标签：mod redis配置 nec after 修改端口号 orm 转换 mode his
服务器描述：本次搭建是用来测试，所以是在一台服务器上搭建三个redis服务（一主两从）
|
服务角色 |
端口 |
Redis.conf名称 |
sentinel配置文件名称 |
sentinel端口 |
redis日志路径 |
sentinel路劲 |
|
主(master) |
6379 |
redis.conf |
sentinel.conf |
26379 |
/home/zhangxs/data/redislog/redis_server/master.log |
/home/zhangxs/data/redislog/sentinel/sentinel6379.log |
|
从(slave) |
6380 |
redis_slave6380.conf |
Sentinel6380.conf |
26380 |
/home/zhangxs/data/redislog/redis_server/slave6380.log |
/home/zhangxs/data/redislog/sentinel/sentinel6380.log |
|
从(slave) |
6381 |
redis_slave6381.conf |
Sentinel6381.conf |
26381 |
/home/zhangxs/data/redislog/redis_server/slave6381.log |
/home/zhangxs/data/redislog/sentinel/sentinel6381.log |
修改配置文件
修改redis服务日志路径：logfile "/home/zhangxs/data/redislog/redis_server/master.log"
其他没有修改，使用的是默认配置
上面配置好后，启动redis服务
src/redis-server redis.conf&
src/redis-server redis_slave6380.conf &
查看主服务日志，会发现多出来一段
2755:M 29 Jul 00:13:25.469 * Starting BGSAVE for SYNC with target: disk
2755:M 29 Jul 00:13:25.502 * Background saving started by pid 2784
2784:C 29 Jul 00:13:25.608 * DB saved on disk
2784:C 29 Jul 00:13:25.608 * RDB: 6 MB of memory used by copy-on-write
2755:M 29 Jul 00:13:25.677 * Background saving terminated with success
2755:M 29 Jul 00:13:25.677 * Synchronization with slave 127.0.0.1:6380 succeeded //同步到从服务127.0.0.1:6380成功
|
查看从服务日志slave6380.log
2780:S 29 Jul 00:13:25.436 * DB loaded from disk: 0.007 seconds 2780:S 29 Jul 00:13:25.436 * Before turning into a slave, using my master parameters to synthesize a cached master: I may be able to synchronize with the new master with just a partial transfer. 2780:S 29 Jul 00:13:25.436 * Ready to accept connections 2780:S 29 Jul 00:13:25.436 * Connecting to MASTER 127.0.0.1:6379 //正在连接master服务 2780:S 29 Jul 00:13:25.436 * MASTER <-> SLAVE sync started //master到slave 启动同步 2780:S 29 Jul 00:13:25.436 * Non blocking connect for SYNC fired the event. 2780:S 29 Jul 00:13:25.436 * Master replied to PING, replication can continue... 2780:S 29 Jul 00:13:25.436 * Trying a partial resynchronization (request a26696cff5d35f38896c4eb068f71adbb7cfc421:474104). 2780:S 29 Jul 00:13:25.577 * Full resync from master: 541cd938f43b4f144e647881af409fa1884ea5a4:0 //从master全量同步 2780:S 29 Jul 00:13:25.577 * Discarding previously cached master state.//丢弃之前缓存的master状态 2780:S 29 Jul 00:13:25.677 * MASTER <-> SLAVE sync: receiving 250 bytes from master //slave从master 同步250个字节 2780:S 29 Jul 00:13:25.677 * MASTER <-> SLAVE sync: Flushing old data 2780:S 29 Jul 00:13:25.677 * MASTER <-> SLAVE sync: Loading DB in memory 2780:S 29 Jul 00:13:25.678 * MASTER <-> SLAVE sync: Finished with success
|
src/redis-server redis_slave6381.conf &
查看主服务日志，会发现多出来一段
//从服务127.0.0.1:6381发送同步请求
2755:M 29 Jul 00:26:46.531 * Slave 127.0.0.1:6381 asks for synchronization //接受127.0.1:6381的部分重同步请求。从偏移量1开始发送积压的1106字节 2755:M 29 Jul 00:26:46.531 * Partial resynchronization request from 127.0.0.1:6381 accepted. Sending 1106 bytes of backlog starting from offset 1.
