Sentinel(哨兵)是用于监控redis集群中Master状态的工具，其已经被集成在redis2.4+的版本中
一、Sentinel作用：
1)：Master状态检测
2)：如果Master异常，则会进行Master-Slave切换，将其中一个Slave作为Master，将之前的Master作为Slave
3)：Master-Slave切换后，master_redis.conf、slave_redis.conf和sentinel.conf的内容都会发生改变，即master_redis.conf中会多一行slaveof的配置，sentinel.conf的监控目标会随之调换。
二、Sentinel工作方式：
1)：每个Sentinel以每秒钟一次的频率向它所知的Master，Slave以及其他 Sentinel 实例发送一个PING命令
2)：如果一个实例（instance）距离最后一次有效回复 PING 命令的时间超过 down-after-milliseconds选项所指定的值，则这个实例会被Sentinel 标记为主观下线。
3)：如果一个Master被标记为主观下线，则正在监视这个Master的所有Sentinel要以每秒一次的频率确认Master的确进入了主观下线状态。
4)：当有足够数量的 Sentinel（大于等于配置文件指定的值）在指定的时间范围内确认Master的确进入了主观下线状态，则Master会被标记为客观下线
5)：在一般情况下，每个Sentinel会以每 10 秒一次的频率向它已知的所有Master，Slave发送INFO命令
6)：当Master被Sentinel标记为客观下线时，Sentinel向下线的Master的所有Slave发送INFO命令的频率会从10秒一次改为每秒一次
7)：若没有足够数量的Sentinel同意Master已经下线，Master的客观下线状态就会被移除。
若Master重新向Sentinel的PING命令返回有效回复，Master的主观下线状态就会被移除。
三、主观下线和客观下线
主观下线：Subjectively Down，简称SDOWN，指的是当前Sentinel实例对某个redis服务器做出的下线判断。
客观下线：Objectively Down，简称ODOWN，指的是多个Sentinel实例在对Master Server做出SDOWN判断，并且通过SENTINEL is-master-down-by-addr 命令互相交流之后，得出的Master Server下线判断，然后开启failover.
SDOWN适合于Master和Slave，只要一个Sentinel 发现Master进入了ODOWN， 这个Sentinel就可能会被其他Sentinel推选出， 并对下线的主服务器执行自动故障迁移操作。
ODOWN只适用于Master，对于Slave的Redis实例，Sentinel在将它们判断为下线前不需要进行协商，所以Slave的Sentinel永远不会达到ODOWN。
架构：
station11:192.168.1.11 redis master 6379 sentinel 26379
station12:192.168.1.12 redis slave1 6379 sentinel 26479
station13:192.168.1.13 redis slave2 6379 sentinel 26579
环境：Centos6.8 epel-6-ali.repo ansible
1、ansible安装3机redis
[root@station11 ~]# ansible all -m command -a "yum -y install gcc gcc-c++ tcl"
[root@station11 ~]# wget http://download.redis.io/releases/redis-3.2.6.tar.gz
[root@station11 ~]# ansible all -m copy -a 'src=/root/redis-3.2.6.tar.gz dest=/root/'
[root@station11 ~]# ansible all -m command -a 'tar -zxvf redis-3.2.6.tar.gz -C /usr/local'
[root@station11 ~]# ansible all -m file -a "src=/usr/local/redis-3.2.6 dest=/usr/local/redis state=link"
[root@station11 ~]# vim make.sh
#!/bin/bashcd /usr/local/redis
make && make install
[root@station11 ~]# chmod +x make.sh
[root@station11 ~]# ansible all -m copy -a "src=/root/make.sh dest=/root/ mode=0755"
[root@station11 ~]# ansible all -m shell -a "/root/make.sh"
[root@station11 ~]# ansible all -m command -a "mkdir /etc/redis"
[root@station11 ~]# ansible all -m command -a "mkdir -pv /data/redis/6379"
[root@station11 ~]# ansible all -m copy -a "src=/usr/local/redis/redis.conf dest=/etc/redis/"
2.1、修改主库配置文件
[root@station11 ~]# vim /etc/redis/redis.conf
daemonize yes 以守护进程模式运行bind 192.168.1.11 本机主库监听本机地址logfile "/var/log/redis_6379.log" 指定日志文件dir /data/redis/6379 指定rdb数据库存放目录masterauth redhat 启动主库验证requirepass redhat 启动用户进入密码验证
[root@station11 ~]# redis-server /etc/redis/redis.conf&
[root@station11 ~]# ss -nutlp | grep redis
tcp LISTEN 0 128 192.168.1.11:6379 *:* users:(("redis-server",6447,4))
2.2、为slave1提供redis配置文件
[root@station12 ~]# vim /etc/redis/redis.conf
bind 192.168.1.12 #绑定slave1的地址logfile "/var/log/redis_6379.log"dir /data/redis/6379slaveof 192.168.1.11 6379 #此选项是主从配置的关键，指向master的ip和redis端口slave-priority 95 #slave1服务器的优先级
[root@station12 ~]# nohup redis-server /etc/redis/redis.conf& 后台执行
[1] 2572
