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
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 -
解决方案在root账号下，执行以下命令:
chage -M 99999 root以上就是MySQL 有关MHA搭建与切换的几个错误log汇总的详细内容，更多关于MySQL MHA搭建与切换的资料请关注其它相关文章！
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