docker-compose.yml

version: '3.8'

services:
  redis-master:
    image: redis:7.0
    container_name: redis-master
    command: ["redis-server", "--appendonly", "yes", "--requirepass", "masterpassword"]
    ports:
      - "6380:6379"
    volumes:
      - redis-master-data:/data

  redis-replica:
    image: redis:7.0
    container_name: redis-replica
    command: ["redis-server", "--appendonly", "yes", "--replicaof", "redis-master", "6379", "--masterauth", "masterpassword"]
    depends_on:
      - redis-master
    ports:
      - "6381:6379"
    volumes:
      - redis-replica-data:/data

  sentinel:
    image: redis:7.0
    container_name: redis-sentinel
    command: ["redis-sentinel", "/etc/redis/sentinel.conf"]
    ports:
      - "26379:26379"
    volumes:
      - ./sentinel.conf:/etc/redis/sentinel.conf
    depends_on:
      - redis-master
      - redis-replica

volumes:
  redis-master-data:
  redis-replica-data:

# sentinel.conf
# You should create a `sentinel.conf` file in the same directory as this Docker Compose file with the following contents:

# sentinel monitor mymaster redis-master 6379 2
# sentinel auth-pass mymaster masterpassword
# sentinel down-after-milliseconds mymaster 5000
# sentinel failover-timeout mymaster 10000
# sentinel parallel-syncs mymaster 1