My ODROID stops responding for a few minutes

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My ODROID stops responding for a few minutes

Unread postby WhiskerBiscuit » Sat May 12, 2018 1:50 pm

I’m running Ubuntu on an C2

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Welcome to Ubuntu 16.04.4 LTS (GNU/Linux 3.14.79-117 aarch64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage
Last login: Thu May 10 02:00:02 2018 from 172.16.68.56
root@odroid64:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"
root@odroid64:~#

The server runs PiHole that provides DNS and ad blocking for my entire network. My router assigns this as the DNS server for all DHCP clients. The server also runs OpenVPN, but there are no connections open when I am having the following issue:

I’ve started having problems where I can’t browse the internet. I quickly discovered I couldn’t ping any sites, but I could ping with IP address, such as Google’s DNS server 8.8.4.4. I figured there was a problem with my PiHole DNS server so I tried a SCP terminal connection, but that wouldn’t start. Then I tried pinging the C2 itself, and that wasn’t responding. After a few minutes I was about to go power cycle the C2, but then the ping started responding, and everything was working correctly again. I’ve no idea what happened. Maybe the C2 crashed and rebooted, maybe a service crashed and restarted, it’s a mystery. This has happened to me twice in the last couple of days.

Is there a log file somewhere that I can examine the time period where things stopped and started working again that might give me a clue as to why the server is non-responsive? I’m running this headless, but I suppose I could plug in something to the HDMI port and see what it looks like when it goes down.
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Re: My ODROID stops responding for a few minutes

Unread postby odroid » Mon May 14, 2018 5:41 am

Can you check the governor settings?
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cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor


If it is not "performance", try to change it.
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echo 'GOVERNOR="performance"' | sudo tee /etc/default/cpufrequtils; sudo update-rc.d ondemand disable; systemctl mask ondemand;
reboot


Anyway, it is worth to check "/var/log/syslog" file.
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