Setup local Kubernetes cluster with ingress-nginx

setup.sh

#!/bin/bash -e

# Dependencies:
# - k3d (github.com/rancher/k3d)
# - kubectl (github.com/kubernetes/kubectl)
# - jq (github.com/stedolan/jq)

setup_cluster() {  
  k3d cluster create dev \
    --agents 1 \
    --k3s-arg "--disable=traefik@server:0" \
    --k3s-arg "--disable=servicelb@server:0" \
    --no-lb \
    --wait
}

install_metallb() {
  kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.10.3/manifests/namespace.yaml
  kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.10.3/manifests/metallb.yaml
}

configure_metallb() {
  lb_cidr="$(
    docker network inspect k3d-dev \
      | jq -r '.[0].IPAM.Config[0].Subnet' \
      | awk '{split($0,i,"."); print sprintf("%d.%d.%d.%s", i[1],i[2],i[3], "240/29")}'
   )"
   cat <<EOF | kubectl apply -f
apiVersion: v1
kind: ConfigMap
metadata:
  name: config
  namespace: metallb-system
data:
  config: |
    address-pools:
      - name: default
        protocol: layer2
        addresses:
          - $lb_cidr
EOF
}

install_ingress_nginx() {
  kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.4/deploy/static/provider/baremetal/deploy.yaml
  kubectl patch svc ingress-nginx-controller -n ingress-nginx -p '{"spec": {"type": "LoadBalancer"}}'
}

main() {
  setup_cluster
  install_metallb
  configure_metallb
  install_ingress_nginx
}

main