文件存放如下图：

docker-compose.yml文件内容如下：

version: '3.3'
services:
  master:
    image: redis:3.2.12
    restart: always
    container_name: redis-master
    command: redis-server /usr/local/redis/conf/redis.conf
    ports:
      - 6380:6380
    volumes:
      - /root/redis/master/data:/data
      - /root/redis/master/conf:/usr/local/redis/conf
  slave1:
    image: redis:3.2.12
    restart: always
    container_name: redis-slave-1
    command: redis-server /usr/local/redis/conf/redis.conf
    ports:
      - 6381:6381
    volumes:
      - /root/redis/slave1/data:/data
      - /root/redis/slave1/conf:/usr/local/redis/conf
  slave2:
    image: redis:3.2.12
    restart: always
    container_name: redis-slave-2
    command: redis-server /usr/local/redis/conf/redis.conf
    ports:
      - 6382:6382
    volumes:
      - /root/redis/slave2/data:/data
      - /root/redis/slave2/conf:/usr/local/redis/conf
  sentinel1:
    image: redis:3.2.12
    container_name: redis-sentinel-1
    ports:
      - 26380:26380
    volumes:
      - /root/redis/sentinel1/conf:/usr/local/redis/sentinel1/conf
    command: redis-sentinel /usr/local/redis/sentinel1/conf/sentinel.conf
  sentinel2:
    image: redis:3.2.12
    container_name: redis-sentinel-2
    ports:
      - 26381:26381
    volumes:
      - /root/redis/sentinel2/conf:/usr/local/redis/sentinel2/conf
    command: redis-sentinel /usr/local/redis/sentinel2/conf/sentinel.conf
  sentinel3:
    image: redis:3.2.12
    container_name: redis-sentinel-3
    ports:
      - 26382:26382
    volumes:
      - /root/redis/sentinel3/conf:/usr/local/redis/sentinel3/conf
    command: redis-sentinel /usr/local/redis/sentinel3/conf/sentinel.conf

redis.conf配置文件修改内容：

# 配置端口根据实际情况更改
1.配置端口：
port 6379

2.修改绑定ip为服务器内网ip地址，做绑定，三台各自填写各自的ip地址
bind 0.0.0.0

2.保护模式修改为否，允许远程连接
protected-mode no

3.设定密码
requirepass "XXXX"

4.设定主库密码与当前库密码同步，保证从库能够提升为主库
masterauth "XXXX"

5.打开AOF持久化支持
appendonly yes

6.守护进程
daemonize no

sentinel.conf做如下修改：

bind 0.0.0.0
# 端口根据实际情况更改
port 26379
# 根据实际修改
dir "/tmp"
# 根据实际情况写主redis服务
sentinel monitor mymaster 192.168.123.182 6380 2
# 3秒连不上，就换主redis服务，生产环境时间可以久点
sentinel down-after-milliseconds mymaster 3000
# redis设置了密码，这个得加上
sentinel auth-pass mymaster 123456p

当停止redis-master容器，主redis服务会转移，重启redis-master后，redis-master变成从redis服务。