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这篇文章主要讲解了“MySQL5.7一主两从MHA自动切换”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“MySQL5.7一主两从MHA自动切换”吧!
数据库架构:一主两从
master:192.168.8.57
slave1:192.168.8.58
slave2:192.168.8.59
manager:192.168.8.60
MHA工具包:
mha4mysql-manager-0.58.tar.gz
mha4mysql-node-0.58.tar.gz
一、master添加vip
/sbin/ifconfig enp0s3:1 192.168.8.88/24
ifconfig enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.8.57 netmask 255.255.255.0 broadcast 192.168.8.255 inet6 fe80::5198:593b:cdc5:1f90 prefixlen 64 scopeid 0x20<link> ether 08:00:27:c0:45:0d txqueuelen 1000 (Ethernet) RX packets 72386 bytes 9442794 (9.0 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 24221 bytes 2963104 (2.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp0s3:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.8.88 netmask 255.255.255.0 broadcast 192.168.8.255 ether 08:00:27:c0:45:0d txqueuelen 1000 (Ethernet) lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 84 bytes 9492 (9.2 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 84 bytes 9492 (9.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:f4:55:bb txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
二、failover 自动切换测试
1.手动停止master的MySQL进程
mysqladmin -uroot -pmysql shutdown
2.查看manager日志
[root@manager bin]# tail -f /var/log/masterha/app1/manager.log Thu Oct 25 19:34:53 2018 - [warning] Got error on MySQL select ping: 2006 (MySQL server has gone away) Thu Oct 25 19:34:53 2018 - [info] Executing SSH check script: exit 0 Thu Oct 25 19:34:53 2018 - [info] Executing secondary network check script: /usr/local/bin/masterha_secondary_check -s 192.168.8.58 -s 192.168.8.59 --user=root --master_host=192.168.8.57 --master_ip=192.168.8.57 --master_port=3306 --master_user=root --master_password=mysql --ping_type=SELECT Thu Oct 25 19:34:53 2018 - [info] HealthCheck: SSH to 192.168.8.57 is reachable. Monitoring server 192.168.8.58 is reachable, Master is not reachable from 192.168.8.58. OK. Thu Oct 25 19:34:54 2018 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.8.57' (111)) Thu Oct 25 19:34:54 2018 - [warning] Connection failed 2 time(s).. Monitoring server 192.168.8.59 is reachable, Master is not reachable from 192.168.8.59. OK. Thu Oct 25 19:34:54 2018 - [info] Master is not reachable from all other monitoring servers. Failover should start. Thu Oct 25 19:34:55 2018 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.8.57' (111)) Thu Oct 25 19:34:55 2018 - [warning] Connection failed 3 time(s).. Thu Oct 25 19:34:56 2018 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.8.57' (111)) Thu Oct 25 19:34:56 2018 - [warning] Connection failed 4 time(s).. Thu Oct 25 19:34:56 2018 - [warning] Master is not reachable from health checker! Thu Oct 25 19:34:56 2018 - [warning] Master 192.168.8.57(192.168.8.57:3306) is not reachable! Thu Oct 25 19:34:56 2018 - [warning] SSH is reachable. Thu Oct 25 19:34:56 2018 - [info] Connecting to a master server failed. Reading configuration file /etc/masterha_default.cnf and /etc/masterha/app1.cnf again, and trying to connect to all servers to check server status.. Thu Oct 25 19:34:56 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Thu Oct 25 19:34:56 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Thu Oct 25 19:34:56 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Thu Oct 25 19:34:57 2018 - [info] GTID failover mode = 1 Thu Oct 25 19:34:57 2018 - [info] Dead Servers: Thu Oct 25 19:34:57 2018 - [info] 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:57 2018 - [info] Alive Servers: Thu Oct 25 19:34:57 2018 - [info] 192.168.8.58(192.168.8.58:3306) Thu Oct 25 19:34:57 2018 - [info] 192.168.8.59(192.168.8.59:3306) Thu Oct 25 19:34:57 2018 - [info] Alive Slaves: Thu Oct 25 19:34:57 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:57 2018 - [info] GTID ON Thu Oct 25 19:34:57 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:57 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 19:34:57 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:57 2018 - [info] GTID ON Thu Oct 25 19:34:57 