1. MySQL5.7.21启动时报错:

[ERROR] Can't find error-message file '/data/mysql/3307/share/errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.

2. 登录MySQL查看系统全局参数:

mysql> show global variables like '%messages%';
+-----------------+-----------------------+
| Variable_name   | Value                 |
+-----------------+-----------------------+
| lc_messages     | en_US                 |
| lc_messages_dir | /data/mysql/share/ |
+-----------------+-----------------------+

3. 然后发现lc_messages_dir的目录在/data/mysql/share/， 然后到系统层面查看

[root@Master mysql]# ll
total 4
drwxr-xr-x 6 mysql mysql 4096 Aug 31 11:47 3307

4. 从系统相应路径下并没有发现share目录，然后还是在系统层面找errmsg.sys文件

[root@Master mysql]# find / -name errmsg.sys

/opt/mysql3307/share/serbian/errmsg.sys
/opt/mysql3307/share/dutch/errmsg.sys
/opt/mysql3307/share/russian/errmsg.sys
/opt/mysql3307/share/swedish/errmsg.sys
/opt/mysql3307/share/portuguese/errmsg.sys
/opt/mysql3307/share/english/errmsg.sys
/opt/mysql3307/share/italian/errmsg.sys
/opt/mysql3307/share/czech/errmsg.sys
/opt/mysql3307/share/ukrainian/errmsg.sys
/opt/mysql3307/share/estonian/errmsg.sys
/opt/mysql3307/share/norwegian-ny/errmsg.sys
/opt/mysql3307/share/korean/errmsg.sys
/opt/mysql3307/share/french/errmsg.sys
/opt/mysql3307/share/spanish/errmsg.sys
/opt/mysql3307/share/hungarian/errmsg.sys
/opt/mysql3307/share/greek/errmsg.sys
/opt/mysql3307/share/german/errmsg.sys
/opt/mysql3307/share/polish/errmsg.sys
/opt/mysql3307/share/japanese/errmsg.sys
/opt/mysql3307/share/romanian/errmsg.sys
/opt/mysql3307/share/norwegian/errmsg.sys
/opt/mysql3307/share/bulgarian/errmsg.sys
/opt/mysql3307/share/slovak/errmsg.sys
/opt/mysql3307/share/danish/errmsg.sys

5. 查询了下mygtid.cnf当中并没有设定此参数，然后就把lc-messages-dir加入到mygtid.cnf当中

[root@Master mysql]# cat /data/mysql/3307/conf/mygtid.cnf
[mysqld]
##########basic settings###################
port = 3307
bind-address = 0.0.0.0
basedir = /data/mysql/3307
datadir = /data/mysql/3307/data
socket = /data/mysql/3307/mysql.sock
lc-messages = en_US
lc-messages-dir = /opt/mysql3307/share

6. 关闭MySQL实例(因为lc-messages-dir系统参数只能在实例启动的时候修改；lc-messages是动态参数可在线调整)

[root@Master mysql]# /opt/mysql3307/bin/mysqladmin -uroot -p -S /data/mysql/3307/mysql.sock shutdown

7. 重新启动MySQL实例

[root@DCSDR213 mysql]# /opt/mysql3307/bin/mysqld --defaults-file=/data/mysql/3307/conf/mygtid.cnf &

8. 查看lc-messages-dir参数

9. 此时error.log当中没有发现报错了

参考:

https://dev.mysql.com/doc/refman/5.7/en/error-message-language.html

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