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分享MHA启动不了
环境：CentOS6.2，mysql5.1，MHA 0.56，配置了3台服务器（A、B、C），A是MHA管理节点，C和B分别是主从mysql
使用一切正常（除了主从复制时延迟比较严重）。
听说mysql5.7的延迟解决的很好，就把A、B、C的mysql5.1卸载，安装了mysql5.7；安装后，C和B的主从关系正常。
问题：A中的MHA启动不了，报错如下：
tail: /var/log/masterha/app1/app1.log: file truncated
Fri Aug 11 13:48:13 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Fri Aug 11 13:48:13 2017 - [info] Reading application default configuration from /etc/app1.cnf..
Fri Aug 11 13:48:13 2017 - [info] Reading server configuration from /etc/app1.cnf..
Fri Aug 11 13:48:13 2017 - [info] MHA::MasterMonitor version 0.56.
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.Compilation failed in require at (eval 27) line 3.
at /usr/share/perl5/vendor_perl/MHA/DBHelper.pm line 205
at /usr/share/perl5/vendor_perl/MHA/Server.pm line 166
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.
Compilation failed in require at (eval 27) line 3.
at /usr/share/perl5/vendor_perl/MHA/DBHelper.pm line 205
at /usr/share/perl5/vendor_perl/MHA/Server.pm line 166
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln309] Got fatal error, stopping operations
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm line 326
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Fri Aug 11 13:48:13 2017 - [info] Got exit code 1 (Not master dead).
请前辈给 指点下！
使用一切正常（除了主从复制时延迟比较严重）。
听说mysql5.7的延迟解决的很好，就把A、B、C的mysql5.1卸载，安装了mysql5.7；安装后，C和B的主从关系正常。
问题：A中的MHA启动不了，报错如下：
tail: /var/log/masterha/app1/app1.log: file truncated
Fri Aug 11 13:48:13 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Fri Aug 11 13:48:13 2017 - [info] Reading application default configuration from /etc/app1.cnf..
Fri Aug 11 13:48:13 2017 - [info] Reading server configuration from /etc/app1.cnf..
Fri Aug 11 13:48:13 2017 - [info] MHA::MasterMonitor version 0.56.
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.Compilation failed in require at (eval 27) line 3.
at /usr/share/perl5/vendor_perl/MHA/DBHelper.pm line 205
at /usr/share/perl5/vendor_perl/MHA/Server.pm line 166
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.
Compilation failed in require at (eval 27) line 3.
at /usr/share/perl5/vendor_perl/MHA/DBHelper.pm line 205
at /usr/share/perl5/vendor_perl/MHA/Server.pm line 166
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln309] Got fatal error, stopping operations
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm line 326
Fri Aug 11 13:48:13 2017 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Fri Aug 11 13:48:13 2017 - [info] Got exit code 1 (Not master dead).
请前辈给 指点下！
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Santiago_coolkit 2019-10-16
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Tue Oct 15 18:22:54 2019 - [info] Reading default configuration from /etc/masterha_default.cnf..
Tue Oct 15 18:22:54 2019 - [info] Reading application default configuration from /etc/mha/app1.cnf..
Tue Oct 15 18:22:54 2019 - [info] Reading server configuration from /etc/mha/app1.cnf..
Tue Oct 15 18:22:54 2019 - [info] MHA::MasterMonitor version 0.58.
Tue Oct 15 18:22:54 2019 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.
Compilation failed in require at (eval 188) line 3.
Tue Oct 15 18:22:54 2019 - [info] Reading application default configuration from /etc/mha/app1.cnf..
Tue Oct 15 18:22:54 2019 - [info] Reading server configuration from /etc/mha/app1.cnf..
Tue Oct 15 18:22:54 2019 - [info] MHA::MasterMonitor version 0.58.
Tue Oct 15 18:22:54 2019 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln301] install_driver(mysql) failed: Attempt to reload DBD/mysql.pm aborted.
Compilation failed in require at (eval 188) line 3.