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:57 2018 - [info] Checking slave configurations.. Thu Oct 25 19:34:57 2018 - [info] Checking replication filtering settings.. Thu Oct 25 19:34:57 2018 - [info] Replication filtering check ok. Thu Oct 25 19:34:57 2018 - [info] Master is down! Thu Oct 25 19:34:57 2018 - [info] Terminating monitoring script. Thu Oct 25 19:34:57 2018 - [info] Got exit code 20 (Master dead). Thu Oct 25 19:34:57 2018 - [info] MHA::MasterFailover version 0.58. Thu Oct 25 19:34:57 2018 - [info] Starting master failover. Thu Oct 25 19:34:57 2018 - [info] Thu Oct 25 19:34:57 2018 - [info] * Phase 1: Configuration Check Phase.. Thu Oct 25 19:34:57 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] GTID failover mode = 1 Thu Oct 25 19:34:58 2018 - [info] Dead Servers: Thu Oct 25 19:34:58 2018 - [info] 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Checking master reachability via MySQL(double check)... Thu Oct 25 19:34:58 2018 - [info] ok. Thu Oct 25 19:34:58 2018 - [info] Alive Servers: Thu Oct 25 19:34:58 2018 - [info] 192.168.8.58(192.168.8.58:3306) Thu Oct 25 19:34:58 2018 - [info] 192.168.8.59(192.168.8.59:3306) Thu Oct 25 19:34:58 2018 - [info] Alive Slaves: Thu Oct 25 19:34:58 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 19:34:58 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Starting GTID based failover. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] ** Phase 1: Configuration Check Phase completed. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 2: Dead Master Shutdown Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] Forcing shutdown so that applications never connect to the current master.. Thu Oct 25 19:34:58 2018 - [info] Executing master IP deactivation script: Thu Oct 25 19:34:58 2018 - [info] /usr/local/bin/master_ip_failover --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --command=stopssh --ssh_user=root Thu Oct 25 19:34:58 2018 - [info] done. Thu Oct 25 19:34:58 2018 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master. Thu Oct 25 19:34:58 2018 - [info] * Phase 2: Dead Master Shutdown Phase completed. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 3: Master Recovery Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 3.1: Getting Latest Slaves Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] The latest binary log file/position on all slaves is mysql-bin.000010:707 Thu Oct 25 19:34:58 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:7-9 Thu Oct 25 19:34:58 2018 - [info] Latest slaves (Slaves that received relay log files to the latest): Thu Oct 25 19:34:58 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 19:34:58 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] The oldest binary log file/position on all slaves is mysql-bin.000010:707 Thu Oct 25 19:34:58 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:7-9 Thu Oct 25 19:34:58 2018 - [info] Oldest slaves: Thu Oct 25 19:34:58 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 19:34:58 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 3.3: Determining New Master Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] Searching new master from slaves.. Thu Oct 25 19:34:58 2018 - [info] Candidate masters from the configuration file: Thu Oct 25 19:34:58 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 19:34:58 2018 - [info] GTID ON Thu Oct 25 19:34:58 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Thu Oct 25 19:34:58 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 19:34:58 2018 - [info] Non-candidate masters: Thu Oct 25 19:34:58 2018 - [info] Searching from candidate_master slaves which have received the latest relay log events.. Thu Oct 25 19:34:58 2018 - [info] New master is 192.168.8.58(192.168.8.58:3306) Thu Oct 25 19:34:58 2018 - [info] Starting master failover.. Thu Oct 25 19:34:58 2018 - [info] From: 192.168.8.57(192.168.8.57:3306) (current master) +--192.168.8.58(192.168.8.58:3306) +--192.168.8.59(192.168.8.59:3306) To: 192.168.8.58(192.168.8.58:3306) (new master) +--192.168.8.59(192.168.8.59:3306) Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 