A role to install and configure Atlantis.

• Docker and Docker Compose

• atlantis_docker_tag: The Docker tag that should be used (Optional).
• atlantis_server_port: Atlantis server port (Optional).
• atlantis_env_file: The name of the Atlantis environment template file (Optional). This file contains all environment variables for Atlantis and Terraform.

Some configurations are required by Atlantis to be passed using environment variables. Some of these required variables are ATLANTIS_ATLANTIS_URL and ATLANTIS_REPO_ALLOWLIST.

In addition, you also have to provide the configuration and credentails for your desired Git host. Please take a look at the documentation for further details:

• Git Host Access Credentials
• Webhook Secrets
• Configuring Webhooks

Last, configure the provider credentials so Atlantis can actually run Terraform commands.

An example of such an environment variable file could be:

ATLANTIS_ATLANTIS_URL={{ atlantis['url'] }}
ATLANTIS_REPO_ALLOWLIST={{ atlantis['allowed_repos'] }}
ATLANTIS_REPO_CONFIG_JSON={"repos":[{"id":"/.*/","apply_requirements":["approved","mergeable"],"allowed_overrides":["apply_requirements","workflow","delete_source_branch_on_merge"],"allow_custom_workflows":true,"delete_source_branch_on_merge":true}]}

ATLANTIS_GH_USER={{ atlantis['github']['user'] }}
ATLANTIS_GH_TOKEN={{ atlantis['github']['token'] }}
ATLANTIS_GH_WEBHOOK_SECRET={{ atlantis['github']['webhook_secret'] }}

DIGITALOCEAN_TOKEN={{ atlantis['digitalocean']['api_key'] }}
AWS_ACCESS_KEY_ID={{ atlantis['terraform']['aws']['access_key_id'] }}
AWS_SECRET_ACCESS_KEY={{ atlantis['terraform']['aws']['secret_access_key'] }}

The variables within the brackets are Ansible variables. You could store these secrets for example using Ansible Vault.

- hosts: all
  tasks:
    - ansible.builtin.include_role:
        name: ansible-atlantis
      vars:
        atlantis_docker_tag: v0.27.1
        atlantis_server_port: 4141
        atlantis_env_file: atlantis_env.j2

In order to have a verioning in place and working, create leightweight tags that point to the appropriate minor release versions.

Creating a new minor release:

git tag v2
git push --tags

Replacing an already existing minor release:

git tag -d v2
git push origin :refs/tags/v2
git tag v2
git push --tags