[root@station11 ~]# tail -f /var/log/redis_6379.log 主库日志
6447:M 22 Jan 23:49:34.809 * Slave 192.168.1.12:6379 asks for synchronization6447:M 22 Jan 23:49:34.809 * Full resync requested by slave 192.168.1.12:6379
[root@station12 ~]# tail -f /var/log/redis_6379.log 从库日志
7655:S 22 Jan 23:49:34.555 * Connecting to MASTER 192.168.1.11:63797655:S 22 Jan 23:49:34.555 * MASTER <-> SLAVE sync started
2.3、为slave2提供redis配置文件
[root@station12 ~]# scp /etc/redis/redis.conf 192.168.1.13:/etc/redis/
[root@station13 ~]# vim /etc/redis/redis.conf
bind 192.168.1.13slaveof 192.168.1.11 6379slave-priority 97
[root@station13 ~]# nohup redis-server /etc/redis/redis.conf&
[1] 5659
[root@station13 ~]# tail -f /var/log/redis_6379.log
5659:S 23 Jan 00:00:12.656 * Connecting to MASTER 192.168.1.11:63795659:S 23 Jan 00:00:12.656 * MASTER <-> SLAVE sync started
2.4、检查主从库复制正常？
[root@station11 ~]# redis-cli -h 192.168.1.11 -p 6379
192.168.1.11:6379> info replication# Replicationrole:masterconnected_slaves:2slave0:ip=192.168.1.12,port=6379,state=online,offset=1023,lag=1slave1:ip=192.168.1.13,port=6379,state=online,offset=1023,lag=1master_repl_offset:1023repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:1022192.168.1.11:6379> set 1 1000OK192.168.1.11:6379> keys *1) "1"192.168.1.11:6379> get 1"1000"
[root@station12 ~]# redis-cli -h 192.168.1.12 -p 6379
192.168.1.12:6379> keys *1) "1"192.168.1.12:6379> get 1"1000"
[root@station13 ~]# redis-cli -h 192.168.1.13 -p 6379
192.168.1.13:6379> get 1"1000"192.168.1.13:6379> keys *1) "1"
3.1、主库sentinel配置文件
[root@station11 ~]# cp /usr/local/redis/sentinel.conf /etc/redis/
[root@station11 ~]# vim /etc/redis/sentinel.conf
port 26379sentinel monitor mymaster 192.168.1.11 6379 1sentinel down-after-milliseconds mymaster 5000sentinel failover-timeout mymaster 60000logfile "/var/log/sentinel_master.log"protected-mode no 打开保护模式，否则sentinel不会监听除了127.0.0.1和192.168.1.1之外IP，也就不会超过1张投票给station11已经死，需要重新选举主服注意：192.168.1.12和192.168.1.13上的sentinel配置和192.168.1.11一样，只有端口和log不一样如下：slave1 192.168.1.12
[root@station11 ~]# ansible all -m copy -a "src=/etc/redis/sentinel.conf dest=/etc/redis/"
3.2、从库slave1的sentinel配置文件
[root@station12 ~]# vim /etc/redis/sentinel.conf
port 26479logfile "/var/log/sentinel_slave1.log"
3.3、从库slave1的sentinel配置文件
[root@station13 ~]# vim /etc/redis/sentinel.conf
port 26579logfile "/var/log/sentinel_slave2.log"
3.4、主从库sentinel连接时日志
[root@station11 ~]# nohup redis-sentinel /etc/redis/sentinel.conf&
[1] 6640
[root@station11 ~]# tail -f /var/log/sentinel_master.log
6640:X 23 Jan 00:22:34.910 # Sentinel ID is 17c9ee07632d60c4c0aa75a853bbda93966caa226640:X 23 Jan 00:22:34.910 # +monitor master mymaster 192.168.1.11 6379 quorum 16640:X 23 Jan 00:22:34.910 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 63796640:X 23 Jan 00:22:34.912 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 6379
[root@station12 ~]# nohup redis-sentinel /etc/redis/sentinel.conf&
[2] 7782
[root@station12 ~]# tail -f /var/log/sentinel_slave1.log
