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09-bootstrapping-kubernetes-workers.md

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Bootstrapping the Kubernetes Worker Nodes

In this lab you will bootstrap three Kubernetes worker nodes. The following components will be installed on each node: runc, container networking plugins, cri-containerd, kubelet, and kube-proxy.

Download Worker Binaries

wget -q --show-progress --https-only --timestamping \
  https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz \
  https://storage.googleapis.com/kubernetes-release/release/v1.18.1/bin/linux/amd64/kubectl \
  https://storage.googleapis.com/kubernetes-release/release/v1.18.1/bin/linux/amd64/kube-proxy \
  https://storage.googleapis.com/kubernetes-release/release/v1.18.1/bin/linux/amd64/kubelet

Prerequisites

The commands in this lab must be run on each worker instance: worker-0, worker-1, and worker-2. Login to each worker instance using the vagrant ssh command. Example:

vagrant ssh worker-0

Provisioning a Kubernetes Worker Node

Install the OS dependencies and containerd package:

sudo apt update && sudo apt -y install socat containerd

The socat binary enables support for the kubectl port-forward command.

Install Worker Binaries

Create the installation directories:

sudo mkdir -p \
  /etc/cni/net.d \
  /opt/cni/bin \
  /var/lib/kubelet \
  /var/lib/kube-proxy \
  /var/lib/kubernetes \
  /var/run/kubernetes

Install the worker binaries:

sudo tar -xvf /vagrant/cni-plugins-amd64-v0.7.1.tgz -C /opt/cni/bin/

(cd /vagrant && sudo cp kubectl kube-proxy kubelet /usr/local/bin/)

(cd /usr/local/bin && sudo chmod +x kubectl kube-proxy kubelet)

Get Worker Internal IP

INTERNAL_IP=$(ip -4 --oneline addr | grep -v secondary | grep -oP '(192\.168\.100\.[0-9]{1,3})(?=/)')

Configure the Kubelet

(cd /vagrant && sudo cp ${HOSTNAME}-key.pem ${HOSTNAME}.pem /var/lib/kubelet/)

(cd /vagrant && sudo cp ${HOSTNAME}.kubeconfig /var/lib/kubelet/kubeconfig)

(cd /vagrant && sudo cp ca.pem /var/lib/kubernetes/)

Create the kubelet.service systemd unit file:

cat > kubelet.service <<EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
ExecStart=/usr/local/bin/kubelet \\
  --anonymous-auth=false \\
  --authorization-mode=Webhook \\
  --client-ca-file=/var/lib/kubernetes/ca.pem \\
  --cluster-dns=10.32.0.10 \\
  --cluster-domain=cluster.local \\
  --container-runtime=remote \\
  --container-runtime-endpoint=unix:///var/run/containerd/containerd.sock \\
  --image-pull-progress-deadline=2m \\
  --kubeconfig=/var/lib/kubelet/kubeconfig \\
  --network-plugin=cni \\
  --register-node=true \\
  --runtime-request-timeout=25m \\
  --tls-cert-file=/var/lib/kubelet/${HOSTNAME}.pem \\
  --tls-private-key-file=/var/lib/kubelet/${HOSTNAME}-key.pem \\
  --v=2 \\
  --node-ip=${INTERNAL_IP}
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

Configure the Kubernetes Proxy

(cd /vagrant && sudo cp kube-proxy.kubeconfig /var/lib/kube-proxy/kubeconfig)

Create the kube-proxy.service systemd unit file:

cat > kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/usr/local/bin/kube-proxy \\
  --cluster-cidr=10.244.0.0/16 \\
  --kubeconfig=/var/lib/kube-proxy/kubeconfig \\
  --proxy-mode=iptables \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

Start the Worker Services

sudo mv kubelet.service kube-proxy.service /etc/systemd/system/

sudo systemctl daemon-reload

sudo systemctl enable containerd kubelet kube-proxy

sudo systemctl start containerd kubelet kube-proxy

Remember to run the above commands on each worker node: worker-0, worker-1, and worker-2.

Verification

Login to one of the controller nodes:

vagrant ssh controller-0

List the registered Kubernetes nodes:

kubectl get nodes

output

NAME       STATUS     ROLES     AGE       VERSION
worker-0   NotReady   <none>    1m        v1.8.0
worker-1   NotReady   <none>    1m        v1.8.0
worker-2   NotReady   <none>    1m        v1.8.0

Next: Configuring kubectl for Remote Access