBPVJcnUczyy
zrrvVLniH+UTjreQkhbFVqLPnL44+LIo30/oQJPISLxMYmZnuwudPN6O6ubyb8MK
-----END OPENSSH PRIVATE KEY-----
```
## Examples
All examples below are functionally complete and can be copy-pasted into a `.gitlab-ci.yml` file, with some minor caveats:
- The `GIT_REMOTE_URL` should be changed to match the server and app.
- An [Gitlab Variable](https://docs.gitlab.com/ee/ci/variables/README.html#create-a-custom-variable-in-the-ui) should be set on the Gitlab repository with the name `SSH_PRIVATE_KEY` containing the contents of a private ssh key that has been added to the Dokku installation via the `dokku ssh-keys:add` command.
- As pushing a git repository from a shallow clone does not work, all repository checkouts should use a `GIT_DEPTH` of `0`. All examples below have this option set correctly.
For simplicity, each example is standalone, but may be combined as necessary to create the desired effect.
- [Simple Example](/example-pipelines/simple.yml): Deploys a codebase on push or merge to master.
- [Build in CI and Deploy an image](/example-pipelines/build-and-deploy.yml): Builds a docker image in CI, pushes the image to the remote Docker Hub repository, and then notifies Dokku to deploy the built image.
- [Cancel previous runs on new push](/example-pipelines/cancel-previous-runs.yml): This pipeline is particularly useful when triggered by new pushes.
- [Avoid SSH Host Keyscan](/example-pipelines/specify-ssh-host-key.yml): By default, this action will scan the host for it's SSH host key and use that value directly. This may not be desirable for security compliance reasons.
The `SSH_HOST_KEY` value can be retrieved by calling `ssh-keyscan -t rsa $HOST`, where `$HOST` is the Dokku server's hostname.
- [Specify a custom deploy branch](/example-pipelines/custom-deploy-branch.yml): Certain Dokku installations may use custom deploy branches other than `master`. In the following example, we push to the `develop` branch.
- [Verbose Push Logging](/example-pipelines/verbose-logging.yml): Verbose client-side logging may be enabled with this method. Note that this does not enable trace mode on the deploy, and simply tells the `git` client to enable verbose log output
- [Force Pushing](/example-pipelines/force-push.yml): If the remote app has been previously pushed manually from a location other than CI, it may be necessary to enable force pushing to avoid git errors.
- [Review Apps](/example-pipelines/review-app.yml): Handles creation and deletion of review apps through use of `dokku apps:clone` and `dokku apps:destroy`. Review apps are a great way to allow folks to preview pull request changes before they get merged to production.
- Placing a shell script at `bin/ci-pre-deploy` can be used to reconfigure the app, as shown in [this example](/example-pipelines/review-app/ci-pre-deploy).