Overview:

Securing a Kubernetes cluster involves implementing best practices at every level, including authentication, authorization, network security, and Pod security.

Key Concepts:

1. Authentication:

   • Kubernetes supports multiple authentication methods, including client certificates, tokens, and external identity providers (OIDC).

2. Authorization:

   • Kubernetes uses Role-Based Access Control (RBAC) to manage user and application permissions.

3. Pod Security Standards:

   • Kubernetes enforces security policies to restrict Pod behavior.

Hands-on Activity:

1. Enable RBAC in your cluster:

   kubectl get clusterrolebindings

2. Create a role with limited permissions:

   apiVersion: rbac.authorization.k8s.io/v1
   kind: Role
   metadata:
     namespace: default
     name: pod-reader
   rules:
   - apiGroups: [""]
     resources: ["pods"]
     verbs: ["get", "watch", "list"]

   kubectl apply -f pod-reader-role.yaml

3. Bind the role to a user:

   apiVersion: rbac.authorization.k8s.io/v1
   kind: RoleBinding
   metadata:
     name: read-pods
     namespace: default
   subjects:
   - kind: User
     name: jane
     apiGroup: rbac.authorization.k8s.io
   roleRef:
     kind: Role
     name: pod-reader
     apiGroup: rbac.authorization.k8s.io

   kubectl apply -f role-binding.yaml