MHA常见报错以及解决方法
error 1
运行masterha_check_repl --conf=/etc/masterha/app1.cnf报错
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Testing MySQL connection and privileges..sh: mysql: command not found
mysql command failed with rc 127:0!
at /usr/bin/apply_diff_relay_logs line 375
解决方案：ln -s /usr/local/mysql/bin/mysql /usr/bin
error 2
运行masterha_check_repl --conf=/etc/masterha/app1.cnf报错
Can't exec "mysqlbinlog": No such file or directory at /usr/local/perl5/MHA/BinlogManager.pm line 99.
解决方案：在node节点上执行 which mysqlbinlog，比如我的结果就是
[localhost~]$ which mysqlbinlog
/usr/local/mysql/bin/mysqlbinlog
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
error 3
运行master_check_ssh --conf=/etc/masterha/aap1.cnf报错
connection via SSH fromroot@192.168.17.199toroot@192.168.17.200 ...
permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)
[error] [/usr/local/share/perl5/MHA/SSHcheck.pm,ln163]
解决方案：一般是公钥有问题，需要删除 /root/.ssh/known_hosts里面的相关ip内容 重新生成一下就ok了
error 4
运行master_check_ssh --conf=/etc/masterha/aap1.cnf报错
Sun Nov 20 20:10:59 2016 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysqllog/3306 --output_file=/masterha/app1/save_binary_logs_test --manager_version=0.55 --start_file=mysql-bin.000001
Sun Nov 20 20:10:59 2016 - [info] Connecting to root@172.18.3.180(172.18.3.180)..
Failed to save binary log: Binlog not found from /data/mysqllog/3306! If you got this error at MHA Manager, please set "master_binlog_dir=/path/to/binlog_directory_of_the_master" correctly in the MHA Manager's configuration file and try again.
at /usr/bin/save_binary_logs line 117.
eval {...} called at /usr/bin/save_binary_logs line 66
main::main() called at /usr/bin/save_binary_logs line 62
Sun Nov 20 20:10:59 2016 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln154] Master setting check failed!
Sun Nov 20 20:10:59 2016 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln367] Master configuration failed.
Sun Nov 20 20:10:59 2016 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln386] Error happend on checking configurations. at /usr/bin/masterha_check_repl line 48.
Sun Nov 20 20:10:59 2016 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln482] Error happened on monitoring servers.
Sun Nov 20 20:10:59 2016 - [info] Got exit code 1 (Not master dead).
解决方案：
/etc/masterha/aap1.cnf中的datadir路径应该是mysql中bin-log的位置
error 5
运行masterha_check_repl --conf=/etc/masterha/app1.cnf报错
Mon Nov 21 11:11:40 2016 - [info] MHA::MasterRotate version 0.55.
Mon Nov 21 11:11:40 2016 - [info] Starting online master switch..
Mon Nov 21 11:11:40 2016 - [info]
Mon Nov 21 11:11:40 2016 - [info] * Phase 1: Configuration Check Phase..
Mon Nov 21 11:11:40 2016 - [info]
Mon Nov 21 11:11:40 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Mon Nov 21 11:11:40 2016 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
Mon Nov 21 11:11:40 2016 - [info] Reading server configurations from /etc/masterha/app1.cnf..
Mon Nov 21 11:11:40 2016 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln604] There are 2 non-slave servers! MHA manages at most one non-slave server. Check configurations.
Mon Nov 21 11:11:40 2016 - [error][/usr/share/perl5/vendor_perl/MHA/ManagerUtil.pm, ln178] Got ERROR: at /usr/share/perl5/vendor_perl/MHA/MasterRotate.pm line 85.
解决方案：
手动将修复后的master做成新的master的从服务器
warning 1
各从库应设置relay_log_purge=0
###否则收到以下告警信息 ##mysql -e 'set global relay_log_purge=0' 动态修改该参数，因为随时slave会提升为master
[warning] relay_log_purge=0 is not set on slave (172.18.3.140:3306).
warning 2
各从库设置read_only=1
###否则收到以下告警信息 ## mysql -e 'set global read_only=1' 动态修改该参数，因为随时slave会提升为master。
[info] read_only=1 is not set on slave (172.18.3.107:3306
[root@centos7-04 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf
问题一：
Thu Aug 23 04:39:01 2018 - [warning] log-bin is not set on slave 192.168.0.189(192.168.0.189:3306). This host cannot be a master.
