文章目錄

• • • • • 一、前置準備
        • • 啟動redis服務
          • 啟動sentinel服務
          • 查看sentiel啟動日志
        • 二、實戰故障轉移
        • • 2.1. 主節點停止
          • 2.2. Sentienl監控日志
          • 2.3. 節點信息監控
          • 2.4. 故障轉移后變化
          • 2.5. 重新啟動
          • 2.6. sentine日志
          • 2.7. 節點信息監控
          • 2.8. 配置文件變化
          • 2.9. 讀寫驗證

一、前置準備

啟動redis服務

# 查看redis進程 ps -ef |grep redis# 啟動redis服務 /usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf#查看主從節點信息 /usr/local/redis/bin/redis-cli -a 123456 info replication

啟動sentinel服務

聲明：在啟動3個redis服務的前提下，再依次啟動3個sentinel服務

/usr/local/redis/bin/redis-sentinel /usr/local/redis/conf/sentiel.conf

查看sentiel啟動日志

tail -f /usr/local/redis/log/sentinel.log

二、實戰故障轉移

2.1. 主節點停止

[root@bigdata01 redis-6.2.0]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replcation 127.0.0.1:6379> info replication # Replication role:master connected_slaves:2 slave0:ip=xxx.xxx.92.101,port=6379,state=online,offset=3xxx,lag=1 slave1:ip=xxx.xxx.92.102,port=6379,state=online,offset=3xxx,lag=1 master_failover_state:no-failover master_replid:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:3xxx second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:1778 127.0.0.1:6379> SHUTDOWN not connected>

2.2. Sentienl監控日志

mymaster 主節點 xxx.xxx.92.100 6379 被添加主觀下線標記，其他的sentinel每秒一次和xxx.xxx.92.100 6379的通信 # +sdown master mymaster xxx.xxx.92.100 6379 啟動一個新選舉流程，記錄當前選舉的次數 # +new-epoch 1 投票選舉一個sentinel去做故障轉移這件事 # +vote-for-leader a20913bfcbeb3a5d8d58ce1bd372cc40455xxx10 1 客觀下線：當前環境內多個sentinel節點對我們的某一個服務器標記為主觀下線，滿足quorum 仲裁的選項值之后，標記為客觀下線 # +odown master mymaster xxx.xxx.92.100 6379 #quorum 3/2 # Next failover delay: I will not start a failover before Sun Jul 4 22:39:56 2021 # +config-update-from sentinel a20913bfcbeb3a5d8d58ce1bd372cc40455xxx10 xxx.xxx.92.1026379 # +switch-master mymaster xxx.xxx.92.100 6379 xxx.xxx.92.101 6379 * +slave slave xxx.xxx.92.102:6379 xxx.xxx.92.102 6379 @ mymaster xxx.xxx.92.101 6379 * +slave slave xxx.xxx.92.100:6379 xxx.xxx.92.100 6379 @ mymaster xxx.xxx.92.101 6379 # +sdown slave xxx.xxx.92.100:6379 xxx.xxx.92.100 6379 @ mymaster xxx.xxx.92.101 6379

2.3. 節點信息監控

查看故障轉移后的節點信息
01節點信息

[root@bigdata02 ~]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.100 master_port:6379 master_link_status:up master_last_io_seconds_ago:6 master_sync_in_progress:0 slave_repl_offset:3196 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:3196 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:1806# 故障轉移后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:master connected_slaves:1 slave0:ip=xxx.xxx.92.102,port=6379,state=online,offset=380674,lag=1 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:380674 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:379284 127.0.0.1:6379>

02節點信息

[root@bigdata03 ~]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.100 master_port:6379 master_link_status:up master_last_io_seconds_ago:4 master_sync_in_progress:0 slave_repl_offset:3210 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:3210 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1433 repl_backlog_histlen:1778# 故障轉移后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.101 master_port:6379 master_link_status:up master_last_io_seconds_ago:0 master_sync_in_progress:0 slave_repl_offset:381546 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:381546 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1433 repl_backlog_histlen:380114 127.0.0.1:6379>

2.4. 故障轉移后變化

01節點由slave節點變成了master節點，02仍然后slave節點

2.5. 重新啟動

故障的 100節點(原主節點)重新啟動

/usr/local/redis/bin/redis-server /usr/local/redis/conf/redis.conf

2.6. sentine日志

* +convert-to-slave slave xxx.xxx.92.100:6379 xxx.xxx.92.100 6379 @ mymaster xxx.xxx.92.101 6379

2.7. 節點信息監控

[root@bigdata01 redis-6.2.0]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.101 master_port:6379 master_link_status:up master_last_io_seconds_ago:0 master_sync_in_progress:0 slave_repl_offset:528510 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:528510 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:518136 repl_backlog_histlen:10375 127.0.0.1:6379>

01節點信息

[root@bigdata02 ~]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.100 master_port:6379 master_link_status:up master_last_io_seconds_ago:6 master_sync_in_progress:0 slave_repl_offset:3196 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:3196 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:1806# 故障轉移后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:master connected_slaves:1 slave0:ip=xxx.xxx.92.102,port=6379,state=online,offset=380674,lag=1 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:380674 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:379284#原主節點重新啟動后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:master connected_slaves:2 slave0:ip=xxx.xxx.92.102,port=6379,state=online,offset=537589,lag=1 slave1:ip=xxx.xxx.92.100,port=6379,state=online,offset=537732,lag=0 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:537875 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1391 repl_backlog_histlen:536485 127.0.0.1:6379>

