很早之前写过MHA的文章，但是常常在技术群看到有同学问MHA搭建的问题，不是权限问题就是配置问题，我在这里就再次一写下配置过程以及快速的搭建。如果想知道更多的细节与原理，请参考：MySQL高可用架构之MHA
环境：
1主1从，manager放在从库。
主库：192.168.0.10
从库：192.168.0.20
两台机器的mysql安装完成初始化以后进行复制搭建，首先登录主库（192.168.0.10），查看pos点：
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 154 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
然后在主库（192.168.0.10）
添加复制账号以及mha用的账号
mysql> grant replication slave on *.* to 'repl'@'192.168.0.10' identified by 'repl'; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> grant replication slave on *.* to 'repl'@'192.168.0.20' identified by 'repl'; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> grant all on *.* to 'root'@'192.168.0.20' identified by '123'; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> grant all on *.* to 'root'@'192.168.0.10' identified by '123'; Query OK, 0 rows affected, 1 warning (0.01 sec) mysql>
从库（192.168.0.10 ）change到mysql-bin.000001，pos点154
CHANGE MASTER TO MASTER_HOST='192.168.0.10',MASTER_USER='repl',MASTER_PASSWORD='repl',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=154;
mysql> start slave;
Query OK, 0 rows affected (0.15 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.10
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 1344
Relay_Log_File: relaylog.000002
Relay_Log_Pos: 1510
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
复制到这来就搭建完成了，然后配置192.168.0.10和192.168.0.20 ssh互信。（两台机器都执行）
ssh-keygen -t rsa ssh-copy-id -i /root/.ssh/id_rsa.pub '-p 22 192.168.0.10' ssh-copy-id -i /root/.ssh/id_rsa.pub '-p 22 192.168.0.20'
安装MHA软件，首先安装epel源。（2台机器）
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
安装依赖包
yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes -y
安装MHA软件（两台机器）
tar xf mha4mysql-node-0.56.tar.gz cd mha4mysql-node-0.56 perl Makefile.PL make && make install tar xf mha4mysql-manager-0.56.tar.gz cd mha4mysql-manager-0.56 perl Makefile.PL make && make install
在从库（192.168.0.20）创建目录：
mkdir /data/mha/3306/log cd /data/mha/3306/touch mha.cnf
mha.cnf配置文件内容如下：
[server default] client_bindir=/usr/local/mysql/bin/ manager_log=/data/mha/3306/log/manager.log manager_workdir=/data/mha/3306/log master_binlog_dir=/data/mysql/3306/binlog/ master_ip_failover_script=/usr/local/bin/master_ip_failover master_ip_online_change_script= /usr/local/bin/master_ip_online_change report_script=/usr/local/bin/send_report init_conf_load_script=/usr/local/bin/load_cnf remote_workdir=/data/mysql/3306/mysqltmp #secondary_check_script= /usr/local/bin/masterha_secondary_check -s 192.168.0.30 -s 192.168.0.40 user=root ping_interval=3 repl_user=repl ssh_port=22 ssh_user=root max_ping_errors=40 [server1] hostname=192.168.0.10 port=3306 [server2] candidate_master=1 check_repl_delay=0 hostname=192.168.0.20 port=3306
编辑文件 /usr/local/bin/load_cnf 里面的密码修改成对应的密码
#!/usr/bin/perl print "password=123\n"; print "repl_password=repl\n";
执行chek命令查看复制是否正常：
[root@dbserver-yayun-02 3306]# masterha_check_repl --conf=/data/mha/3306/mha.cnf
Mon Mar 13 21:36:54 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Mon Mar 13 21:36:54 2017 - [info] Reading application default configuration from /data/mha/3306/mha.cnf..
Mon Mar 13 21:36:54 2017 - [info] Updating application default configuration from /usr/local/bin/load_cnf..
Mon Mar 13 21:36:54 2017 - [info] Reading server configuration from /data/mha/3306/mha.cnf..
Mon Mar 13 21:36:54 2017 - [info] Setting max_ping_errors to 40, ping_interval to 3.
Mon Mar 13 21:36:54 2017 - [info] MHA::MasterMonitor version 0.56.
Mon Mar 13 21:36:54 2017 - [info] GTID failover mode = 0
Mon Mar 13 21:36:54 2017 - [info] Dead Servers:
Mon Mar 13 21:36:54 2017 - [info] Alive Servers:
Mon Mar 13 21:36:54 2017 - [info] 192.168.0.10(192.168.0.10:3306)
Mon Mar 13 21:36:54 2017 - [info] 192.168.0.20(192.168.0.20:3306)
Mon Mar 13 21:36:54 2017 - [info] Alive Slaves:
Mon Mar 13 21:36:54 2017 - [info] 192.168.0.20(192.168.0.20:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled
Mon Mar 13 21:36:54 2017 - [info] Replicating from 192.168.0.10(192.168.0.10:3306)
Mon Mar 13 21:36:54 2017 - [info] Primary candidate for the new Master (candidate_master is set)
Mon Mar 13 21:36:54 2017 - [info] Current Alive Master: 192.168.0.10(192.168.0.10:3306)
Mon Mar 13 21:36:54 2017 - [info] Checking slave configurations..
