how to test a manifest without actually executing it in kubernetes

Question

I need to test a manifest in order to check the key-value pairs, i need to test it without actually executing it. How can i do this?

Answer 1

You can use --dry-run flag to test the manifest. 

This is really useful not only to ensure if the yaml syntax is right for a particular Kubernetes object but also to ensure that a spec has required key-value pairs.

kubectl create -f <test.yaml> --dry-run

Let us now look at an example Pod spec that will launch an nginx pod
 

 cat example_pod.yaml
---
apiVersion: v1
kind: Pod
metadata:
  name: my-nginx
  namespace: mynamespace
spec:
  containers:
    - name: my-nginx
      image: nginx

kubectl create -f example_pod.yaml --dry-run
pod/my-nginx created (dry run)