环境
| 主机名 | 主机IP地址 |
|---|
| Master | 192.168.36.110 |
| Slave-1 | 192.168.36.111 |
| Slave-2 | 192.168.36.112 |
环境前确保开启Redis服务
[root@Master ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:* [root@Slave-1 ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:* [root@Slave-2 ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:*
手动配置Master
Slave-1配置slave
[root@Slave-1 ~]#vim /apps/redis/etc/redis.conf .... 281 slaveof 192.168.36.110 6379 # slaveof指向master 288 masterauth 123456 .... [root@Slave-1 ~]#ps -ef | grep redis root 7397 1 0 10:45 ? 00:00:01 redis-server 0.0.0.0:6379 root 7484 7349 0 10:54 pts/0 00:00:00 grep --color=auto redis [root@Slave-1 ~]#kill -9 7397 # 终止进程 [root@Slave-1 ~]#redis-server /apps/redis/etc/redis.conf # 重新加载配置文件
Slave-2配置slave
[root@Slave-2 ~]#vim /apps/redis/etc/redis.conf .... 281 slaveof 192.168.36.110 6379 288 masterauth 123456 .... [root@Slave-2 ~]#ps -ef | grep redis root 8017 1 0 10:44 ? 00:00:01 redis-server 0.0.0.0:6379 root 8173 7926 0 10:56 pts/0 00:00:00 grep --color=auto redis [root@Slave-2 ~]#kill 8017 [root@Slave-2 ~]#redis-server /apps/redis/etc/redis.conf # 重新加载配置文件
状态查看
# Slave-1状态 [root@Slave-1 ~]#redis-cli 127.0.0.1:6379> AUTH 123456 OK 127.0.0.1:6379> INFO replication # Replication role:slave # 已变为slave master_host:192.168.36.110 master_port:6379 master_link_status:up # 开启了状态同步 master_last_io_seconds_ago:8 master_sync_in_progress:0 slave_repl_offset:84 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:99a1dcabb930a97bbdea90450b2f891778c83e37 master_replid2:0000000000000000000000000000000000000000 # 保存了上一次的master_replid的值，当发生故障转移后此值会记录当前的master的id master_repl_offset:84 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:84 # Slave-2 状态 [root@Slave-2 ~]#redis-cli 127.0.0.1:6379> AUTH 123456 OK 127.0.0.1:6379> INFO replication # Replication role:slave # 已变为slave master_host:192.168.36.110 master_port:6379 master_link_status:up # 开启了状态同步 master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:224 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:99a1dcabb930a97bbdea90450b2f891778c83e37 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:224 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:155 repl_backlog_histlen:70 # Master状态 [root@Master ~]#redis-cli 127.0.0.1:6379> AUTH 123456 OK 127.0.0.1:6379> INFO replication # Replication role:master connected_slaves:2 # 2个slave，此时Slave-1、Slave-2已经加入进来 slave0:ip=192.168.36.111,port=6379,state=online,offset=336,lag=1 slave1:ip=192.168.36.112,port=6379,state=online,offset=336,lag=1 master_replid:99a1dcabb930a97bbdea90450b2f891778c83e37 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:336 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:336 # 此时两个slave同步master数据，可以查看但不能写数据 127.0.0.1:6379> KEYS * 1) "key3" 2) "key2" 3) "key1" 127.0.0.1:6379> SET key5 value5 (error) READONLY You can't write aga×××t a read only slave. 127.0.0.1:6379> GET key3 "value4"
三台服务器编辑sentinel配置文件
# 由于Redis为编译安装，所以需要cp拷贝sentinel配置文件 # 如果yum安装，则存在sentinel配置文件，无需拷贝 [root@Master ~]#cp /root/redis-4.0.14/sentinel.conf /apps/redis/etc/
Master配置
[root@Master ~]#vim /apps/redis/etc/sentinel.conf [root@Master ~]#grep "^[a-Z]" /apps/redis/etc/sentinel.conf bind 0.0.0.0 port 26379 daemonize yes #pidfile "redis-sentinel.pid" logfile "sentinel_26379.log" dir "/apps/redis/" sentinel deny-scripts-reconfig yes sentinel monitor mymaster 192.168.36.111 6379 2 # 法定人数限制(quorum)，即有几个 slave 认为 master down 了就进行故障转移 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 10000 # (SDOWN)主观下线的时间，单位（毫秒） sentinel parallel-syncs mymaster 1 # 发生故障转移时候同时向新 master 同步数据的 slave 数量， 数字越小总同步时间越长 sentinel failover-timeout mymaster 180000 # 所有 slaves 指向新的 master 所需的超时时间 sentinel deny-scripts-reconfig yes # 禁止修改脚本 # 将配置文件scp到两个slave节点 [root@Master redis-4.0.14]#scp /apps/redis/sentinel.conf 192.168.36.111:/apps/redis/ root@192.168.36.111's password: sentinel.conf 100% 282 214.2KB/s 00:00 [root@Master redis-4.0.14]#scp /apps/redis/sentinel.conf 192.168.36.112:/apps/redis/ root@192.168.36.112's password: sentinel.conf 100% 282 267.0KB/s 00:00
启动哨兵
[root@Master ~]#redis-sentinel /apps/redis/etc/sentinel.conf [root@Master ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 511 *:26379 *:* [root@Slave-1 ~]#redis-sentinel /apps/redis/etc/sentinel.conf [root@Slave-2 ~]#redis-sentinel /apps/redis/etc/sentinel.conf
