Kubernetes Cookbook - Second Edition

Changing the configuration of a ReplicaSet

The subcommands known as edit, patch, and replace can help to update live Kubernetes resources. All these functionalities change the settings by way of modifying a configuration file. Here we just take edit, for example.

The subcommand edit lets users modify resource configuration through the editor. Try to update your ReplicaSet through the command kubectl edit rs $REPLICASET_NAME; you will access this resource via the default editor with a YAML configuration file:

// demonstrate to change the number of Pod replicas.$ kubectl get rsNAME                  DESIRED   CURRENT   READY     AGEmy-first-replicaset   3         3         3         2m// get in the editor, modify the replica number, then save and leave$ kubectl edit rs my-first-replicaset# Please ...