Docker

Docker commands

• docker system prune - Remove unused data. Useful when docker eats all available disk space on our computer. Pass the --all argument to delete all unused images, not just dangling images.

  bash docker system prune --all

Container init programs

• runit - A UNIX init scheme with service supervision. (Source Code) C
• tini - A tiny but valid init for containers. Used by conda-forge. Probably the best choice. C
• s6 - The s6 supervision suite. (Source Code) C
• supervisor - Does not pick up zombie processes. Python

Docker machine

• In order to log in to one of the worker machines, use ssh certificates from the /root/.docker/machine/machines folder.

Troubleshooting

Docker does not correctly detect the MTU (maximum transfer unit) of the container. It must be specified manually in the /lib/systemd/system/docker.service file:

ExecStart=/usr/bin/docker daemon -H fd:// –mtu=1400

Additional resources

• Automated Nginx Reverse Proxy for Docker
• nginx-proxy
  • Automated nginx proxy for Docker containers using docker-gen
  • Docker image: https://hub.docker.com/r/jwilder/nginx-proxy/
• docker-gen
  • Generate files from docker container meta-data