EDIT - 

I changed the IP of my Unraid server and the DNS addresses within Resolv.conf are still the old ones.

 

The rest is prior to me figuring that out.

 

The short version is, 

I've configured a DNS server (my pfsense box) within Unraid and currently, it's not able to resolve anything.

I'm connected to the same subnet and can use the DNS server, it's the only DNS server that is reachable.

I did just change Unraids management address and placed it in a different network, I've not rebooted the system but most things seem to be coming back online.

 

Still investigating it but thought I'd post and ask in case there is something i'm missing.

 

Other random information

I understand Docker should always use the DNS that Unraid puts in resolv.conf and that dockers use 127.0.0.1 unless told otherwise.

 

I'm seeing a lot of hits to outside DNS servers that were configured prior to the change. Ok while typing this I really should go check the contents of resolv.conf

 

root@Tower:~# cat /etc/resolv.conf
# Generated entries:
nameserver 10.4.0.1
nameserver 8.8.4.4
nameserver 8.8.8.8
root@Tower:~#

 

OK Back to the top of the post!

 

 

 

 

Did you make the changes from the GUI -> Network settings?

 

Yes.

 

Updated GUI with new IP, Gateway and DNS on the main interface, removed a couple of VLANS and changed some gateway metrics. Saved it.

Quickly changed the port on the switch to a different vlan as the servers main port was switching to new network and unraid came up with the new IP address.

 

GUI listed the correct DNS address, I had no dns resolution within unraid and firewall logs showed attempted access to the old addresses.

Resolv.conf held the old entires.

 

I just edited the file myself for the moment. 

 

Attached diag taken at the time and just prior to me updating resolv.conf

 

 

 

 

 

tower-diagnostics-20170807-1924.zip

I've made no changes to the network settings since modifying resolv.conf manually and making the post.

 

My Unraid GUI still shows the correct IP for DNS.

 

But resolv.conf has been automatically updated with googles DNS since yesterday. 

 

root@Tower:~# cat /etc/resolv.conf
# Generated entries:
nameserver 8.8.4.4
nameserver 8.8.8.8
root@Tower:~# uptime
01:24:22 up 10 days,  6:27,  1 user,  load average: 2.94, 2.93, 3.22