My day job is Technical Team Lead at Safespring. I’m also a co-organiser of Devopsdays Oslo and Devopsdays Stockholm. Sometimes I go to other conferences.

I live in Norway.

How to manage dotfiles in a bare git-repo

How to set up:

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

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git init --bare $HOME/.cfg

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

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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:

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config config --local status.showUntrackedFiles no

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

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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:

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config add .zshrc
config add .vimrc
config commit

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

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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

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

Define the config-alias

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

And last: Check out the repo

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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:

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

then we need to create a ipv6 network for docker:

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

restart docker

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systemctl restart docker

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

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

and choose the ipv6 network:

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networks:
  default:
    external:
      name: ipv6

rebuild the docker container:

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$ 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.