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The system is : Debian 8.1 run on embedded system with ARM7V CPU 2 GB RAM and 4 GB flash.

The system sporadically restart itself couple time in day, before a week with appear very rare.

What is the best way find a reason of such behavior ?

  • have logs, preferably not just on storage, but on serial console or via network (because storage can be lost at this restart if it's really some driver/hardware etc. failure) – A.B Mar 15 at 19:10
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    How many Amperes on the power supply? Any realtek wifi? – Rui F Ribeiro Mar 15 at 19:14
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    If the device is under high load (with crap drivers typical of arm) sometimes the Watchdog will reboot the device – user1133275 Mar 15 at 22:14
  • I use POE as power supply, does it sensible to changes on AC netork changes. – Sergey Meerovich Mar 16 at 5:46
  • About high load how can I catch that hw watchdog ran – Sergey Meerovich Mar 16 at 5:47
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I first would run the last command and see when the restarts were happening, and once I pinpointed a time look in the system logs generally /var/log/messages, that would run out application or OS related issues. POE should be okay, but is the switch powering off the interface? I would also look at the switches logs.

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