Resolve domains locally with docker engine DNS

custom-dns-docker.md

Custom DNS docker engine level

Depend of the init system of the OS:

Systems using Upstart and SysVinit

• Add in /etc/default/docker DOCKER_OPTS="--dns <DNS_IP_1> --dns <DNS_IP_2>"
• $ sudo service docker restart

Systems using SystemD

• Add in /etc/docker/daemon.json

{
	"dns": ["<DNS_IP_1>", "<DNS_IP_2>"]
}

• $ sudo service docker restart

Custom DNS per container

Docker run

• Add the parameters --dns=<DNS_IP_1> --dns=<DNS_IP_2>

Docker Compose

• Add in the docker-compose.yml

dns:
  - <DNS_IP_1>
  - <DNS_IP_2>

If does not work add a network_mode.

More info:

• https://docs.docker.com/engine/installation/linux/linux-postinstall/#specify-dns-servers-for-docker
• https://docs.docker.com/compose/compose-file/compose-file-v2/#dns