dnsmasq won't start

[Tom H]

On Mon, Jan 25, 2016 at 2:30 PM, Patrick O'Callaghan
<pocallaghan at gmail.com> wrote:
>
> For some reason I'm getting this:
>
> $ systemctl status dnsmasq
> ● dnsmasq.service - DNS caching server.
>    Loaded: loaded (/usr/lib/systemd/system/dnsmasq.service; enabled; vendor preset: disabled)
>    Active: failed (Result: exit-code) since Mon 2016-01-25 13:27:16 GMT; 1s ago
>   Process: 3502 ExecStart=/usr/sbin/dnsmasq -k (code=exited, status=2)
>  Main PID: 3502 (code=exited, status=2)
>
> Jan 25 13:27:16 bree systemd[1]: Started DNS caching server..
> Jan 25 13:27:16 bree systemd[1]: Starting DNS caching server....
> Jan 25 13:27:16 bree dnsmasq[3502]: dnsmasq: failed to create listening socket for port 53: Address already in use
> Jan 25 13:27:16 bree dnsmasq[3502]: failed to create listening socket for port 53: Address already in use
> Jan 25 13:27:16 bree systemd[1]: dnsmasq.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
> Jan 25 13:27:16 bree systemd[1]: dnsmasq.service: Unit entered failed state.
> Jan 25 13:27:16 bree systemd[1]: dnsmasq.service: Failed with result 'exit-code'.
>
> Can't figure out what is sitting on port 53 (the DNS port). I'm not
> running bind.

Unbound?

NetworkManager? (check the "dns=" line in
"/etc/NetworkManager/NetworkManager.conf", if it exists.)

Check the listening ports with ss.