MHA手动在线切换主 原创3（主不参与复制)

monitor

执行：slave2连接到slave1,server1 不做(主/从复制角色,停在那里)

[root@monitor app1]# masterha_master_switch --conf=/etc/masterha/app1.conf --master_state=alive --new_master_host=slave1
Mon May  ::  - [info] MHA::MasterRotate version 0.56.
Mon May  ::  - [info] Starting online master switch..
Mon May  ::  - [info]
Mon May  ::  - [info] * Phase : Configuration Check Phase..
Mon May  ::  - [info]
Mon May  ::  - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Mon May  ::  - [info] Reading application default configuration from /etc/masterha/app1.conf..
Mon May  ::  - [info] Reading server configuration from /etc/masterha/app1.conf..
Mon May  ::  - [debug] Connecting to servers..
Mon May  ::  - [debug]  Connected to: server1(10.24.220.232:), user=root
Mon May  ::  - [debug]  Number of slave worker threads on host server1(10.24.220.232:):
Mon May  ::  - [debug]  Connected to: slave1(10.24.220.70:), user=root
Mon May  ::  - [debug]  Number of slave worker threads on host slave1(10.24.220.70:):
Mon May  ::  - [debug]  Connected to: slave2(10.169.214.33:), user=root
Mon May  ::  - [debug]  Number of slave worker threads on host slave2(10.169.214.33:):
Mon May  ::  - [debug]  Comparing MySQL versions..
Mon May  ::  - [debug]   Comparing MySQL versions done.
Mon May  ::  - [debug] Connecting to servers done.
Mon May  ::  - [info] GTID failover mode =
Mon May  ::  - [info] Current Alive Master: server1(10.24.220.232:)
Mon May  ::  - [info] Alive Slaves:
Mon May  ::  - [info]   slave1(10.24.220.70:)  Version=5.7.-log (oldest major version between slaves) log-bin:enabled
Mon May  ::  - [info]     GTID ON
Mon May  ::  - [debug]    Relay log info repository: FILE
Mon May  ::  - [info]     Replicating from 10.24.220.232(10.24.220.232:)
Mon May  ::  - [info]     Primary candidate for the new Master (candidate_master is set)
Mon May  ::  - [info]   slave2(10.169.214.33:)  Version=5.7.-log (oldest major version between slaves) log-bin:enabled
Mon May  ::  - [info]     GTID ON
Mon May  ::  - [debug]    Relay log info repository: FILE
Mon May  ::  - [info]     Replicating from 10.24.220.232(10.24.220.232:)
Mon May  ::  - [info]     Not candidate for the new Master (no_master is set)

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on server1(10.24.220.232:)? (YES/no): yes
Mon May  ::  - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] Checking MHA is not monitoring or doing failover..
Mon May  ::  - [info] Checking replication health on slave1..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] Checking replication health on slave2..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] slave1 can be new master.
Mon May  ::  - [info]
From:
server1(10.24.220.232:) (current master)
 +--slave1(10.24.220.70:)
 +--slave2(10.169.214.33:)

To:
slave1(10.24.220.70:) (new master)
 +--slave2(10.169.214.33:)

