前面章节介绍了 Redis 哨兵模式，但该哨兵模式只有一个哨兵，如果该哨兵宕掉，当 Master 出现问题时，也不能进行故障转移。下面将介绍怎样启动多个哨兵，及时宕掉一个哨兵，依然能够实现 Master 故障转移。如下图：
从上图可知，我们加入了三个哨兵（Sentinel），每个哨兵都分别对 Master 和 Slave 进行监听，并且哨兵之间还会互相监测和通信。
注意：在配置多哨兵模式之前，需要提前配置好 Master-Slave 主从复制模式，如不知道怎样配置，请参考“Redis 主从复制”。
下面介绍的 Redis 多哨兵模式总共需要启动 6 个 Redis 服务，其中三个为 Redis 服务，另外三个为哨兵服务，如下：
Master 127.0.0.1:6379
Slave1 127.0.0.1:6378
Slave2 127.0.0.1:6377
Sentinel1 127.0.0.1:26379
Sentinel2 127.0.0.1:26378
Sentinel3 127.0.0.1:26377Redis 多哨兵模式配置目录如下图：
其中，start-redis-6377.bat（start-redis-6378.bat 和 start-redis-6379.bat 类似）脚本内容如下：
@echo off
title redis5-slave2-6377
cd %~dp0\redis5-slave2-6377
redis-server.exe redis.windows.conf
cd %~dp0
pausestart-redis-sentinel-26377.bat（start-redis-sentinel-26378.bat 和 start-redis-sentinel-26379.bat 也类似）脚本内容如下：
@echo off
title sentinel-26377
cd %~dp0\redis5-sentinel-26377
redis-server.exe sentinel.conf --sentinel
cd %~dp0
pause下面介绍怎样去配置多个哨兵，配置前需要注意如下几点：
（1）每个哨兵需要使用 sentinel myid 定义唯一的 id
（2）每个哨兵需要使用 port 定义不同的端口
除了上面两点外，其他配置和单哨兵一致，主要需要配置 sentinel monitor、sentinel down-after-milliseconds 等。
下面是哨兵1的部分配置内容：
protected-mode no
port 26379
# 设置哨兵唯一ID
sentinel myid 19e18f6594d97e540e075ca27bd73708911ad101
# Sentinel去监视一个名为 mymaster 的主 redis 实例
# 这个主实例的 IP 地址为 127.0.0.1，端口号为6379
# 而将这个主实例判断为失效至少需要 2 个 Sentinel 进程的同意
# 只要同意 Sentinel 的数量不达标，自动 failover 就不会执行
sentinel monitor mymaster 127.0.0.1 6379 2
# 指定了 Sentinel 认为 Redis 实例已经失效所需的毫秒数
# 当实例超过该时间没有返回 PING，或者直接返回错误
# 那么 Sentinel 将这个实例标记为主观下线。
# 只有一个 Sentinel 进程将实例标记为主观下线并不一定会引起实例的自动故障迁移
# 只有在足够数量的 Sentinel 都将一个实例标记为主观下线之后
# 实例才会被标记为客观下线，这时自动故障迁移才会执行
sentinel down-after-milliseconds mymaster 5000
# 设置连接 master 和 slave 时的密码，注意 sentinel 不能分别为 master
# 和 slave 设置不同的密码，因此 master 和 slave 的密码应该设置相同
sentinel auth-pass mymaster aaaaaa
# 指定了在执行故障转移时，最多可以有多少个从 Redis 实例在同步新的主实例
# 在 Redis 从（Slave）实例较多的情况下这个数字越小，同步的时间越长，完成故障转移所需的时间就越长
sentinel config-epoch mymaster 5哨兵2的配置文件内容如下：
protected-mode no
port 26378
# 设置哨兵唯一ID
sentinel myid 19e18f6594d97e540e075ca27bd73708911ad102
sentinel monitor mymaster 127.0.0.1 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel auth-pass mymaster aaaaaa
sentinel config-epoch mymaster 5哨兵3的配置文件内容如下：
protected-mode no
port 26377
# 设置哨兵唯一ID
sentinel myid 19e18f6594d97e540e075ca27bd73708911ad103
sentinel monitor mymaster 127.0.0.1 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel auth-pass mymaster aaaaaa
sentinel config-epoch mymaster 5分别通过 redis-server.exe sentinel.conf --sentinel 命令去启动哨兵，启动日志如下：
D:\redis5\redis5-sentinel-26379> redis-server.exe sentinel.conf --sentinel
[45316] 10 Apr 12:42:28.886 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
[45316] 10 Apr 12:42:28.886 # Redis version=5.0.14.1, bits=64, commit=ec77f72d, modified=0, pid=45316, just started
[45316] 10 Apr 12:42:28.886 # Configuration loaded
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 5.0.14.1 (ec77f72d/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in sentinel mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 26379
| `-._ `._ / _.-' | PID: 45316
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[45316] 10 Apr 12:42:28.891 # Sentinel ID is 19e18f6594d97e540e075ca27bd73708911ad101
[45316] 10 Apr 12:42:28.891 # +monitor master mymaster 127.0.0.1 6379 quorum 2
