Installing Docker on Kali Linux (updated for 2021.1)

February 2021 update:

  • These instructions have been tested and are working on Kali Linux 2021.01
  • At the same time, Docker version that is available through Kali repositories is now quite fresh, so the easiest way to install Docker, unless you absolutely need the latest version, is:
    sudo apt-get update && sudo apt-get install -y docker.io
    at the time of writing, you actually get the same version (20.10.3) using both methods, which might diverge in the future.
  • Instructions below also make use of the new way of adding package signing keys to the system as apt-key is being deprecated (note, Docker documentation hasn’t been appropriately updated yet). More details here: https://github.com/docker/docker.github.io/issues/11625

This is a quick guide on how to install Docker Engine on Kali Linux using official Docker repositories, see the note above about OS-provided packages. These steps have been tested on Kali 2021.1.

This guide is based on official Docker documentation (https://docs.docker.com/engine/installation/linux/docker-ce/debian/), with slight modification as adding a repository doesn’t work (we’re adding Debian repository to Kali distro).

Raspberry Pi instructions have been tested to work on both 32-bit and 64-bit Kali Linux.

Since Kali Linux 2020.1, a non-root user is created by default, details here — https://www.kali.org/news/kali-default-non-root-user/.

Why?

docker run -it ztgrace/changeme /bin/bash

was easy and didn’t pollute the rest of the system with python dependencies etc. Also, there is an older version of the tool included in Kali package repositories, with Docker you can try new versions of existing tools without any library version conflicts etc.

I’m no Docker expert by any means, so if you’ve used Docker on Kali, feel free to share what you liked about it.

Preparation

Add Docker PGP key (saved to /usr/share/keyrings/):

curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor | sudo tee /usr/share/keyrings/docker-archive-keyring.gpg >/dev/null

Configure Docker APT repository (Kali is based on Debian testing, which will be called buster upon release, and Docker now has support for it):

echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian buster stable' | sudo tee /etc/apt/sources.list.d/docker.list

For Raspberry Pi 32-bit — use the following command instead:

echo 'deb [arch=armhf signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian buster stable' | sudo tee /etc/apt/sources.list.d/docker.list

For Raspberry Pi 64-bit — use the following command instead:

echo 'deb [arch=arm64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian buster stable' | sudo tee /etc/apt/sources.list.d/docker.list

Update APT:

sudo apt-get update

Install Docker

sudo apt-get remove -y docker docker-engine docker.io

Install Docker:

sudo apt-get install -y docker-ce

For Raspberry Pi, use the following command instead:

sudo apt-get install -y --no-install-recommends docker-ce

(aufs-dkms package errors out when trying to install on Raspberry Pi, by using --no-install-recommends switch we avoid the issue by not installing aufs-dkms, and Docker still works fine.)

Test:

sudo docker run hello-world

To allow your non-root user to use Docker, add the user to docker group:

sudo usermod -aG docker $USER

Log out and log back in for this change to apply. Note a warning from Docker documentation: the docker group grants privileges equivalent to the root user. For details on how this impacts security in your system, see Docker Daemon Attack Surface.

References

Random rumblings about #InfoSec. The opinions expressed here are my own and not necessarily those of my employer.

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