The Deployment "flagger" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"flagger", "app.kubernetes.io/instance":"flagger", "app.kubernetes.io/name":"flagger"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable

[zzguang520]

have error when install Flagger using Kustomize reference: https://docs.flagger.app/tutorials/istio-progressive-delivery

[root@~]# kubectl apply -k github.com/weaveworks/flagger//kustomize/istio
customresourcedefinition.apiextensions.k8s.io/alertproviders.flagger.app unchanged
customresourcedefinition.apiextensions.k8s.io/canaries.flagger.app unchanged
customresourcedefinition.apiextensions.k8s.io/metrictemplates.flagger.app unchanged
serviceaccount/flagger unchanged
clusterrole.rbac.authorization.k8s.io/flagger unchanged
clusterrolebinding.rbac.authorization.k8s.io/flagger unchanged
Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
The Deployment "flagger" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"flagger", "app.kubernetes.io/instance":"flagger", "app.kubernetes.io/name":"flagger"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable

[stefanprodan]

Delete the old deployment are rerun the kubectl command