update-docker-dns

Selectively expose docker containers by name.

[Install 1/3] Copy the script to where it belongs

sudo cp update-docker-dns.sh /usr/loca/bin

[Install 2/3] Add dnsmasq support

• If you have a Network Manager (most linux desktops), and it is using dnsmasq:

sudo bash -c "cat > /etc/NetworkManager/dnsmasq.d/docker-dns"
addn-hosts=/etc/docker-container-hosts
^D

sudo systemctl restart network-manager.service

• If you don't have a Network Manager, or it is not using dnsmasq:

sudo apt install -y dnsmasq
sudo bash -c "cat > /etc/dnsmasq.d/docker-dns"
addn-hosts=/etc/docker-container-hosts
^D

sudo systemctl restart dnsmasq.service

[Install 3/3] Register it as a system service

sudo bash -c "cat > /etc/systemd/system/docker-dnsmasq.service"
[Unit]
Description=Update dnsmasq with selected docker containers
After=docker.service dnsmasq.service network-manager.service

[Service]
ExecStart=/usr/local/bin/update-docker-dns.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target
^D

sudo systemctl enable docker-dnsmasq.service
sudo systemctl start docker-dnsmasq.service

Usage

See Install and test example. See Usage example.