MHA 报错：There is no alive slave. We can't do failover

dba http://blog.csdn.net/zengxuewen2045/article/details/51524880

关于这个错误：

 

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Mon Feb 13 10:29:41 2017 - [error][/usr/share/perl5/vendor_perl/MHA/ServerManager.pm, ln188] There is no alive server. We can't do failover Mon Feb 13 10:29:41 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 Mon Feb 13 10:29:41 2017 - [error][/usr/share/perl5/vendor_perl/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers. Mon Feb 13 10:29:41 2017 - [info] Got exit code 1 (Not master dead).

在之前的部署文档里：

 

1	http://d-prototype.com/archives/6873

我说需要把server_id，改成10，可以走过去。
其实这是很片面的。

今天又遇到了这个问题，并解决了。

关于该问题，比较靠谱的解释是：
MHA默认去连接MySQL的端口是：3306

如果你的主机名解析，或者你写的IP都没问题，防火墙也关闭了，那么，剩下的原因是：
你的MySQL，没有运行在默认端口上。

如果不能修改MySQL的端口为：3306。

那么你可以给MHA，添加PORT描述。

以下是添加端口描述的MHA应用配置文件的样例：

 

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[server default] manager_workdir=/work_dir/mha_manager manager_log=/work_dir/mha_manager/mha_manager.log   [server1] hostname=mha2 candidate_master=1 port=3307   [server2] hostname=mha3 candidate_master=1 port=3307   [server3] hostname=mha4 #candidate_master=1 no_master=1 port=3307

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8.MHA架构中的错误

Tue Apr 28 15:15:36 2015 - [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln193] There is no alive slave. We can't do failover
Tue Apr 28 15:15:36 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln383] Error happend on checking configurations.  at /usr/local/share/perl5/MHA/MasterMonitor.pm line 298
Tue Apr 28 15:15:36 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln478] Error happened on monitoring servers.

解决方法:

(1).删除健康检查文件  rm -rf /var/log/masterha/app1/app1.master_status.health 
(2).在宕机的数据库中重新同步到主服务器 change master to master_host...............

(3).检查复制是否出错 masterha_check_repl --conf=/etc/mysqlmha/conf/app1.cnf

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主从同步已经打好的情况下执行
grant all privileges on *.* to 'root'@'server01' identified by '123qwe!@#';
grant all privileges on *.* to 'root'@'server02' identified by '123qwe!@#';
grant all privileges on *.* to 'root'@'server03' identified by '123qwe!@#';
grant all privileges on *.* to 'root'@'server04' identified by '123qwe!@#';
flush privileges;
[root@server01 lib]# masterha_check_repl --conf=/etc/masterha/app1.cnf
Tue Jul 12 16:08:08 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Jul 12 16:08:08 2016 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
Tue Jul 12 16:08:08 2016 - [info] Reading server configurations from /etc/masterha/app1.cnf..
Tue Jul 12 16:08:08 2016 - [info] MHA::MasterMonitor version 0.53.
Tue Jul 12 16:08:08 2016 - [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln193] There is no alive slave. We can't do failover
Tue Jul 12 16:08:08 2016 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln383] Error happend on checking configurations.  at /usr/local/share/perl5/MHA/MasterMonitor.pm line 298
Tue Jul 12 16:08:08 2016 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln478] Error happened on monitoring servers.
Tue Jul 12 16:08:08 2016 - [info] Got exit code 1 (Not master dead).
配置主主复制架构，并设置其中一台为read_only  (set global read_only=1;)