Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a low memory VPS that mysql and the swap file crash out every morning at exactly 0300. There are no cronjobs on the system that have been configured. The server is a basic LAMP development server and all settings are defaults.

 cat /var/log/messages|grep -i mysql
Jun 25 20:51:07 vader sshd[72946]: error: PAM: authentication error for mysql from
Jun 28 03:01:34 vader kernel: pid 848 (mysqld), uid 88, was killed: out of swap space
Jun 28 03:01:34 vader kernel: pid 93947 (mysqld), uid 88, was killed: out of swap space
Jun 29 03:01:32 vader kernel: pid 98578 (mysqld), uid 88, was killed: out of swap space
Jun 29 03:01:33 vader kernel: pid 2586 (mysqld), uid 88, was killed: out of swap space

My swap file is 1 gig. I tried 2 gigs, the same pattern of crashing begins after a week.

 ls -l /home/sw*
-rw-------  1 root  wheel  1073741824 Jun 21 13:19 /home/swap0

Even worse, I can't re-initialize the swap file without a reboot

swapoff -a mdconfig -a -t vnode -f /home/swap0 -u 0 && swapon /dev/md0 mdconfig: ioctl(/dev/mdctl): Device busy

I don't have much memory to work with:

# vmstat
 procs      memory      page                    disks     faults         cpu
 r b w     avm    fre   flt  re  pi  po    fr  sr vt0 md0   in   sy   cs us sy id
 1 0 3   1709M   491M    44   0   0   0    54  29   0   0    4  135   94  0  0 100

But I shouldn't need it if mysql was running correctly.

Two questions.

no. 1) How do I reinitialize a swap file after it crashes so I don't have to reboot (I would just like to know because everything I find on google fails)?

no. 2) How do I stabilize mysql so that it doesn't burp at 0300 for massive amounts of memory?

share|improve this question
1. There's a scheduled task somewhere. 2. You can't, your system ran out of memory and it's in an unstable state at best. Reboot. 3. Maybe you should get more RAM added to your VPS. – Sammitch Jun 29 '15 at 18:15
This issue still exist removing the only error in logs, a DHCP query. After removing DHCP and setting a static IP, same issue. :( – NIX Aug 9 '15 at 1:16

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.