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A Cloud Guru

Working with Kubernetes NetworkPolicies

By default, Kubernetes pods have unrestricted network access both inside and outside the cluster. However, it is often desirable to restrict network access to and from pods, particularly for security reasons. Kubernetes NetworkPolicies provide a flexible way to implement these networking restrictions, giving you control over all of the network traffic involving your pods. In this lab, walk through NetworkPolicies concepts, and examine some existing policies to determine how we can properly apply them to a pod.

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Path Info

Level

Intermediate

Duration

1h 0m

Published

Mar 31, 2019

Challenge

Provide the `web-gateway` Pod with Network Access to the Pods Associated with the `inventory-svc` Service
First, get a list of existing NetworkPolicies:
```
kubectl get networkpolicy
```
Examine inventory-policy more closely:
```
kubectl describe networkpolicy inventory-policy
```
Note that the policy selects pods with the label app: inventory, and provides incoming and outgoing network access to all pods with the label inventory-access: true.

Modify the web-gateway pod with kubectl edit pod web-gateway.

Add the inventory-access: "true" label to the pod under metdadata.labels.
```
...
metdadata:
  labels:
    inventory-access: "true"
...
```
Test access to the inventory-svc like so:
```
kubectl exec web-gateway -- curl -m 3 inventory-svc
```
Challenge

Provide the `web-gateway` Pod with Network Access to the Pods Associated with the `customer-data-svc` Service
Examine customer-data-policy more closely:
```
kubectl describe networkpolicy customer-data-policy
```
Note that the policy selects pods with the label app: customer-data, and provides incoming and outgoing network access to all pods with the label customer-data-access: true.

Modify the web-gateway pod with kubectl edit pod web-gateway.

Add the customer-data-access: "true" label to the pod under metadadata.labels:
```
...
metdadata:
  labels:
    inventory-access: "true"
    customer-data-access: "true"
...
```
Test access to the customer-data-svc like so:
```
kubectl exec web-gateway -- curl -m 3 customer-data-svc
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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