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17-extra-dynamic-kubelet-configuration.md

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Dynamic Kubelet Configuration

sudo apt install -y jq

NODE_NAME="worker-1"; curl -sSL "https://localhost:6443/api/v1/nodes/${NODE_NAME}/proxy/configz" -k --cert admin.crt --key admin.key | jq '.kubeletconfig|.kind="KubeletConfiguration"|.apiVersion="kubelet.config.k8s.io/v1beta1"' > kubelet_configz_${NODE_NAME}

kubectl -n kube-system create configmap nodes-config --from-file=kubelet=kubelet_configz_${NODE_NAME} --append-hash -o yaml

Edit worker-1 node to use the dynamically created configuration

master-1# kubectl edit node worker-1

Add the following YAML bit under spec:

configSource:
    configMap:
        name: CONFIG_MAP_NAME # replace CONFIG_MAP_NAME with the name of the ConfigMap
        namespace: kube-system
        kubeletConfigKey: kubelet

Configure Kubelet Service

Create the kubelet.service systemd unit file:

cat <<EOF | sudo tee /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet \\
  --bootstrap-kubeconfig="/var/lib/kubelet/bootstrap-kubeconfig" \\
  --image-pull-progress-deadline=2m \\
  --kubeconfig=/var/lib/kubelet/kubeconfig \\
  --dynamic-config-dir=/var/lib/kubelet/dynamic-config \\
  --cert-dir= /var/lib/kubelet/ \\
  --network-plugin=cni \\
  --register-node=true \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

Reference: https://kubernetes.io/docs/tasks/administer-cluster/reconfigure-kubelet/