kubernetes/setup

Cluster Setup

• Fedora 35
• Fedora Kubernetes packages 1.22

Machine Setup

Add to pyrocufflink.blue domain:

ansible-playbook \
    -l k8s-amd64-ctrl0.pyrocufflink.blue \
    remount.yml \
    bootstrap.yml \
    pyrocufflink.yml \
    -e ansible_host=172.30.0.167/28 \
    -u root \
    -e @join.creds

Set up Kubernetes agent (kubelet):

ansible-playbook -l k8s-amd64-ctrl0.pyrocufflink.blue kubelet.yml -b

Initialize cluster

Run on k8s-ctrl0.pyrocufflink.blue:

kubeadm init \
    --control-plane-endpoint kubernetes.pyrocufflink.blue \
    --upload-certs \
    --kubernetes-version=$(rpm -q --qf '%{V}' kubernetes-node) \
    --pod-network-cidr=10.149.0.0/16

Configure Pod Networking

Calico seems to be the best choice, based on its feature completeness, and a couple of performance benchmarks put it basically at the top.

curl -fL\
    -O 'https://projectcalico.docs.tigera.io/manifests/tigera-operator.yaml' \
    -O 'https://projectcalico.docs.tigera.io/manifests/custom-resources.yaml'
sed -i 's/192\.168\.0\.0\/16/10.149.0.0\/16/' custom-resources.yaml
kubectl create -f tigera-operator.yaml
kubectl create -f custom-resources.yaml

Wait for Calico to deploy completely, then restart CoreDNS:

kubectl wait -n calico-system --for=condition=ready \
    $(kubectl get pods -n calico-system -l k8s-app=calico-node -o name)
kubectl -n kube-system rollout restart deployment coredns
unset calico_node

Add Worker Nodes

kubeadm join kubernetes.pyrocufflink.blue:6443 \
    --token xxxxxx.xxxxxxxxxxxxxxxx \
    --discovery-token-ca-cert-hash sha256:…

Add Control Plane Nodes

kubeadm join kubernetes.pyrocufflink.blue:6443 \
    --token xxxxxx.xxxxxxxxxxxxxxxxx \
    --discovery-token-ca-cert-hash sha256:… \
    --control-plane \
    --certificate-key …

Create Admin user

cat < kubeadm-user.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
clusterName: kubernetes
controlPlaneEndpoint: kubernetes.pyrocufflink.blue:6443
certificatesDir: /etc/kubernetes/pki
EOF
kubeadm kubeconfig user \
    --client-name dustin \
    --config kubeadm-user.yaml \
    --org system:masters \
    > dustin.kubeconfig