How can I edit a Deployment without modify the file manually?

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You could do it via the REST API using the PATCH verb. However, an easier way is to use kubectl patch. The following command updates your app’s tag:

kubectl patch deployment myapp-deployment -p \
  '{"spec":{"template":{"spec":{"containers":[{"name":"myapp","image":"172.20.34.206:5000/myapp:img:3.0"}]}}}}'

According to the documentation, YAML format should be accepted as well. See Kubernetes issue #458 though (and in particular this comment) which may hint at a problem.

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