Starting master switch from server1(10.24.220.232:) to slave1(10.24.220.70:)? (yes/NO): yes
Mon May  ::  - [info] Checking whether slave1(10.24.220.70:) is ok for the new master..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] ** Phase : Configuration Check Phase completed.
Mon May  ::  - [info]
Mon May  ::  - [debug]  Disconnected from server1(10.24.220.232:)
Mon May  ::  - [info] * Phase : Rejecting updates Phase..
Mon May  ::  - [info]
master_ip_online_change_script is not defined. If you do not disable writes on the current master manually, applications keep writing on the current master. Is it ok to proceed? (yes/NO): yes
Mon May  ::  - [info] Locking all tables on the orig master to reject updates from everybody (including root):
Mon May  ::  - [info] Executing FLUSH TABLES WITH READ LOCK..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] Orig master binlog:pos is log.:.
Mon May  ::  - [debug] Fetching current slave status..
Mon May  ::  - [debug]  Fetching current slave status done.
Mon May  ::  - [info]  Waiting to execute all relay logs on slave1(10.24.220.70:)..
Mon May  ::  - [info]  master_pos_wait(log.:) completed on slave1(10.24.220.70:). Executed  events.
Mon May  ::  - [info]   done.
Mon May  ::  - [debug]  Stopping SQL thread on slave1(10.24.220.70:)..
Mon May  ::  - [debug]   done.
Mon May  ::  - [info] Getting new master's binlog name and position..
Mon May  ::  - [info]  log.:
Mon May  ::  - [info]  All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='slave1 or 10.24.220.70', MASTER_PORT=, MASTER_AUTO_POSITION=, MASTER_USER='repl', MASTER_PASSWORD='xxx';
Mon May  ::  - [info] Setting read_only= on slave1(10.24.220.70:)..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info]
Mon May  ::  - [info] * Switching slaves in parallel..
Mon May  ::  - [info]
Mon May  ::  - [info] -- Slave switch on host slave2(10.169.214.33:) started, pid:
Mon May  ::  - [info]
Mon May  ::  - [info] Log messages from slave2 ...
Mon May  ::  - [info]
Mon May  ::  - [info]  Waiting to execute all relay logs on slave2(10.169.214.33:)..
Mon May  ::  - [info]  master_pos_wait(log.:) completed on slave2(10.169.214.33:). Executed  events.
Mon May  ::  - [info]   done.
Mon May  ::  - [debug]  Stopping SQL thread on slave2(10.169.214.33:)..
Mon May  ::  - [debug]   done.
Mon May  ::  - [info]  Resetting slave slave2(10.169.214.33:) and starting replication from the new master slave1(10.24.220.70:)..
Mon May  ::  - [debug]  Stopping slave IO/SQL thread on slave2(10.169.214.33:)..
Mon May  ::  - [debug]   done.
Mon May  ::  - [info]  Executed CHANGE MASTER.
Mon May  ::  - [debug]  Starting slave IO/SQL thread on slave2(10.169.214.33:)..
Mon May  ::  - [debug]   done.
Mon May  ::  - [info]  Slave started.
Mon May  ::  - [info] End of log messages from slave2 ...
Mon May  ::  - [info]
Mon May  ::  - [info] -- Slave switch on host slave2(10.169.214.33:) succeeded.
Mon May  ::  - [info] Unlocking all tables on the orig master:
Mon May  ::  - [info] Executing UNLOCK TABLES..
Mon May  ::  - [info]  ok.
Mon May  ::  - [info] All new slave servers switched successfully.
Mon May  ::  - [info]
Mon May  ::  - [info] * Phase : New master cleanup phase..
Mon May  ::  - [info]
Mon May  ::  - [debug]  Clearing slave info..
Mon May  ::  - [debug]  Stopping slave IO/SQL thread on slave1(10.24.220.70:)..
Mon May  ::  - [debug]   done.
Mon May  ::  - [debug]  SHOW SLAVE STATUS shows new master does not replicate from anywhere. OK.
Mon May  ::  - [info]  slave1: Resetting slave info succeeded.
Mon May  ::  - [info] Switching master to slave1(10.24.220.70:) completed successfully.
Mon May  ::  - [debug]  Disconnected from server1(10.24.220.232:)
Mon May  ::  - [debug]  Disconnected from slave1(10.24.220.70:)
Mon May  ::  - [debug]  Disconnected from slave2(10.169.214.33:)
[root@monitor app1]# 

slave1 :上执行

mysql> show variables like "read_only";
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| read_only | OFF |
+---------------+-------+
1 row in set (0.00 sec)

注意已经由只读变为可写！！！！！！！！！

server1 没有变化,还是 read_only=OFF

在反复切换实验时注意读写状态