dons

Resolve <container-id>.docker.local to the ip of that container via DNS.

usage

$ ./dons
running server on 127.0.0.1:8053
# somewhere else ...
$ dig @127.0.0.1 -p 8053 53a98c2ac.docker.local
[...]
;; ANSWER SECTION:
53a98c2ac.docker.local. 0       IN      A       172.17.0.11

To use it directly, you have to run it as ./dons 127.0.0.1:53 and configure it as your DNS server:

# /etc/resolv.conf
nameserver 127.0.0.1

However, you need root privileges to do that, so you might want to install dnsmasq and configure it as follows in addition to the above:

# /etc/dnsmasq.conf
server=/docker.local/127.0.0.1#8053

The you can run ./dons as a regular user.

installation

Use a binary release, or build it yourself using go get . && go build.

If you want to install it permanently and have dnsmasq installed, run sudo make install.

To make it work with NetworkManager, add dns=dnsmasq to your config, as described on the arch wiki and systemctl disable dnsmasq.service, because NetworkManager will start it.