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added warning for changing mount configuration with KiC driver on exsting cluster #9172

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Asarew
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@Asarew Asarew commented Sep 3, 2020

This PR prints a warning when changing the mount configuration on an existing cluster when using either Docker or podman.

As discussed in #8159 (comment)

@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Sep 3, 2020
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Hi @Asarew. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Sep 3, 2020
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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Asarew
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Can one of the admins verify this patch?

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Asarew commented Sep 3, 2020

/assign @tstromberg

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Asarew commented Sep 3, 2020

/assign @josedonizetti

mount := viper.GetString(mountString)
if len(existing.ContainerVolumeMounts) != 1 || existing.ContainerVolumeMounts[0] != mount {
out.WarningT("Due to the limitations of {{.driver}}, it's not possible to the change mount configuration of an existing cluster.", out.V{"driver": existing.Driver})
out.WarningT("If necessary delete and recreate the cluster, proceeding with old mount configuration")
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This should exit rather than ignoring the user. Maybe something like:

exit.Error(reason.GuestMountConflict, "Sorry, {{.driver}} does not allow mounts to be changed after container creation (previous mount: {{.previous}}, new mount: {{.new}})")

(You would need to add a GuestMountConflict reason, but it shouldn't be too difficult to do so)

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Merging as we should have this warning for this release, though we should continue to improve upon it. Tested locally, works great!

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5 participants