[45316] 10 Apr 12:42:29.832 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:42:29.834 * +slave slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379D:\redis5\redis5-sentinel-26378> redis-server.exe sentinel.conf --sentinel
[14524] 10 Apr 12:42:46.902 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
[14524] 10 Apr 12:42:46.902 # Redis version=5.0.14.1, bits=64, commit=ec77f72d, modified=0, pid=14524, just started
[14524] 10 Apr 12:42:46.902 # Configuration loaded
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 5.0.14.1 (ec77f72d/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in sentinel mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 26378
| `-._ `._ / _.-' | PID: 14524
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[14524] 10 Apr 12:42:46.907 # Sentinel ID is 19e18f6594d97e540e075ca27bd73708911ad102
[14524] 10 Apr 12:42:46.907 # +monitor master mymaster 127.0.0.1 6379 quorum 2
[14524] 10 Apr 12:42:47.847 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[14524] 10 Apr 12:42:47.848 * +slave slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[14524] 10 Apr 12:42:48.167 * +sentinel sentinel 19e18f6594d97e540e075ca27bd73708911ad101 127.0.0.1 26379 @ mymaster 127.0.0.1 6379D:\redis5\redis5-sentinel-26377> redis-server.exe sentinel.conf --sentinel
[55580] 10 Apr 12:43:01.259 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
[55580] 10 Apr 12:43:01.260 # Redis version=5.0.14.1, bits=64, commit=ec77f72d, modified=0, pid=55580, just started
[55580] 10 Apr 12:43:01.260 # Configuration loaded
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 5.0.14.1 (ec77f72d/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in sentinel mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 26377
| `-._ `._ / _.-' | PID: 55580
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[55580] 10 Apr 12:43:01.265 # Sentinel ID is 19e18f6594d97e540e075ca27bd73708911ad103
[55580] 10 Apr 12:43:01.265 # +monitor master mymaster 127.0.0.1 6379 quorum 2
[55580] 10 Apr 12:43:02.195 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[55580] 10 Apr 12:43:02.196 * +slave slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[55580] 10 Apr 12:43:02.278 * +sentinel sentinel 19e18f6594d97e540e075ca27bd73708911ad102 127.0.0.1 26378 @ mymaster 127.0.0.1 6379
[55580] 10 Apr 12:43:02.341 * +sentinel sentinel 19e18f6594d97e540e075ca27bd73708911ad101 127.0.0.1 26379 @ mymaster 127.0.0.1 6379从上面日志可以得知，哨兵3中监听了一个 master，两个 slave，和两个 sentinel。
（1）先查看当前主从复制信息，如下：
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=127.0.0.1,port=6378,state=online,offset=48785,lag=1
slave1:ip=127.0.0.1,port=6377,state=online,offset=48785,lag=1
master_replid:9bbd7de80825d3a703b61dfc8409fa7ff8dc264b
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:48918
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:48918从上可知，6379 为 Master，6378 和 6377 为 Slave。
（2）停掉 Master 服务。
（3）观察哨兵服务删除日志，如下：
