Why Is the Backend Server Group of an ELB Automatically Deleted After a Service Is Published to the ELB?

Symptom

After a Service is published to ELB, the workload is normal, but the pod port of the Service is not published in time. As a result, the backend server group of the ELB is automatically deleted.

Answer

1. If the ELB monitoring check fails during ELB creation, the backend server group will be deleted and will not be added after the Service becomes normal. If an existing SVC is updated, the backend server group is not deleted.
2. When a node is added or deleted, the node access mode in the cluster may change due to the cluster status change. To ensure normal service running, the ELB performs a refresh operation. The process is similar to that of updating the ELB.

Suggestions

Optimize the application to speed up the startup.