Linux内核OOM保护机制（查看系统日志）

kill:

参考文献：

转载：https://www.cnblogs.com/felixzh/p/9238274.html
转载 : https://blog.youkuaiyun.com/zgrjkflmkyc/article/details/77645570

人工维护或进程在Linux中使用内存最大 时，保护机制自动kill
我们应该估算系统内存，合理分配
解决方法：赶快升级，把不重要的服务停了，把内存加大一点。

看系统日志

[root@hadoop001 ~]# cd /var/log
[root@hadoop001 log]# ll
total 708952
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.ifcfg.log
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.log
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.program.log
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.storage.log
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.syslog
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.xlog
-rw-------. 1 root  root          0 Jul  6  2018 anaconda.yum.log
drwxr-x---. 2 root  root       4096 Jul 11 07:32 audit
-rw-r--r--  1 root  root       1118 Jul  9 03:06 boot.log
-rw-------  1 root  utmp   44162304 Jul 12 02:26 btmp
-rw-------. 1 root  utmp   61329792 Apr  1 03:29 btmp-20190401
-rw-------  1 root  utmp  170359680 May  1 03:50 btmp-20190501
-rw-------  1 root  utmp  184469760 Jun  1 03:42 btmp-20190601
-rw-------  1 root  utmp  141014016 Jul  1 03:07 btmp-20190701
drwxr-xr-x  2 root  root       4096 Jul  1 03:08 ConsoleKit
-rw-------  1 root  root     197953 Jul 12 02:30 cron
-rw-------  1 root  root     129550 Jun 16 03:35 cron-20190616
-rw-------  1 root  root     121631 Jun 23 03:32 cron-20190623
-rw-------  1 root  root     199284 Jun 30 03:19 cron-20190630
-rw-------  1 root  root     286157 Jul  7 03:50 cron-20190707
-rw-r--r--  1 root  root      21999 Jul  9 03:06 dmesg
-rw-r--r--  1 root  root      21999 Jun 30 01:22 dmesg.old
-rw-r--r--. 1 root  root          0 Jul  6  2018 dracut.log
drwx------  2 root  root       4096 Jul 10 03:50 httpd
-rw-r--r--. 1 root  root     152716 Jul 12 02:29 lastlog
-rw-------  1 root  root          0 Jul  7 03:50 maillog
-rw-------  1 root  root          0 Jun  9 04:22 maillog-20190616
-rw-------  1 root  root          0 Jun 16 03:35 maillog-20190623
-rw-------  1 root  root        117 Jun 23 14:42 maillog-20190630
-rw-------  1 root  root          0 Jun 30 03:19 maillog-20190707
-rw-------  1 root  root      32791 Jul 11 23:26 messages
-rw-------  1 root  root      34005 Jun 16 03:35 messages-20190616
-rw-------  1 root  root      71874 Jun 23 03:32 messages-20190623
-rw-------  1 root  root      38307 Jun 30 03:19 messages-20190630
-rw-------  1 root  root       2887 Jul  7 03:50 messages-20190707
-rw-r-----  1 mysql mysql         0 Jun 30 03:11 mysqld.log
-rw-r-----  1 mysql mysql       865 Jun 30 01:02 mysqld.log.rpmsave
drwxr-xr-x. 2 ntp   ntp        4096 Jan 26  2018 ntpstats
drwx------  2 root  root       4096 Mar 16  2015 ppp
drwxr-xr-x. 2 root  root       4096 Jul 12 00:00 sa
-rw-------  1 root  root    8397041 Jul 12 02:29 secure
-rw-------  1 root  root   39115735 Jun 16 03:35 secure-20190616
-rw-------  1 root  root   18686664 Jun 23 03:31 secure-20190623
-rw-------  1 root  root   25685678 Jun 30 03:17 secure-20190630
-rw-------  1 root  root   30867737 Jul  7 03:49 secure-20190707
-rw-------  1 root  root          0 Jul  7 03:50 spooler
-rw-------  1 root  root          0 Jun  9 04:22 spooler-20190616
-rw-------  1 root  root          0 Jun 16 03:35 spooler-20190623
-rw-------  1 root  root          0 Jun 23 03:32 spooler-20190630
-rw-------  1 root  root          0 Jun 30 03:19 spooler-20190707
-rw-------. 1 root  root          0 Jul  6  2018 tallylog
-rw-r--r--  1 root  root          0 Jul  6  2018 wpa_supplicant.log
-rw-rw-r--. 1 root  utmp     221184 Jul 12 02:29 wtmp
-rw-------. 1 root  root       1915 Jun 30 03:11 yum.log

[root@hadoop001 log]# tail -f messages   在这里看系统日志，会记录
Jul  9 03:06:55 hadoop001 ntpd[1147]: Listen normally on 3 eth0 10.9.6.136 UDP 123
Jul  9 03:06:55 hadoop001 ntpd[1147]: Listening on routing socket on fd #20 for interface updates
Jul  9 03:06:55 hadoop001 ntpd[1147]: 0.0.0.0 c016 06 restart
Jul  9 03:06:55 hadoop001 ntpd[1147]: 0.0.0.0 c012 02 freq_set ntpd 15.848 PPM
Jul  9 03:07:02 hadoop001 ntpd[1147]: 0.0.0.0 c615 05 clock_sync
Jul  9 21:31:06 hadoop001 auditd[963]: Audit daemon rotating log files
Jul 10 10:15:16 hadoop001 auditd[963]: Audit daemon rotating log files
Jul 11 02:41:36 hadoop001 auditd[963]: Audit daemon rotating log files
Jul 11 07:32:33 hadoop001 auditd[963]: Audit daemon rotating log files
Jul 11 23:26:55 hadoop001 kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
^C
[root@hadoop001 log]#