利用logrotate将mysql log截断

https://blog.pythian.com/mysql-log-rotation/

1.授权用户

CREATE USER 'log_rotate'@'localhost' IDENTIFIED BY '123456';
GRANT RELOAD,SUPER ON *.* to 'log_rotate'@'localhost';
FLUSH PRIVILEGES;

2.配置登录信息

• 2.1 密文

mysql_config_editor set \
  --login-path=logrotate \
  --host=localhost \
  --user=log_rotate \
  --port 3306 \
  --password

• 2.2 或者普通明文登录

bash # vi /root/.my.cnf

[client]
user=log_rotate
password='<ENTER PASSWORD HERE>'

bash # chmod 600 /root/.my.cnf

3.测试连接

[root@master logrotate.d]# mysqladmin --login-path=logrotate ping
mysqld is alive

4.确认log路径

mysql --login-path=logrotate -e "show global variables like 'slow_query_log_file'"
mysql --login-path=logrotate -e "show global variables like 'log_error'"

5.logrotate内容

vi /etc/logrotate.d/mysql

/mysqlData/dataerror.log /mysqlData/dataslow.log {
  daily
  create 660 mysql mysql
  dateext
  dateformat -%Y%m%d.%s
  nocopytruncate
  olddir oldlog
  rotate 30
  missingok
  nocompress
  sharedscripts
  notifempty
  postrotate
    if test -x /usr/local/mysql/bin/mysqladmin &&
      env HOME=/root /usr/local/mysql/bin/mysqladmin --login-path=logrotate ping > /dev/null 2>&1
    then
      env HOME=/root/ /usr/local/mysql/bin/mysql --login-path=logrotate -e 'select @@global.long_query_time into @lqt_save; set global long_query_time=2000; set global slow_query_log=0; select sleep(2); FLUSH ERROR LOGS; FLUSH SLOW LOGS;select sleep(2); set global long_query_time=@lqt_save; set global slow_query_log=1;' > /var/log/mysqladmin.flush-logs 2>&1
    fi
  endscript
}

6.crontab

59 23 * * * /usr/sbin/logrotate --force /etc/logrotate.d/mysql