multiwebheads/docker-compose.yml at main · alexpott/multiwebheads · GitHub

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name: drupal-cluster

networks:
  frontend:
  backend:
  # Fixed subnet so web heads can reach the NFS server by a stable IP
  nfs-net:
    driver: bridge
    ipam:
      config:
        - subnet: 172.28.0.0/24

volumes:
  nfs-export:   # Backing storage inside the NFS server container
  mysql-data:

services:

  # ── NFS server ─────────────────────────────────────────────────────────────
  nfs:
    image: erichough/nfs-server:latest
    networks:
      nfs-net:
        ipv4_address: 172.28.0.2
    privileged: true
    volumes:
      - nfs-export:/exports/files
    environment:
      NFS_EXPORT_0: /exports/files *(rw,fsid=0,sync,no_subtree_check,no_root_squash)
    healthcheck:
      test: ["CMD-SHELL", "showmount -e localhost | grep -q /exports/files"]
      interval: 10s
      timeout: 5s
      retries: 10
      start_period: 15s

  # ── Web heads ──────────────────────────────────────────────────────────────
  # YAML anchor — web2/3/4 inherit every key from web1
  web1: &web
    build: ./docker/web
    networks:
      - frontend
      - backend
      - nfs-net
    volumes:
      - ${HOST_DRUPAL_PATH}:/var/www/html
      - ./docker/sites:/var/www/html/sites
      - ${HOST_DRUPAL_PATH}/sites/development.services.yml:/var/www/html/sites/development.services.yml
      - ${HOST_DRUPAL_PATH}/sites/default/default.settings.php:/var/www/html/sites/default/default.settings.php
      - ${HOST_DRUPAL_PATH}/sites/default/default.services.yml:/var/www/html/sites/default/default.services.yml
      - ./docker/web/drush.yml:/var/www/html/drush/drush.yml
    environment:
      NFS_SERVER: 172.28.0.2
      NFS_EXPORT: /
      MYSQL_HOST: db
      MYSQL_DATABASE: drupal
      MYSQL_USER: drupal
      MYSQL_PASSWORD: drupal
    cap_add:
      - SYS_ADMIN
    depends_on:
      nfs:
        condition: service_healthy
      db:
        condition: service_healthy
    restart: unless-stopped

  web2:
    <<: *web

  web3:
    <<: *web

  web4:
    <<: *web

  # ── Load balancer ──────────────────────────────────────────────────────────
  lb:
    image: haproxy:3.0
    networks:
      - frontend
    ports:
      - "8081:80"
    volumes:
      - ./docker/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
    depends_on:
      - web1
      - web2
      - web3
      - web4
    restart: unless-stopped

  # ── Database ───────────────────────────────────────────────────────────────
  db:
    image: mysql:9.2
    networks:
      - backend
    volumes:
      - mysql-data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: rootpassword
      MYSQL_DATABASE: drupal
      MYSQL_USER: drupal
      MYSQL_PASSWORD: drupal
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-prootpassword"]
      interval: 10s
      timeout: 5s
      retries: 10
      start_period: 30s
    restart: unless-stopped