Docker

CoreOS Docker Quirks

Command-Line Completion: Unsupported

Bash completion is not available for CoreOS, making it difficult or impossible to install docker command completion, as described here: https://docs.docker.com/compose/completion/

Installing Docker Compose

Since the /usr/local/bin/ folder is read-only, and sudo -i did not seem to help, I was able to install docker-compose by using curl to place the executable in my home folder (or any writable folder). Then, executing `export PATH=$PATH:/path/to/docker/compose`

Debugging

Building a Container

• docker stats <name or id> - shows memory usage / limits
• docker run <id> - can use the id of incremental build images to boot into the failing state

Running a Container

• docker events <id> - shows what docker daemon is doing in the background
• docker inspect <name or id> - inspect a particular container's configuration
• docker logs <id> - shows the logs of a particular container
• nsenter - enter a particular namespace

Inspecting a Running Container

• docker exec -it <name or id> /bin/bash