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Kubernetes supports the following authorization modes:
RBAC Concepts:
a. get, list
(read-only)
b. create, update, patch, delete, deletecollection
(read-write)
Types of Roles:
Default Roles:
system:kube-controller-manager
or system:node
You may use the following command to list the cluster roles on the cluster:
kubectl get clusterroles kubectl get clusterroles <name-of-role> -o yaml
Many roles are predefined on a cluster by the installers. It is helpful to use the describe command to view particulars:
kubectl describe clusterroles view
To illustrate the use of Role-Binding, we will create a namespace, role, and bind it for a namespace-wide example:
kubectl create namespace dev-test kubectl --namespace=dev-test create serviceaccount dev-test-account kubectl --namespace=dev-test create role dev-tester-view --verb=get --verb=list --resource=pods kubectl --namespace=dev-test describe role/dev-tester-view kubectl --namespace=dev-test create rolebinding dev-viewer --role=dev-tester-view --serviceaccount=dev-test:dev-test-account kubectl --namespace=dev-test describe rolebinding/dev-viewer
To illustrate the used of Role-Binding we will create a namespace, role, and bind it for a namespace-wide example:
kubectl --namespace=dev-test create rolebinding dev-viewer --role=dev-tester-view --serviceaccount=dev-test:dev-test-account kubectl --namespace=dev-test describe rolebinding/dev-viewer
can-i
Argument to Test Role BindingTo test the role binding example, we can use the can-i
argument to verify permissions:
kubectl --namespace=dev-test auth can-i --as=system:serviceaccount:dev-test:dev-test-account list pods kubectl --namespace=dev-test auth can-i --as=system:serviceaccount:dev-test:dev-test-account list services
As the Kubernetes Eco-System expands, it is important to consider tooling to help maintain enterprise installations. The following is a list of tools to consider for Role Based Access Control (RBAC) use:
audit2rbac
: A tool to automatically determine what permissions are necessary for certain applications, and can generate RBAC role binding for you
kube2iam
: A tool that provides AWS IAM credentials to containers based on annotations
rbac-manager
: A Kubernetes operator that simplifies the management of role bindings and service accounts
RBAC has become the standard
for Enterprise Kubernetes Authorization. Ensure that the kube-apiserver
is started with the option --authorization-mode=RBAC
.
Disable the default service token as most applications do not require access to the API. This can be done by setting automountServiceAccountToken:false
in the pods spec for your applications. Use dedicated service account for any applications that require access to the API.