Containers on ayyzenn

Puppet with Docker: How I Tested Master and Agent

Thu, 28 Jul 2022 00:00:00 +0000

What I Did

I wanted to try Puppet without dedicating two full VMs. I ran a Puppet master and agent in separate Ubuntu Docker containers on my machine. Docker host commands work the same on Ubuntu and Arch.

Installing Puppet Master

Download the Ubuntu image:
```
sudo docker pull ubuntu
```

Create a container for Puppet master:

sudo docker run --name puppet-master -it ubuntu
exit

Start the container:
```
sudo docker start puppet-master
```
Open the bash shell of the Puppet master container:

Creating My First Docker Container

Wed, 27 Jul 2022 00:00:00 +0000

What I Did Here

After installing Docker, I wanted to run an actual Ubuntu container — not just hello-world. The steps inside this post are the same on Arch Linux and Ubuntu hosts. Only the Docker installation differs — see Docker on Arch Linux and Ubuntu for that part.

Arch Linux (host)

Make sure Docker is installed and running on your Arch machine first:

sudo pacman -S docker
sudo systemctl enable --now docker
systemctl status docker

Pull the Ubuntu image

sudo docker pull ubuntu

Create and enter a container

sudo docker run --name my-container -it ubuntu

What those flags mean:

Docker on Arch Linux and Ubuntu: How I Got It Running

Tue, 26 Jul 2022 00:00:00 +0000

Why I Started Using Docker

I wanted a way to run apps without messing up my main system. Docker packs an app with everything it needs into a container — a small, isolated environment that shares my kernel but stays separate from everything else.

If something breaks inside a container, I delete it and start over. No reinstalling the whole OS.

Containers vs Images (Quick Version)

Image — a read-only template (like a recipe)
Container — a running instance of that image (like the actual dish you cooked)

You build or pull an image once. You can spin up as many containers from it as you want.