Use the unbound dns server

docker filters out the localhost in /etc/resolv.conf by design
and will use the Google DNS nameservers as fallback.

https://docs.docker.com/engine/userguide/networking/configure-dns/

baseimage/initializeBaseUbuntuImage.sh

@@ -103,7 +103,7 @@ After=network.target docker.socket
 Requires=docker.socket
 
 [Service]
-ExecStart=/usr/bin/docker daemon -H fd:// --log-driver=journald --exec-opt native.cgroupdriver=cgroupfs
+ExecStart=/usr/bin/docker daemon -H fd:// --log-driver=journald --exec-opt native.cgroupdriver=cgroupfs --dns 127.0.0.1
 MountFlags=slave
 LimitNOFILE=1048576
 LimitNPROC=1048576