The unit mysql.service has entered the 'failed' state with result 'timeout'
Database 2025/3/18 14:31:44 点击：不统计
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mysql从库在启动时,无法启动，没有任何报错，后来发现是 磁盘 剩余不足，不能load完毕历史innodb undo文件导致
下面是提示的错误：
命令行提示：
service mysqld startRedirecting to /bin/systemctl start mysqld.service Job for mysqld.service failed because the control process exited with error code. See "systemctl sta tus mysqld.service"and "journalctl -xe" for details.
日志错误：
Mar 17 21:34:54 root systemd[1]: mysql.service: Killing process 7768 (n/a) wi>
Mar 17 21:34:54 root systemd[1]: mysql.service: Killing process 7770 (n/a) wi>
Mar 17 21:34:54 root systemd[1]: mysql.service: Killing process 7771 (n/a) wi>
Mar 17 21:34:55 root systemd[1]: mysql.service: Failed with result 'timeout'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit mysql.service has entered the 'failed' state with result 'timeout'.
Mar 17 21:34:55 root systemd[1]: Failed to start MySQL Community Server.
-- Subject: A start job for unit mysql.service has failed
排查 步骤：
1. 查看 mysql 错误日志
sudo cat /var/log/mysql/error.log | tail -n 100
或者
sudo cat /var/log/mysql/[主机名称].err | tail -n 100
2. 如果没有任何报错Error 那看一下磁盘剩余
df -h
3. 启动时, 查看 内存使用，如果 启动时到一定额度不能正常启动就要看一下磁盘使用情况。
删除磁盘部分不需要的内容后 ，再次启动即可。
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