kubeadm

kubeadm Cluster Installation

Checkout the official Kubernetes documentation links:

• Installation of kubeadm: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
• Kubernetes Cluster Creation using kubeadm:
  • Single Control Plane Cluster: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/
  • Highly available Cluster:
    • Options for highly available clusters: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/ha-topology/
    • Basic highly available cluster: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

Prometheus (kube-prometheus) ETCD Metrics Access

You need to create a secret that contains the ETCD healthcheck client cert and key.

kubectl \
    create \
    -n monitoring \
    secret generic \
    etcd-client-cert \
    --from-file=/etc/kubernetes/pki/etcd/ca.crt \
    --from-file=/etc/kubernetes/pki/etcd/healthcheck-client.crt \
    --from-file=/etc/kubernetes/pki/etcd/healthcheck-client.key

For more information checkout this comment: https://github.com/prometheus-community/helm-charts/issues/204#issuecomment-765155883