[CentOS] CentOS 6 spontaneous reboots
bgee at campercaver.net
Mon May 30 00:10:23 UTC 2016
Hello everyone -
My CentOS 6.8 server has been rebooting itself every 2 to 4 hours for the last
several days. I do not know where to look for logs that might give a clue what
the problem is. There are no unusual entries in /var/log/messages. I looked
over other log files in /var/log and found nothing suggestive. Where else can I
By luck I saw the beginning of a reboot on the server console. Normally I have
other systems up on the KVM switch. It appears to have dumped core. I don't
know where to look for the core dump files. They are not in /root.
The problem started while the server was still 6.7. It had almost 290 days of
uptime when the problem started. I have tried the following, none of which
made any difference.
I ran the upgrade to 6.8.
I tried stopping non-essential services two at a time.
I ran MemTest 86+. No memory errors were found.
I turned off swap.
I unplugged the USB hard drive that I use to hold daily and weekly backups. It
was being recognized as /dev/sda for some reason.
Lm_sensors shows the processor running between 45 and 50C. Hddtemp
shows the hard drives running between 35 and 40C. LM_Sensors does not
produce valid data on fan speed, but a visual check shows all fans running
normally and no build-up of dust.
The system is behind a big UPS that runs several other systems. The UPS log
file does not record any power failures and none of the other systems are
rebooting at random.
What else can I look at?
Thanks - Bill Gee
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