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Here I can update the envs through kubectl patch, then is there any method that can delete envs except re-deploy a deployment.yaml?
$ kubectl patch deployment demo-deployment -p '{"spec":{"template":{"spec":{"containers":[{"name": "demo-deployment","env":[{"name":"foo","value":"bar"}]}]}}}}'
deployment.extensions "demo-deployment" patched
Can I delete the env "foo" through command line not using a re-deploy on the whole deployment?
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There are two ways to define environment variables with Kubernetes: by setting them directly in a configuration file, from an external configuration file, using variables, or a secrets file. This tutorial shows both options, and uses the Humanitec getting started application used in previous tutorials.
This is coming late but for newcomers, you can use the following kubectl command to remove an existing env variable from a deployment
kubectl set env deployment/DEPLOYMENT_NAME VARIABLE_NAME-
Do not omit the hyphen (-) at the end
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