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MySQL 有关MHA搭建与切换的几个错误log汇总
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1：masterha_check_repl 副本集方面报错  replicates is not defined in the configuration file!

具体信息如下：

# /usr/local/bin/masterha_check_repl --conf=/etc/mha/app1.cnf
Thu Nov 21 15:33:15 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu Nov 21 15:33:15 2018 - [info] Reading application default configuration from /etc/mha/app1.cnf..
Thu Nov 21 15:33:15 2018 - [info] Reading server configuration from /etc/mha/app1.cnf..
Thu Nov 21 15:33:15 2018 - [info] MHA::MasterMonitor version 0.56.
Thu Nov 21 15:33:16 2018- [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln671] Master 179.179.19.179:3306 from which slave 179.179.19.180(179.179.19.180:3306) replicates is not defined in the configuration file!
Thu Nov 21 15:33:16 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations. at /usr/local/share/perl5/MHA/MasterMonitor.pm line 326.
Thu Nov 21 15:33:16 2018 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Thu Nov 21 15:33:16 2018 - [info] Got exit code 1 (Not master dead).

MySQL Replication Health is NOT OK!

分析：MHA 漂移过后，我们知道配置信息中 主节点的信息就不在了，我们需要及时维护，否则/usr/local/bin/masterha_check_repl --conf=/etc/mha/XXX.cnf 检查副本集状态报错。

2. masterha_master_switch 在线切换方面 报错 We should not start online master switch when one of connections are running long updates on the current master

具体信息如下：

# /usr/local/bin/masterha_master_switch --master_state=alive --conf=/etc/mha/app1.cnf

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 179.179.19.184(179.179.19.184:3306)"htmlcode">



# /usr/local/bin/masterha_master_switch --master_state=alive --conf=/etc/mha/app1.cnf

Starting master switch from 179.179.19.185(179.179.19:3306) to 179.179.19.184(179.179.19.184:3306)"htmlcode">



Could not execute Delete_rows event on table "htmlcode">



/usr/local/bin/masterha_check_repl --conf=/etc/mha/qqweixinordb.cnf





主要的报错信息





Can't exec "mysqlbinlog": No such file or directory 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.
Fri Aug 28 04:38:22 2019 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln205] Slaves settings check failed!
Fri Aug 28 04:38:22 2019 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln413] Slave configuration failed.
Fri Aug 28 04:38:22 2019 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
Fri Aug 28 04:38:22 2019 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Fri Aug 28 04:38:22 2019 - [info] Got exit code 1 (Not master dead).
 
MySQL Replication Health is NOT OK!





解决方案--在每个DB节点执行以下命令





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





MySQL 有关MHA搭建与切换的几个错误log汇总


 再次检查，报错信息消失，OK。 


6.root 账号密码过期


以root账号设置的ssh免密登陆，而ssh有过期限制，则mha ssh检查时报错:





/usr/local/bin/masterha_check_ssh --conf=/etc/mha/qqorder.cnf
Thu Nov 5 10:09:09 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu Nov 5 10:09:09 2018 - [info] Reading application default configuration from /etc/mha/pms20epime.cnf..
Thu Nov 5 10:09:09 2018 - [info] Reading server configuration from /etc/mha/pms20epime.cnf..
Thu Nov 5 10:09:09 2018 - [info] Starting SSH connection tests..
Thu Nov 5 10:09:09 2018 - [error][/usr/local/share/perl5/MHA/SSHCheck.pm, ln63]
Thu Nov 5 10:09:09 2018 - [debug] Connecting via SSH from root@172.181.191.191(172.181.191.191:22) to root@172.181.191.192(172.181.191.192:22)..

WARNING: Your password has expired.
Password change required but no TTY available.
Thu Nov 5 10:09:09 2018 - [error][/usr/local/share/perl5/MHA/SSHCheck.pm, ln111] SSH connection from root@172.181.191.191(172.181.191.191:22) to root@172.181.191.192(172.181.191.192:22) failed!
Thu Nov 5 10:09:10 2018 - [error][/usr/local/share/perl5/MHA/SSHCheck.pm, ln63]
Thu Nov 5 10:09:09 2018 - [debug] Connecting via SSH from root@172.181.191.192(172.181.191.192:22) to root@172.181.191.191(172.181.191.191:22)..

WARNING: Your password has expired.
Password change required but no TTY available.
Thu Nov 5 10:09:10 2018 - [error][/usr/local/share/perl5/MHA/SSHCheck.pm, ln111] SSH connection from root@172.181.191.192(172.181.191.192:22) to root@172.181.191.191(172.181.191.191:22) failed!
SSH Configuration Check Failed!
 at /usr/local/bin/masterha_check_ssh line 44.





另外一种表现，就是第二次执行账号切换时报错  sudo su -


MySQL 有关MHA搭建与切换的几个错误log汇总


解决方案在root账号下，执行以下命令:





chage -M 99999 root





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