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三台机器 192.168.21.6/7/8
redis版本: redis-3.2.1
分别在三台机器上安装redis:
解压:
# tar zxvf redis-3.2.1.tar.gz -C /usr/local
重命名:
# mv /usr/local/redis-3.2.1 /usr/local/redis
安装：
# cd /usr/local/redis
# make
# make install
# mkdir -p /usr/local/redis/etc
# cp /usr/local/redis/redis.conf /usr/local/redis/sentinel.conf /usr/local/redis/etc
登陆192.168.21.6，修改redis.conf:
#bind 127.0.0.1
bind 0.0.0.0
登陆192.168.21.7/8,修改redis.conf:
#bind 127.0.0.1
bind 0.0.0.0
slaveof 10.10.10.11 6379
保存退出，然后在三台机器上启动redis
/usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf &
登陆192.168.21.6查看redis复制状态:
# redis-cli info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.21.8,port=6379,state=online,offset=198371,lag=0
slave1:ip=192.168.21.7,port=6379,state=online,offset=198371,lag=1
哨兵配置:
新建目录:
# mkdir -p /usr/local/redis/db_26379
三台机器上修改/usr/local/redis/sentinel.conf,加入如下配置:
dir "/usr/local/redis/db_26379"
pidfile "/usr/local/redis/db_26379/redis_26379.pid"
loglevel notice
logfile "/usr/local/redis/db_26379/sentinel.log"
bind 0.0.0.0
:x保存退出.
备注:其他配置的地方保持不变.
然后在192.168.21.6/7/8上分别启动哨兵sentinel：
/usr/local/bin/redis-server /usr/local/redis/etc/sentinel.conf --sentinel &
然后在三台机器192.168.21.6/7/8上执行手动添加master的操作:
# redis-cli -p 26379 sentinel monitor chenfeng 192.168.21.6 6379 2
OK
查看日志:
# tail -f /data/redis/db_26379/sentinel.log
24177:X 20 Sep 10:06:06.563 * +sentinel sentinel 4eca392422764f3e3f4c0df7aaafc71c416c1a33 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:06:07.816 * +sentinel-invalid-addr sentinel 4eca392422764f3e3f4c0df7aaafc71c416c1a33 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:06:07.816 * +sentinel sentinel 40df350a0e705be6cbafbd83ae18ba51964f3a21 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:06:08.573 * +sentinel-address-switch master mymaster 127.0.0.1 6379 ip 127.0.0.1 port 26379 for 1ecb5a5c14cb85b33935037182fb04d107b47c82
24177:X 20 Sep 10:06:09.854 * +sentinel-address-switch master mymaster 127.0.0.1 6379 ip 127.0.0.1 port 26379 for 4eca392422764f3e3f4c0df7aaafc71c416c1a33
24177:X 20 Sep 10:06:40.396 # +monitor master chenfeng 192.168.21.6 6379 quorum 2
24177:X 20 Sep 10:06:40.446 * +slave slave 192.168.21.7:6379 192.168.21.7 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:06:40.447 * +slave slave 192.168.21.8:6379 192.168.21.8 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:06:52.383 * +sentinel sentinel 1ecb5a5c14cb85b33935037182fb04d107b47c82 192.168.21.7 26379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:06:54.482 * +sentinel sentinel 4eca392422764f3e3f4c0df7aaafc71c416c1a33 127.0.0.1 26379 @ chenfeng 192.168.21.6 6379
登陆192.168.21.6,手动模拟主库故障:
#redis-cli -p 6379 shutdown
查看日志：
# tail -f /data/redis/db_26379/sentinel.log
24177:X 20 Sep 10:08:11.071 # +sdown master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:11.071 # +sdown master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.172 # +odown master mymaster 127.0.0.1 6379 #quorum 4/2
24177:X 20 Sep 10:08:11.172 # +new-epoch 1
24177:X 20 Sep 10:08:11.172 # +try-failover master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:11.181 # +vote-for-leader 4eca392422764f3e3f4c0df7aaafc71c416c1a33 1
24177:X 20 Sep 10:08:11.181 # +odown master chenfeng 192.168.21.6 6379 #quorum 3/2
24177:X 20 Sep 10:08:11.181 # +new-epoch 2
24177:X 20 Sep 10:08:11.181 # +try-failover master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.198 # +vote-for-leader 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:11.198 # 4eca392422764f3e3f4c0df7aaafc71c416c1a33 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 1
24177:X 20 Sep 10:08:11.198 # 4eca392422764f3e3f4c0df7aaafc71c416c1a33 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:11.198 # 40df350a0e705be6cbafbd83ae18ba51964f3a21 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 1
24177:X 20 Sep 10:08:11.198 # 1ecb5a5c14cb85b33935037182fb04d107b47c82 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 1
