[Docker] Docker Compose

 Step 0: Download the Container

docker pull testcontainers/sshd:1.3.0

Step 1: Save the File

Copy the code below and save it as a file named docker-compose.yml in a folder on your computer.

YAML

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services:

  sshd:

    image: testcontainers/sshd:1.3.0

    environment:

      - PASSWORD=your_secure_password

    ports:

      - "10022:22"

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Step 2: Run the Command

Open your terminal or command prompt, navigate to the folder where you saved the file, and run:

Bash

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docker compose up -d

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up: Tells Docker to create and start the containers defined in the file.

-d: Runs the container in "detached" mode (in the background) so it doesn't lock up your terminal window.

Step 3: Verify it's Running

You can check if the SSH server is active by running:

Bash

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docker compose ps

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This should show the sshd service running and mapped to port 10022.

How to actually "use" this specific container

Since this is an SSH server (testcontainers/sshd), its main purpose is to let you log in or create tunnels.

To log in to the container's shell:

Bash

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ssh root@localhost -p 10022

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(When prompted for a password, use your_secure_password as defined in the YAML file.)

To create a reverse tunnel (the "Testcontainers" way): If you have a service running on your actual computer at port 8080 and you want this Docker container to see it, run this from your computer:

Bash

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ssh -R 8080:localhost:8080 root@localhost -p 10022

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Now, if you were to enter the container (using the login command above), you could run curl http://localhost:8080 and it would reach the app on your physical machine.

How to Stop It

When you are finished, go back to the terminal in that folder and run:

Bash

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docker compose down

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This will stop the container and clean up the internal network it created.