🏢 Kubernetes Namespace Management Explore More Namespace Topics

🔍 What is a Namespace?

A Kubernetes Namespace provides a mechanism for isolating groups of resources within a single cluster. It enables you to create multiple virtual clusters within one physical cluster, helping to separate environments and manage access control.
Example: You can use different namespaces like dev, test, and prod to isolate resources for various environments.

📄 Namespace YAML Example

apiVersion: v1
kind: Namespace
metadata:
  name: dev
  labels:
    environment: development

🛠️ Managing Namespaces

You can manage namespaces using various kubectl commands. Namespaces help in organizing your cluster and applying specific policies.
Examples:

# List all namespaces
kubectl get namespaces

# Describe a specific namespace
kubectl describe namespace dev

# Create or update a namespace from a YAML file
kubectl apply -f namespace.yaml

⚖️ Setting Resource Quotas

Resource Quotas allow you to limit the total amount of resources that can be consumed in a Namespace. This helps prevent one team or application from consuming all the cluster resources.
Example: Limit the number of Pods and CPU/memory usage in a namespace.

apiVersion: v1
kind: ResourceQuota
metadata:
  name: compute-resources
  namespace: dev
spec:
  hard:
    pods: "10"
    requests.cpu: "4"
    requests.memory: 8Gi
    limits.cpu: "8"
    limits.memory: 16Gi

📊 Setting Limit Ranges

Limit Ranges set default resource limits and requests for containers in a Namespace when not specified. This ensures that all containers have minimum resource allocations.
Example: Define default limits and requests for CPU and memory for containers.

apiVersion: v1
kind: LimitRange
metadata:
  name: limits
  namespace: dev
spec:
  limits:
  - default:
      cpu: "500m"
      memory: 512Mi
    defaultRequest:
      cpu: "200m"
      memory: 256Mi
    type: Container

🩺 Troubleshooting Namespaces

When issues arise with resource allocation or isolation, check your Namespace details along with applied quotas and limit ranges.
Examples:

# Describe a namespace for details and events
kubectl describe namespace dev

# List Resource Quotas in the namespace
kubectl get resourcequota -n dev

# List Limit Ranges in the namespace
kubectl get limitrange -n dev

📢 Conclusion

Kubernetes Namespaces are essential for organizing your cluster resources, ensuring isolation, and applying limits to prevent resource abuse. By using Resource Quotas and Limit Ranges, you can effectively manage and allocate resources for different teams or environments.