How to manage dotfiles in a bare git-repo

How to set up:

Initialize an empty git repo in a folder in $HOME:

1

git init --bare $HOME/.cfg

Now we want to set up an alias for git to work on this repo:

1

alias config='/usr/bin/git --git-dir=$HOME/.cfg/ --work-tree=$HOME' 

We want to hide untraced files, so we explicitly choose which files to track:

1

config config --local status.showUntrackedFiles no

Make config persistent, I use zsh, so I add the alias to .zshrc

1

echo "alias config='/usr/bin/git --git-dir=$HOME/.cfg/ --work-tree=$HOME'" >> $HOME/.zshrc

now its time to add a few existing config files to the repo:

1
2
3

config add .zshrc
config add .vimrc
config commit

I created a github repo and pushed my config to github:

1
2

config remote add origin <github-repo-url>
config push

Now, time to check out my config on another machine. First, checkout the repo using the --bare option

1

git clone --bare <git-repo-url> $HOME/.cfg

Define the config-alias

1

alias config='/usr/bin/git --git-dir=$HOME/.cfg/ --work-tree=$HOME'

And last: Check out the repo

1

config checkout

Getting ipv6 to work with rpi, docker and pihole

This is how I made pihole run in a docker container with ipv6 support.

Step one: Configure docker for ipv›6:

1
2
3
4
5

$ cat /etc/docker/daemon.json
{
        "ipv6": true,
        "fixed-cidr-v6": <your-ipvc-cidr>
}

then we need to create a ipv6 network for docker:

1

docker network create --ipv6 --driver bridge --subnet "fd01::/64" ipv6

restart docker

1

systemctl restart docker

I use docker-compose to manage the container, so I added the following to docker-compose.yml

1
2

      ServerIPv6: <this is the ip of your rpi host>
      IPv6: "true"

and choose the ipv6 network:

1
2
3
4

networks:
  default:
    external:
      name: ipv6

rebuild the docker container:

1

$ docker-compose up -d --no-deps --build pihole

And voila! The pihole instance should now come up with an valid ipv6 address - and should respond to DNS queries on the ipv6 interface.

CS3 conference 2020

I recently attended the CS3 conference in Copenhagen. I did a talk about our experiences from running ceph in production for almost 3 years, and here is a link to the slides from my talk