dokku-ansible-playbook

Run ansible playbooks during deployment.

This plugin can be useful when you need to provision your server before or after a deployment of your application (or on any hook, just raise an issue and let's add it) and you prefer to use Ansible instead of Bash. For example, you make use of the ansible-dokku roles.

Requirements

• dokku 0.19.13+
• Debian based system (uses apt package manager for installing dependencies)

Installation

$ dokku plugin:install https://github.com/decentral1se/dokku-ansible-playbook.git
$ dokku plugin:install-dependencies

Usage

All files must be placed within the ansible folder of your git repository. Everything is copied into $DOKKU_LIB_ROOT/data/ansible/$APP on the post-extract hook. Dokku will make sure that your Ansible plays are run on the right hook against the Dokku server localhost.

• requirements.yml: what role dependencies to download before running your plays.
• pre-deploy.yml: play run before a deployment
• post-deploy.yml: play run after a deployment

Passwords

You can place a ansible/.vault.sh script that produces your [Ansible Vault](https://docs.ansible.com/ansible/latest/user_guide/vault.html password. This file will be copied over to $DOKKU_LIB_ROOT/data/ansible/$APP and locked down with the correct read-only permissions for the Dokku user account. This will then be used as the Ansible Vault password file which can be used to decrypt secrets.

Don't forget to chmod +x it and also add this file to your .gitignore, you've been warned!

Here's an example ansible/.vault.sh file.

#!/bin/bash

set -eu -o pipefail

echo "my-cool-vault-password"

So, if you then encrypt a secret:

$ ansible-vault \
  encrypt_string \
  --vault-password-file ansible/.vault.sh \
  --name mysecretname \
  mysecretvalue

You can place this output in your plays and it can be successfully decrypted on the remote Dokku host.

Permissions

Since the dokku user account runs the plays on the host, you will need to deal with sudo permissions when you want to use become: true to run a privilege escalation to the root account. In order to do this, you'll need to 1) run passwd dokku as the root user and set an account password and 2) add the dokku user account to the sudoers group (usermod -aG sudo dokku).

Example

ansible/requirements.yml

---
- src: dokku_bot.ansible_dokku
  version: v2020.3.15

ansible/pre-deploy.yml

---
- hosts: all
  tasks:
    - name: Configure the foobar environment
      dokku_config:
        app: foobar
        restart: false
        config:
          FOO: BAR
      become: true
      become_user: dokku