services:
  redis-master:
    image: redis:7-alpine

  redis-slave:
    image: redis:7-alpine
    command: redis-server --slaveof redis-master 6379
    depends_on:
      - redis-master

  redis-sentinel:
    image: redis:7-alpine
    depends_on:
      - redis-master
      - redis-slave
    ports:
      - "26379:26379"
    command: >
      sh -c 'echo "bind 0.0.0.0" > /etc/sentinel.conf &&
            echo "sentinel monitor mymaster redis-master 6379 2" >> /etc/sentinel.conf &&
            echo "sentinel resolve-hostnames yes" >> /etc/sentinel.conf &&
            echo "sentinel down-after-milliseconds mymaster 10000" >> /etc/sentinel.conf &&
            echo "sentinel failover-timeout mymaster 10000" >> /etc/sentinel.conf &&
            echo "sentinel parallel-syncs mymaster 1" >> /etc/sentinel.conf &&
            redis-sentinel /etc/sentinel.conf'