Why multiple Pi-holes and keeping them in sync

For redundancy, I run two Pi-hole instances on two different hardware devices.

Out of the box, making a change on one Pi-hole means logging into the other Pi-hole and making the same change, so the Pi-Hole instances return the same results.

Not an ideal situation, in case …

Pi-hole admin page redirect failure

I run two Pi-hole instances for redundancy, on two different hardware devices.

I ran into a small, but annoying, issue when trying to access the web admin page.

When accessing the admin web page, Pi-hole should redirect / to /admin, but it wasn't on just one of my Pi-hole instances. …

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 was on my mobile, looking up a few recipes, I was amazed at the number of intrusive ads I was getting, which made reading the web pages almost impossible.

Decided it was time to investigate Pi-hole, as I'd heard good things about it.

The Pi-hole is a DNS sinkhole that protects your devices from unwanted content, …