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Old 2016-07-11, 22:50   #1
(loop (#_fork))
fivemack's Avatar
Feb 2006
Cambridge, England

193616 Posts
Default Mysterious reboots

Twice in the last ten days, I've logged into my compute node 'wheat' to find no jobs running and an uptime of a few hours - it's silently rebooted. Nothing useful appears in the logs in /var/log.

What's the normal cause of this? The machine is just over three years old, does it make sense to replace the power supply?
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Old 2016-07-11, 23:15   #2
firejuggler's Avatar
Apr 2010
Over the rainbow

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Old 2016-07-11, 23:16   #3
Mark Rose
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Jan 2013

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What are the last messages in /var/log/syslog before the fresh boot logs?

Power supply is my guess. Is the computer on battery-backup?
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Old 2016-07-12, 02:17   #4
Dec 2014

3778 Posts

Toddler in the home that likes to push buttons?

But seriously, I agree with power supply as most likely and cheapest to try.
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Old 2016-07-12, 03:24   #5
Romulan Interpreter
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Jun 2011

240418 Posts

Dust clogs? (which translates to heat, as asked by the posters above, already).
When was last time you dusted it and re-seat the CPU? (like in "cleaning the cooler of the old paste and adding a new paste").
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Old 2016-07-12, 07:23   #6
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fivemack's Avatar
Feb 2006
Cambridge, England

2·7·461 Posts

The computer's not on battery backup. It's in an outbuilding with five other computers and none of the others have glitched in the last five months. Could well be heat, I suppose - it's on a shelf with other computers to the left and right of it. Haven't cleaned it since I bought it three years ago, it's been running in the shed all that time.

Last fiddled with by fivemack on 2016-07-12 at 07:24
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Old 2016-07-12, 09:10   #7
Just call me Henry
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Sep 2007
Liverpool (GMT/BST)

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I would sling in a spare power supply if you have one. With that many pcs a spare power supply will end up getting used for testing if nothing else. I used to keep a power supply with a noisy dying fan around to check whether the power supply was the problem. My current pc has been through a good few power supplies. The last one got really clogged with dust.
The rest of the pc could probably do with dusting as well.
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Old 2016-07-12, 10:42   #8
xilman's Avatar
May 2003
Down not across

5·17·137 Posts

Originally Posted by fivemack View Post
Haven't cleaned it since I bought it three years ago, it's been running in the shed all that time.
Spiders and/or mice?

Spiders are common inside unattended computers running outside clean machine rooms; their webs are extremely good at catching dust and hindering airflow. I once found a vacated murine nest inside a machine.
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