I'm having trouble getting my EKS instances to join the Kubernetes cluster. I'm seeing an error that says "Instances failed to join the Kubernetes cluster." I've shared my Terraform code below, which includes configurations for my AWS provider, VPC, security groups, and EKS cluster setup. Can anyone point me in the right direction to fix this issue? Thanks!
5 Answers
Consider allowing port 10250 on your security group, as it might be blocking the cluster API from talking to the node's kubelets. You might also need to attach the AmazonEKSClusterPolicy to your cluster role to ensure proper permissions.
Ensure that your subnets are tagged correctly. Each subnet with nodes should have the tag `kubernetes.io/cluster/myclustername: shared`. If the tags are missing, the nodes might fail to register properly.
Good catch! Last time I had a similar issue, it was due to missing tags, and the bootstrap script wasn't running as expected either.
You should check the logs on your node. Start with the cloud-init logs to see if there's any indication of issues related to networking or permissions. Also, ensure you have a CNI plugin installed, as the error can stem from network components not being ready.
It sounds like you might want to check your networking setup. Make sure that your route tables and security groups are configured properly to allow traffic between your instances and the cluster. A missing route could be preventing your nodes from reaching necessary services.
I faced a similar issue when my nodes couldn’t connect to the Internet. Make sure your instances have the right network permissions.
It could also be a network issue or invalid Amazon Machine Image (AMI) IDs for your nodes. Double-check that your nodes can pull images and connect to the required AWS services.
Absolutely! I've found that if you block necessary ports, the nodes won't transition to a 'ready' state.