Implementation and Management of Policy
- Kubernetes policies are implemented and managed using the Kubernetes API and the kubectl command-line tool. To create and manage policies, administrators can use the Kubernetes API to create policy objects, which are then enforced by the Kubernetes platform.
- To create a policy, administrators can use the kubectl create policy command, specifying the type of policy (either resource-based or identity-based), the resources or identities that the policy applies to, and the rules and restrictions that should be enforced.
Here is an example of implementing a Kubernetes policy using the Go programming language:
Go
package main import ( "context" "fmt" "k8s.io/api/policy/v1beta1" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/client-go/kubernetes" "k8s.io/client-go/tools/clientcmd") func createPolicy(client *kubernetes.Clientset, policyName string, namespace string) error { policy := &v1beta1.PodSecurityPolicy{ ObjectMeta: metav1.ObjectMeta{ Name: policyName, Namespace: namespace, }, Spec: v1beta1.PodSecurityPolicySpec{ Privileged: false, SELinux: v1beta1.SELinuxStrategyOptions{ Rule: v1beta1.SELinuxStrategyRunAsAny, }, SupplementalGroups: v1beta1.SupplementalGroupsStrategyOptions{ Rule: v1beta1.SupplementalGroupsStrategyMustRunAs, Ranges: []v1beta1.IDRange{ { Min: 1, Max: 65535, }, }, }, RunAsUser: v1beta1.RunAsUserStrategyOptions{ Rule: v1beta1.RunAsUserStrategyMustRunAsNonRoot, }, FSGroup: v1beta1.FSGroupStrategyOptions{ Rule: v1beta1.FSGroupStrategyMustRunAs, Ranges: []v1beta1.IDRange{ { Min: 1, Max: 65535, }, }, }, Volumes: []v1beta1.FSType{ "*", }, AllowedCapabilities: []v1beta1.Capability{}, DefaultAddCapabilities: []v1beta1.Capability{}, RequiredDropCapabilities: []v1beta1.Capability{ "ALL", }, HostNetwork: false, HostIPC: false, HostPID: false, HostPorts: []v1beta1.HostPortRange{ { Min: 0, Max: 65535, }, }, }, |
To Create a Resource-based policy that limits the number of CPU resources
$ kubectl create policy cpu-limit --type=resource --resource=deployment --limit=1
To View existing policies
$ kubectl get policy
Use Cases for Kubernetes Policies
- Administrators can use policies to enforce rules and restrictions on the use of specific namespaces or labels within a cluster
- To Create Custom Policy types using the Kubernetes API.
- Policies can also be used in conjunction with other features of the Kubernetes platform, such as role-based access control (RBAC) and network policies
- To create more fine-grained controls over the use and management of resources within a cluster.
Kubernetes Policies
Pre-requisite: Kubernetes
In this article, we will be discussing Kubernetes policies, a key feature in the Kubernetes platform that allows administrators to enforce rules and restrictions on the use and management of resources within a cluster. We will cover the basics of Kubernetes policies, including their types and how they are implemented and managed, as well as delve into some of the more advanced features and use cases for Kubernetes policies.