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docker

At the core of the Docker architecture lies a client-server model, where we have two primary components:

  • The Docker daemon
  • The Docker client

The Docker client acts as our interface for issuing commands and interacting with the Docker ecosystem, while the Docker Daemon, also known as the Docker server, is responsible for executing those commands and managing containers.

Think of a Docker image as a blueprint or a template for creating containers. A Docker container is an instance of a Docker image. It is a lightweight, isolated, and executable environment that runs applications. While images are immutable and read-only, containers are mutable and can be modified during runtime. However, any modifications made to a container's filesystem are not persisted unless explicitly saved as a new image or stored in a persistent volume.

See Pentesting docker.

Installation

To make sure that I have docker engine, docker compose and nginx installed.

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sudo apt install docker docker-compose nginx

Depending on the image you are going to compose you will need nginx or other dependencies.

Another way, see https://www.kali.org/docs/containers/installing-docker-on-kali/

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sudo apt update
sudo apt install -y docker.io
sudo systemctl enable docker --now
docker
sudo usermod -aG docker $USER

Basic commands

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# show all processes 
docker ps -a

# Actions on dockerInstance/PID/part of id if unique: restart, stop, start, status
sudo docker <restart/stop/start/status> <nameOfDockerInstance/PID/partOfIDifUnique>

# Create the first docker instance: Hello, world! It gets the setting from docker.hub
sudo docker run hello-world
# run: build and deploy an instance
# by default, docker saves everything in /var/lib/docker

# Execute commands in an already running docker instance. You can execute a terminal or a command. 
sudo docker run -it <image> <echo lala / bf bash>
# image: for instance, debian
# <echo lala or bf bash>: command echo lala. Or terminal in bash
Last update: 2025-02-16
Created: March 28, 2023 11:57:03