Setup Docker for CTF


I’m using Docker to solve the hackthebox machine. It’s so simple for me to use. Because Ubuntu has been my host machine for several years, and docker supports host networks in linux-based operating systems, but Windows does not. You can also connect the openvpn in docker. If you are using Windows, it will be difficult for you to use because it does not support host networks and you will have some difficulty using the VPN.

Why we need docker for CTF

Docker containers require fewer installations since they share many of their resources with the host system. A container often takes up less space and utilises less RAM and CPU time than a virtual machine. It boot up in a few seconds or less, whereas virtual machines can take several minutes.

Installing the docker for Ubuntu

Setup the repo

Update the apt package index and install packages to allow apt to use a repository over HTTPS:

sudo apt-get update
sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \

Add Docker’s official GPG key:

curl -fsSL | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Use the following command to set up the stable repository.

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Install Docker Engine

Update the apt package index, and install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli

To run Docker without root

Add your user to the docker group.

sudo usermod -aG docker $USER

Log out and log back in so that your group membership is re-evaluated.

Installation completed now you can run the docker.


Install the parrot docker image

docker pull parrotsec/security

now you can run the docker container

docker run -it --rm -v /etc/hosts:/etc/hosts -w /root/htb --network host -v $(pwd):/root/htb --cap-add=NET_ADMIN --device /dev/net/tun  --name htb parrotsec/security /bin/bash