To protect the Kubernetes cluster from misuse of kubeadm commands, the following security measures should be implemented:
Restrict Access to Kubeadm:
Only authorized administrators responsible for cluster setup and troubleshooting should have access to kubeadm. This prevents unauthorized users from executing high-risk commands that could disrupt or compromise the cluster.
Implement Role-Based Access Control (RBAC):
Use Kubernetes RBAC to define precise roles and permissions. Ensure that only users with the required roles, such as cluster administrators, have the permissions needed to run kubeadm commands. This limits the exposure of high-risk commands to authorized personnel only.
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: kubeadm-admin
rules:
- apiGroups: [""]
resources: ["nodes"]
verbs: ["get", "list", "create", "delete"]
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubeadm-admin-binding
subjects:
- kind: User
name: <admin-username>
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: kubeadm-admin
apiGroup: rbac.authorization.k8s.io
