安装环境：CentOS 6.5 MySQL 5.7.22 MHA 0.56

 

 

1、找不到mysql 命令

Sat Mar 23 07:17:50 2019 - [info] Connecting to root@192.168.32.181(server2:22)..
Checking slave recovery environment settings..
Opening /data/mysql/relay-log.info ... ok.
Relay log found at /data/mysql, up to server2-relay-bin.000005
Temporary relay log file is /data/mysql/server2-relay-bin.000005
Testing mysql connection and privileges..sh: mysql: command not found
mysql command failed with rc 127:0!

 

解决办法：找到MySQL 的安装目录，创建适当的软链接

ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql

2、脚本文件没有执行权限

Sat Mar 23 07:25:46 2019 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. Can't exec "/usr/local/bin/master_ip_failover": Permission denied at /usr/share/perl5/vendor_perl/MHA/ManagerUtil.pm line 68.
Sat Mar 23 07:25:46 2019 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Sat Mar 23 07:25:46 2019 - [info] Got exit code 1 (Not master dead).

MySQL Replication Health is NOT OK!

解决办法：赋权

chmod +x /usr/local/bin/master_ip_failover

 

3、master_ip_failover脚本错误

 

Sat Mar 23 07:27:44 2019 - [info] Checking master_ip_failover_script status:
Sat Mar 23 07:27:44 2019 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=server1 --orig_master_ip=192.168.32.180 --orig_master_port=3306
/usr/local/bin/master_ip_failover: line 4: use: command not found
/usr/local/bin/master_ip_failover: line 6: use: command not found
/usr/local/bin/master_ip_failover: line 10: use: command not found
/usr/local/bin/master_ip_failover: line 14: syntax error near unexpected token `newline'
/usr/local/bin/master_ip_failover: line 14: `my ( '
Sat Mar 23 07:27:44 2019 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln226] Failed to get master_ip_failover_script status with return code 2:0.
Sat Mar 23 07:27:44 2019 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/bin/masterha_check_repl line 48
Sat Mar 23 07:27:44 2019 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Sat Mar 23 07:27:44 2019 - [info] Got exit code 1 (Not master dead).

 

解决办法：#!/usr/bin/env perl要最顶行

 

4、不能切换，出现 No route to host

[root@server3 ~]# masterha_manager --conf=/etc/masterha/app1.cnf
Sun Mar 24 01:49:48 2019 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sun Mar 24 01:49:48 2019 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Sun Mar 24 01:49:48 2019 - [info] Reading server configuration from /etc/masterha/app1.cnf..
ssh: connect to host 192.168.32.180 port 22: No route to host
ssh: connect to host 192.168.32.180 port 22: No route to host
ssh: connect to host 192.168.32.180 port 22: No route to host
ssh: connect to host 192.168.32.180 port 22: No route to host
ssh: connect to host 192.168.32.180 port 22: No route to host
ssh: connect to host 192.168.32.180 port 22: No route to host

解决办法：

找到MHA的log文件，查看原因：

Sun Mar 24 01:51:43 2019 - [info] Executing secondary network check script: /usr/local/bin/masterha_secondary_check -s 192.168.32.181 -s 192