Advanced Namespace Configuration and Automation
Namespace Isolation with Network Policies
Kubernetes network policies allow you to control the network traffic between pods within a namespace, as well as between pods in different namespaces. This can be particularly useful for implementing security measures and isolating sensitive workloads.
Here's an example of a network policy that blocks all incoming traffic to pods in the "prod" namespace, except for traffic from the "dev" namespace:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: prod-network-policy
namespace: prod
spec:
podSelector: {}
policyTypes:
- Ingress
ingress:
- from:
- namespaceSelector:
matchLabels:
env: dev
Namespace-scoped Resources
Certain Kubernetes resources, such as CustomResourceDefinitions (CRDs) and ClusterRoles, can be scoped to a specific namespace. This allows you to create and manage these resources on a per-namespace basis, providing more granular control and isolation.
Here's an example of a namespace-scoped CustomResourceDefinition (CRD):
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
name: myresources.labex.com
spec:
scope: Namespaced
group: labex.com
versions:
- name: v1
served: true
storage: true
names:
kind: MyResource
plural: myresources
singular: myresource
Namespace-scoped RBAC
You can also configure Role-Based Access Control (RBAC) on a per-namespace basis, allowing you to grant specific permissions to users or service accounts within a namespace.
Here's an example of a namespace-scoped Role and RoleBinding:
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: dev
name: developer-role
rules:
- apiGroups: [""] ## "" indicates the core API group
resources: ["pods", "services", "configmaps"]
verbs: ["get", "list", "watch", "create", "update", "delete"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: developer-role-binding
namespace: dev
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: developer-role
subjects:
- kind: ServiceAccount
name: my-service-account
namespace: dev
This configuration grants the "developer-role" permissions to the "my-service-account" service account within the "dev" namespace.
Namespace-scoped Monitoring and Logging
You can configure monitoring and logging solutions to be namespace-scoped, allowing you to collect and analyze data specific to a particular namespace. This can be useful for troubleshooting, performance analysis, and compliance purposes.
By leveraging these advanced namespace configuration and automation techniques, you can achieve a high degree of control, isolation, and visibility over your Kubernetes resources, ensuring your cluster remains secure, efficient, and aligned with your organization's needs.