Docker

Docker : Operating system-level virtualization (not VM). It packages the environment so code, libraries, and dependencies can run on all platforms.

Docker Hub: GitHub, but for Docker images.

Docker container : A running instance of a Docker image.

Docker image : Packages libraries, files, project code, and environment built from a Dockerfile.

Dockerfile : Setup file for building an image.

// Quick Parameter Replacer (Updates "What I use" below in real-time)
Container Name: Image: Host Port: Container Port:

Docker commands I know and use

Dockerfile
    FROM [base-image]
    WORKDIR [directory-path]                  << main working directory in container
    COPY [host-path] [container-path]         << copy file/folder into container
    RUN [command]                             << example: RUN npm install
    CMD ["sh", "-c", "command1 && command2"]  << example: CMD ["node", "server.js"]
    EXPOSE [port]                             << port container listens on (in container)

docker [options / subcommands]
    ps                                        << show running containers
    ps -a                                     << show all containers (stopped or running)
    images                                    << show all images on machine
    pull [image]                              << pull image from Docker Hub
    build -t [image_name] [path]              << build and tag/name an image
    run --name [container-name] [image]       << create and start a new container
    start [id/name]                           << start stopped container
    exec -it [container-id] /bin/bash         << connect / open shell in container
    rm [name/id]                              << remove container
    rmi [name/id]                             << remove image

What I use
    docker run -d -it --name [container-name] -p [host-port:container-port] [image]
    docker exec -it [container] /bin/bash     << or /bin/sh

.mymoonnote