3.3: New Master Recovery Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] Waiting all logs to be applied.. Thu Oct 25 19:34:58 2018 - [info] done. Thu Oct 25 19:34:58 2018 - [info] Getting new master's binlog name and position.. Thu Oct 25 19:34:58 2018 - [info] mysql-bin.000010:747 Thu Oct 25 19:34:58 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.8.58', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='xxx'; Thu Oct 25 19:34:58 2018 - [info] Master Recovery succeeded. File:Pos:Exec_Gtid_Set: mysql-bin.000010, 747, a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-4 Thu Oct 25 19:34:58 2018 - [info] Executing master IP activate script: Thu Oct 25 19:34:58 2018 - [info] /usr/local/bin/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --new_master_host=192.168.8.58 --new_master_ip=192.168.8.58 --new_master_port=3306 --new_master_user='root' --new_master_password=xxx Undefined subroutine &main::FIXME_xxx_create_user called at /usr/local/bin/master_ip_failover line 94. Set read_only=0 on the new master. Creating app user on the new master.. Thu Oct 25 19:34:58 2018 - [error][/usr/lib/perl5/vendor_perl/MHA/MasterFailover.pm, ln1612] Failed to activate master IP address for 192.168.8.58(192.168.8.58:3306) with return code 10:0 Thu Oct 25 19:34:58 2018 - [warning] Proceeding. Thu Oct 25 19:34:58 2018 - [info] ** Finished master recovery successfully. Thu Oct 25 19:34:58 2018 - [info] * Phase 3: Master Recovery Phase completed. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 4: Slaves Recovery Phase.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] * Phase 4.1: Starting Slaves in parallel.. Thu Oct 25 19:34:58 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] -- Slave recovery on host 192.168.8.59(192.168.8.59:3306) started, pid: 20757. Check tmp log /var/log/masterha/app1/192.168.8.59_3306_20181025193457.log if it takes time.. Thu Oct 25 19:34:59 2018 - [info] Thu Oct 25 19:34:59 2018 - [info] Log messages from 192.168.8.59 ... Thu Oct 25 19:34:59 2018 - [info] Thu Oct 25 19:34:58 2018 - [info] Resetting slave 192.168.8.59(192.168.8.59:3306) and starting replication from the new master 192.168.8.58(192.168.8.58:3306).. Thu Oct 25 19:34:58 2018 - [info] Executed CHANGE MASTER. Thu Oct 25 19:34:58 2018 - [info] Slave started. Thu Oct 25 19:34:58 2018 - [info] gtid_wait(a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-4) completed on 192.168.8.59(192.168.8.59:3306). Executed 0 events. Thu Oct 25 19:34:59 2018 - [info] End of log messages from 192.168.8.59. Thu Oct 25 19:34:59 2018 - [info] -- Slave on host 192.168.8.59(192.168.8.59:3306) started. Thu Oct 25 19:34:59 2018 - [info] All new slave servers recovered successfully. Thu Oct 25 19:34:59 2018 - [info] Thu Oct 25 19:34:59 2018 - [info] * Phase 5: New master cleanup phase.. Thu Oct 25 19:34:59 2018 - [info] Thu Oct 25 19:34:59 2018 - [info] Resetting slave info on the new master.. Thu Oct 25 19:35:00 2018 - [info] 192.168.8.58: Resetting slave info succeeded. Thu Oct 25 19:35:00 2018 - [info] Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully. Thu Oct 25 19:35:00 2018 - [info] Deleted server1 entry from /etc/masterha/app1.cnf . Thu Oct 25 19:35:00 2018 - [info] ----- Failover Report ----- app1: MySQL Master failover 192.168.8.57(192.168.8.57:3306) to 192.168.8.58(192.168.8.58:3306) succeeded Master 192.168.8.57(192.168.8.57:3306) is down! Check MHA Manager logs at manager:/var/log/masterha/app1/manager.log for details. Started automated(non-interactive) failover. Invalidated master IP address on 192.168.8.57(192.168.8.57:3306) Selected 192.168.8.58(192.168.8.58:3306) as a new master. 192.168.8.58(192.168.8.58:3306): OK: Applying all logs succeeded. Failed to activate master IP address for 192.168.8.58(192.168.8.58:3306) with return code 10:0 192.168.8.59(192.168.8.59:3306): OK: Slave started, replicating from 192.168.8.58(192.168.8.58:3306) 192.168.8.58(192.168.8.58:3306): Resetting slave info succeeded. Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully. Thu Oct 25 19:35:00 2018 - [info] Sending mail..
