我注意到，当我登录服务器时，有时会收到来自 syslog@stock 的垃圾邮件。在这台服务器上，我运行着一个用 Laravel 构建的网站和一个运行着超过 20 个活跃用户的 Teamspeak 3 服务器。
我收到的信息是
Message from syslogd@stock at Jul 25 17:42:13 ...
t of memory [4188]
Message from syslogd@stock at Jul 25 17:42:13 ...
t of memory [4194]
Message from syslogd@stock at Jul 25 17:42:14 ...
t of memory [4202]
Message from syslogd@stock at Jul 25 17:42:14 ...
t of memory [4208]
Message from syslogd@stock at Jul 25 17:42:15 ...
t of memory [4214]
Message from syslogd@stock at Jul 25 17:42:15 ...
t of memory [4224]
Message from syslogd@stock at Jul 25 17:42:15 ...
t of memory [4233]
Message from syslogd@stock at Jul 25 17:42:16 ...
t of memory [4241]
我不明白这些信息的含义。
运行 CentOS @ 32GB Intel(R) Xeon(R) CPU E3-1245 V2 @ 3.40GHz
free -m
total used free shared buffers cached
Mem: 32070 15338 16732 0 409 5386
-/+ buffers/cache: 9541 22528
Swap: 1021 0 1021
答案1
以下是我针对自己的情况发现的问题。ulimit -a可以识别virtual memory (kbytes, -v) 10485760。如果任何进程的虚拟内存达到或试图超出限制，它将广播问题中提到的问题。htop比更有帮助top。
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 1031979
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 104
virtual memory (kbytes, -v) 10485760
file locks (-x) unlimited