Mon Mar 13 21:36:54 2017 - [info] read_only=1 is not set on slave 192.168.0.20(192.168.0.20:3306).
Mon Mar 13 21:36:54 2017 - [warning] relay_log_purge=0 is not set on slave 192.168.0.20(192.168.0.20:3306).
Mon Mar 13 21:36:54 2017 - [info] Checking replication filtering settings..
Mon Mar 13 21:36:54 2017 - [info] binlog_do_db= , binlog_ignore_db=
Mon Mar 13 21:36:54 2017 - [info] Replication filtering check ok.
Mon Mar 13 21:36:54 2017 - [info] GTID (with auto-pos) is not supported
Mon Mar 13 21:36:54 2017 - [info] Starting SSH connection tests..
Mon Mar 13 21:36:55 2017 - [info] All SSH connection tests passed successfully.
Mon Mar 13 21:36:55 2017 - [info] Checking MHA Node version..
Mon Mar 13 21:36:55 2017 - [info] Version check ok.
Mon Mar 13 21:36:55 2017 - [info] Checking SSH publickey authentication settings on the current master..
Mon Mar 13 21:36:55 2017 - [info] HealthCheck: SSH to 192.168.0.10 is reachable.
Mon Mar 13 21:36:56 2017 - [info] Master MHA Node version is 0.56.
Mon Mar 13 21:36:56 2017 - [info] Checking recovery script configurations on 192.168.0.10(192.168.0.10:3306)..
Mon Mar 13 21:36:56 2017 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/3306/binlog/ --output_file=/data/mysql/3306/mysqltmp/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000001
Mon Mar 13 21:36:56 2017 - [info] Connecting to root@192.168.0.10(192.168.0.10:22)..
Creating /data/mysql/3306/mysqltmp if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /data/mysql/3306/binlog/, up to mysql-bin.000001
Mon Mar 13 21:36:56 2017 - [info] Binlog setting check done.
Mon Mar 13 21:36:56 2017 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Mon Mar 13 21:36:56 2017 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.0.20 --slave_ip=192.168.0.20 --slave_port=3306 --workdir=/data/mysql/3306/mysqltmp --target_version=5.7.17-log --manager_version=0.56 --client_bindir=/usr/local/mysql/bin/ --relay_dir=/data/mysql/3306/relaylog --current_relay_log=relaylog.000002 --slave_pass=xxx
Mon Mar 13 21:36:56 2017 - [info] Connecting to root@192.168.0.20(192.168.0.20:22)..
Checking slave recovery environment settings..
Relay log found at /data/mysql/3306/relaylog, up to relaylog.000002
Temporary relay log file is /data/mysql/3306/relaylog/relaylog.000002
Testing mysql connection and privileges..mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Mon Mar 13 21:36:56 2017 - [info] Slaves settings check done.
Mon Mar 13 21:36:56 2017 - [info]
192.168.0.10(192.168.0.10:3306) (current master)
+--192.168.0.20(192.168.0.20:3306)
Mon Mar 13 21:36:56 2017 - [info] Checking replication health on 192.168.0.20..
Mon Mar 13 21:36:56 2017 - [info] ok.
Mon Mar 13 21:36:56 2017 - [info] Checking master_ip_failover_script status:
Mon Mar 13 21:36:56 2017 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.0.10 --orig_master_ip=192.168.0.10 --orig_master_port=3306
IN SCRIPT TEST====/sbin/ifconfig eth1:1 down==/sbin/ifconfig eth1:1 192.168.0.88/16===
Checking the Status of the script.. OK
Mon Mar 13 21:36:56 2017 - [info] OK.
Mon Mar 13 21:36:56 2017 - [warning] shutdown_script is not defined.
Mon Mar 13 21:36:56 2017 - [info] Got exit code 0 (Not master dead).
MySQL Replication Health is OK.
