DevOps KB Pages

A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. Usually, you define a Deployment and let that Deployment manage ReplicaSets automatically. --- The reason why the Selector is added to the spec of a Kubernetes ReplicaSet is to allow it to manage Pods that match a specified label, regardless of whether the ReplicaSet itself created them . This is particularly useful because it enables the ReplicaSet to manage Pods that might have been created manually or by another process (assuming they don't already have another controller managing them). As long as the Pods have the same labels that match the ReplicaSet's Selector, the ReplicaSet controller will treat them as its own and manage their lifecycle—ensuring the desired number of replicas is running. This behavior helps the controller maintain the correct state, but it also means care should be taken when using labels to avoid conflicting control over Pods by different controllers. Wh...