steshaw

{
  description = "Application packaged using poetry2nix";

  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  inputs.poetry2nix = {
    url = "github:nix-community/poetry2nix";
    inputs.nixpkgs.follows = "nixpkgs";
  };

steshaw

import zipfile
import io

zip_buffer = io.BytesIO()
with zipfile.ZipFile(zip_buffer, mode='w', compression=zipfile.ZIP_DEFLATED) as zipf:
    zipf.writestr("file1.txt", "one")
    zipf.writestr("file2.txt", "two")
    zipf.writestr("file3.txt", "three")
zip_buffer.seek(0)

steshaw

export KUBECONFIG=~/.kube/config
mkdir ~/.kube 2> /dev/null
sudo k3s kubectl config view --raw > "$KUBECONFIG"
chmod 600 "$KUBECONFIG"

See https://devops.stackexchange.com/a/16044/3798

steshaw

Docker in Docker on ZFS

Docker in Docker (dind) and overlay2 doesn't currently work on ZFS, so we need to create an ext4 filesystem volume and have Docker use that. This is helpful to anything that requires overlay2 and/or dind such as minikube (with Docker driver), or K3s.

sudo zfs create -s -V 100G rpool/docker
sudo mkfs.ext4 /dev/rpool/docker

steshaw

$ curl -sfL https://get.k3s.io | sh -
[INFO]  Finding release for channel stable
[INFO]  Using v1.25.7+k3s1 as release
[INFO]  Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.25.7+k3s1/sha256sum-amd64.txt
[INFO]  Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.25.7+k3s1/k3s
[INFO]  Verifying binary download
[INFO]  Installing k3s to /usr/local/bin/k3s
[INFO]  Skipping installation of SELinux RPM
[INFO]  Creating /usr/local/bin/kubectl symlink to k3s

steshaw

Setting up a fresh Ubuntu machine

Start with Ubuntu

Install Ubuntu Desktop 22.04, encrypted ZFS, with minimal packages.

Install OpenSSH

We may want to do the rest of the installation/configuration from our laptop over ssh, so:

steshaw

First run

Very first run on freshly installed machine.

Total elapsed time: 18m22s

• chainsail-celery-worker 194.0s
• chainsail-scheduler 63.6s
• chainsail-nginx 31.8s
• chainsail-user-code 237.0s

steshaw

Various configuration/data-templating languages:

• Jsonnet: https://jsonnet.org/
• UCL: https://github.com/vstakhov/libucl
• Nix: https://nixos.wiki/wiki/Nix_Expression_Language
• Coil: https://code.google.com/archive/p/coil/
• Pystachio: https://github.com/wickman/pystachio
• Cue: https://github.com/cuelang/cue
• GCL: Paper http://alexandria.tue.nl/extra1/afstversl/wsk-i/bokharouss2008.pdf
• UCG (a descendant of GCL) https://github.com/zaphar/ucg

steshaw

#!/usr/bin/env bash

set -euo pipefail

base_image='registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb10'
tag='9e4c540d9e4972a36291dfdf81f079f37d748890'
image="${base_image}:${tag}"

docker run -it --rm \
    --volume /nix:/nix \

steshaw

{-# language DataKinds #-}
{-# language DuplicateRecordFields #-}
{-# language OverloadedRecordDot #-}

import GHC.Records

data Person = Person
  { name :: String
  , pet :: Pet
  , partner :: Maybe Person