Kubernetes lab with Kind and Tanka

Prerequisites

• with Nix: run nix develop to get a shell with required tools (or just direnv allow)
• without: install dependencies listed in flake.nix and set KUBECONFIG=.kubecfg

Bootstrap

jb install                                                        # Install jsonnet deps
tk tool charts vendor                                             # Vendor required helm charts
kind create cluster --config cluster.yaml --kubeconfig .kubecfg   # Create local cluster
tk apply environments/kind                                        # Create resources in cluster

A kind cluster with some core utilities should now be up and running!

Helm charts

Tanka can deal with Helm charts and apply them all the jsonnet goodness. This repo already uses some. Let's add cert-manager to the setup:

tk tool charts add-repo jetstack https://charts.jetstack.io
tk tool charts add jetstack/cert-manager@1.10.1             # version is mandatory, we want reproducibility
tk tool charts vendor                                       # to fetch defined charts on a fresh repo

Add a lib/cert-manager/main.libsonnet file to wrap the chart, set some values, and create a dedicated namespace:

local k = import 'github.com/grafana/jsonnet-libs/ksonnet-util/kausal.libsonnet';
local tanka = import 'github.com/grafana/jsonnet-libs/tanka-util/main.libsonnet';
local helm = tanka.helm.new(std.thisFile);

local ns = 'cert-manager';

{
  certmanagerNs: k.core.v1.namespace.new(ns),
  certmanager: helm.template('cert-manager', '../../charts/cert-manager', {
    namespace: ns,
    values: {
      prometheus: { enabled: false },
      installCRDs: true,
    },
  }),
}

And use it in an environment (see environments/kind/main.jsonnet):

(import 'cert-manager/main.libsonnet')

Run tk apply environments/kind to deploy.