Here are the basic commands to get you started with Docker, explained simply.

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1. Install and Run MongoDB with Docker

docker run -d -p 27017:27017 --name mongo mongo

• -d: runs the container in the background (detached)
• -p 27017:27017: maps port 27017 of the container to your computer
• --name mongo: gives the container a name
• mongo: uses the official MongoDB image (latest version)

Or if you want a specific version:

docker run -d -p 27017:27017 --name dbNoSQL mongo:4

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2. Basic Docker Commands

• Run the test container:

docker run hello-world

• See running containers only:

docker ps

• See all containers (running and stopped):

docker ps -a

• Get detailed info about a container (use container ID or name):

docker inspect <ID_or_name>

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3. Manage Containers

• Create a container with a custom name:

docker run --name hello-vass hello-world

• Rename a container:

docker rename hello-vass hola-pablo

• Delete a container:

docker rm <ID_or_name>

• Delete all stopped containers (cleanup):

docker container prune

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4. Work with Ubuntu Container

• Run Ubuntu but don’t open its console:

docker run ubuntu

• List all containers to check their status:

docker ps -a

• Run Ubuntu and enter its interactive shell:

docker run -it ubuntu

What do -i and -t mean?

• -i: interactive mode (lets you type commands)
• -t: opens a terminal session

Once inside, you can try commands like:

cat /etc/lsb-release

(to see the Linux version inside the container)

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5. Keep a Container Running Without Doing Anything

To keep an Ubuntu container running all the time:

docker run --name alwaysup -d ubuntu tail -f /dev/null

• tail -f /dev/null: keeps the container running idle

To enter this always-running container:

docker exec -it alwaysup bash

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6. Inspect Container Processes

To find the main process ID (PID) inside a container:

docker inspect --format '{{.State.Pid}}' alwaysup

Note: On Linux, you can kill this process with kill -9, but this might not work on Mac.

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7. Run ActiveMQ with Docker

docker run -p 61616:61616 -p 8161:8161 -d --name amq rmohr/activemq

This runs an ActiveMQ server and exposes the required ports.

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Final Tips

• Always use custom names for your containers to manage them easier.
• Clean up stopped containers with docker container prune to save disk space.
• To enter any container’s shell and work inside: docker exec -it <name> bash.

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Want me to make a cheat sheet or examples for a specific project? Just ask!

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How’s this?