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How can I issue a kubectl run that pulls an environment var from a k8s secret configmap?
Currently I have:
kubectl run oneoff -i --rm NAME --image=IMAGE --env SECRET=foo
358
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.
If you want to access data from a Secret in a Pod, one way to do that is to have Kubernetes make the value of that Secret be available as a file inside the filesystem of one or more of the Pod's containers. To configure that, you: Create a secret or use an existing one. Multiple Pods can reference the same secret.
When you create a Pod, you can set dependent environment variables for the containers that run in the Pod. To set dependent environment variables, you can use $(VAR_NAME) in the value of env in the configuration file.
Look into the overrides flag of the run command... it reads as:
An inline JSON override for the generated object. If this is non-empty, it is used to override the generated object. Requires that the object supply a valid apiVersion field.
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#run
So in your case I guess it would be something like:
kubectl run oneoff -i --rm --overrides='
{
"spec": {
"containers": [
{
"name": "oneoff",
"image": "IMAGE",
"env": [
{
"name": "ENV_NAME"
"valueFrom": {
"secretKeyRef": {
"name": "SECRET_NAME",
"key": "SECRET_KEY"
}
}
}
]
}
]
}
}
' --image= IMAGE
This is another one that does the trick:
kubectl run oneoff -i --rm NAME --image=IMAGE --env SECRET=$(kubectl get secret your-secret -o=jsonpath="{.server['secret\.yml']}")
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