Docker-compose搭建Redis集群(Sentinel)的实现

# 哨兵sentinel实例运行的端口 默认26379  
port 26379  
sentinel monitor mymaster redis-master 6379 3
# 指定多少毫秒之后 主节点没有应答哨兵sentinel 此时 哨兵主观上认为主节点下线 默认30秒
sentinel down-after-milliseconds mymaster 5000
# 指定了在发生failover主备切换时最多可以有多少个slave同时对新的master进行同步,这个数字越小，完成failover所需的时间就越长
sentinel parallel-syncs mymaster 1
# 故障转移的超时时间
sentinel failover-timeout mymaster 5000

# 同步配置文件,启动哨兵
sed -i "s/$SENTINEL_QUORUM/$SENTINEL_QUORUM/g" /etc/redis/sentinel.conf
sed -i "s/$SENTINEL_DOWN_AFTER/$SENTINEL_DOWN_AFTER/g" /etc/redis/sentinel.conf
sed -i "s/$SENTINEL_FAILOVER/$SENTINEL_FAILOVER/g" /etc/redis/sentinel.conf
exec docker-entrypoint.sh redis-server /etc/redis/sentinel.conf --sentinel

# 建立Dockerfile指定基础镜像，同时拷贝配置文件到镜像内部
FROM redis
EXPOSE 26379
ADD sentinel.conf /etc/redis/sentinel.conf
RUN chown redis:redis /etc/redis/sentinel.conf
COPY sentinel-entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/sentinel-entrypoint.sh
ENTRYPOINT ["sentinel-entrypoint.sh"]

# 搭建几个从库,就需要在services中配置几个信息，开放相应端口
version: '2'
networks:
  app-tier:
    driver: bridge
services:
  redis:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=master
      - REDIS_PASSWORD=""
    networks:
      - app-tier
    ports:
      - '6380:6379'
  redis-slave:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=slave
      - REDIS_MASTER_HOST=redis
      - REDIS_MASTER_PASSWORD=""
      - REDIS_PASSWORD=""
    ports:
      - '6381:6379'
    depends_on:
      - redis
    networks:
      - app-tier
  redis-slave2:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=slave
      - REDIS_MASTER_HOST=redis
      - REDIS_MASTER_PASSWORD=""
      - REDIS_PASSWORD=""
    ports:
      - '6382:6379'
    depends_on:
      - redis
    networks:
      - app-tier
  redis-slave3:
    image: 'bitnami/redis:latest'
    environment:
      - REDIS_REPLICATION_MODE=slave
      - REDIS_MASTER_HOST=redis
      - REDIS_MASTER_PASSWORD=""
      - REDIS_PASSWORD=""
    ports:
      - '6383:6379'
    depends_on:
      - redis
    networks:
      - app-tier  
  redis-sentinel:
    image: 'bitnami/redis-sentinel:latest'
    environment:
      - REDIS_MASTER_PASSWORD=""
    depends_on:
      - redis
      - redis-slave
      - redis-slave2
      - redis-slave3
    ports:
      - '26379-26382:26379'
    networks:
      - app-tier

redis-sentinel                        # 项目根路径
    ├── docker-compose.yml            # docker-compose文件
    └── sentinel                      # 存放初始化sentinel容器的相关文件
        ├── Dockerfile                # sentinel构建镜像文件
        ├── sentinel.conf             # sentinel配置文件
        └── sentinel-entrypoint.sh    # sentinel.sh启动脚本

# 在后面加 -d 为在后台启动 
# compose启动失败可以尝试手动启动Containers
docker-compose up --scale redis-sentinel=4

# Kill掉主库容器进程，模拟宕机
docker kill Containerid