If there are too many pods, the Replication Controller terminates the extra pods. If there are too few, the

Replication Controller starts more pods

1.

A relocation controller is an object that enable you to easily create multiple pods, then make sure that

number of pods always exists.

2.

if a pod get crashed, terminated then RC will automatically recreate the new pod with similar

configuration.

3.

4. RC is recommended if you just want to make sure 1 pod is always running, even after system reboot.

5. You can run the RC with 1 replica & the RC make sure that pod is always running.  

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apiVersion: v1

kind: ReplicationController

metadata:

 name: rcpod

spec:

 replicas: 3

 selector:

 app: rcpod

 template:

 metadata:

 name: rcpod

 labels:

 app: rcpod

 spec:

 containers:

 - name: rcpod

 image: ubuntu

 command: ["/bin/bash", "-c", "while true; do echo c1; sleep 5 ; done"]