02節點信息

[root@bigdata03 ~]# /usr/local/redis/bin/redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.100 master_port:6379 master_link_status:up master_last_io_seconds_ago:4 master_sync_in_progress:0 slave_repl_offset:3210 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:3210 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1433 repl_backlog_histlen:1778# 故障轉移后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.101 master_port:6379 master_link_status:up master_last_io_seconds_ago:0 master_sync_in_progress:0 slave_repl_offset:381546 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:381546 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1433 repl_backlog_histlen:380114#原主節點重新啟動后 ------------------------------------------------------------------- 127.0.0.1:6379> info replication # Replication role:slave master_host:xxx.xxx.92.101 master_port:6379 master_link_status:up master_last_io_seconds_ago:0 master_sync_in_progress:0 slave_repl_offset:556005 slave_priority:100 slave_read_only:1 connected_slaves:0 master_failover_state:no-failover master_replid:424069affa171e62af3e2c65a2ee1cb27ecb6c2f master_replid2:4f07bacde969998356194ad698c6dd7e2f6f7da2 master_repl_offset:556005 second_repl_offset:156702 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1433 repl_backlog_histlen:554573 127.0.0.1:6379>

2.8. 配置文件變化

原100主節點

# 放行訪問IP的限制 多個用空格隔開 # 0.0.0.0 代表無限制 bind 0.0.0.0# 后臺啟動開啟 daemonize yes# 日志存儲目錄以及日志文件名 logfile "/usr/local/redis/log/redis.log"# rdb數據文件名 dbfilename "dump.rdb"# aof模式開啟 appendonly no# aof數據文件名 appendfilename "appendonly.aof"#rdb數據文件和aof數據文件存儲目錄 dir "/usr/local/redis/data"# 設置密碼 requirepass 123456# 從節點訪問主節點的密碼(必須和requirepass 一致) masterauth "123456"#從節點只讀模式 replica-read-only yes # Generated by CONFIG REWRITE pidfile "/var/run/redis.pid" save 3600 1 save 300 100 save 60 10000 user default on #8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92 ~* &* +@all replicaof xxx.xxx.92.101 6379

變化：最下面添加了主節點信息

原01節點

# 放行訪問IP的限制 多個用空格隔開 # 0.0.0.0 代表無限制 bind 0.0.0.0# 后臺啟動開啟 daemonize yes# 日志存儲目錄以及日志文件名 logfile "/usr/local/redis/log/redis.log"# rdb數據文件名 dbfilename "dump.rdb"# aof模式開啟 appendonly no# aof數據文件名 appendfilename "appendonly.aof"#rdb數據文件和aof數據文件存儲目錄 dir "/usr/local/redis/data"# 設置密碼 requirepass 123456# 從節點訪問主節點的密碼(必須和requirepass 一致) masterauth "123456"#從節點只讀模式 replica-read-only yes# 從節點從屬于那個主節點# Generated by CONFIG REWRITE pidfile "/var/run/redis.pid" save 3600 1 save 300 100 save 60 10000 user default on #8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92 ~* &* +@all

變化：原來配置的主節點信息沒了

02節點信息

# 放行訪問IP的限制 多個用空格隔開 # 0.0.0.0 代表無限制 bind 0.0.0.0# 后臺啟動開啟 daemonize yes# 日志存儲目錄以及日志文件名 logfile "/usr/local/redis/log/redis.log"# rdb數據文件名 dbfilename "dump.rdb"# aof模式開啟 appendonly no# aof數據文件名 appendfilename "appendonly.aof"#rdb數據文件和aof數據文件存儲目錄 dir "/usr/local/redis/data"# 設置密碼 requirepass 123456# 從節點訪問主節點的密碼(必須和requirepass 一致) masterauth "123456"#從節點只讀模式 replica-read-only yes# 從節點從屬于那個主節點 replicaof xxx.xxx.92.101 6379 # Generated by CONFIG REWRITE pidfile "/var/run/redis.pid" save 3600 1 save 300 100 save 60 10000 user default on #8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92 ~* &* +@all

2.9. 讀寫驗證

# 登陸redis客戶端 /usr/local/redis/bin/redis-cli --user default --pass 123456 #故障轉移后的100機器現在為slave節點，可讀不可寫 [root@bigdata01 redis-6.2.0]# /usr/local/redis/bin/redis-cli --user default --pass 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> set name lisi (error) READONLY You can't write against a read only replica. 127.0.0.1:6379> #故障轉移后的101機器現在為master節點，可以讀寫 [root@bigdata02 ~]# /usr/local/redis/bin/redis-cli --user default --pass 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> set name lisi OK 127.0.0.1:6379> get name "lisi" 127.0.0.1:6379> #故障轉移后的102機器現在為slave節點，可讀不可寫 [root@bigdata03 ~]# /usr/local/redis/bin/redis-cli --user default --pass 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> set name wangwu (error) READONLY You can't write against a read only replica. 127.0.0.1:6379> get name "lisi" 127.0.0.1:6379>

總結

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