Docker Network Connector

This bash script run in background, to connect/disconnect a container to all docker bridge networks.

Why

I host all my applications as docker containers and expose no port.

So I need a reverse proxy like traefik, nginx or caddy.

• For traefik: it has more than I need, but there are some reason: I don't want a GUI, I prefer nginx or caddy config file over yaml, but more than that, I don't want to mount my docker.sock to container.

• For nginx/caddy is good for me, if you didn't try Caddy, please give it a try:

  • Caddyfile is a godsend, I can create a reverse server in 1 line.
  • Auto SSL with Let's Encrypt or ZeroSSL.

But nginx/caddy is not born for Docker, you have to use one:

• Expose docker container port so we can proxy to something like localhost:8989
• Set container IP to static, we can proxy to 10.5.0.1:port
• Use this /etc/hosts update script with network_mode="host", which is pretty good but we need to restart proxy server container to update container's hosts file. So we can proxy to container_name:port.

With the inspiration of the last script, I wrote this. This script listen to docker events, and connect my caddy container to all networks.

Installation

Step 1:

Open and edit your container name in docker-network-connector (default is caddy)

readonly main_con_name=caddy

Step 2:

Copy docker-network-connector and service file to correct directory. Reload systemd and enable it.

Or simple:

make install

Uninstall

Disable service and remove it

Or:

make uninstall

Usage

You can restart, view status/log with those commands:

make restart
make status
make log