哨兵日志
[root@Master ~]#tail -f /apps/redis/logs/sentinel_26379.log 14129:X 14 Jun 16:23:34.697 # Sentinel is now ready to exit, bye bye... 14134:X 14 Jun 16:23:40.985 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo 14134:X 14 Jun 16:23:40.985 # Redis version=4.0.14, bits=64, commit=00000000, modified=0, pid=14134, just started 14134:X 14 Jun 16:23:40.985 # Configuration loaded 14134:X 14 Jun 16:23:40.986 * Increased maximum number of open files to 10032 (it was originally set to 1024). 14134:X 14 Jun 16:23:40.987 * Running mode=sentinel, port=26379. 14134:X 14 Jun 16:23:40.987 # Sentinel ID is 69d6647e2c6236b5b72d8e943b5d5707db47b9a4 14134:X 14 Jun 16:23:40.987 # +monitor master mymaster 192.168.36.110 6379 quorum 2 14134:X 14 Jun 16:23:43.015 * +sentinel sentinel abeb0c89a25c690b5cbe09491de6ab822deee15e 192.168.36.112 26379 @ mymaster 192.168.36.110 6379 14134:X 14 Jun 16:23:43.050 * +sentinel sentinel 4d3b7eb172aaef1a58b35c1a567534c67f3977ef 192.168.36.111 26379 @ mymaster 192.168.36.110 6379
状态查看
[root@Master ~]#redis-cli -h 192.168.36.110 -p 26379 # 通过哨兵26379端口进行查看 192.168.36.110:26379> 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=192.168.36.110:6379,slaves=2,sentinels=3
停止master节点的redis服务时哨兵日志变化
[root@Master ~]#tail -f /apps/redis/logs/sentinel_26379.log 14232:X 14 Jun 16:29:58.189 # +sdown master mymaster 192.168.36.110 6379 14232:X 14 Jun 16:29:58.218 # +new-epoch 1 14232:X 14 Jun 16:29:58.219 # +vote-for-leader 4d3b7eb172aaef1a58b35c1a567534c67f3977ef 1 14232:X 14 Jun 16:29:58.266 # +odown master mymaster 192.168.36.110 6379 #quorum 3/2 14232:X 14 Jun 16:29:58.266 # Next failover delay: I will not start a failover before Fri Jun 14 16:35:58 2019 14232:X 14 Jun 16:29:59.468 # +config-update-from sentinel 4d3b7eb172aaef1a58b35c1a567534c67f3977ef 192.168.36.111 26379 @ mymaster 192.168.36.110 6379 14232:X 14 Jun 16:29:59.468 # +switch-master mymaster 192.168.36.110 6379 192.168.36.111 6379 14232:X 14 Jun 16:29:59.469 * +slave slave 192.168.36.112:6379 192.168.36.112 6379 @ mymaster 192.168.36.111 6379 14232:X 14 Jun 16:29:59.469 * +slave slave 192.168.36.110:6379 192.168.36.110 6379 @ mymaster 192.168.36.111 6379 14232:X 14 Jun 16:30:29.507 # +sdown slave 192.168.36.110:6379 192.168.36.110 6379 @ mymaster 192.168.36.111 6379
查看哨兵信息
[root@Master ~]#redis-cli -h 192.168.36.110 -p 26379 192.168.36.110:26379> 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=192.168.36.111:6379,slaves=2,sentinels=3
故障转移后的redis配置文件变化
# 故障转移后 redis.conf 中的 replicaof 行的 master IP 会被修改， sentinel.conf 中的 sentinel monitor IP 会被修改 [root@Slave-1 ~]#cat /apps/redis/sentinel.conf bind 0.0.0.0 port 26379 logfile "sentinel_26379.log" dir "/apps/redis/logs" sentinel myid 4d3b7eb172aaef1a58b35c1a567534c67f3977ef sentinel deny-scripts-reconfig yes sentinel monitor mymaster 192.168.36.111 6379 2 sentinel auth-pass mymaster 123456 sentinel config-epoch mymaster 1 # Generated by CONFIG REWRITE sentinel leader-epoch mymaster 1 sentinel known-slave mymaster 192.168.36.110 6379 sentinel known-slave mymaster 192.168.36.112 6379 sentinel known-sentinel mymaster 192.168.36.110 26379 69d6647e2c6236b5b72d8e943b5d5707db47b9a4 sentinel known-sentinel mymaster 192.168.36.112 26379 abeb0c89a25c690b5cbe09491de6ab822deee15e sentinel current-epoch 1
当前redis状态
[root@Slave-1 ~]#redis-cli 127.0.0.1:6379> AUTH 123456 OK 127.0.0.1:6379> INFO replication # Replication role:master # Slave-1变为master节点 connected_slaves:1 # slave0:ip=192.168.36.112,port=6379,state=online,offset=162954,lag=1 master_replid:e95e0241596bd1073ca558fc7cb892a7a6b4dbe6 # 故障转移后的当前master_replid master_replid2:305f29a1bce5172f4c7e263de0d346fd33362d4d # 故障转移前的master_replid master_repl_offset:163240 second_repl_offset:72111 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:163240 [root@Slave-2 ~]#redis-cli 127.0.0.1:6379> AUTH 123456 OK 127.0.0.1:6379> INFO replication # Replication role:slave master_host:192.168.36.111 # 故障转移后新master IP地址 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:187718 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:e95e0241596bd1073ca558fc7cb892a7a6b4dbe6 master_replid2:305f29a1bce5172f4c7e263de0d346fd33362d4d master_repl_offset:187718 second_repl_offset:72111 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:71 repl_backlog_histlen:187648
