I created a cluster:
gcloud container clusters create testso there will be 3 nodes:
kubectl get nodes
NAME STATUS ROLES AGE VERSION
gke-test-default-pool-cec920a8-9cgz Ready <none> 23h v1.9.7-gke.5
gke-test-default-pool-cec920a8-nh0s Ready <none> 23h v1.9.7-gke.5
gke-test-default-pool-cec920a8-q83b Ready <none> 23h v1.9.7-gke.5then I delete a node from the cluster
kubectl delete node gke-test-default-pool-cec920a8-9cgz
node "gke-test-default-pool-cec920a8-9cgz" deletedno new node is created.
Then I delete all nodes. still there is no new node created.
kubectl get nodes
No resources found.Am I doing something wrong? I suppose it can automatically bring up new node if some node died.
Kubernetes is a system for managing workloads and not the machines. Kubernetes node object reflects the state of the underlying infrastructure.
As such node objects are automatically managed by Kubernetes. "kubectl delete node" simply removes a serialized object from Kubernetes "etcd" storage. It does nothing to delete VM on GCE side where the kubernetes node is hosted. "kubectl delete node" is not meant to be used to remove nodes. Node pool itself carries the desired declared state, which cannot be altered by the "kubectl delete node" command.
If you want to remove a node you should resize the instance group.
After running kubectl delete node gke-test-default-pool-cec920a8-9cgz run gcloud compute instances delete gke-test-default-pool-cec920a8-9cgz
This will actually delete VM (kubectl delete only "disconnects" it from the cluster). GCP will recreate the VM and it will automatically rejoin the cluster.