Trying to create a namespace in an AWS EKS cluster with kubectl - Getting: Error from server (Forbidden): namespaces is forbidden

Question

I am trying to create a namespace in an AWS EKS cluster and keep getting an error.

I can do everything I want using the default namespace yet when I try to create a new namespace name I am forbidden.

It must be something that I have done incorrectly with the user "thera-eks". Perhaps the role binding?

It looks like I gave the role access to everything since in the rules I gave it the * wildcard.

The command I use is -

kubectl create namespace ernie

The error I get is -

Error from server (Forbidden): namespaces is forbidden: User "thera-eks" cannot create resource "namespaces" in API group "" at the cluster scope

My role.yaml is:

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: full_access
rules:
- apiGroups: ["*"]
  resources: ["*"]
  verbs: ["*"]

My rolebinding.yaml is:

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: full_access_role_binding
subjects:
- kind: User
  name: thera-eks
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: Role
  name: full_access
  apiGroup: rbac.authorization.k8s.io

The aws-auth config map is:

data:
  mapRoles: |
    - groups:
      - system:bootstrappers
      - system:nodes
      rolearn: arn:aws:iam::9967xxxxxxxx:role/eksctl-ops-nodegroup-linux-ng-sys-NodeInstanceRole-346VJPTOXI7L
      username: system:node:{{EC2PrivateDNSName}}
    - groups:
      - eks-role
      - system:master
      rolearn: arn:aws:iam::9967xxxxxxxx:role/thera-eks
      username: thera-eks
  mapUsers: |
    - userarn: arn:aws:iam::9967xxxxxxxx:user/test-ecr
    username: test-ecr
    groups:
    - eks-role

The AWS IAM permissions JSON for the role "thera-eks" is -

 {
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ecr:BatchGetImage",
                "ecr:BatchCheckLayerAvailability",
                "ecr:CompleteLayerUpload",
                "ecr:DescribeImages",
                "ecr:DescribeRepositories",
                "ecr:GetDownloadUrlForLayer",
                "ecr:InitiateLayerUpload",
                "ecr:ListImages",
                "ecr:PutImage",
                "ecr:UploadLayerPart",
                "ecr:GetAuthorizationToken"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "eks:*",
                "iam:ListRoles",
                "sts:AssumeRole"
            ],
            "Resource": "*"
        }
    ]
}

You have created a Role but Role only applies in the context of a Namespace -- a ClusterRole is the thing which spans across Namespaces (and thus would be capable of creating a Namespace itself) — mdaniel
– mdaniel, Commented Nov 17, 2020 at 3:40

Wytrzymały Wiktor · Accepted Answer · 2020-11-17 10:25:58Z

@mdaniel and @PEkambaram are right but I would like to expand and back it up with the official docs for better understanding:

An RBAC Role or ClusterRole contains rules that represent a set of permissions. Permissions are purely additive (there are no "deny" rules).

A Role always sets permissions within a particular namespace; when you create a Role, you have to specify the namespace it belongs in.

ClusterRole, by contrast, is a non-namespaced resource. The resources have different names (Role and ClusterRole) because a Kubernetes object always has to be either namespaced or not namespaced; it can't be both.

ClusterRoles have several uses. You can use a ClusterRole to:

define permissions on namespaced resources and be granted within individual namespace(s)

define permissions on namespaced resources and be granted across all namespaces

define permissions on cluster-scoped resources

If you want to define a role within a namespace, use a Role; if you want to define a role cluster-wide, use a ClusterRole.

You will also find an example of a ClusterRole:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  # "namespace" omitted since ClusterRoles are not namespaced
  name: secret-reader
rules:
- apiGroups: [""]
  #
  # at the HTTP level, the name of the resource for accessing Secret
  # objects is "secrets"
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]

and for a ClusterRoleBinding:

apiVersion: rbac.authorization.k8s.io/v1
# This cluster role binding allows anyone in the "manager" group to read secrets in any namespace.
kind: ClusterRoleBinding
metadata:
  name: read-secrets-global
subjects:
- kind: Group
  name: manager # Name is case sensitive
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: secret-reader
  apiGroup: rbac.authorization.k8s.io

The linked docs will show you all the necessary details with examples that would help understand and setup your RBAC.

P Ekambaram · Accepted Answer · 2020-11-17 07:16:09Z

0

User "thera-eks" doesnt have permissions to create namespace.

Use the below command to check if you are allowed to create namespace

kubectl auth can-i create namespace

You need to have Cluster level permissions to create namespace object. Define clusterrole and map the user in clusterrolebindings

edited Nov 17, 2020 at 7:16

answered Nov 17, 2020 at 7:08

P Ekambaram

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Comments

Yorkshire SA · Accepted Answer · 2024-08-20 13:56:14Z

0

You need to add the "AmazonEKSClusterAdminPolicy" to the the role you are using to access the cluster in EKS > Cluster > Access > IAM access entries.

answered Aug 20, 2024 at 13:56

Yorkshire SA

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