操作系统：CentOS Linux release 7.6.1810 (Core)
Redis版本：redis-6.2.4
- 机器地址：
| IP | Redis端口 | sentinel端口 |
|---|---|---|
| 192.168.174.7(master) | 6379 | 26379 |
| 192.168.174.8(slave-1) | 6379 | 26379 |
| 192.168.174.9(slave-2) | 6379 | 26379 |
- 配置主从
三个配置文件基本一样，不同之处如下：
Master :
# redis.conf
requirepass 123456
bind 192.168.174.7
Slave-1：
# redis.conf
bind 192.168.174.8
requirepass 123456
masterauth 123456
replica-read-only yes
replica-priority 100
replicaof 192.168.174.7 6379
Slave-2：
# redis.conf
bind 192.168.174.9
requirepass 123456
masterauth 123456
replica-read-only yes
replica-priority 100
replicaof 192.168.174.7 6379
查看master的info信息：
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.174.8,port=6379,state=online,offset=308,lag=0
slave1:ip=192.168.174.9,port=6379,state=online,offset=308,lag=0
master_failover_state:no-failover
master_replid:0ee0e53ee92953e79cbf6e00ef96c49d2f5e9fa8
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:308
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:308
- 哨兵模式
Master 配置文件
port 26379
daemonize no
pidfile /var/run/redis-sentinel.pid
logfile "/application/redis-6.2.4/log/redis-sentinel.log"
dir /tmp
sentinel monitor mymaster 192.168.174.7 6379 2
sentinel auth-pass mymaster 123456
sentinel down-after-milliseconds mymaster 30000
acllog-max-len 128
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes
SENTINEL resolve-hostnames no
SENTINEL announce-hostnames no
参数解释：
sentinel monitor <master-name> <ip> <port> <quorum>：
master-name：监控的名字（任意）
ip port：master节点ip端口，不需要配置从节点信息
quorum：代表要判定主节点最终不可达所需要的票数
sentinel down-after-milliseconds <master-name> <times>：
每个Sentinel节点都要通过定期发送ping命令来判断Redis数据节点和其余Sentinel节点是否可达，如果超过了down-after-milliseconds配置的时间且没有有效的回复，则判定节点不可达，<times>（单位为毫秒）
sentinel parallel-syncs <master-name> <nums>：
故障转移后每次向新的主节点发起复制操作的从节点个数
sentinel failover-timeout <master-name> <times>：
故障转移超时时间
sentinel auth-pass <master-name> <password>：
master节点的密码
sentinel notification-script <master-name> <script-path>：
在故障转移期间，当一些警告级别的Sentinel事件发生（指重要事件，例如-sdown：客观下线、-odown：主观下线）时，会触发对应路径的脚本，并向脚本发送相应的事件参数
sentinel client-reconfig-script <master-name> <script-path>：
在故障转移结束后，会触发对应路径的脚本，并向脚本发送故障转移结果的相关参数。和notification-script类似
Slave-01配置文件：
port 26379
daemonize no
pidfile /var/run/redis-sentinel.pid
logfile "/application/redis-6.2.4/log/redis-sentinel.log"
dir /tmp
sentinel monitor mymaster 192.168.174.7 6379 2
sentinel auth-pass mymaster 123456
sentinel down-after-milliseconds mymaster 30000
acllog-max-len 128
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes
SENTINEL resolve-hostnames no
SENTINEL announce-hostnames no
Slave-02配置文件：
port 26379
daemonize no
pidfile /var/run/redis-sentinel.pid
logfile "/application/redis-6.2.4/log/redis-sentinel.log"
dir /tmp
sentinel monitor mymaster 192.168.174.7 6379 2
sentinel auth-pass mymaster 123456
sentinel down-after-milliseconds mymaster 30000
acllog-max-len 128
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes
SENTINEL resolve-hostnames no
SENTINEL announce-hostnames no
启动命令：
# 依次启动
./src/redis-sentinel ./sentinel.conf
注意：当master下线后，在上线时注意配置文件主从配置已重置，需要重新配置。