查看从服务日志slave6381.log
2809:S 29 Jul 00:26:46.531 * DB loaded from disk: 0.000 seconds 2809:S 29 Jul 00:26:46.531 * Before turning into a slave, using my master parameters to synthesize a cached master: I may be able to synchronize with the new master with just a partial transfer. 2809:S 29 Jul 00:26:46.531 * Ready to accept connections 2809:S 29 Jul 00:26:46.531 * Connecting to MASTER 127.0.0.1:6379 2809:S 29 Jul 00:26:46.531 * MASTER <-> SLAVE sync started 2809:S 29 Jul 00:26:46.531 * Non blocking connect for SYNC fired the event. 2809:S 29 Jul 00:26:46.531 * Master replied to PING, replication can continue... 2809:S 29 Jul 00:26:46.531 * Trying a partial resynchronization (request 541cd938f43b4f144e647881af409fa1884ea5a4:1). 2809:S 29 Jul 00:26:46.531 * Successful partial resynchronization with master. 2809:S 29 Jul 00:26:46.532 * MASTER <-> SLAVE sync: Master accepted a Partial Resynchronization
1：连接master
[root@vm1 src]# redis-cli -h 127.0.0.1 -p 6379 127.0.0.1:6379> set name fj
2:连接slave6380
[root@vm1 src]# redis-cli -h 127.0.0.1 -p 6380 127.0.0.1:6380> get name "fj" 127.0.0.1:6380>
3:连接slave6381
[root@vm1 src]# redis-cli -h 127.0.0.1 -p 6381 127.0.0.1:6381> get name "fj" 127.0.0.1:6381>
Ok 主从同步没有问题。
默认情况下从服务是不允许set数据的，测试下
127.0.0.1:6380> set name hello (error) READONLY You can‘t write against a read only slave. 127.0.0.1:6380>
127.0.0.1:6381> set name hello (error) READONLY You can‘t write against a read only slave. 127.0.0.1:6381>
启动各个服务的sentinel
src/redis-sentinel sentinel.conf &
2908:X 29 Jul 01:01:32.838 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
2908:X 29 Jul 01:01:32.839 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=2908, just started
2908:X 29 Jul 01:01:32.839 # Configuration loaded
2908:X 29 Jul 01:01:32.839 * Increased maximum number of open files to 10032 (it was originally set to 1024).
2908:X 29 Jul 01:01:32.840 * Running mode=sentinel, port=26379.
2908:X 29 Jul 01:01:32.840 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
2908:X 29 Jul 01:01:32.855 # Sentinel ID is 1a77392638e41bb0ea0a865ffc93b8de6335227f
2908:X 29 Jul 01:01:32.855 # +monitor master mymaster 127.0.0.1 6379 quorum 2
//一个新的从服务器已经被sentinel识别并关联
2908:X 29 Jul 01:01:32.856 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379
2908:X 29 Jul 01:01:32.858 * +slave slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379
src/redis-sentinel sentinel6380.conf &
2937:X 29 Jul 01:08:14.325 # Redis version=4.0.10, bits=64, commit=00000000, modified=0, pid=2937, just started
2937:X 29 Jul 01:08:14.325 # Configuration loaded
2937:X 29 Jul 01:08:14.327 * Increased maximum number of open files to 10032 (it was originally set to 1024).
2937:X 29 Jul 01:08:14.377 * Running mode=sentinel, port=26380.