24177:X 20 Sep 10:08:11.198 # 1ecb5a5c14cb85b33935037182fb04d107b47c82 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:11.260 # +elected-leader master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.260 # +failover-state-select-slave master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.360 # +selected-slave slave 192.168.21.7:6379 192.168.21.7 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.361 * +failover-state-send-slaveof-noone slave 192.168.21.7:6379 192.168.21.7 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.451 * +failover-state-wait-promotion slave 192.168.21.7:6379 192.168.21.7 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.898 # +promoted-slave slave 192.168.21.7:6379 192.168.21.7 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.898 # +failover-state-reconf-slaves master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:11.948 * +slave-reconf-sent slave 192.168.21.8:6379 192.168.21.8 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:12.269 # +vote-for-leader 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:12.270 # 4eca392422764f3e3f4c0df7aaafc71c416c1a33 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:12.270 # 40df350a0e705be6cbafbd83ae18ba51964f3a21 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:12.270 # 1ecb5a5c14cb85b33935037182fb04d107b47c82 voted for 4eca392422764f3e3f4c0df7aaafc71c416c1a33 2
24177:X 20 Sep 10:08:12.353 # +elected-leader master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:12.353 # +failover-state-select-slave master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:12.424 # +selected-slave slave 192.168.21.7:6379 192.168.21.7 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:12.424 * +failover-state-send-slaveof-noone slave 192.168.21.7:6379 192.168.21.7 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:12.491 * +failover-state-wait-promotion slave 192.168.21.7:6379 192.168.21.7 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:12.916 * +slave-reconf-inprog slave 192.168.21.8:6379 192.168.21.8 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:12.916 * +slave-reconf-done slave 192.168.21.8:6379 192.168.21.8 6379 @ chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:13.015 # +failover-end master chenfeng 192.168.21.6 6379
24177:X 20 Sep 10:08:13.015 # +switch-master chenfeng 192.168.21.6 6379 192.168.21.7 6379
24177:X 20 Sep 10:08:13.016 * +slave slave 192.168.21.8:6379 192.168.21.8 6379 @ chenfeng 192.168.21.7 6379
24177:X 20 Sep 10:08:13.016 * +slave slave 192.168.21.6:6379 192.168.21.6 6379 @ chenfeng 192.168.21.7 6379
24177:X 20 Sep 10:08:13.297 # +promoted-slave slave 192.168.21.7:6379 192.168.21.7 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:13.297 # +failover-state-reconf-slaves master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:13.352 * +slave-reconf-sent slave 192.168.21.8:6379 192.168.21.8 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:14.345 * +slave-reconf-inprog slave 192.168.21.8:6379 192.168.21.8 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:14.345 * +slave-reconf-done slave 192.168.21.8:6379 192.168.21.8 6379 @ mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:14.420 # +failover-end master mymaster 127.0.0.1 6379
24177:X 20 Sep 10:08:14.420 # +switch-master mymaster 127.0.0.1 6379 192.168.21.7 6379
24177:X 20 Sep 10:08:14.420 * +slave slave 192.168.21.8:6379 192.168.21.8 6379 @ mymaster 192.168.21.7 6379
24177:X 20 Sep 10:08:14.420 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 192.168.21.7 6379
24177:X 20 Sep 10:08:43.065 # +sdown slave 192.168.21.6:6379 192.168.21.6 6379 @ chenfeng 192.168.21.7 6379
24177:X 20 Sep 10:08:44.465 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 192.168.21.7 6379
24177:X 20 Sep 10:09:13.307 # -sdown slave 192.168.21.6:6379 192.168.21.6 6379 @ chenfeng 192.168.21.7 6379
24177:X 20 Sep 10:09:13.595 # -sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 192.168.21.7 6379
24177:X 20 Sep 10:09:23.221 * +convert-to-slave slave 192.168.21.6:6379 192.168.21.6 6379 @ chenfeng 192.168.21.7 6379
24177:X 20 Sep 10:09:25.310 * +slave slave 192.168.21.6:6379 192.168.21.6 6379 @ mymaster 192.168.21.7 6379
从以上日志里可以发现哨兵自动选举出了新的主库192.168.21.7,故障切换成功。
再次启动原主库192.168.21.6，成为了192.168.21.7的从库:
# redis-cli info replication
# Replication
role:slave
master_host:192.168.21.7
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:25901
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
至此，哨兵模式安装和测试完毕。