http://mageddo.github.io/dns-proxy-server/docs/features
There is a opensource application that solves this issue, it's called DNS Proxy Server
It's a DNS server that solves containers hostnames, if could not found a hostname that matches then solve it from internet as well
Start the DNS Server
$ docker run --hostname dns.mageddo --name dns-proxy-server -p 5380:5380 \
-v /var/run/docker.sock:/var/run/docker.sock \
-v /etc/resolv.conf:/etc/resolv.conf \
defreitas/dns-proxy-server
It will set as your default DNS automatically (and recover to the original when stops)
Start your container for test
docker-compose up
docker-compose.yml
version: '2'
services:
redis:
container_name: redis
image: redis:2.8
hostname: redis.dev.intranet
network_mode: bridge # that way he can solve others containers names even inside, solve elasticsearch, for example
elasticsearch:
container_name: elasticsearch
image: elasticsearch:2.2
hostname: elasticsearch.dev.intranet
Now solve your containers hostnames
from host
$ nslookup redis.dev.intranet
Server: 172.17.0.2
Address: 172.17.0.2#53
Non-authoritative answer:
Name: redis.dev.intranet
Address: 172.21.0.3
from another container
$ docker exec -it redis ping elasticsearch.dev.intranet
PING elasticsearch.dev.intranet (172.21.0.2): 56 data bytes
As well it solves internet hostnames
$ nslookup google.com
Server: 172.17.0.2
Address: 172.17.0.2#53
Non-authoritative answer:
Name: google.com
Address: 216.58.202.78