![大约 1 天后,我就无法访问我的 VPS(Centos7),除非我重启服务器](https://linux22.com/image/711334/%E5%A4%A7%E7%BA%A6%201%20%E5%A4%A9%E5%90%8E%EF%BC%8C%E6%88%91%E5%B0%B1%E6%97%A0%E6%B3%95%E8%AE%BF%E9%97%AE%E6%88%91%E7%9A%84%20VPS%EF%BC%88Centos7%EF%BC%89%EF%BC%8C%E9%99%A4%E9%9D%9E%E6%88%91%E9%87%8D%E5%90%AF%E6%9C%8D%E5%8A%A1%E5%99%A8.png)
我有一个 CentOS 7 VPS,安装了 Webmin 和 Virtualmin。我在这个服务器上有多个域以及邮件服务器(Postfix、Dovecot)。有时我无法访问它(无论是从 webmin 使用 IP 地址还是 SSH),直到我从提供商面板重新启动机器。我如何检测问题?我必须查看哪些日志?
以下是“grep -i 'killed process' /var/log/messages”的输出
Oct 2 13:08:32 server kernel: Killed process 2840 (mysqld) total-vm:1641792kB, anon-rss:20564kB, file-rss:0kB
Oct 3 04:24:09 server kernel: Killed process 2874 (mysqld) total-vm:1637124kB, anon-rss:11628kB, file-rss:0kB
Oct 3 05:16:05 server kernel: Killed process 26933 (sh) total-vm:11636kB, anon-rss:4kB, file-rss:140kB
Oct 3 05:16:05 server kernel: Killed process 26884 (/usr/libexec/we) total-vm:165912kB, anon-rss:28kB, file-rss:132kB
Oct 3 05:16:05 server kernel: Killed process 26753 (/usr/libexec/we) total-vm:161776kB, anon-rss:80kB, file-rss:16kB
Oct 3 05:16:05 server kernel: Killed process 26852 (/usr/libexec/we) total-vm:132660kB, anon-rss:2476kB, file-rss:12kB
Oct 3 05:16:05 server kernel: Killed process 26903 (/usr/libexec/we) total-vm:132656kB, anon-rss:1964kB, file-rss:12kB
Oct 3 05:16:05 server kernel: Killed process 26715 (php-cgi) total-vm:486184kB, anon-rss:5772kB, file-rss:136kB
Oct 3 05:16:05 server kernel: Killed process 26953 (sh) total-vm:11636kB, anon-rss:0kB, file-rss:4kB
Oct 3 05:16:05 server kernel: Killed process 26749 (/usr/libexec/we) total-vm:113144kB, anon-rss:1444kB, file-rss:148kB
Oct 3 05:16:05 server kernel: Killed process 26954 (sh) total-vm:11636kB, anon-rss:4kB, file-rss:0kB
Oct 3 05:16:05 server kernel: Killed process 26795 (/usr/libexec/we) total-vm:113144kB, anon-rss:1132kB, file-rss:0kB
Oct 3 05:16:05 server kernel: Killed process 27303 (mysqld) total-vm:288396kB, anon-rss:9340kB, file-rss:0kB
Oct 3 05:16:05 server kernel: Killed process 27109 (php-cgi) total-vm:453836kB, anon-rss:2144kB, file-rss:20488kB
Oct 3 05:16:05 server kernel: Killed process 27111 (php-cgi) total-vm:453836kB, anon-rss:2308kB, file-rss:20000kB
Oct 3 05:16:05 server kernel: Killed process 26851 (/usr/libexec/we) total-vm:105188kB, anon-rss:2620kB, file-rss:4kB
Oct 3 05:16:05 server kernel: Killed process 26898 (/usr/libexec/we) total-vm:105188kB, anon-rss:2660kB, file-rss:44kB
Oct 3 05:34:26 server kernel: Killed process 27190 (php-cgi) total-vm:453836kB, anon-rss:2160kB, file-rss:20624kB
Oct 3 05:57:53 server kernel: Killed process 27186 (php-cgi) total-vm:453836kB, anon-rss:2324kB, file-rss:20280kB
Oct 3 06:00:46 server kernel: Killed process 27180 (php-cgi) total-vm:453836kB, anon-rss:2520kB, file-rss:20312kB
Oct 3 06:02:00 server kernel: Killed process 27187 (php-cgi) total-vm:453836kB, anon-rss:2240kB, file-rss:20076kB
Oct 3 06:04:16 server kernel: Killed process 2889 (named) total-vm:245060kB, anon-rss:512kB, file-rss:0kB
Oct 3 06:11:19 server kernel: Killed process 26709 (php-cgi) total-vm:471000kB, anon-rss:2228kB, file-rss:380kB
Oct 3 06:12:28 server kernel: Killed process 27308 (/usr/libexec/we) total-vm:96044kB, anon-rss:6292kB, file-rss:528kB
Oct 3 06:12:48 server kernel: Killed process 26788 (php-cgi) total-vm:464152kB, anon-rss:1852kB, file-rss:908kB
Oct 3 06:57:17 server kernel: Killed process 27465 (/usr/libexec/we) total-vm:102616kB, anon-rss:5608kB, file-rss:360kB
Oct 3 07:32:00 server kernel: Killed process 27457 (/usr/libexec/we) total-vm:102620kB, anon-rss:5080kB, file-rss:380kB
Oct 3 07:55:06 server kernel: Killed process 27474 (/usr/libexec/we) total-vm:102616kB, anon-rss:5156kB, file-rss:180kB
答案1
首先检查内存占用情况。您的某些服务可能会泄漏内存,因此内存消耗可能会随着时间的推移而增加。
如果你没有安装 sar,请进行调整。这里有一个非常好的指南:
http://www.thegeekstuff.com/2011/03/sar-examples/?utm_source=feedburner
答案2
看来你有内存泄漏。首先检查你的日志。
grep -i 'killed process' /var/log/messages
然后你可以尝试这个技巧来找出哪个进程占用了你的内存。将此命令添加为 crontab 任务:
ps aux | awk '{mem[$11]+=int($6/1024)}; {cpuper[$11]+=$3};{memper[$11]+=$4}; END {for (i in mem) {print cpuper[i]"% ",memper[i]"% ",mem[i]" MB ",i}}' | sort -k3nr | head -n 5 >> /tmp/memoryleak.log
现在您可以检查 /var/log/memoryleak.log
答案3
除了 sar 之外,您还可以安装在顶上并为其配置日志以查找导致 CPU/RAM 使用率过高的确切进程。