kubectl error You must be logged in to the server (Unauthorized) when accessing EKS cluster

Question

Hi guys!

I am doing the hands-on lab on AWS EKS and CodePipeline topic. See the link below

https://000062.awsstudygroup.com/

I am stuck in step 4.6 when I create a Pipeline using CloudFormation template. The Code Build failed because of an error as I attached in the photo.

Please help me check!

![Enter image description here](/media/postImages/original/IMUVEk9yMGQce0HKBkMeCbAw)

Accepted Answer

Hello there,

The `error: You must be logged in to the server (Unauthorized)` you encountered is because the `kubectl` in the CodeBuild is not configured properly for Amazon EKS or the IAM user or role credentials that you are using do not map to a Kubernetes RBAC user with sufficient permissions in your Amazon EKS cluster.

Things to check:
1. The Service role for CodeBuild service: eks-CodeBuildServiceRole should have this permission below. It gives it full access to EKS.

```
    {
      "Sid": "EKSAccessPolicy",
      "Effect": "Allow",
      "Action": [
        "eks:*"
      ],
      "Resource": "*"
    }
```
2. Mapping of the Service role for CodeBuild to a Kubernetes RBAC user.
From terminal Cloud9 to which you have connected EKS cluster, verify the configMap aws-auth has the right entry for the IAM role: eks-CodeBuildServiceRole with the command: 
```
kubectl edit configmaps aws-auth -n kube-system
```
The eks-CodeBuildServiceRole should be mapped to masters. Be sure your AWS_ACCOUNT_ID is substituted in the snippet below:
```
- groups:
  - system:masters
  rolearn: arn:aws:iam::{$AWS_ACCOUNT_ID}}:role/eks-CodeBuildServiceRole
  username: codebuild-eks
```

I was able to reproduce the steps in the guide. See the CodeBuild result.
![Enter image description here](/media/postImages/original/IMiS6uhiBTSqi54tXnO-rZlA)

kubectl error You must be logged in to the server (Unauthorized) when accessing EKS cluster

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