主库（192.168.0.10）执行命令，启动vip：
/sbin/ifconfig eth1:1 192.168.0.88/16
在线切换，把主库切到192.168.0.20
masterha_master_switch --master_state=alive --conf=/data/mha/3306/mha.cnf --new_master_host=192.168.0.20 --new_master_port=3306 --orig_master_is_new_slave
输出如下：
Mon Mar 13 22:15:08 2017 - [info] MHA::MasterRotate version 0.56. Mon Mar 13 22:15:08 2017 - [info] Starting online master switch.. Mon Mar 13 22:15:08 2017 - [info] Mon Mar 13 22:15:08 2017 - [info] * Phase 1: Configuration Check Phase.. Mon Mar 13 22:15:08 2017 - [info] Mon Mar 13 22:15:08 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Mon Mar 13 22:15:08 2017 - [info] Reading application default configuration from /data/mha/3306/mha.cnf.. Mon Mar 13 22:15:08 2017 - [info] Updating application default configuration from /usr/local/bin/load_cnf.. Mon Mar 13 22:15:08 2017 - [info] Reading server configuration from /data/mha/3306/mha.cnf.. Mon Mar 13 22:15:08 2017 - [info] Setting max_ping_errors to 40, ping_interval to 3. Mon Mar 13 22:15:08 2017 - [info] GTID failover mode = 0 Mon Mar 13 22:15:08 2017 - [info] Current Alive Master: 192.168.0.10(192.168.0.10:3306) Mon Mar 13 22:15:08 2017 - [info] Alive Slaves: Mon Mar 13 22:15:08 2017 - [info] 192.168.0.20(192.168.0.20:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled Mon Mar 13 22:15:08 2017 - [info] Replicating from 192.168.0.10(192.168.0.10:3306) Mon Mar 13 22:15:08 2017 - [info] Primary candidate for the new Master (candidate_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 192.168.0.10(192.168.0.10:3306)? (YES/no): yes Mon Mar 13 22:15:09 2017 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time.. Mon Mar 13 22:15:09 2017 - [info] ok. Mon Mar 13 22:15:09 2017 - [info] Checking MHA is not monitoring or doing failover.. Mon Mar 13 22:15:09 2017 - [info] Checking replication health on 192.168.0.20.. Mon Mar 13 22:15:09 2017 - [info] ok. Mon Mar 13 22:15:09 2017 - [info] 192.168.0.20 can be new master. Mon Mar 13 22:15:09 2017 - [info] From: 192.168.0.10(192.168.0.10:3306) (current master) +--192.168.0.20(192.168.0.20:3306) To: 192.168.0.20(192.168.0.20:3306) (new master) +--192.168.0.10(192.168.0.10:3306) Starting master switch from 192.168.0.10(192.168.0.10:3306) to 192.168.0.20(192.168.0.20:3306)? (yes/NO): yes Mon Mar 13 22:15:10 2017 - [info] Checking whether 192.168.0.20(192.168.0.20:3306) is ok for the new master.. Mon Mar 13 22:15:10 2017 - [info] ok. Mon Mar 13 22:15:10 2017 - [info] 192.168.0.10(192.168.0.10:3306): SHOW SLAVE STATUS returned empty result. To check replication filtering rules, temporarily executing CHANGE MASTER to a dummy host. Mon Mar 13 22:15:11 2017 - [info] 192.168.0.10(192.168.0.10:3306): Resetting slave pointing to the dummy host. Mon Mar 13 22:15:11 2017 - [info] ** Phase 1: Configuration Check Phase completed. Mon Mar 13 22:15:11 2017 - [info] Mon Mar 13 22:15:11 2017 - [info] * Phase 2: Rejecting updates Phase.. Mon Mar 13 22:15:11 2017 - [info] Mon Mar 13 22:15:11 2017 - [info] Executing master ip online change script to disable write on the current master: Mon Mar 13 22:15:11 2017 - [info] /usr/local/bin/master_ip_online_change --command=stop --orig_master_host=192.168.0.10 --orig_master_ip=192.168.0.10 --orig_master_port=3306 --orig_master_user='root' --orig_master_password='123' --new_master_host=192.168.0.20 --new_master_ip=192.168.0.20 --new_master_port=3306 --new_master_user='root' --new_master_password='123' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave Mon Mar 13 22:15:11 2017 173907 Set read_only on the new master.. ok. Mon Mar 13 22:15:11 2017 177320 Drpping app user on the orig master.. Mon Mar 13 22:15:11 2017 177844 Set read_only=1 on the orig master.. ok. Mon Mar 13 22:15:11 2017 179299 Killing all application threads.. Mon Mar 13 22:15:11 2017 179318 done. Mon Mar 13 22:15:11 2017 - [info] ok. Mon Mar 13 22:15:11 2017 - [info] Locking all tables on the orig master to reject updates from everybody (including root): Mon Mar 13 22:15:11 2017 - [info] Executing FLUSH TABLES WITH READ LOCK.. Mon Mar 13 22:15:11 2017 - [info] ok. Mon Mar 