This is an Ansible Playbook to monitor a git repo for players to add (or remove) and then restart the relevant docker containers using `docker-compose`. I use this to manage the players on a minecraft server I run.

AAA_Docker Minecraft Server README.md

Docker Minecraft Server

This is an Ansible Playbook to monitor a git repo for players to add (or remove) and then restart the relevant docker containers using docker-compose. I use this to manage the players on a minecraft server I run.

In this repo, you'll find the actual ansible playbook (playbook.yml), the crontab-able run_playbook.sh (which silences unchanged plays) and the template I'm using (templates=docker-compose.yml). There is also an example vars file (host_vars=localhost=vars.yml) to show the basics of what this file would look like. Note that directory structures in gists are not permitted, so I've replaced / with = in each filename.

host_vars=localhost=vars.yml

default_players:
- notch

git_repos:
  players: https://example.com/user/players

servers:
- players: "{{ default_players + (example_players | default([])) }}"
  gamemode: creative
  difficulty: peaceful
  cheats: "true"
  name: Example

playbook.yml

---
- name: Run Playbook
  hosts: localhost
  tasks:
  - name: Run git pull
    register: git_pull
    ansible.builtin.git:
      repo: "{{ item.value }}"
      dest: "host_vars/localhost/{{ item.key }}/"
    loop: "{{ git_repos | dict2items }}"

  - name: Reload Vars
    when: git_pull.changed
    ansible.builtin.include_vars:
      dir: "host_vars/{{ inventory_hostname }}"
      ignore_unknown_extensions: yes

  - name: Template docker
    when: git_pull.changed or force | default(false)
    register: template
    template:
      src: templates/docker-compose.yml
      dest: /opt/docker/minecraft/docker-compose.yml

  - name: Restart docker containers
    when: template.changed or force | default(false)
    register: docker
    community.docker.docker_compose:
      project_src: /opt/docker/minecraft
      build: false

  - name: Document running containers
    debug:
      msg: |
        {
          {% for item in servers %}
            "{{ item.port|default(19132) }} - {{ item.name | default('default') }}": {
              "mode": "{{ item.gamemode | default('survival') }}",
              "difficulty": "{{ item.difficulty | default('easy') }}"{% if item.cheats | default('false') != 'false' %},
              "cheats": "allowed"{% endif %}
            },
          {% endfor %}
        }

run_playbook.sh

#!/bin/bash
cd "$(dirname "$0")"
outfile="/tmp/$(date +%Y%m%d)-ansible-minecraft.out"
ansible-playbook playbook.yml 2>&1 > "$outfile"
if grep -qE "(changed|failed|fail|fatal):" "$outfile"; then
  cat "$outfile"
fi

templates=docker-compose.yml

version: '3.4'

services:
{% for item in servers %}
  minecraft_{{ item.gamemode | default('survival') }}_{{ item.difficulty | default('easy') }}_{{ item.name | default('default') }}:
    image: itzg/minecraft-bedrock-server
    restart: always
    environment:
      EULA: "TRUE"
      GAMEMODE: {{ item.gamemode | default('survival') }}
      DIFFICULTY: {{ item.difficulty | default('easy') }}
      ALLOW_CHEATS: "{{ item.cheats | default('false') }}"
{% if item.seed | default('') | string | length > 0 %}      LEVEL_SEED: '{{ item.seed | default('') }}'
{% endif %}
      SERVER_NAME: "{{ item.server_name | default(ansible_fqdn) }}{% if item.name | default('') | length > 0 %} - {{ item.name }}{% endif %}"
      WHITE_LIST: "true"
      WHITE_LIST_USERS: {{ item.players | join(",") }}
      DEFAULT_PLAYER_PERMISSION_LEVEL: operator
    ports:
      - {{ item.port|default(19132) }}:19132/udp
    volumes:
      - ./data_{{ item.gamemode | default('survival') }}_{{ item.difficulty | default('easy') }}_{{ item.name | default('default') }}:/data
    stdin_open: true
    tty: true

{% endfor %}