7782:X 23 Jan 00:24:36.059 # Sentinel ID is 7c000aa564ed603eeefd031333ebc2c916597ec67782:X 23 Jan 00:24:36.059 # +monitor master mymaster 192.168.1.11 6379 quorum 17782:X 23 Jan 00:24:36.060 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 63797782:X 23 Jan 00:24:36.061 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 63797782:X 23 Jan 00:24:36.516 * +sentinel sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 63797782:X 23 Jan 00:24:41.597 # +sdown sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 6379
[root@station13 ~]# nohup redis-sentinel /etc/redis/sentinel.conf&
[2] 5763
[root@station13 ~]# tail -f /var/log/sentinel_slave2.log
5763:X 23 Jan 00:26:14.286 # Sentinel ID is a78518e4955d3602c61e212be0cbdc378daa3cdc5763:X 23 Jan 00:26:14.286 # +monitor master mymaster 192.168.1.11 6379 quorum 15763:X 23 Jan 00:26:14.287 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 63795763:X 23 Jan 00:26:14.288 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 63795763:X 23 Jan 00:26:14.708 * +sentinel sentinel 7c000aa564ed603eeefd031333ebc2c916597ec6 192.168.1.12 26479 @ mymaster 192.168.1.11 63795763:X 23 Jan 00:26:15.779 * +sentinel sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 63795763:X 23 Jan 00:26:19.716 # +sdown sentinel 7c000aa564ed603eeefd031333ebc2c916597ec6 192.168.1.12 26479 @ mymaster 192.168.1.11 63795763:X 23 Jan 00:26:20.797 # +sdown sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 6379
3.5、客户端查看sentinel
[root@station11 ~]# redis-cli -p 26379
127.0.0.1:26379> info sentinel# Sentinelsentinel_masters:1sentinel_tilt:0sentinel_running_scripts:0sentinel_scripts_queue_length:0sentinel_simulate_failure_flags:0master0:name=mymaster,status=ok,address=192.168.1.11:6379,slaves=2,sentinels=3127.0.0.1:26379> sentinel masters1) 1) "name" 2) "mymaster" 3) "ip" 4) "192.168.1.11" 5) "port" 6) "6379" 7) "runid" 8) "e0ae553828b47db69e0d75ef8c20b30f1ed96c3c" 9) "flags" 10) "master" .....................................................127.0.0.1:26379> sentinel slaves mymaster1) 1) "name" 2) "192.168.1.12:6379" 3) "ip" 4) "192.168.1.12" 5) "port" 6) "6379" 7) "runid" 8) "486ebcb9ad89bf9c6889fd98b0d669c0addb9d10" 9) "flags" 10) "slave" .................................................... 31) "master-link-status" 32) "ok" 33) "master-host" 34) "192.168.1.11" 35) "master-port" 36) "6379" 37) "slave-priority" 38) "95" 39) "slave-repl-offset" 40) "75763"2) 1) "name" 2) "192.168.1.13:6379" 3) "ip" 4) "192.168.1.13" 5) "port" 6) "6379" 7) "runid" 8) "30fdcff948a6e249a87da41ef42f41897eaf4104" 9) "flags" 10) "slave" ................................................. 31) "master-link-status" 32) "ok" 33) "master-host" 34) "192.168.1.11" 35) "master-port" 36) "6379" 37) "slave-priority" 38) "97" 39) "slave-repl-offset" 40) "75763"
4、进行容灾测试：
4.1、模拟redis的HA集群slave服务器宕机
停掉一台slave，观察集群的状态，这里将slave2的redis-server停掉
[root@station13 ~]# killall redis-server
首先查看三台sentinel的日志信息，都会刷新一条，如下：
[root@station11 ~]# tail -f /var/log/sentinel_master.log
6640:X 23 Jan 00:33:05.032 # +sdown slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 6379
可以看到192.168.1.13掉了
到master服务器上查看主从复制信息:
192.168.1.11:6379> info replication# Replicationrole:masterconnected_slaves:1slave0:ip=192.168.1.12,port=6379,state=online,offset=131310,lag=0master_repl_offset:131310repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:131309
可以看到192.168.1.13已经被master剔除了!
