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使用Sentinel机制实现Redis高可用主从复制

[日期:2017-02-28] 来源:Linux社区  作者:aha45 [字体: ]

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/bash
cd /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/6379
slaveof 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 synchronization
6447: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 192.168.1.11:6379
7655: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 192.168.1.13
slaveof 192.168.1.11 6379
slave-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 192.168.1.11:6379
5659: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
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.1.12,port=6379,state=online,offset=1023,lag=1
slave1:ip=192.168.1.13,port=6379,state=online,offset=1023,lag=1
master_repl_offset:1023
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:1022
192.168.1.11:6379> set 1 1000
OK
192.168.1.11:6379> 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 26379
sentinel monitor mymaster 192.168.1.11 6379 1
sentinel down-after-milliseconds mymaster 5000
sentinel failover-timeout mymaster 60000
logfile "/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 26479
logfile "/var/log/sentinel_slave1.log"

3.3、从库slave1的sentinel配置文件

[root@station13 ~]# vim /etc/redis/sentinel.conf

port 26579
logfile "/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 17c9ee07632d60c4c0aa75a853bbda93966caa22
6640:X 23 Jan 00:22:34.910 # +monitor master mymaster 192.168.1.11 6379 quorum 1
6640:X 23 Jan 00:22:34.910 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 6379
6640: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 7c000aa564ed603eeefd031333ebc2c916597ec6
7782:X 23 Jan 00:24:36.059 # +monitor master mymaster 192.168.1.11 6379 quorum 1
7782:X 23 Jan 00:24:36.060 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 6379
7782:X 23 Jan 00:24:36.061 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 6379
7782:X 23 Jan 00:24:36.516 * +sentinel sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 6379
7782: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 a78518e4955d3602c61e212be0cbdc378daa3cdc
5763:X 23 Jan 00:26:14.286 # +monitor master mymaster 192.168.1.11 6379 quorum 1
5763:X 23 Jan 00:26:14.287 * +slave slave 192.168.1.12:6379 192.168.1.12 6379 @ mymaster 192.168.1.11 6379
5763:X 23 Jan 00:26:14.288 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.11 6379
5763:X 23 Jan 00:26:14.708 * +sentinel sentinel 7c000aa564ed603eeefd031333ebc2c916597ec6 192.168.1.12 26479 @ mymaster 192.168.1.11 6379
5763:X 23 Jan 00:26:15.779 * +sentinel sentinel 17c9ee07632d60c4c0aa75a853bbda93966caa22 192.168.1.11 26379 @ mymaster 192.168.1.11 6379
5763:X 23 Jan 00:26:19.716 # +sdown sentinel 7c000aa564ed603eeefd031333ebc2c916597ec6 192.168.1.12 26479 @ mymaster 192.168.1.11 6379
5763: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
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.1.11:6379,slaves=2,sentinels=3
127.0.0.1:26379> sentinel masters
1)  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 mymaster
1)  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
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.1.12,port=6379,state=online,offset=131310,lag=0
master_repl_offset:131310
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_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 6379
6640: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
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.1.12,port=6379,state=online,offset=162401,lag=1
slave1:ip=192.168.1.13,port=6379,state=online,offset=162401,lag=1
master_repl_offset:162401
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_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 6379
6640:X 23 Jan 00:39:07.305 # +odown master mymaster 192.168.1.11 6379 #quorum 1/1
6640:X 23 Jan 00:39:07.305 # +new-epoch 1
6640:X 23 Jan 00:39:07.305 # +try-failover master mymaster 192.168.1.11 6379
6640:X 23 Jan 00:39:07.308 # +vote-for-leader 17c9ee07632d60c4c0aa75a853bbda93966caa22 1
6640:X 23 Jan 00:39:17.380 # -failover-abort-not-elected master mymaster 192.168.1.11 6379
6640:X 23 Jan 00:39:17.438 # Next failover delay: I will not start a failover before Mon Jan 23 00:41:07 2017
6640:X 23 Jan 00:41:07.432 # +new-epoch 2
6640:X 23 Jan 00:41:07.432 # +try-failover master mymaster 192.168.1.11 6379
6640:X 23 Jan 00:41:07.434 # +vote-for-leader 17c9ee07632d60c4c0aa75a853bbda93966caa22 2
6640:X 23 Jan 00:41:17.505 # -failover-abort-not-elected master mymaster 192.168.1.11 6379
6640: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 18
6732:X 23 Jan 01:24:18.933 # +vote-for-leader a78518e4955d3602c61e212be0cbdc378daa3cdc 18
6732:X 23 Jan 01:24:18.946 # +sdown master mymaster 192.168.1.11 6379
6732:X 23 Jan 01:24:18.946 # +odown master mymaster 192.168.1.11 6379 #quorum 1/1
6732:X 23 Jan 01:24:18.946 # Next failover delay: I will not start a failover before Mon Jan 23 01:26:19 2017
6732:X 23 Jan 01:24:19.240 # +config-update-from sentinel a78518e4955d3602c61e212be0cbdc378daa3cdc 192.168.1.13 26579 @ mymaster 192.168.1.11 6379
6732: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12
6732:X 23 Jan 01:24:19.241 * +slave slave 192.168.1.13:6379 192.168.1.13 6379 @ mymaster 192.168.1.12 6379
6732:X 23 Jan 01:24:19.241 * +slave slave 192.168.1.11:6379 192.168.1.11 6379 @ mymaster 192.168.1.12 6379
6732: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 synchronization
7846:M 23 Jan 01:24:19.061 * Full resync requested by slave 192.168.1.13:6379
7846:M 23 Jan 01:24:19.061 * Starting BGSAVE for SYNC with target: disk
7846:M 23 Jan 01:24:19.061 * Background saving started by pid 7852
7852:C 23 Jan 01:24:19.091 * DB saved on disk
7852:C 23 Jan 01:24:19.091 * RDB: 8 MB of memory used by copy-on-write
7846:M 23 Jan 01:24:19.178 * Background saving terminated with success
7846: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
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.1.13,port=6379,state=online,offset=65036,lag=0
master_repl_offset:65036
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:65035