2937:X 29 Jul 01:08:14.377 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
2937:X 29 Jul 01:08:14.379 # Sentinel ID is 4a6aebffdd1301bf054e722c34e8a6611418ba8a
2937:X 29 Jul 01:08:14.379 # +monitor master mymaster 127.0.0.1 6379 quorum 2
2937:X 29 Jul 01:08:14.380 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379
2937:X 29 Jul 01:08:14.381 * +slave slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379
//一个新的sentinel（监控）已经被识别并关联
2937:X 29 Jul 01:08:14.919 * +sentinel sentinel 1a77392638e41bb0ea0a865ffc93b8de6335227f 127.0.0.1 26379 @ mymaster 127.0.0.1 6379
//一个新的sentinel（监控）已经被识别并关联
2908:X 29 Jul 01:08:16.367 * +sentinel sentinel 4a6aebffdd1301bf054e722c34e8a6611418ba8a 127.0.0.1 26380 @ mymaster 127.0.0.1 6379
新启动一个sentinel，会通过发布订阅功能自动发现监控相同master下的其他sentinel。这一功能是通过向频道 sentinel:hello 发送信息来实现的。
[root@vm1 redis-4.0.10]# src/redis-sentinel sentinel6381.conf &
查看 Sentinel6381.log
2961:X 29 Jul 01:11:09.823 # Configuration loaded 2961:X 29 Jul 01:11:09.823 * Increased maximum number of open files to 10032 (it was originally set to 1024). 2961:X 29 Jul 01:11:09.852 * Running mode=sentinel, port=26381. 2961:X 29 Jul 01:11:09.852 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 2961:X 29 Jul 01:11:09.853 # Sentinel ID is 1db1a4dcdf0ecca00b64d9362c2a2dd338da0030 2961:X 29 Jul 01:11:09.853 # +monitor master mymaster 127.0.0.1 6379 quorum 2 2961:X 29 Jul 01:11:09.853 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 2961:X 29 Jul 01:11:09.855 * +slave slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379 2961:X 29 Jul 01:11:10.334 * +sentinel sentinel 1a77392638e41bb0ea0a865ffc93b8de6335227f 127.0.0.1 26379 @ mymaster 127.0.0.1 6379 2961:X 29 Jul 01:11:11.446 * +sentinel sentinel 4a6aebffdd1301bf054e722c34e8a6611418ba8a 127.0.0.1 26380 @ mymaster 127.0.0.1 6379
|
2908:X 29 Jul 01:11:11.880 * +sentinel sentinel 1db1a4dcdf0ecca00b64d9362c2a2dd338da0030 127.0.0.1 26381 @ mymaster 127.0.0.1 6379 |
|
2937:X 29 Jul 01:11:11.878 * +sentinel sentinel 1db1a4dcdf0ecca00b64d9362c2a2dd338da0030 127.0.0.1 26381 @ mymaster 127.0.0.1 6379 |
sentinel的状态都会记录到sentinel.conf文件中，用于启动后恢复状态，查看下各个sentinel.conf 文件 变动后的部分
|
启动前：无 启动后：sentinel myid 1a77392638e41bb0ea0a865ffc93b8de6335227f //自己的sentinel myid |
|
启动前：无 启动后： # Generated by CONFIG REWRITE #master下得两个从服务 sentinel known-slave mymaster 127.0.0.1 6380 sentinel known-slave mymaster 127.0.0.1 6381 #master下其他两个sentinel sentinel known-sentinel mymaster 127.0.0.1 26380 4a6aebffdd1301bf054e722c34e8a6611418ba8a sentinel known-sentinel mymaster 127.0.0.1 26381 1db1a4dcdf0ecca00b64d9362c2a2dd338da0030 sentinel current-epoch 0 |
Sentinel6380.conf和Sentinel6381.conf改动和sentinel.conf 基本一样。不一样的就是 记录自己sentinel myid和master下其他两个sentinel不一样，大同小异。
测试故障迁移
Sentinel 故障迁移我使用的是默认配置(不需要再配置，可以自定义修改)
//判断master失效，至少有两个sentinel同意才会执行故障迁移
sentinel monitor mymaster 127.0.0.1 6379 2 //如果在10秒内sentinel 都收到master的一次有效回复，就认为该master主观下线 sentinel down-after-milliseconds mymaster 60000 sentinel failover-timeout mymaster 180000
//在执行故障转移时，同时只有一个slave能对新的master进行数据同步
sentinel parallel-syncs mymaster 1
sentinel monitor resque 192.168.1.3 6380 4
sentinel down-after-milliseconds resque 10000
sentinel failover-timeout resque 180000