13 22:15:11 2017 - [info] Orig master binlog:pos is mysql-bin.000001:2265. Mon Mar 13 22:15:11 2017 - [info] Waiting to execute all relay logs on 192.168.0.20(192.168.0.20:3306).. Mon Mar 13 22:15:11 2017 - [info] master_pos_wait(mysql-bin.000001:2265) completed on 192.168.0.20(192.168.0.20:3306). Executed 0 events. Mon Mar 13 22:15:11 2017 - [info] done. Mon Mar 13 22:15:11 2017 - [info] Getting new master's binlog name and position.. Mon Mar 13 22:15:11 2017 - [info] mysql-bin.000001:2265 Mon Mar 13 22:15:11 2017 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.0.20', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=2265, MASTER_USER='repl', MASTER_PASSWORD='xxx'; Mon Mar 13 22:15:11 2017 - [info] Executing master ip online change script to allow write on the new master: Mon Mar 13 22:15:11 2017 - [info] /usr/local/bin/master_ip_online_change --command=start --orig_master_host=192.168.0.10 --orig_master_ip=192.168.0.10 --orig_master_port=3306 --orig_master_user='root' --orig_master_password='123' --new_master_host=192.168.0.20 --new_master_ip=192.168.0.20 --new_master_port=3306 --new_master_user='root' --new_master_password='123' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave Mon Mar 13 22:15:11 2017 493612 Set read_only=0 on the new master. Mon Mar 13 22:15:11 2017 493874 Creating app user on the new master.. Mon Mar 13 22:15:32 2017 - [info] ok. Mon Mar 13 22:15:32 2017 - [info] Mon Mar 13 22:15:32 2017 - [info] * Switching slaves in parallel.. Mon Mar 13 22:15:32 2017 - [info] Mon Mar 13 22:15:32 2017 - [info] Unlocking all tables on the orig master: Mon Mar 13 22:15:32 2017 - [info] Executing UNLOCK TABLES.. Mon Mar 13 22:15:32 2017 - [info] ok. Mon Mar 13 22:15:32 2017 - [info] Starting orig master as a new slave.. Mon Mar 13 22:15:32 2017 - [info] Resetting slave 192.168.0.10(192.168.0.10:3306) and starting replication from the new master 192.168.0.20(192.168.0.20:3306).. Mon Mar 13 22:15:32 2017 - [info] Executed CHANGE MASTER. Mon Mar 13 22:15:32 2017 - [info] Slave started. Mon Mar 13 22:15:32 2017 - [info] All new slave servers switched successfully. Mon Mar 13 22:15:32 2017 - [info] Mon Mar 13 22:15:32 2017 - [info] * Phase 5: New master cleanup phase.. Mon Mar 13 22:15:32 2017 - [info] Mon Mar 13 22:15:32 2017 - [info] 192.168.0.20: Resetting slave info succeeded. Mon Mar 13 22:15:32 2017 - [info] Switching master to 192.168.0.20(192.168.0.20:3306) completed successfully.
关于配置文件中的参数：
max_ping_errors=40，这个是修改了源码，增加了检测次数的定义，默认是3次，太容易误切换。
启动管理进程：
/usr/bin/nohup /usr/local/bin/masterha_manager --conf=/data/mha/3306/mha.cnf --ignore_last_failover > /data/mha/3306/log/manager.log 2>&1 &
在主库（192.168.0.10）封掉ip，可以看到日志输出。
iptables -I INPUT -s 192.168.0.20 -j DROP
Mon Mar 13 22:22:50 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:22:50 2017 - [warning] Connection failed 3 time(s).. Mon Mar 13 22:22:53 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:22:53 2017 - [warning] Connection failed 4 time(s).. Mon Mar 13 22:22:56 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:22:56 2017 - [warning] Connection failed 5 time(s).. Mon Mar 13 22:22:59 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:22:59 2017 - [warning] Connection failed 6 time(s).. Mon Mar 13 22:23:02 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:23:02 2017 - [warning] Connection failed 7 time(s).. Mon Mar 13 22:23:05 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:23:05 2017 - [warning] Connection failed 8 time(s).. Mon Mar 13 22:23:08 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:23:08 2017 - [warning] Connection failed 9 time(s).. Mon Mar 13 22:23:11 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:23:11 2017 - [warning] Connection failed 10 time(s).. Mon Mar 13 22:23:14 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4)) Mon Mar 13 22:23:14 2017 - [warning] Connection failed 11 time(s).. Mon Mar 13 22:23:17 2017 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.0.10' (4))
修改以后的软件包下载地址：链接：http://pan.baidu.com/s/1c3qg70 密码：f9u2
来源：https://www.cnblogs.com/gomysql/p/6547797.html