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How to analyze Controller Manager, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Controller Manger is the internal control center of K8S.

Different protocols are created within the Manager for different Controller to listen for changes in their respective resources on the etcd, and trigger the change logic of the response when changes occur.

Almost all Controller rely on a special data structure-SharedInformer, which

1. Constantly monitoring changes in certain resources on the etcd

two。 Cache the resources followed on the etcd locally, and get the old/new status of the resources when changes occur.

3. Trigger the registered handler based on the change

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