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腾讯云主机每天早上内存暴涨引发CPU满载问题

admin2019年3月6日 13:38 Django | Linux | Nginx 190人已围观

腾讯云主机每天早上内存暴涨引发CPU满载问题 系统:Debian9 问题,每天固定时间段,总会导致CPU占用100%,通过`top`发现`kswapd0`占用内存,本来内存1G就很小。 [Linux设置大内存页解决kswapd0进程过渡消耗CPU的问题](https://blog.csdn.net/m0_37886429/article/details/78487324) 通过系统日志发现是无人值守自动更新导致占用内存和CPU ## 系统日志 ```bash # 查看系统日志 Svr:~# tail -n 500 /var/log/syslog Mar 1 06:35:59 StarMeow-Svr systemd[1]: Starting Daily apt upgrade and clean activities... Mar 1 06:36:01 StarMeow-Svr CRON[15637]: (root) CMD (/usr/local/qcloud/stargate/admin/start.sh > /dev/null 2>&1 &) # 省略多条日志 Mar 1 07:04:46 StarMeow-Svr systemd[1]: Started Daily apt upgrade and clean activities. Mar 1 07:04:46 StarMeow-Svr systemd[1]: apt-daily-upgrade.timer: Adding 12min 54.290649s random time. Mar 1 07:04:46 StarMeow-Svr systemd[1]: apt-daily-upgrade.timer: Adding 15min 4.419940s random time. ``` 参考文档:https://superuser.com/questions/1327884/how-to-disable-daily-upgrade-and-clean-on-ubuntu-16-04 找到服务,参考 https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1615482 可以找到有关`apt-daily ***`说明,然后搜索到这个链接: https://wiki.debian.org/UnattendedUpgrades 讲解了Debian无人值守升级 ## 查看apt-daily计划 ```bash Svr:/etc/systemd/system/timers.target.wants# pwd /etc/systemd/system/timers.target.wants Svr:/etc/systemd/system/timers.target.wants# ls apt-daily.timer apt-daily-upgrade.timer # 查看文件,这些文件都是/lib/systemd/system/对应文件软连接过来的! # 用于下载 Svr:/etc/systemd/system/timers.target.wants# cat apt-daily.timer [Unit] Description=Daily apt download activities [Timer] OnCalendar=*-*-* 6,18:00 RandomizedDelaySec=12h Persistent=true [Install] WantedBy=timers.target # 用于升级 Svr:/etc/systemd/system/timers.target.wants# cat apt-daily-upgrade.timer [Unit] Description=Daily apt upgrade and clean activities After=apt-daily.timer [Timer] OnCalendar=*-*-* 6:00 RandomizedDelaySec=60m Persistent=true [Install] WantedBy=timers.target ``` ## 解决方法 ```bash Svr:/etc/systemd/system/timers.target.wants # 移除安装软件,没尝试 apt-get remove unattended-upgrades # 停止 Svr:/etc/systemd/system/timers.target.wants# systemctl stop apt-daily-upgrade.timer # 禁止,会在本地删除该文件 Svr:/etc/systemd/system/timers.target.wants# systemctl disable apt-daily-upgrade.timer Removed /etc/systemd/system/timers.target.wants/apt-daily-upgrade.timer. # 重启 Svr:/etc/systemd/system/timers.target.wants# systemctl daemon-reload ``` ```bash Svr:/lib/systemd/system# ls -l | grep 'apt-daily' -rw-r--r-- 1 root root 225 Jan 18 18:42 apt-daily.service -rw-r--r-- 1 root root 156 Jan 18 18:42 apt-daily.timer -rw-r--r-- 1 root root 238 Jan 18 18:42 apt-daily-upgrade.service -rw-r--r-- 1 root root 184 Mar 1 11:02 apt-daily-upgrade.timer -rw-r--r-- 1 root root 184 Jan 18 18:42 apt-daily-upgrade.timer.bak2019.03.01 ``` ## 恢复每日更新启动 用法:`ln -s 源文件 目标文件` ```bash Svr:/etc/systemd/system/timers.target.wants# ln -s /lib/systemd/system/apt-daily-upgrade.timer apt-daily-upgrade.timer Svr:/etc/systemd/system/timers.target.wants# ls -li total 0 262474 lrwxrwxrwx 1 root root 35 Jul 15 2017 apt-daily.timer -> /lib/systemd/system/apt-daily.timer 262252 lrwxrwxrwx 1 root root 43 Mar 1 11:04 apt-daily-upgrade.timer -> /lib/systemd/system/apt-daily-upgrade.timer # 恢复回来后,需要使用下面命令重新加载 Svr:/etc/systemd/system/timers.target.wants# systemctl daemon-reload ```

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