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Containerization

Introduction to Docker​

Docker is a containerization platform that packages applications and their dependencies into isolated environments called containers. In cybersecurity, Docker is used to create secure, reproducible environments for testing, analyzing, and deploying applications without compromising the host system.

Docker containers are especially useful for pentesting a website before production. They allow penetration testers to accurately replicate production environments in isolated settings, enabling thorough vulnerability assessments without risking the stability or security of live systems. This approach also facilitates rapid setup, testing, and teardown of environments, making it easier to identify and fix security issues early in the development cycle.

Installation​

For installation instructions and the latest updates on Docker, visit the official Docker documentation at https://docs.docker.com/get-docker/. Since installing Docker can be complex and often changes, always refer to the official guide for the most accurate and up-to-date information.

Running a Docker Image​

To run a Docker image, use the following command:

docker run -d -p 8080:80 <image_name>

This command starts the container in detached mode (-d) and maps the container's port 80 to port 8080 on the host.

Extracting a Docker Image from a Tar File​

If you have a Docker image saved as a tar file, load it with:

docker load -i image_file.tar

This command imports the image into your local Docker repository.

Running the Extracted Docker Container​

After loading the image, run the container with:

docker run -d -p 8080:80 <image_name>

Replace <image_name> with the actual name of the Docker image.

Accessing the Container's Port​

By mapping the container's port to a host port (e.g., -p 8080:80), you can access the running service via http://localhost:8080 or the host's IP address on port 8080.

Viewing and Managing Docker Containers​

Viewing Docker Images​

To view all available Docker images on your system, use:

docker images

Viewing Running Containers​

To list all running Docker containers, use:

docker ps

Deleting a Docker Container​

To delete (remove) a stopped container, use:

docker rm <container_id>

Replace <container_id> with the actual container ID or name. Ensure the container is stopped before attempting deletion.

Pausing a Docker Container​

To pause a running container, use:

docker pause <container_id>

Replace <container_id> with the actual container ID or name. To resume the container, use:

docker unpause <container_id>

Conclusion​

Docker containers provide a powerful and secure way to isolate applications, making them essential in cybersecurity for testing, vulnerability analysis, and deployment.