sentinel parallel-syncs resque 5
root 2755 2551 0 00:11 pts/2 00:00:06 src/redis-server 127.0.0.1:6379 root 2780 2551 0 00:13 pts/2 00:00:06 src/redis-server 127.0.0.1:6380 root 2809 2551 0 00:26 pts/2 00:00:05 src/redis-server 127.0.0.1:6381 root 2816 2529 0 00:30 pts/1 00:00:00 redis-cli -h 127.0.0.1 -p 6379 root 2822 2530 0 00:33 pts/0 00:00:00 redis-cli -h 127.0.0.1 -p 6380 root 2841 2823 0 00:34 pts/6 00:00:00 redis-cli -h 127.0.0.1 -p 6381 root 2908 2551 0 01:01 pts/2 00:00:07 src/redis-sentinel *:26379 [sentinel] root 2937 2551 0 01:08 pts/2 00:00:06 src/redis-sentinel *:26380 [sentinel] root 2961 2551 0 01:11 pts/2 00:00:06 src/redis-sentinel *:26381 [sentinel] root 3000 2551 0 01:50 pts/2 00:00:00 grep --color=auto redis
127.0.0.1:6379> info # Server # Clients # Memory # Persistence # Stats # Replication role:master connected_slaves:2 slave0:ip=127.0.0.1,port=6380,state=online,offset=544591,lag=0 slave1:ip=127.0.0.1,port=6381,state=online,offset=544591,lag=0 master_replid:541cd938f43b4f144e647881af409fa1884ea5a4 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:544857 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:544857 # CPU # Cluster # Keyspace
其他信息我都删掉了，只留下【Replication】的信息，其他信息可以在redis-cli 命令行中使用【info】命令查看
可以看到，6379是master角色，master下有两个从服务port=6380，port=6381
kill -9 2755
master被干掉了，所以master.log 没有日志，看其他两个从服务日志（截取部分）
redis_slave6380.log
///////////////////////////一分钟内 2780:S 29 Jul 01:58:53.414 # Connection with master lost. 2780:S 29 Jul 01:58:53.414 * Caching the disconnected master state. 2780:S 29 Jul 01:58:54.163 * Connecting to MASTER 127.0.0.1:6379 2780:S 29 Jul 01:58:54.163 * MASTER <-> SLAVE sync started 2780:S 29 Jul 01:58:54.164 # Error condition on socket for SYNC: Connection refused 2780:S 29 Jul 01:58:55.168 * Connecting to MASTER 127.0.0.1:6379 2780:S 29 Jul 01:58:55.169 * MASTER <-> SLAVE sync started .... ... ... 2780:S 29 Jul 01:59:22.381 # Error condition on socket for SYNC: Connection refused 2780:S 29 Jul 01:59:23.389 * Connecting to MASTER 127.0.0.1:6379 2780:S 29 Jul 01:59:23.389 * MASTER <-> SLAVE sync started 2780:S 29 Jul 01:59:23.389 # Error condition on socket for SYNC: Connection refused ///////////////////////////一分钟后 2780:S 29 Jul 01:59:24.321 * SLAVE OF 127.0.0.1:6381 enabled (user request from ‘id=8 addr=127.0.0.1:52556 fd=11 name=sentinel-4a6aebff-cmd age=3070 idle=0 flags=x db=0 sub=0 psub=0 multi=3 qbuf=133 qbuf-free=32635 obl=36 oll=0 omem=0 events=r cmd=exec‘) 2780:S 29 Jul 01:59:24.323 # CONFIG REWRITE executed with suc 2780:S 29 Jul 01:59:24.399 * Connecting to MASTER 127.0.0.1:6381 2780:S 29 Jul 01:59:24.399 * MASTER <-> SLAVE sync started 2780:S 29 Jul 01:59:24.399 * Non blocking connect for SYNC fired the event. 2780:S 29 Jul 01:59:24.399 * Master replied to PING, replication can continue... 2780:S 29 Jul 01:59:24.399 * Trying a partial resynchronization (request 541cd938f43b4f144e647881af409fa1884ea5a4:617714). 2780:S 29 Jul 01:59:24.400 * Successful partial resynchronization with master. 2780:S 29 Jul 01:59:24.400 # Master replication ID changed to 514edab0972b4b6e5388edc4f14fbdb4d223d39e 2780:S 29 Jul 01:59:24.400 * MASTER <-> SLAVE sync: Master accepted a Partial Resynchronization.