Thu Aug 23 04:39:01 2018 - [warning] log-bin is not set on slave 192.168.0.190(192.168.0.190:3306). This host cannot be a master.
解决办法：
从库的各客户端应开启binlog，即log_bin=on，两个从上都开启
[root@centos7-02 ~]# vi /etc/my.cnf
basedir = /usr/local/mysql
datadir = /data/mysql
socket = /tmp/mysql.sock
server-id=189
log_bin=on
问题二：
Can't exec "mysqlbinlog": 没有那个文件或目录 at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.
mysqlbinlog version command failed with rc 1:0, please verify PATH, LD_LIBRARY_PATH, and client options
at /usr/local/bin/apply_diff_relay_logs line 493.
解决办法：
在所有节点上执行如下命令
[root@centos7-01 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-01 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql
[root@centos7-02 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-02 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql
[root@centos7-03 ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
[root@centos7-03 ~]# ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql
问题三：
Thu Aug 23 05:41:59 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln226] Failed to get master_ip_failover_script status with return code 1:0.
Thu Aug 23 05:41:59 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/local/bin/masterha_check_repl line 48
Thu Aug 23 05:41:59 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
解决办法：
[root@centos7-04 ~]# vi /etc/masterha/app1.cnf
#master_ip_failover_script= /usr/local/bin/master_ip_failover //先暂时注释这条选项，后面引入keepalived后和修改该脚本以后再开启该选项
注释：Failover有两种方式：一种是虚拟IP地址，一种是全局配置文件。MHA并没有限定使用哪一种方式，而是让用户自己选择，虚拟IP地址的方式会牵扯到其它的软件,比如keepalive软件，而且还要修改脚本master_ip_failover。
问题四：
Thu Aug 23 18:17:14 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. Can't exec "/usr/local/bin/master_ip_failover": 权限不够 at /usr/local/share/perl5/MHA/ManagerUtil.pm line 68.
Thu Aug 23 18:17:14 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
解决办法:
chmod +x /usr/local/bin/master_ip_failover
问题五：
[error][/usr/local/share/perl5/MHA/ServerManager.pm, ln492] Server 192.168.0.190(192.168.0.190:3306) is dead, but must be alive! Check server settings.
解决办法：
[root@centos7-04 ~]# rm -rf /var/log/masterha/app1.log/app1.failover.complete #删除MHA管理机上的这个文件
问题六：
[error][/usr/local/share/perl5/MHA/ServerManager.pm, ln492] Server 192.168.0.190(192.168.0.190:3306) is dead, but must be alive! Check server settings.
解决办法：
清除防火墙规则
问题七：
[error][/usr/local/share/perl5/MHA/ServerManager.pm, ln492] Server 192.168.0.188(192.168.0.188:3306) is dead, but must be alive! Check server settings.
Fri Aug 24 23:50:37 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/local/share/perl5/MHA/MasterMonitor.pm line 399
解决办法：
重启主库的mysql服务
问题八：
[error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln205] Slaves settings check failed!
解决办法：
登陆从数据库，查看主数据库是不是自己设定的
mysql> show slave status\G
Master_Server_Id: 189
问题九：
[error][/usr/local/share/perl5/MHA/ServerManager.pm, ln781] Multi-master configuration is detected, but two or more masters are either writable (read-only is not set) or dead! Check configurations for details. Master configurations are as below:
Master 192.168.0.189(192.168.0.189:3306), dead
Master 192.168.0.188(192.168.0.188:3306), replicating from 192.168.0.189(192.168.0.189:3306)
解决办法：
所有从上执行
mysql -uroot -p -e "set global read_only=1"
问题十：
mysqlbinlog: unknown variable 'default-character-set=utf8'
mysqlbinlog version command failed with rc 7:0, please verify PATH, LD_LIBRARY_PATH, and client options
解决办法：
在所有从服务器上注释掉clinet段default-character-set=utf8mb4
更改默认字符集UTF8到utf8mb4
[client]
#default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
文章题目：MHA常见报错以及解决方法
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