mini Kubernetes cluster from a hard way

An experimental mini Kubernetes cluster:

• separate data (etcd) and master (kube-apiserver) to run at different instance.
• populate multi endpoints for kube-apiserver
  • localhost endpoint to interact with kube-controller-manager and kube-scheduler
  • internal endpoint communication with worker nodes kubelet
  • external endpoint by kubectl
• containerd runtime
• explore CNI plugins with Network Policy support

details

• Kubernetes v1.15.3
• etcd v3.3.15
• containerd 1.2.8
• CNI v0.7.6
  • Flannel 0.11.0
  • Weave Net 2.5.2
• CoreDNS v1.5.0
• Ubuntu 16.04.6 LTS

steps

• Preparation
• Bootstrapping the Data etcd Node
• Bootstrapping the Control Plane
• Bootstrapping the Worker Nodes
  • runtime containerd
• Deploying CNI Networking Plugin
  • flannel
  • weave net
• Deploying the DNS Cluster Add-on

output

NAME                STATUS   ROLES    AGE     VERSION   INTERNAL-IP    EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
mini-k8s-worker-1   Ready    <none>   3m35s   v1.15.3   172.18.30.52   <none>        Ubuntu 16.04.6 LTS   4.4.0-161-generic   containerd://1.2.8