再重新将slave2的redis-server启动起来，继续观察：
[root@station13 ~]# nohup redis-server /etc/redis/redis.conf&
三台sentinel的日志信息，如下：
[root@station11 ~]# tail -f /var/log/sentinel_master.log
6640:X 23 Jan 00:36:10.845 * +reboot slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 63796640:X 23 Jan 00:36:10.936 # -sdown slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 6379
可以看出192.168.1.13已经重新启动了！
在master上继续查看复制信息，如下：13主机又重回集群
192.168.1.11:6379> info replication# Replicationrole:masterconnected_slaves:2slave0:ip=192.168.1.12,port=6379,state=online,offset=162401,lag=1slave1:ip=192.168.1.13,port=6379,state=online,offset=162401,lag=1master_repl_offset:162401repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:162400
4.2、模拟redis的HA集群master服务器宕机
说明：停掉master的6379端口，假设master是因为外部问题宕机了（直接kill掉redis-server进程）
[root@station11 ~]# killall redis-server
观察三台redis的sentinel日志：
[root@station11 ~]#tail -f /var/log/sentinel_master.log
6640:X 23 Jan 00:39:07.305 # +sdown master mymaster 192.168.1.11 63796640:X 23 Jan 00:39:07.305 # +odown master mymaster 192.168.1.11 6379 #quorum 1/16640:X 23 Jan 00:39:07.305 # +new-epoch 16640:X 23 Jan 00:39:07.305 # +try-failover master mymaster 192.168.1.11 63796640:X 23 Jan 00:39:07.308 # +vote-for-leader 17c9ee07632d60c4c0aa75a853bbda93966caa22 16640:X 23 Jan 00:39:17.380 # -failover-abort-not-elected master mymaster 192.168.1.11 63796640:X 23 Jan 00:39:17.438 # Next failover delay: I will not start a failover before Mon Jan 23 00:41:07 20176640:X 23 Jan 00:41:07.432 # +new-epoch 26640:X 23 Jan 00:41:07.432 # +try-failover master mymaster 192.168.1.11 63796640:X 23 Jan 00:41:07.434 # +vote-for-leader 17c9ee07632d60c4c0aa75a853bbda93966caa22 26640:X 23 Jan 00:41:17.505 # -failover-abort-not-elected master mymaster 192.168.1.11 63796640:X 23 Jan 00:41:17.592 # Next failover delay: I will not start a failover before Mon Jan 23 00:43:07 2017
一直尝试恢复master失败，投票只有1票，重新选举出新主服数量不够
[root@station11 ~]#tail -f sentinel_master.log
6732:X 23 Jan 01:24:18.921 # +new-epoch 186732:X 23 Jan 01:24:18.933 # +vote-for-leader a78518e4955d3602c61e212be0cbdc378daa3cdc 186732:X 23 Jan 01:24:18.946 # +sdown master mymaster 192.168.1.11 63796732:X 23 Jan 01:24:18.946 # +odown master mymaster 192.168.1.11 6379 #quorum 1/16732:X 23 Jan 01:24:18.946 # Next failover delay: I will not start a failover before Mon Jan 23 01:26:19 20176732:X 23 Jan 01:24:19.240 # +config-update-from sentinel a78518e4955d3602c61e212be0cbdc378daa3cdc 192.168.1.13 26579 @ mymaster 192.168.1.11 63796732:X 23 Jan 01:24:19.240 # +switch-master mymaster 192.168.1.11 6379 192.168.1.12 6379 切换master从11到126732:X 23 Jan 01:24:19.241 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.12 63796732:X 23 Jan 01:24:19.241 * +slave slave 192.168.1.11:6379 192.168.1.11 6379 @ mymaster 192.168.1.12 63796732:X 23 Jan 01:24:24.258 # +sdown slave 192.168.1.11:6379 192.168.1.11 6379 @ mymaster 192.168.1.12 6379
