Uninstalling Fission

Uninstallation guide for Fission

This command removes Fission from your cluster. Use it when you want to uninstall the current version and install Fission as a fresh instance.

helm uninstall <release name>

Get the release name by running helm list and replace with the actual <release name>

The above command will only delete the installed services. Custom resources that were created by Fission will need to be manually deleted.

Get a list of fission CRDs

kubectl get crd | grep "fission.io"

NAME                                       CREATED AT
canaryconfigs.fission.io                   2022-01-17T05:47:28Z
environments.fission.io                    2022-01-17T05:47:29Z
fissiontenants.fission.io                  2022-01-17T05:47:29Z
functions.fission.io                       2022-01-17T05:47:29Z
httptriggers.fission.io                    2022-01-17T05:47:29Z
kuberneteswatchtriggers.fission.io         2022-01-17T05:47:29Z
messagequeuetriggers.fission.io            2022-01-17T05:47:29Z
packages.fission.io                        2022-01-17T05:47:30Z
timetriggers.fission.io                    2022-01-17T05:47:30Z

First delete the custom resources of each kind, replacing <crd-name> with the actual CRD name (for example functions.fission.io):

kubectl get <crd-name> -o name | xargs -n1 kubectl delete

Then remove the CRD definitions themselves:

kubectl get crd -o name | grep "fission.io" | xargs -n1 kubectl delete

Finally, delete the Fission namespace and the install-time CRD kustomization, if you no longer need them:

kubectl delete namespace fission
kubectl delete -k "github.com/fission/fission/crds/v1?ref=v1.27.0"

If you enabled Internal Service Authentication, helm uninstall removes the chart-managed Secret/fission-internal-auth along with the rest of the release. No manual cleanup is needed for it.

Last modified July 18, 2026: docs: Tufte clarity pass across architecture, install, concepts, reference (#312) (ab88177)