DNS on my unRAID system has stopped working completely. My array, SMB, docker containers, VMs, everything else works fine except things like Plex which need DNS to function. I can ping IP addresses inside and outside, but I can not ping any named address.

 

I used to have Pi-Hole installed, but I saw many people had problems with it so I removed that container. While it was installed, and currently, I have been using 9.9.9.9, 8.8.8.8, and 1.1.1.1 as the DNS which had been working just fine until last week.

 

I have changed the DNS to static, I have also set the IP to DHCP and neither are working. I have also set the DNS to my router (USG4Pro) with no luck. The unRAID server has been rebooted multiple times. Currently the VMs and Docker are off.

 

The only thing I see as major problem is that /etc/resolv.conf is empty, completely blank. If I add in the nameservers everything works fine until I reboot of course. Also /boot/config/network.cfg looks fine and has the nameservers listed. Another thing I notice is that /etc/resolv.avahi.conf is populated correctly.

Any ideas?

tower-diagnostics-20220210-0655.zip

Edited February 10, 20224 yr by quietas

On a side note, I see lots of posts with similar issues but no solutions. Why people? I hate it when people post a problem and don't come back to post what worked in the end.

I found this post from a couple years back. It talked about avahi and how to disable it. I did not have a /boot/config/share.cfg so I made one and added shareAvahiEnabled="no" as the only thing in it. This seems to work once I rebooted the server.

https://forums.unraid.net/topic/91825-dns-servers-not-retained-in-resolvconf-on-unraid-reboot/

Is this correct and will it break anything in the long run other than not using Apples Bonjour/Avahi stuff that I don't use anyway?

If anyone is looking at this in the future, this is what I did.

nano /boot/config/share.cfg
shareAvahiEnabled="no"
<ctrl-x>
<enter>

 

Edited February 10, 20224 yr by quietas