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Get an old computer or raspberry pi and install pihole with portainer:

https://homenetworkguy.com/how-to/install-pihole-on-raspberry-pi-with-docker-and-portainer/

Install on Ubuntu

Prerequisites

To get started with Docker Engine on Ubuntu, make sure you have one of following OS

  • Ubuntu Focal 20.04 (LTS)
  • Ubuntu Bionic 18.04 (LTS)
  • Ubuntu Xenial 16.04 (LTS)

Uninstall older version of docker

sudo apt-get remove docker docker-engine docker.io containerd runc

It’s OK if apt-get reports that none of these packages are installed.

SET UP THE REPOSITORY

  1. 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 
apt-transport-https 
ca-certificates 
curl 
gnupg-agent 
software-properties-common
  1. Add Docker’s official GPG key:

    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
  2. Setup the stable repository

sudo add-apt-repository 
"deb [arch=amd64] https://download.docker.com/linux/ubuntu 
$(lsb_release -cs) 
stable"

Install Docker

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

Verity that Docker Engine is installed correctly

    sudo docker run hello-world

    or

    sudo systemctl status docker

If you want to unninstall Docker, use the following commands

sudo apt-get purge docker-ce docker-ce-cli containerd.io
sudo rm -rf /var/lib/docker

If trying to run pihole in docker on ubuntu server and getting the following error:

“Failuredriver failed programming external connectivity on endpoint Pihole (c9b821f72080bbc4cf5a736b170e50cfcccbf7c3e312384356edcec8e740d63b): Error starting userland proxy: listen tcp 0.0.0.0:53: bind: address already in use” it means that the port 53 is already in use

To remove this error type this command in the ubuntu terminal:

sudo systemctl disable systemd-resolved.service

sudo systemctl stop systemd-resolved.service

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