[root@station11 ~]#tail -f /var/log/redis_slave1.log #slave1启动master模式
7846:M 23 Jan 01:24:18.857 * MASTER MODE enabled (user request from 'id=7 addr=192.168.1.13:44615 fd=10 name=sentinel-a78518e4-cmd age=183 idle=0 flags=x db=0 sub=0 psub=0 multi=3 qbuf=0 qbuf-free=32768 obl=36 oll=0 omem=0 events=r cmd=exec')7846:M 23 Jan 01:24:18.858 # CONFIG REWRITE executed with success.7846:M 23 Jan 01:24:19.060 * Slave 192.168.1.13:6379 asks for synchronization7846:M 23 Jan 01:24:19.061 * Full resync requested by slave 192.168.1.13:63797846:M 23 Jan 01:24:19.061 * Starting BGSAVE for SYNC with target: disk7846:M 23 Jan 01:24:19.061 * Background saving started by pid 78527852:C 23 Jan 01:24:19.091 * DB saved on disk7852:C 23 Jan 01:24:19.091 * RDB: 8 MB of memory used by copy-on-write7846:M 23 Jan 01:24:19.178 * Background saving terminated with success7846:M 23 Jan 01:24:19.178 * Synchronization with slave 192.168.1.13:6379 succeeded
[root@station12 ~]# redis-cli -h 192.168.1.12 -p 6379
192.168.1.12:6379> info replication# Replicationrole:masterconnected_slaves:1slave0:ip=192.168.1.13,port=6379,state=online,offset=65036,lag=0master_repl_offset:65036repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:65035
[root@station12 ~]# redis-cli -h 192.168.1.12 -p 26479
192.168.1.12:26479> info sentinel# Sentinelsentinel_masters:1sentinel_tilt:0sentinel_running_scripts:0sentinel_scripts_queue_length:0sentinel_simulate_failure_flags:0master0:name=mymaster,status=ok,address=192.168.1.12:6379,slaves=2,sentinels=3192.168.1.12:26479> sentinel masters1) 1) "name" 2) "mymaster" 3) "ip" 4) "192.168.1.12" 5) "port" 6) "6379" 7) "runid" 8) "0a4b1b8c6b3595dde9446697a025fca0f0530ac7" 9) "flags" 10) "master" ........................................................ 31) "num-slaves" 32) "2" 33) "num-other-sentinels" 34) "2" 35) "quorum" 36) "1" 37) "failover-timeout" 38) "60000" 39) "parallel-syncs" 40) "1"192.168.1.12:26479> sentinel slaves mymaster1) 1) "name" 2) "192.168.1.13:6379" 3) "ip" 4) "192.168.1.13" 5) "port" 6) "6379" 7) "runid" 8) "eb29d1741121071accc633db186f63b81fc33ffc" 9) "flags" 10) "slave" ........................................................ 29) "master-link-down-time" 30) "0" 31) "master-link-status" 32) "ok" 33) "master-host" 34) "192.168.1.12" 35) "master-port" 36) "6379" 37) "slave-priority" 38) "97" 39) "slave-repl-offset" 40) "112029"2) 1) "name" 2) "192.168.1.11:6379" 3) "ip" 4) "192.168.1.11" 5) "port" 6) "6379" 7) "runid" 8) "" 9) "flags" 10) "s_down,slave,disconnected" .............................................. 27) "role-reported" 28) "slave" 29) "role-reported-time" 30) "546434" 31) "master-link-down-time" 32) "0" 33) "master-link-status" 34) "err" 35) "master-host" 36) "?" 37) "master-port" 38) "0" 39) "slave-priority" 40) "100" 41) "slave-repl-offset" 42) "0"
