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kubernetes
kubectl apply --dry-run=client attempts to connect to the server
What happened?
I have an environment which doesn't have server credentials for security reasons for running PR checks on our gitops repository (post-merge actual application has a separate environment with credentials). I would like to do a dry-run check on the validity of the configuration in the PR, without having cluster credentials.
When I ran kubectl apply -f output --dry-run=client it prompted for connection details and failed
What did you expect to happen?
I expected --dry-run=client not to connect to the server
How can we reproduce it (as minimally and precisely as possible)?
- Create a kubeconfig with an empty connection token for your server (or no details at all)
- Run kubectl --kubeconfig=kubeconfig --dry-run=client apply -f output
- kubectl will prompt for username and password (or if you don't have server details, attempt to connect to localhost:8080 and fail)
Anything else we need to know?
No response
Kubernetes version
I'm using 1.26.14, but I also tested with 1.30.0
Cloud provider
n/a
OS version
Linux RHEL8
Install tools
Container runtime (CRI) and version (if applicable)
Related plugins (CNI, CSI, ...) and versions (if applicable)
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/remove-kind bug /kind support
AIUI: kubectl needs to know the API definition(s) for your cluster in order to do a client side dry run. I don't think we can avoid that but we could document why it happens.
Well then it's not really a client side validation is it. Is there any kind of validation I can do without giving pre approval PRs cluster credentials?
/remove-kind support /kind feature
Yes it is known that dry-run=client still requires to access to cluster (see more: https://github.com/kubernetes/kubernetes/pull/123337#discussion_r1505855167). /triage accepted /priority backlog
