Dnasmasq cannot start due to port 53 already in use

[jclaveau]

Sometimes, systemd blocks the port 53 endless (on Ubuntu 19.04 at least).

Short term solution

sudo systemd-resolve stop

A long term solution?
https://medium.com/@niktrix/getting-rid-of-systemd-resolved-consuming-port-53-605f0234f32f

[jclaveau]

Possible solutions : https://unix.stackexchange.com/questions/304050/how-to-avoid-conflicts-between-dnsmasq-and-systemd-resolved

in /etc/systemd/resolved.conf

DNSStubListener=no

Then

sudo systemd-resolve restart
And use dnsmasq as resolver.

Also bind-interfaces in dnsmasq config could fix this.

[jclaveau]

sudo netstat -anlp | grep -w LISTEN
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 14413/docker-proxy
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 11076/systemd-resol

Glad to bind-interfaces