I'm having trouble with my EKS instances; they keep failing to join the Kubernetes cluster and I'm getting this error: "Instances failed to join the kubernetes cluster." Specifically, I'm seeing an error message that says: `Error: waiting for EKS Node Group (my-eks-cluster:my-node-group) create: unexpected state 'CREATE_FAILED', wanted target 'ACTIVE'. last error: ... NodeCreationFailure`.
Here's an outline of my Terraform code if that helps:
- I'm using `aws_eks_node_group` with specific security groups and IAM roles set up.
- My VPC configuration seems to be in place, with both public and private subnets defined.
Any advice or insights on what might be causing this issue? Thanks!
6 Answers
You might need to adjust your security group settings. Allowing traffic on port 10250 can solve communication issues between the cluster API and your node kubelets. Also, ensure that you have the AmazonEKSClusterPolicy attached to your cluster role for smoother operations. Additionally, I recommend checking out the Terraform examples for setting up EKS—they’re super helpful!
Another possibility is that you have an invalid AMI ID or a network issue somewhere in your setup. Be sure to verify everything!
Just a heads-up: your issue might also arise from missing VPC endpoint configurations for ECR. Double-check that your nodes can pull the AWS VPC CNI container image and that they have DNS resolution. Your security group setup should allow all necessary traffic too.
Don’t forget to tag your subnet properly! Nodes need the tag `kubernetes.io/cluster/myclustername: shared`. This can often be overlooked but is crucial for node functionality.
Check the logs on your node, particularly the cloud-init logs. They might give you clues about what's failing—be it networking, permissions, or even cluster discovery issues. Also, make sure you have a CNI plugin installed; it often helps resolve these kinds of problems.
First things first, double-check your networking configuration. Ensure that your routes are correct. I’ve seen this kind of error pop up when nodes can’t communicate properly due to networking issues.
Yeah, I felt the same way! I ran into problems when my nodes couldn't access the internet. It's definitely worth verifying your network settings.
Exactly! I’ve seen this issue before; sometimes the bootstrap script doesn’t run correctly due to misconfigurations.