What are some examples of Kubernetes network policies?

What are some examples of Kubernetes network policies?

Kubernetes network policies are used to control the traffic between pods. Here are a few examples:

1. Allow traffic from specific pods: You can create a policy that allows traffic only from certain pods based on labels.
2. Deny all ingress traffic: A policy can be set to deny all incoming traffic to a pod unless explicitly allowed.
3. Allow traffic from a namespace: You can allow traffic from all pods in a specific namespace. Would you like to see the YAML configurations for these examples?

Yes, please provide the YAML configurations.

Sure! Here are the YAML configurations for the examples:

1. Allow traffic from specific pods:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-specific-pods
spec:
  podSelector:
    matchLabels:
      app: my-app
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend

2. Deny all ingress traffic:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all-ingress
spec:
  podSelector:
    matchLabels:
      app: my-app
  policyTypes:
  - Ingress

3. Allow traffic from a namespace:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-namespace
spec:
  podSelector:
    matchLabels:
      app: my-app
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          name: frontend-namespace

Do you need more examples or explanations?

These examples are great! Can you explain how to apply these policies?

To apply these network policies, you can use the kubectl apply command. Here’s how you can do it:

1. Save the YAML configuration to a file, for example, network-policy.yaml.
2. Run the command: kubectl apply -f network-policy.yaml.
3. Verify the policy is applied by using kubectl get networkpolicies. Would you like to know more about troubleshooting network policies?