从01:58:53.414 到01:59:23.389 这一分钟内一直在尝试连接master，一分钟内没有连接成功后，sentinel 就会master判断为主观下线，看日志
Sentinel6379.log
//判定master 主观下线 2908:X 29 Jul 01:59:23.492 # +sdown master mymaster 127.0.0.1 6379 //当前的纪元（epoch）已经被更新。 2908:X 29 Jul 01:59:23.546 # +new-epoch 1 //开始给sentinel6380投票,谁来主导这次故障转移 2908:X 29 Jul 01:59:23.549 # +vote-for-leader 4a6aebffdd1301bf054e722c34e8a6611418ba8a 1 //判定master 客观观下线,已经有2个sentinel同意 2908:X 29 Jul 01:59:23.569 # +odown master mymaster 127.0.0.1 6379 #quorum 3/2 2908:X 29 Jul 01:59:23.569 # Next failover delay: I will not start a failover before Sun Jul 29 02:05:23 2018 2908:X 29 Jul 01:59:24.328 # +config-update-from sentinel 4a6aebffdd1301bf054e722c34e8a6611418ba8a 127.0.0.1 26380 @ mymaster 127.0.0.1 6379 2908:X 29 Jul 01:59:24.328 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6381 2908:X 29 Jul 01:59:24.328 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6381 2908:X 29 Jul 01:59:24.328 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381 2908:X 29 Jul 01:59:54.333 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
Sentinel6380.log
//判定master 主观下线 2937:X 29 Jul 01:59:23.459 # +sdown master mymaster 127.0.0.1 6379 //判定master 客观观下线,已经有2个sentinel同意 2937:X 29 Jul 01:59:23.536 # +odown master mymaster 127.0.0.1 6379 #quorum 2/2 2937:X 29 Jul 01:59:23.537 # +new-epoch 1 //尝试故障转移master 2937:X 29 Jul 01:59:23.537 # +try-failover master mymaster 127.0.0.1 6379 //开始给sentinel6380投票,谁来主导这次故障转移 2937:X 29 Jul 01:59:23.540 # +vote-for-leader 4a6aebffdd1301bf054e722c34e8a6611418ba8a 1 //其他两个sentinel 都投票给4a6aebffdd1301bf054e722c34e8a6611418ba8a 【6380sentinel】 2937:X 29 Jul 01:59:23.549 # 1db1a4dcdf0ecca00b64d9362c2a2dd338da0030 voted for 4a6aebffdd1301bf054e722c34e8a6611418ba8a 1 2937:X 29 Jul 01:59:23.549 # 1a77392638e41bb0ea0a865ffc93b8de6335227f voted for 4a6aebffdd1301bf054e722c34e8a6611418ba8a 1 //6379这个服务赢得选举可以进行故障转移 2937:X 29 Jul 01:59:23.619 # +elected-leader master mymaster 127.0.0.1 6379 //发现6379这个服务是故障转移状态，就开始选择master下得从服务 2937:X 29 Jul 01:59:23.619 # +failover-state-select-slave master mymaster 127.0.0.1 6379 //故障转移操作现在处于 select-slave 状态 —— Sentinel 正在寻找可以升级为主服务器的从服务器。(选择mymaster 127.0.0.1 6379 下 6381 的从服务) 2937:X 29 Jul 01:59:23.710 # +selected-slave slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379 //Sentinel 正在将6379下的从服务器6381升级为主服务器，等待升级功能完成。 2937:X 29 Jul 01:59:23.710 * +failover-state-send-slaveof-noone slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379 //master下的从服务 6381 等待升级 2937:X 29 Jul 01:59:23.769 * +failover-state-wait-promotion slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379 //升级master下从服务6381 2937:X 29 Jul 01:59:24.251 # +promoted-slave slave 127.0.0.1:6381 127.0.0.1 6381 @ mymaster 127.0.0.1 6379 //故障转移状态切换到了 reconf-slaves 状态。（再次确认从服务器转为主服务器） 2937:X 29 Jul 01:59:24.251 # +failover-state-reconf-slaves master mymaster 127.0.0.1 6379 //牵头的sentinel 向6380从服务器发送slaveof 指令，将它设置为新的master 2937:X 29 Jul 01:59:24.321 * +slave-reconf-sent slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 //6379不再处于客观下线状态，客观下线状态只用于master服务，6379已经不是master了 2937:X 29 Jul 01:59:24.653 # -odown master mymaster 127.0.0.1 6379 //6380服务正在将自己设置为6381主服务的从服务器，还未完成 2937:X 29 Jul 01:59:25.270 * +slave-reconf-inprog slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 //从服务器6380已经完成对新master服务的同步 2937:X 29 Jul 01:59:25.271 * +slave-reconf-done slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 //master6379 故障转移结束，所有的从服务器开始同步新的master 2937:X 29 Jul 01:59:25.347 # +failover-end master mymaster 127.0.0.1 6379 //配置变更主服务器的ip地址已经改变， 选择master 为6381 2937:X 29 Jul 01:59:25.347 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6381 //6381下的两个从服务（新的从服务被识别并关联） 2937:X 29 Jul 01:59:25.347 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6381 2937:X 29 Jul 01:59:25.347 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381 //添加master下从服务6379 为客观下线 2937:X 29 Jul 01:59:55.401 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
Sentinel6381.log
//判定master 主观下线
2961:X 29 Jul 01:59:23.459 # +sdown master mymaster 127.0.0.1 6379 2961:X 29 Jul 01:59:23.545 # +new-epoch 1
//开始给6380投票 2961:X 29 Jul 01:59:23.548 # +vote-for-leader 4a6aebffdd1301bf054e722c34e8a6611418ba8a 1 2961:X 29 Jul 01:59:24.325 # +config-update-from sentinel 4a6aebffdd1301bf054e722c34e8a6611418ba8a 127.0.0.1 26380 @ mymaster 127.0.0.1 6379 2961:X 29 Jul 01:59:24.325 # +switch-master mymaster 127.0.0.1 6379 127.0.0.1 6381 2961:X 29 Jul 01:59:24.325 * +slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6381 2961:X 29 Jul 01:59:24.325 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381 2961:X 29 Jul 01:59:54.348 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
可以看到在 01:59:23秒 也就是一分钟之后，三个监控master的sentinel 都判定了master为主观下线(sdown)，我们配置的至少有2个sentinel 同意master 主观下线，master就会被切换到客观下线(odown) 【+odown master mymaster 127.0.0.1 6379 #quorum 2/2】。当判断master为客观下线后，sentinel 就开始选举出新的master，可以看到Sentinel6380.log 日志要比其他的sentinel.log多，因为整个选举的过程是Sentinel6380 在牵头执行。
4：在6381下查看整个服务的备份状态
# Replication role:master connected_slaves:1 slave0:ip=127.0.0.1,port=6380,state=online,offset=1125775,lag=0 master_replid:514edab0972b4b6e5388edc4f14fbdb4d223d39e master_replid2:541cd938f43b4f144e647881af409fa1884ea5a4 master_repl_offset:1125775 second_repl_offset:617714 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:77200 repl_backlog_histlen:1048576
可以看到6381的角色成为了master，只有一个slave，因为另一个挂了。
5：再次启动6379服务
查看6379服务的日志
3037:S 29 Jul 02:46:47.753 # CONFIG REWRITE executed with success.
3037:S 29 Jul 02:46:48.359 * Connecting to MASTER 127.0.0.1:6381
3037:S 29 Jul 02:46:48.360 * MASTER <-> SLAVE sync started
3037:S 29 Jul 02:46:48.360 * Non blocking connect for SYNC fired the event.
3037:S 29 Jul 02:46:48.361 * Master replied to PING, replication can continue...
3037:S 29 Jul 02:46:48.362 * Trying a partial resynchronization (request 7b0dc6ac9c2188e3c92eb29eea200ea6c572619c:1).
3037:S 29 Jul 02:46:48.608 * Full resync from master: 514edab0972b4b6e5388edc4f14fbdb4d223d39e:1178142
3037:S 29 Jul 02:46:48.608 * Discarding previously cached master state.
3037:S 29 Jul 02:46:48.708 * MASTER <-> SLAVE sync: receiving 253 bytes from master
3037:S 29 Jul 02:46:48.708 * MASTER <-> SLAVE sync: Flushing old data
3037:S 29 Jul 02:46:48.708 * MASTER <-> SLAVE sync: Loading DB in memory
3037:S 29 Jul 02:46:48.708 * MASTER <-> SLAVE sync: Finished with success
3037:S 29 Jul 02:46:48.709 * Background append only file rewriting started by pid 3042
3037:S 29 Jul 02:46:48.750 * AOF rewrite child asks to stop sending diffs.
3042:C 29 Jul 02:46:48.750 * Parent agreed to stop sending diffs. Finalizing AOF...
3042:C 29 Jul 02:46:48.750 * Concatenating 0.00 MB of AOF diff received from parent.
