instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from that
  service instead.For instructions, refer to
  Configure Service Accounts for Pods.Grant permissions to a ServiceAccountYou can use the built-in Kubernetes
  role-based access control (RBAC)
  mechanism to grant the minimum permissions required by each service account.
  You create a role, which grants access, and then bind the role to your
  ServiceAccount. RBAC lets you define a minimum set of permissions so that the
  service account permissions follow the principle of least privilege. Pods that
  use that service account don't get more permissions than are required to
  function correctly.For instructions, refer to
  ServiceAccount permissions.Cross-namespace access using a ServiceAccountYou can use RBAC to allow service accounts in one namespace to perform actions
  on resources in a different namespace in the cluster. For example, consider a
  scenario where you have a service account and Pod in the dev namespace and
  you want your Pod to see Jobs running in the maintenance namespace. You could
  create a Role object that grants permissions to list Job objects. Then,
  you'd create a RoleBinding object in the maintenance namespace to bind the
  Role to the ServiceAccount object. Now, Pods in the dev namespace can list
  Job objects in the maintenance namespace using that service account.Assign a ServiceAccount to a PodTo assign a ServiceAccount to a Pod, you set the spec.serviceAccountName
  field in the Pod specification. Kubernetes then automatically provides the
  credentials for that ServiceAccount to the Pod. In v1.22 and later, Kubernetes
  gets a short-lived, automatically rotating token using the TokenRequest
  API and mounts the token as a
  projected volume.By default, Kubernetes provides the Pod
  with the credentials for an assigned ServiceAccount, whether that is the
  default ServiceAccount or a custom ServiceAccount that you specify.To prevent Kubernetes
  ```