Remove Rancher from Cluster - Force Delete CRDs

script.sh

# Manually remove finalizers

kubectl edit -n cattle-system secret tls-rancher
kubectl patch secret tls-rancher -p '{"metadata":{"finalizers":[]}}' --type='merge' -n cattle-system

kubectl patch namespace cattle-system -p '{"metadata":{"finalizers":[]}}' --type='merge' -n cattle-system
kubectl delete namespace cattle-system --grace-period=0 --force

kubectl patch namespace cattle-global-data -p '{"metadata":{"finalizers":[]}}' --type='merge' -n cattle-system
kubectl delete namespace cattle-global-data --grace-period=0 --force

kubectl patch namespace local -p '{"metadata":{"finalizers":[]}}' --type='merge' -n cattle-system

kubectl get customresourcedefinitions |grep cattle.io |awk '{print $1}' |xargs kubectl patch -p '{"metadata":{"finalizers":[]}}' --type=merge crd

# Delete CRDs
kubectl get customresourcedefinitions |grep cattle.io |awk '{print $1}' |xargs kubectl delete customresourcedefinitions --force --grace-period=0

kubectl delete namespace local --grace-period=0 --force

Better use this solution.