# 哨兵1
[45316] 10 Apr 12:48:57.502 # +elected-leader master mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:57.502 # +failover-state-select-slave master mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:57.581 # +selected-slave slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:57.581 * +failover-state-send-slaveof-noone slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:57.674 * +failover-state-wait-promotion slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:58.474 # +promoted-slave slave 127.0.0.1:6377 127.0.0.1 6377 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:58.474 # +failover-state-reconf-slaves master mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:58.548 * +slave-reconf-sent slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:59.485 * +slave-reconf-inprog slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:59.485 * +slave-reconf-done slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:59.561 # -odown master mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:59.561 # +failover-end master mymaster 127.0.0.1 6379
[45316] 10 Apr 12:48:59.562 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6377
[45316] 10 Apr 12:48:59.563 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6377
[45316] 10 Apr 12:48:59.565 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377
[45316] 10 Apr 12:49:04.635 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377
# 哨兵2
[14524] 10 Apr 12:48:57.344 # +sdown master mymaster 127.0.0.1 6379
[14524] 10 Apr 12:48:57.428 # +new-epoch 6
[14524] 10 Apr 12:48:57.429 # +vote-for-leader 19e18f6594d97e540e075ca27bd73708911ad101 6
[14524] 10 Apr 12:48:57.430 # +odown master mymaster 127.0.0.1 6379 #quorum 2/2
[14524] 10 Apr 12:48:57.430 # Next failover delay: I will not start a failover before Mon Apr 10 12:54:57 2023
[14524] 10 Apr 12:48:58.548 # +config-update-from sentinel 19e18f6594d97e540e075ca27bd73708911ad101 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
[14524] 10 Apr 12:48:58.549 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6377
[14524] 10 Apr 12:48:58.553 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6377
[14524] 10 Apr 12:48:58.555 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377
[14524] 10 Apr 12:49:03.575 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377
# 哨兵3
[55580] 10 Apr 12:48:57.328 # +sdown master mymaster 127.0.0.1 6379
[55580] 10 Apr 12:48:57.428 # +new-epoch 6
[55580] 10 Apr 12:48:57.430 # +vote-for-leader 19e18f6594d97e540e075ca27bd73708911ad101 6
[55580] 10 Apr 12:48:58.440 # +odown master mymaster 127.0.0.1 6379 #quorum 3/2
[55580] 10 Apr 12:48:58.440 # Next failover delay: I will not start a failover before Mon Apr 10 12:54:57 2023
[55580] 10 Apr 12:48:58.548 # +config-update-from sentinel 19e18f6594d97e540e075ca27bd73708911ad101 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
[55580] 10 Apr 12:48:58.548 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6377
[55580] 10 Apr 12:48:58.550 * +slave slave 127.0.0.1:6378 127.0.0.1 6378 @ mymaster 127.0.0.1 6377
[55580] 10 Apr 12:48:58.553 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377
[55580] 10 Apr 12:49:03.559 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6377（4）继续使用 info replication 命令查看主从复制信息，如下：
C:\Users\Administrator> redis-cli -p 6377
127.0.0.1:6377> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=127.0.0.1,port=6378,state=online,offset=94189,lag=1
master_replid:c8421a0d848b549f4902e6258a30933c5cb51a67
master_replid2:9bbd7de80825d3a703b61dfc8409fa7ff8dc264b
master_repl_offset:94455
second_repl_offset:71816
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:94455从上面日志可知，127.0.0.1:6377 为新选举的 Master，127.0.0.1:6378 为 Slave（有且只有一个 Slave）。
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