Devcontainer

Docker container for development

How to use it

Connect with ssh and use it like a remote server.

Run

docker-compose up -d

Stop

docker-compose down

Setting

You can configure it by editing docker-compose.yml.

Components

OpenSSH-Server

To enable it, set the build argument to use_openssh_server=true.

You can change the ssh port by editing docker-compose.yml.

When you run the container, configuration files are created in data/ssh:

• data/ssh/.ssh/authorized_keys: You can set the public key.
• data/ssh/config/sshd_config: You can modify the config of the ssh server.

After modifying the configuration file, container restart is required.

Docker

To enable it, set the build argument to use_docker=true.

To run docker commands without root privileges, set the environment variable to DOCKER_ALLOWS_NON_ROOT=true.

There are two ways to use Docker inside a container.

Docker-out-of-Docker

Share the host's docker daemon into a container.

Add this in docker-compose.yml:

services:
  devcontainer:
    volumes:
      - /var/run:/mnt/host/var/run

If you are using WSL and Docker Desktop for Windows, set the environment to DOCKER_GID=1001.

Docker-in-Docker

The container uses a host-independent Docker daemon.

Don't mount /var/run to container.

Docker daemon will not run due to iptables permission issue. To resolve it, add this in docker-compose.yml:

services:
  devcontainer:
    cap_add:
      - NET_ADMIN