kubernetes hidden replica set? - kubernetes

Question

I'm learning Kubernetes and just came across an issue and would like to check if anyone else has come across it,
user#ubuntu:~/rc$ kubectl get rs ### don’t see any replica set
user#ubuntu:~/rc$
user#ubuntu:~/rc$
user#ubuntu:~/rc$ kubectl get pod
NAME READY STATUS RESTARTS AGE
bigwebstuff-673k9 1/1 Running 0 7m
bigwebstuff-cs7i3 1/1 Running 0 7m
bigwebstuff-egbqd 1/1 Running 0 7m
user#ubuntu:~/rc$
user#ubuntu:~/rc$
user#ubuntu:~/rc$ kubectl delete pod bigwebstuff-673k9 bigwebstuff-cs7i3 #### delete pods
pod "bigwebstuff-673k9" deleted
pod "bigwebstuff-cs7i3" deleted
user#ubuntu:~/rc$
user#ubuntu:~/rc$ kubectl get pod #### the deleted pods regenerated
NAME READY STATUS RESTARTS AGE
bigwebstuff-910m9 1/1 Running 0 6s
bigwebstuff-egbqd 1/1 Running 0 8m
bigwebstuff-fksf6 1/1 Running 0 6s
You see the deleted pods are regenerated, though I can’t find the replica set, as if a hidden replicate set exist somewhere.
The 3 pods are started from rc.yaml file as follows,
user#ubuntu:~/rc$ cat webrc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: bigwebstuff
labels:
name: bigwebstuff
spec:
replicas: 3
selector:
run: testweb
template:
metadata:
labels:
run: testweb
spec:
containers:
- name: podweb
image: nginx
ports:
- containerPort: 80
But it didn’t show up after I use the yams file to create the pods.
Any idea on how to find the hidden replica set? Or why the pods gets regenerated?

Answer 1

A "ReplicaSet" is not the same thing as a "ReplicationController" (although they are similar). The kubectl get rs command lists replica sets, whereas the manifest file in your question creates a replication controller. Instead, use the kubectl get rc command to list replication controllers (or alternatively, change your manifest file to create a ReplicaSet instead of a ReplicationController).
On the difference between ReplicaSets and ReplicationControllers, let me quote the documentation:
Replica Set is the next-generation Replication Controller. The only difference between a Replica Set and a Replication Controller right now is the selector support. Replica Set supports the new set-based selector requirements as described in the labels user guide whereas a Replication Controller only supports equality-based selector requirements.

Answer 2

Replica sets and replication controllers are not the same thing. Try the following:
kubectl get rc
And then delete accordingly.