3042:C 29 Jul 02:46:48.750 * SYNC append only file rewrite performed
3042:C 29 Jul 02:46:48.750 * AOF rewrite: 6 MB of memory used by copy-on-write
3037:S 29 Jul 02:46:48.781 * Background AOF rewrite terminated with success
3037:S 29 Jul 02:46:48.782 * Residual parent diff successfully flushed to the rewritten AOF (0.00 MB)
3037:S 29 Jul 02:46:48.782 * Background AOF rewrite finished successfully
看到启动后重写配置文件，然后自动连接6381这个新的master服务，开始从master 上全量同步数据
查看6381这个新master日志
//响应6379的同步请求
2809:M 29 Jul 02:46:48.362 * Slave 127.0.0.1:6379 asks for synchronization //不接受同步部分数据请求 2809:M 29 Jul 02:46:48.362 * Partial resynchronization not accepted: Replication ID mismatch (Slave asked for ‘7b0dc6ac9c2188e3c92eb29eea200ea6c572619c‘, my replication IDs are ‘514edab0972b4b6e5388edc4f14fbdb4d223d39e‘ and ‘541cd938f43b4f144e647881af409fa1884ea5a4‘) //开始同步 2809:M 29 Jul 02:46:48.362 * Starting BGSAVE for SYNC with target: disk 2809:M 29 Jul 02:46:48.607 * Background saving started by pid 3041 3041:C 29 Jul 02:46:48.607 * DB saved on disk #6m内存用于写复制 3041:C 29 Jul 02:46:48.608 * RDB: 6 MB of memory used by copy-on-write //后台保存成功 2809:M 29 Jul 02:46:48.708 * Background saving terminated with success 2809:M 29 Jul 02:46:48.708 * Synchronization with slave 127.0.0.1:6379 succeeded
查看sentinel日志
6379sentinel.log
//减去6379服务的主观下线状态 2908:X 29 Jul 02:46:37.610 # -sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381 //转换为master6381 下的从服务 2908:X 29 Jul 02:46:47.628 * +convert-to-slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
6380sentinel.log
2937:X 29 Jul 02:46:37.767 # -sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
6381sentinel.log
2961:X 29 Jul 02:46:38.023 # -sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 127.0.0.1 6381
再看下6381这个新master的整个备份信息
# Replication role:master connected_slaves:2 slave0:ip=127.0.0.1,port=6380,state=online,offset=1348132,lag=0 slave1:ip=127.0.0.1,port=6379,state=online,offset=1348132,lag=0 master_replid:514edab0972b4b6e5388edc4f14fbdb4d223d39e master_replid2:541cd938f43b4f144e647881af409fa1884ea5a4 master_repl_offset:1348132 second_repl_offset:617714 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:299557 repl_backlog_histlen:1048576
新的master 增加了一个slave6379 从服务
我们再搭建前做的redis配置，当故障转移成功后，这些配置会被重写，重写的内容基本都在配置文件的最后
Redis.conf配置文件，多了
# Generated by CONFIG REWRITE slaveof 127.0.0.1 6381
Redis6381.conf配置文件没有变
# Master-Slave replication. Use slaveof to make a Redis instance a copy of # slaveof <masterip> <masterport> slaveof 127.0.0.1 6381
新的master配置，也就是redis_slave6381.conf 已经没有了slaveof 配置
# Master-Slave replication. Use slaveof to make a Redis instance a copy of # slaveof <masterip> <masterport>
Sentinel.conf 也会发生变化，可以自己去看看
6：再次测试故障转移后的 同步功能
之前的master已经不再支持set
127.0.0.1:6379> set name zhangxs (error) READONLY You can‘t write against a read only slave.
新master set成功
127.0.0.1:6381> set name zhangxs OK
127.0.0.1:6379> get name "zhangxs"
127.0.0.1:6380> get name "zhangxs"
同步没问题。
转移后的服务器变成了
|
服务角色 |
端口 |
Redis.conf名称 |
sentinel配置文件名称 |
sentinel端口 |
redis日志路径 |
sentinel路劲 |
|
从(master) |
6379 |
redis.conf |
sentinel.conf |
26379 |
/home/zhangxs/data/redislog/redis_server/master.log |
/home/zhangxs/data/redislog/sentinel/sentinel6379.log |
|
从(slave) |
6380 |
redis_slave6380.conf |
Sentinel6380.conf |
26380 |
/home/zhangxs/data/redislog/redis_server/slave6380.log |
/home/zhangxs/data/redislog/sentinel/sentinel6380.log |
|
主(slave) |
6381 |
redis_slave6381.conf |
Sentinel6381.conf |
26381 |
/home/zhangxs/data/redislog/redis_server/slave6381.log |
/home/zhangxs/data/redislog/sentinel/sentinel6381.log |
参考文档：http://www.redis.cn/topics
标签：mod redis配置 nec after 修改端口号 orm 转换 mode his
原文地址：https://www.cnblogs.com/zhangXingSheng/p/9385885.html
