Tear down K8S cluster

                                                 Tear down K8S cluster

1) List all the nodes in K8S cluster.

[root@tssperf09 ~]# kubectl get nodes

NAME            STATUS    ROLES     AGE       VERSION

tssperf09.lab   Ready     master    44d       v1.9.2

tssperf10.lab   Ready     <none>    44d       v1.9.2

tssperf11.lab   Ready     <none>    44d       v1.9.2

[root@tssperf09 ~]#

2) First drain the node and make sure that the node is empty before shutting it down.

i) First drain all the non-master node's .

[root@tssperf09 ~]# kubectl drain tssperf10.lab --delete-local-data --force --ignore-daemonsets

node "tssperf10.lab" cordoned

WARNING: Ignoring DaemonSet-managed pods: calico-node-k8wcz, kube-proxy-87mt7, mapr-volplugin-pk5q8; Deleting pods with local storage: mapr-volplugin-pk5q8

pod "calico-kube-controllers-d554689d5-4456k" evicted

node "tssperf10.lab" drained

[root@tssperf09 ~]#

ii) Now drain the master node itself .

[root@tssperf09 ~]# kubectl drain tssperf09.lab --delete-local-data --force --ignore-daemonsets

node "tssperf09.lab" cordoned

WARNING: Ignoring DaemonSet-managed pods: calico-etcd-rvxmg, calico-node-qrw75, kube-proxy-2ztzj, mapr-volplugin-rcsz9; Deleting pods not managed by ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet: etcd-tssperf09.lab, kube-apiserver-tssperf09.lab, kube-controller-manager-tssperf09.lab, kube-scheduler-tssperf09.lab, maprfs-volume-example; Deleting pods with local storage: mapr-volplugin-rcsz9

pod "calico-kube-controllers-d554689d5-6j5b5" evicted

pod "maprfs-volume-example" evicted

pod "kube-dns-6f4fd4bdf-jndmv" evicted

node "tssperf09.lab" drained

[root@tssperf09 ~]#

3) Now we should see the node's has Scheduling disabled for new POD shouldn't land on this nodes .

[root@tssperf09 ~]# kubectl get nodes

NAME            STATUS                     ROLES     AGE       VERSION

tssperf09.lab   Ready,SchedulingDisabled   master    44d       v1.9.2

tssperf10.lab   Ready,SchedulingDisabled   <none>    44d       v1.9.2

tssperf11.lab   Ready,SchedulingDisabled   <none>    44d       v1.9.2

4) Finally delete slave nodes followed by master node .

[root@tssperf09 ~]# kubectl delete node tssperf10.lab

node "tssperf10.lab" deleted

[root@tssperf09 ~]# kubectl get nodes

NAME            STATUS                     ROLES     AGE       VERSION

tssperf09.lab   Ready,SchedulingDisabled   master    44d       v1.9.2

tssperf11.lab   Ready,SchedulingDisabled   <none>    44d       v1.9.2

[root@tssperf09 ~]# kubectl delete node tssperf11.lab

node "tssperf11.lab" deleted

[root@tssperf09 ~]# kubectl delete node tssperf09.lab

node "tssperf09.lab" deleted

[root@tssperf09 ~]# kubectl get nodes

No resources found.

[root@tssperf09 ~]# 

5) Finally reset all kubeadm installed state on every node.

[root@tssperf09 ~]# kubeadm reset

[preflight] Running pre-flight checks.

[reset] Stopping the kubelet service.

[reset] Unmounting mounted directories in "/var/lib/kubelet"

[reset] Removing kubernetes-managed containers.

[reset] Deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/run/kubernetes /var/lib/etcd]

[reset] Deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki]

[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]

[root@tssperf09 ~]#