Docker Cheatsheet / Notes
Docker Commands
docker ps shows list of currently running containers
docker ps -a shows list of currently running and previously ran containers
docker run <image> starts container in attached mode
docker run -d <image> starts container in detached mode, system prompt returns
docker run -it <image> starts container in interactive mode, connects container shell
docker exec <con_id> <command> executes command in a running container
docker run <image> <command> runs the command in the container
docker stop <con_id> stops container with given id
docker stop <name> stops container with given name
docker rm <con_id> removes container with given id, multiple separated by space
docker rm <name> removes container with given name, multiple separated by space
docker rmi <img_id> removes image with given id, multiple separated by space
docker rmi <image> removes image with given name, multiple separated by space
docker pull <image> downloads image from Docker Hub to local storage
docker run <img>:<tag> downloads image with specified tag
Docker Run in Details
Interactive mode
docker run -it interactive mode with psuedo terminal
port mapping
docker run -p <host_port>:<con_port> maps host port to container port
volume mapping, data persistence
docker run -v <host_vol>:<con_vol> maps host storage to container storage
e.g. docker run -it /home/neeraj/Sources:/home/ alpine:3.17
Supplementary
docker logs <con_id> view the logs
docker attach <con_id> attaches to given running container
docker inspect <con_id> displays information about running container, e.g. ip address
Docker Images and Containerization
How to create the image?
start with the OS
FROM python:3.11.0-alpine
Docker Environment Variables
docker run -e APP_VARIANT=12
Docker Compose
Running multi-container app