日志中显示主库已经切换,新的主库为192.168.8.58
3.查看主机192.168.8.58和192.168.8.59的信息
192.168.8.58
mysql> show slave status \G Empty set (0.00 sec) mysql> show master status \G *************************** 1. row *************************** File: mysql-bin.000010 Position: 747 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-4 1 row in set (0.00 sec)
mysql> show variables like 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | OFF | +---------------+-------+
192.168.8.59
mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.8.58 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000010 Read_Master_Log_Pos: 747 Relay_Log_File: slave2-relay-bin.000002 Relay_Log_Pos: 414 Relay_Master_Log_File: mysql-bin.000010 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 747 Relay_Log_Space: 622 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 58 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450f Master_Info_File: /mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450b:1-4, a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-4 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version:
mysql> show variables like 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | ON | +---------------+-------+
可以看到192.168.8.58变成了新的主库,read_only变成了OFF,192.168.8.59作为192.168.8.58的从库,read_only依然为ON。
4.主从数据测试
在192.168.8.58创建表t7
mysql> create table t7(id int(6)); Query OK, 0 rows affected (0.04 sec) mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | +----------------+
在192.168.8.59进行查看
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | +----------------+
可以看到新的主从复制正常。
5.切换完之后你会发现 MHA Manager 监控程序会自动死掉,官网有如下解释和解决方式:
Running MHA Manager from daemontools
Currently MHA Manager process does not run as a daemon. if failover completed
successfully or the master process was killed by accident, the manager stops
working. to run as a daemon, daemontool. or any external daemon program
can be used. Here is an example to run from daemontools.
解决方法:
vi /usr/local/bin/manager_status_check #!/bin/bash while : do MGECHECK=`ps -ef|grep masterha_manager |egrep -v grep| wc -l` if [ $MGECHECK -eq 0 ];then /usr/local/bin/masterha_start.sh else echo "MHA manager start" fi sleep 5 done
chmod u+x /usr/local/bin/manager_status_check nohup /usr/local/bin/manager_status_check &
写入/etc/rc.d/rc.local 开机自动启动
echo "nohup /usr/local/bin/manager_status_check &" >> /etc/rc.d/rc.local
6.原主库加入MHA
首先修改旧主库 192.168.8.57 的参数 my.cnf,打开从库相关的参数,要重启.
