Kubernetes Book 3 - Installing Kubernetes

Play with Kubernetes

http://play-with-k8s.com

Run few commands.

$ docker version
Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.40
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:25:41 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.5
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.12
  Git commit:       633a0ea
  Built:            Wed Nov 13 07:24:18 2019
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          1.2.10
  GitCommit:        b34a5c8af56e510852c35414db4c1f4fa6172339
 runc:
  Version:          1.0.0-rc8+dev
  GitCommit:        3e425f80a8c931f88e6d94a8c831b9d5aa481657
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

$ kubectl version -o yaml
clientVersion:
  buildDate: "2019-11-13T11:21:43Z"
  compiler: gc
  gitCommit: 500f5aba80d71253cc01ac6a8622b8377f4a7ef9
  gitTreeState: clean
  gitVersion: v1.14.9
  goVersion: go1.12.12
  major: "1"
  minor: "14"
  platform: linux/amd64
serverVersion:
  buildDate: "2019-12-11T12:32:32Z"
  compiler: gc
  gitCommit: 575467a0eaf3ca1f20eb86215b3bde40a5ae617a
  gitTreeState: clean
  gitVersion: v1.14.10
  goVersion: go1.12.12
  major: "1"
  minor: "14"
  platform: linux/amd64

Use the kubeadm command to initialize a new cluster.

$ kubeadm init --apiserver-advertise-address $(hostname -i)
...
Your Kubernetes control-plane has initialized successfully!

Verify the cluster with the kubectl command.

$ kubectl get nodes
NAME    STATUS     ROLES    AGE     VERSION
node1   NotReady   master   9m29s   v1.14.9

Initialize the Pod network(cluster networking).

$ kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
serviceaccount/weave-net created
clusterrole.rbac.authorization.k8s.io/weave-net created
clusterrolebinding.rbac.authorization.k8s.io/weave-net created
role.rbac.authorization.k8s.io/weave-net created
rolebinding.rbac.authorization.k8s.io/weave-net created
daemonset.apps/weave-net created

Verify the cluster again to see if node1 has changed to Ready.

$ kubectl get nodes
NAME    STATUS   ROLES    AGE   VERSION
node1   Ready    master   13m   v1.14.9

Copy the kubeadm join command from the oputput of the kubeadm init.

Click the + ADD NEW INSTANCE button in the left pane of the PWK window.

Paste the kubeadm join command into the terminal of node2.

[node2 ~]$ kubeadm join 192.168.0.28:6443 --token usb8x1.xx76fcfgedotamdv \
>     --discovery-token-ca-cert-hash sha256:bc3287994658c1eb6005e2d1de316bb5c9a34341bf71ef8af569bdd4666340b3

Switch back to node1 and run another kubectl get nodes.

[node1 ~]$ kubectl get nodes
NAME    STATUS   ROLES    AGE     VERSION
node1   Ready    master   19m     v1.14.9
node2   Ready    <none>   2m19s   v1.14.9