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Debugging CRs

Running into issues deploying any of the kapp-controller CRs? This page will help with commonly encountered issues.

If you can’t find what you are looking for here, please reach out to us on #carvel. We love hearing from users and are keen to help you resolve any issues!

Debugging kapp-controller CRs

Reconcile failed

Your first alert to a failure will come from the tool(s) (e.g. kapp or kubectl) you are using to deploy kapp-controller CRs. kapp will more immediately tell you if a resource you are creating or updating fails, but you will need to verify with a kubectl get if using kubectl to create/update.

You can verify a failure occurred by running a kubectl get for the resource you encountered the failure with. You can then see in the DESCRIPTION column of the output of kubectl get if the reconciliation process for the resource failed. An example of this is below:

NAMESPACE   NAME                  PACKAGE NAME          PACKAGE VERSION   DESCRIPTION                                                            AGE
foo         instl-pkg-test-fail   pkg.fail.carvel.dev   1.0.0             Reconcile failed: Error (see .status.usefulErrorMessage for details)   12s

status.usefulErrorMessage

Once you have confirmed an error occurred, you can review the status of the CR for more information.

Apps, PackageInstalls, and PackageRepsitories all feature a status property named usefulErrorMessage. usefulErrorMessage which contains an error message from kapp-controller or the stderr from the underlying tool used by kapp-controller (i.e. vendir, imgpkg, kbld, ytt, kapp, or helm).

usefulErrorMessage will be located at the bottom of the statuses if running a kubectl get or kubectl describe to view more information about a failure.

usefulErrorMessage can also be accessed more directly through kubectl like in the following examples:

# App errors
$ kubectl get apps/simple-app -o=jsonpath={.status.usefulErrorMessage} -n namespace

# PackageInstall errors
$ kubectl get packageinstall simple-app -o=jsonpath={.status.usefulErrorMessage} -n namespace

# PackageRepository errors (cluster scoped so no namespace)
$ kubectl get packagerepository repo -o=jsonpath={.status.usefulErrorMessage}

Errors from underlying tools (App CR and PackageInstall CR)

Failures can arise from fetch, template, deploy, or delete steps for an App CR. These failures correspond to issues with runtime information declared in the App CR’s spec. kapp-controller creates an App CR for every PackageInstall

Errors are reported as stderr from associated tools used in kapp-controller (i.e. vendir, imgpkg, kbld, ytt, kapp, and helm) or as direct messages from kapp-controller (e.g. when an App uses a ServiceAccount that doesn’t exist).

When a failure occurs with an App CR, you can find further details in the App CR’s DESCRIPTION column by running kubectl get apps/simple-app -n namespace:

NAME         DESCRIPTION                                                                                         SINCE-DEPLOY   AGE
simple-app   Delete failed: Preparing kapp: Getting service account: serviceaccounts "default-ns-sa" not found   3s             56m

In the case above, the error message shown is coming directly from kapp-controller, so all the information for the failure should be presented in the description column. This commonly occurs when references used by kapp-controller (e.g. secrets, configmaps, serviceaccounts) are not found by kapp-controller.

In cases where the error message does not originate from kapp-controller (e.g. a failed fetch event for a git repository), the stderr from the underlying tool (i.e. vendir, imgpkg, kbld, ytt, kapp, and helm) is shown in the App’s status.

In the App status, there is a field called usefulErrorMessage that displays the stderr for a failure during App reconciliation.

This usefulErrorMessage field can be found by running kubectl get apps/simple-app -o=jsonpath={.status.usefulErrorMessage} -n namespace. The kubectl command will return the stderr output from the App status to help you further understand the reason for the App failure.

The usefulErrorMessage can be helpful in pointing out where errors occurred from inputs in the App spec and also pinpoint the resource that caused a deployment failure. However, Apps will not surface errors of resources they are deploying to Kubernetes and further debugging of resources deployed by an App may be needed.

Debugging PackageInstall CRs

Failures for PackageInstalls can be viewed directly via the usefulErrorMessage property of the PackageInstall’s status. This usefulErrorMessage property comes from an App CR that is created as a result of creating a PackageInstall. More information on interpreting the error message from usefulErrorMessage can be found under the [Errors from underlying tools](#Errors from underlying tools (App CR and PackageInstall CR)). The underlying App CR will have the same name as the PackageInstall that you create.

You can also inpect the Package CR referenced by the PackageInstall CR for issues. You can view the Package details by running the following command:

$ kubectl describe package/<package name>

You can then view the .template.spec of the Package to see if there are any issues with the inputs of the Package. These inputs are eventually used to create the App for the PackageInstall and can lead to failures.

Debugging PackageRepository CRs

Failures for PackageRepositories can be viewed directly via the usefulErrorMessage property of the PackageRepository’s status. More information here

A common source of errors is being unable to fetch the PackageRepository contents. Please check the .spec.fetch portion of the PackageRepository spec for issues related to this.

Is the registry you are fetching from require authentication? If so, check out authenticating to private registries

You can also fetch the PackageRepository imgpkg bundle or image separately and inspect format of Package resources.