方法一:由于有GTID,我们可以直接就 change master 切换过去
对比一下数据
192.168.8.57
mysql> use test Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | +----------------+
192.168.8.58
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | +----------------+
旧主库直接 change master to
mysql> change master to -> master_host='192.168.8.58', -> master_port=3306, -> master_user='repl', -> master_password='mysql', -> master_auto_position=1; Query OK, 0 rows affected, 2 warnings (0.05 sec)
查看192.168.8.57slave进程状态
mysql> start slave; Query OK, 0 rows affected (0.07 sec) mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.8.58 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000010 Read_Master_Log_Pos: 912 Relay_Log_File: master-relay-bin.000007 Relay_Log_Pos: 619 Relay_Master_Log_File: mysql-bin.000010 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 912 Relay_Log_Space: 1080 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 58 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450f Master_Info_File: /mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450f:1-5 Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-5 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec)
可以看到slave进程已经启动,新的主库为192.168.8.58
设置192.168.8.57参数read_only=1
mysql> set global read_only=1; Query OK, 0 rows affected (0.00 sec) mysql> show variables like 'read_only'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | read_only | ON | +---------------+-------+
查看192.168.8.57数据复制情况
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | +----------------+
可以看到此时t7已经复制成功。
方法二:
若修复原主库耗费时间较长,建议重新初始化192.168.8.57从库,而非使用change master to
7.修改MHA配置文件
此时发现MHA配置文件app1.cnf出现缺失
[server default] manager_log=/var/log/masterha/app1/manager.log manager_workdir=/var/log/masterha/app1 master_binlog_dir=/mysql/data master_ip_failover_script=/usr/local/bin/master_ip_failover master_ip_online_change_script=/usr/local/bin/master_ip_online_change password=mysql ping_interval=1 remote_workdir=/tmp repl_password=mysql repl_user=repl report_script=/usr/local/bin/send_report secondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.8.58 -s 192.168.8.59 shutdown_script="" ssh_user=root user=root [server2] candidate_master=1 check_repl_delay=0 hostname=192.168.8.58 port=3306 [server3] hostname=192.168.8.59 port=3306
完善之后如下:
[server default] manager_log=/var/log/masterha/app1/manager.log manager_workdir=/var/log/masterha/app1 master_binlog_dir=/mysql/data master_ip_failover_script=/usr/local/bin/master_ip_failover master_ip_online_change_script=/usr/local/bin/master_ip_online_change password=mysql ping_interval=1 remote_workdir=/tmp repl_password=mysql repl_user=repl report_script=/usr/local/bin/send_report secondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.8.57 -s 192.168.8.59 shutdown_script="" ssh_user=root user=root [server1] candidate_master=1 check_repl_delay=0 hostname=192.168.8.57 port=3306 [server2] hostname=192.168.8.58 port=3306 [server3] hostname=192.168.8.59 port=3306
8.重启监控程序
MHA复制健康检查
./masterha_check_repl --conf=/etc/masterha/app1.cnf Thu Oct 25 20:32:04 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Thu Oct 25 20:32:04 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Thu Oct 25 20:32:04 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Thu Oct 25 20:32:04 2018 - [info] MHA::MasterMonitor version 0.58. Thu Oct 25 20:32:05 2018 - [info] GTID failover mode = 1 Thu Oct 25 20:32:05 2018 - [info] Dead Servers: Thu Oct 25 20:32:05 2018 - [info] Alive Servers: Thu Oct 25 20:32:05 2018 - [info] 192.168.8.57(192.168.8.57:3306) Thu Oct 25 20:32:05 2018 - [info] 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:32:05 2018 - [info] 192.168.8.59(192.168.8.59:3306) Thu Oct 25 20:32:05 2018 - [info] Alive Slaves: Thu Oct 25 20:32:05 2018 - [info] 192.168.8.57(192.168.8.57:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 20:32:05 2018 - [info] GTID ON Thu Oct 25 20:32:05 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:32:05 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 20:32:05 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 20:32:05 2018 - [info] GTID ON Thu Oct 25 20:32:05 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:32:05 2018 - [info] Current Alive Master: 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:32:05 2018 - [info] Checking slave configurations.. Thu Oct 25 20:32:05 2018 - [info] Checking replication filtering settings.. Thu Oct 25 20:32:05 2018 - [info] binlog_do_db= , binlog_ignore_db= Thu Oct 25 20:32:05 2018 - [info] Replication filtering check ok. Thu Oct 25 20:32:05 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Thu Oct 25 20:32:05 2018 - [info] Checking SSH publickey authentication settings on the current master.. Thu Oct 25 20:32:05 2018 - [info] HealthCheck: SSH to 192.168.8.58 is reachable. Thu Oct 25 20:32:05 2018 - [info] 192.168.8.58(192.168.8.58:3306) (current master) +--192.168.8.57(192.168.8.57:3306) +--192.168.8.59(192.168.8.59:3306) Thu Oct 25 20:32:05 2018 - [info] Checking replication health on 192.168.8.57.. Thu Oct 25 20:32:05 2018 - [info] ok. Thu Oct 25 20:32:05 2018 - [info] Checking replication health on 192.168.8.59.. Thu Oct 25 20:32:05 2018 - [info] ok. Thu Oct 25 20:32:05 2018 - [info] Checking master_ip_failover_script status: Thu Oct 25 20:32:05 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.8.58 --orig_master_ip=192.168.8.58 --orig_master_port=3306 Thu Oct 25 20:32:06 2018 - [info] OK. Thu Oct 25 20:32:06 2018 - [warning] shutdown_script is not defined. Thu Oct 25 20:32:06 2018 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.
