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Use per-project customized values.yaml file in auto devops .gitlab-ci.yml template

What does this MR do?

I want to share with you my solution for the issue #56961 (moved)

It allows to specify custom values.yaml file per project / group / environment, this would allow to create re-usable framework specific helm charts when using Auto Deploy.

I think it can answer to both options proposed by @DylanGriffith https://gitlab.com/gitlab-org/gitlab-ce/issues/56961#note_136191131

Here, a bit of documentation to explain what you can do...

Set additional Helm chart values in a CI variable

Go to your GitLab project's Settings > CI/CD, then expand the section called Environment variables.

You can set your additional Helm chart values in a CI variable, like this:

Variable Value
AUTO_DEPLOY_VALUES_YAML postgresql:
  enabled: true
  image:
    tag: $${POSTGRES_VERSION:-9.6}
  postgresqlUsername: $$POSTGRES_USER
  postgresqlPassword: $$POSTGRES_PASSWORD
  postgresqlDatabase: $$POSTGRES_DB

You are able to use other variables inside your variable definition (but you should escape them with $$).

Or for a specific environment (this takes precedence over the AUTO_DEPLOY_VALUES_YAML):

Variable Value
<ENVIRONMENT>_AUTO_DEPLOY_VALUES_YAML postgresql:
  enabled: true
  image:
    tag: 11
  postgresqlUsername: $$POSTGRES_USER
  postgresqlPassword: $$POSTGRES_PASSWORD
  postgresqlDatabase: $$POSTGRES_DB

Customize additional Helm chart values file path

By default, your additional Helm chart values can be stored (or will be generated if AUTO_DEPLOY_VALUES_YAML is present) in the chart/auto_deploy_values.yaml path of your project.

If for some reason you want to change it.

Go to your GitLab project's Settings > CI / CD, then expand the section called Environment variables, and add CI variable like this:

Variable Value
AUTO_DEPLOY_VALUES_PATH chart/auto_deploy_values.yaml

Or for a specific environment (this takes precedence over the AUTO_DEPLOY_VALUES_PATH):

Variable Value
<ENVIRONMENT>_AUTO_DEPLOY_VALUES_PATH chart/auto_deploy_values.yaml

Overwrite Helm chart default values file path

Set the CI variable AUTO_DEPLOY_VALUES_PATH with this value: chart/values.yaml.

Be careful, it'll overwrite the values.yaml file of your chart, so you need to provide all default values.

Go to your GitLab project's Settings > CI / CD, then expand the section called Environment variables.

And set the whole values.yaml content inside the AUTO_DEPLOY_VALUES_YAML CI variable.

Or <ENVIRONMENT>_AUTO_DEPLOY_VALUES_YAML for a specific environment.

This takes precedence over AUTO_DEPLOY_VALUES_YAML.

Add environment variables that are used as values by the Helm chart

Any variable prefixed with AUTO_DEPLOY_ENV_ will be used as values by the Helm chart.

Go to your GitLab project's Settings > CI / CD, then expand the section called Environment variables, and add CI variable like this:

Variable Value
AUTO_DEPLOY_ENV_<YOUR_KEY> your_value

Or for a specific environment (this takes precedence over the AUTO_DEPLOY_ENV_<YOUR_KEY>):

Variable Value
<ENVIRONMENT>_AUTO_DEPLOY_ENV_<YOUR_KEY> your_value

Create a CI Variable, ensuring the key is prefixed with AUTO_DEPLOY_ENV_

For example, you can create a variable with key AUTO_DEPLOY_ENV_POSTGRES_VERSION and/or a PRODUCTION_AUTO_DEPLOY_ENV_POSTGRES_VERSION key.

If you don't set the AUTO_DEPLOY_VALUES_YAML CI variable

In your Git repository, you can add a chart/auto_deploy_values_template.yaml file and add your additional values content, like this:

postgresql:
  enabled: true
  image:
    tag: 9.6
  postgresqlUsername: $POSTGRES_USER
  postgresqlPassword: $POSTGRES_PASSWORD
  postgresqlDatabase: $POSTGRES_DB

foo: ${BAR:-my_default_value}
Overwrite Helm chart template file path for customized values

By default, Auto Deploy will use the template file, for additional Helm chart values, stored in the chart/auto_deploy_values_template.yaml path of your project.

If for some reason you want to change it.

Go to your GitLab project's Settings > CI / CD, then expand the section called Environment variables, and add CI variable like this:

Variable Value
AUTO_DEPLOY_VALUES_TEMPLATE_PATH chart/auto_deploy_values_template.yaml

Or for a specific environment (this takes precedence over the AUTO_DEPLOY_VALUES_TEMPLATE_PATH):

Variable Value
<ENVIRONMENT>_AUTO_DEPLOY_VALUES_TEMPLATE_PATH chart/auto_deploy_values_template.yaml

What are the relevant issue numbers?

#56961 (moved)

Does this MR meet the acceptance criteria?

Edited by Tortue Torche

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