[root@station12 ~]# redis-cli -h 192.168.1.12 -p 26479

192.168.1.12:26479> info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=192.168.1.12:6379,slaves=2,sentinels=3
192.168.1.12:26479> sentinel masters
1)  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 mymaster
1)  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 6379
6732: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 synchronization
7846:M 23 Jan 01:35:42.083 * Full resync requested by slave 192.168.1.11:6379
7846:M 23 Jan 01:35:42.083 * Starting BGSAVE for SYNC with target: disk
7846:M 23 Jan 01:35:42.084 * Background saving started by pid 7859
7859:C 23 Jan 01:35:42.095 * DB saved on disk
7859:C 23 Jan 01:35:42.095 * RDB: 6 MB of memory used by copy-on-write
7846:M 23 Jan 01:35:42.177 * Background saving terminated with success
7846: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 REWRITE
slaveof 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.conf
port 26379
sentinel 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 REWRITE
sentinel known-slave mymaster 192.168.1.11 6379
sentinel known-slave mymaster 192.168.1.13 6379
sentinel known-sentinel mymaster 192.168.1.12 26479 7c000aa564ed603eeefd031333ebc2c916597ec6
sentinel 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.conf
port 26479
sentinel monitor mymaster 192.168.1.12 6379 1
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 192.168.1.13 6379
sentinel known-slave mymaster 192.168.1.11 6379
sentinel known-sentinel mymaster 192.168.1.13 26579 a78518e4955d3602c61e212be0cbdc378daa3cdc
sentinel known-sentinel mymaster 192.168.1.11 26379 17c9ee07632d60c4c0aa75a853bbda93966caa22

1.13上的sentinel.conf

#cat sentinel.conf
port 26579
sentinel monitor mymaster 192.168.1.12 6379 1
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 192.168.1.11 6379
sentinel known-slave mymaster 192.168.1.13 6379
sentinel known-sentinel mymaster 192.168.1.12 26479 7c000aa564ed603eeefd031333ebc2c916597ec6
sentinel known-sentinel mymaster 192.168.1.11 26379 17c9ee07632d60c4c0aa75a853bbda93966caa22

下面关于Redis的文章您也可能喜欢,不妨参考下:

Ubuntu 14.04下Redis安装及简单测试 http://www.linuxidc.com/Linux/2014-05/101544.htm

Redis主从复制基本配置 http://www.linuxidc.com/Linux/2015-03/115610.htm

Redis高可用方案深入解析  http://www.linuxidc.com/Linux/2017-02/140637.htm

Ubuntu 14.04安装Redis与简单配置 http://www.linuxidc.com/Linux/2017-01/139075.htm

Ubuntu 16.04环境中安装PHP7.0 Redis扩展 http://www.linuxidc.com/Linux/2016-09/135631.htm

CentOS 7.0 安装Redis 3.2.1详细过程和使用常见问题 http://www.linuxidc.com/Linux/2016-09/135071.htm

Ubuntu 16.04环境中安装PHP7.0 Redis扩展 http://www.linuxidc.com/Linux/2016-09/135631.htm

Ubuntu 15.10下Redis集群部署文档 http://www.linuxidc.com/Linux/2016-06/132340.htm

Redis实战 中文PDF http://www.linuxidc.com/Linux/2016-04/129932.htm

CentOS 7下Redis的安装与配置 http://www.linuxidc.com/Linux/2017-02/140363.htm

Redis 的详细介绍请点这里
Redis 的下载地址请点这里

本文永久更新链接地址http://www.linuxidc.com/Linux/2017-02/141136.htm

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