EKS Node Group Nodes Not Able to Join the Cluster
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Internal
Overview
Creation of a new node group takes a long time, and eventually the state transitions to "Create failed". The corresponding autoscaling group is correctly created and the nodes are healthy. Yet, they cannot join the cluster.
Root Cause
The problem is caused by the fact that cluster security group loses all its inbound rules.
Fix
Locate the EKS cluster's cluster security group.
Add itself as an inbound rule: Type "All traffic", Source "Custom", data: its own ID.