假如此时192.168.1.11这台服务器的redis-server恢复了，也会被加入slave队列中
[root@station11 ~]# nohup redis-server /etc/redis/redis.conf&
[root@station11 ~]# tail -f sentinel_master.log
6732:X 23 Jan 01:35:31.759 # -sdown slave 192.168.1.11:6379 192.168.1.11 6379 @ mymaster 192.168.1.12 63796732:X 23 Jan 01:35:41.740 * +convert-to-slave slave 192.168.1.11:6379 192.168.1.11 6379 @ mymaster 192.168.1.12 6379
[root@station12 ~]#tail -f redis_6379.log
7846:M 23 Jan 01:35:42.083 * Slave 192.168.1.11:6379 asks for synchronization7846:M 23 Jan 01:35:42.083 * Full resync requested by slave 192.168.1.11:63797846:M 23 Jan 01:35:42.083 * Starting BGSAVE for SYNC with target: disk7846:M 23 Jan 01:35:42.084 * Background saving started by pid 78597859:C 23 Jan 01:35:42.095 * DB saved on disk7859:C 23 Jan 01:35:42.095 * RDB: 6 MB of memory used by copy-on-write7846:M 23 Jan 01:35:42.177 * Background saving terminated with success7846:M 23 Jan 01:35:42.178 * Synchronization with slave 192.168.1.11:6379 succeeded
5、查看故障转移之后redis和sentinel配置文件的变化
5.1、首先查看三台redis的redis.conf文件
因为模拟1.11服务器的redis-server宕机而后又重新开启，所以sentinel机制rewrite了redis.conf文件，如下：
[root@station11 ~]# vim /etc/redis/redis.conf
# Generated by CONFIG REWRITEslaveof 192.168.1.12 6379
rewrite机制在1.11的redis.conf末尾添加了如上2行，表示指向1.12这台新的master
查看1.12的redis.conf文件，你会发现原来的参数slaveof 192.168.1.11 6379 已经消失了！
查看1.13的redis.conf文件，如下：
slaveof 192.168.1.12 6379
由原来的指向192.168.1.11变成了指向新的master 192.168.1.12
6、查看三台redis的sentinel.conf文件
1.11上的sentinel.conf文件：
#cat sentinel.confport 26379sentinel monitor mymaster 192.168.1.12 6379 1 #已经由原来的192.168.1.11变成了192.168.1.12# Generated by CONFIG REWRITEsentinel known-slave mymaster 192.168.1.11 6379sentinel known-slave mymaster 192.168.1.13 6379sentinel known-sentinel mymaster 192.168.1.12 26479 7c000aa564ed603eeefd031333ebc2c916597ec6sentinel known-sentinel mymaster 192.168.1.13 26579 a78518e4955d3602c61e212be0cbdc378daa3cdc #后边的字符串是sentinel启动时候为每一台redis生成的唯一标识
1.12上的sentinel.conf
#cat sentinel.confport 26479sentinel monitor mymaster 192.168.1.12 6379 1# Generated by CONFIG REWRITEsentinel known-slave mymaster 192.168.1.13 6379sentinel known-slave mymaster 192.168.1.11 6379sentinel known-sentinel mymaster 192.168.1.13 26579 a78518e4955d3602c61e212be0cbdc378daa3cdcsentinel known-sentinel mymaster 192.168.1.11 26379 17c9ee07632d60c4c0aa75a853bbda93966caa22
1.13上的sentinel.conf
#cat sentinel.confport 26579sentinel monitor mymaster 192.168.1.12 6379 1# Generated by CONFIG REWRITEsentinel known-slave mymaster 192.168.1.11 6379sentinel known-slave mymaster 192.168.1.13 6379sentinel known-sentinel mymaster 192.168.1.12 26479 7c000aa564ed603eeefd031333ebc2c916597ec6sentinel known-sentinel mymaster 192.168.1.11 26379 17c9ee07632d60c4c0aa75a853bbda93966caa22
本文出自 “aha45” 博客，请务必保留此出处http://manfred12.blog.51cto.com/137312/1901872