my docker cheatsheet

docker_cheatsheet.md

basics

• check that docker is working: docker run hello-world
• prune images: docker image prune -a
• prune containers: docker container prune
• check nvidia-docker2 is working (with CUDA 10.0 in base): docker run --rm --gpus all nvidia/cuda:10.0-runtime nvidia-smi
• build with Dockerfile: docker build -t your_image_name .
• run built image as container: docker run --name your_container_name your_image_name (for extra options see here)
• kill running container: docker kill your_container_name

Mount a volume into the docker container

use the -v flag, You need to give the absolute local path or a volume name and map it to a directory within the container -v <source>:<target>. See this stackoverflow post or this article on freecodecamp for more details.

docker run -it --rm -v $(pwd)/dir/to/share:/container/path/to/shared/dir --name your_container_name your_container_id

Make Docker container start automatically on system boot

docker run --restart=always

Note that with this you cannot use the option --rm. Credit to this stackoverflow post and the official doc

watch a running container

once in interactive mode it's kind of hard to exit without killing the container. The best way to watch a container is actually by combining watch and docker logs. For example:

watch -n 0.1 "docker logs --tail 30 your_container_name_or_id"

Debug something in your Dockerfile

best to just run the base image interactively and try the command in bash:

docker run -it --rm {image:tag} /bin/bash

or to override an image's entry point:

docker run -it --rm --entrypoint /bin/bash {image:tag|image_id}