Installing Docker on Ubuntu 20.04

Update September 2025:

There is now a script provided by Docker.com to simplify the installation of Docker.

As with any script you download from the Internet, make sure you are aware of what the scipt does before running the script!

curl -fsSL https://get.docker.com -o get-docker.sh …

These instructions/screenshots were from an UDM Pro running:

UniFi OS UDM Pro 1.11.0 UniFi Network Application 7.0.23

Why

From the FBI field office in Portland:

Your fridge and your laptop should not be on the same network.¹

If those cheap "smart" lightbulbs you bought off Amazon get compromised because of …

I have a Pi-hole Docker container running on my NAS, but DNS functionality is too important to have a single point of failure.

If something were to happen to my NAS, my home network would have no DNS resolution, which brings the network to it's knees.

I had been using a Raspberry Pi as my second DNS server, running …

Upgrading Pi-hole is easy:

pihole -up

However, this doesn't work if you're running a Docker container.

docker exec -it pihole pihole -up
Function not supported in Docker images

To get Pi-hole Docker container upgraded, you have to force Docker to pull the latest Pi-hole version and redeploy the container.

docker pull …

I've been using Wireguard for a few months now, and the performance has been great, with zero stability issues.

I started by using a virtual machine for the Wireguard server, and once I got the configuration ironed out, then moved it to a Docker instance.

I later discovered that my Ubiquiti Ultimate Dream Machine Pro …

Let's Encrypt will issue you free SSL certificates, but you have to verify you control the domain, before they issue the certificates.

The 2 major ways of proving control over the domain:

1. Create a specific page on your webserver that they can reach.
2. Create a temporary DNS TXT record.

I went with option #2, as my web …