启动MHA监控程序
./masterha_start.sh
查看manager日志
Thu Oct 25 20:33:07 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Thu Oct 25 20:33:07 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Thu Oct 25 20:33:07 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Thu Oct 25 20:33:07 2018 - [info] MHA::MasterMonitor version 0.58. Thu Oct 25 20:33:09 2018 - [info] GTID failover mode = 1 Thu Oct 25 20:33:09 2018 - [info] Dead Servers: Thu Oct 25 20:33:09 2018 - [info] Alive Servers: Thu Oct 25 20:33:09 2018 - [info] 192.168.8.57(192.168.8.57:3306) Thu Oct 25 20:33:09 2018 - [info] 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:33:09 2018 - [info] 192.168.8.59(192.168.8.59:3306) Thu Oct 25 20:33:09 2018 - [info] Alive Slaves: Thu Oct 25 20:33:09 2018 - [info] 192.168.8.57(192.168.8.57:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 20:33:09 2018 - [info] GTID ON Thu Oct 25 20:33:09 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:33:09 2018 - [info] Primary candidate for the new Master (candidate_master is set) Thu Oct 25 20:33:09 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Thu Oct 25 20:33:09 2018 - [info] GTID ON Thu Oct 25 20:33:09 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:33:09 2018 - [info] Current Alive Master: 192.168.8.58(192.168.8.58:3306) Thu Oct 25 20:33:09 2018 - [info] Checking slave configurations.. Thu Oct 25 20:33:09 2018 - [info] Checking replication filtering settings.. Thu Oct 25 20:33:09 2018 - [info] binlog_do_db= , binlog_ignore_db= Thu Oct 25 20:33:09 2018 - [info] Replication filtering check ok. Thu Oct 25 20:33:09 2018 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking. Thu Oct 25 20:33:09 2018 - [info] Checking SSH publickey authentication settings on the current master.. Thu Oct 25 20:33:09 2018 - [info] HealthCheck: SSH to 192.168.8.58 is reachable. Thu Oct 25 20:33:09 2018 - [info] 192.168.8.58(192.168.8.58:3306) (current master) +--192.168.8.57(192.168.8.57:3306) +--192.168.8.59(192.168.8.59:3306) Thu Oct 25 20:33:09 2018 - [info] Checking master_ip_failover_script status: Thu Oct 25 20:33:09 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.8.58 --orig_master_ip=192.168.8.58 --orig_master_port=3306 Thu Oct 25 20:33:09 2018 - [info] OK. Thu Oct 25 20:33:09 2018 - [warning] shutdown_script is not defined. Thu Oct 25 20:33:09 2018 - [info] Set master ping interval 1 seconds. Thu Oct 25 20:33:09 2018 - [info] Set secondary check script: /usr/local/bin/masterha_secondary_check -s 192.168.8.57 -s 192.168.8.59 Thu Oct 25 20:33:09 2018 - [info] Starting ping health check on 192.168.8.58(192.168.8.58:3306).. Thu Oct 25 20:33:09 2018 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..
到此,自动切换及恢复工作测试完毕。
感谢各位的阅读,以上就是“MySQL5.7一主两从MHA自动切换”的内容了,经过本文的学习后,相信大家对MySQL5.7一主两从MHA自动切换这一问题有了更深刻的体会,具体使用情况还需要大家实践验证。这里是亿速云,小编将为大家推送更多相关知识点的文章,欢迎关注!
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