MySQL MHA配置的常见问题及处置方法
发布时间：2022-01-15 21:30:55 所属栏目：MySql教程 来源：互联网
导读：这篇文章主要讲解了MySQL MHA配置的常见问题及解决方法，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MySQL MHA配置的常见问题及解决方法吧！ 问题一： Thu Aug 23 04:39:01 2018 - [warning] log-bin is
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这篇文章主要讲解了“MySQL MHA配置的常见问题及解决方法”，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“MySQL MHA配置的常见问题及解决方法”吧！ 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 statusG 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' 感谢各位的阅读，以上就是“MySQL MHA配置的常见问题及解决方法”的内容了，经过本文的学习后，相信大家对MySQL MHA配置的常见问题及解决方法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。 （编辑：应用网_丽江站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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