require prefix rule

Apply Constraint Template and Constraint

± kubectl apply -f gatekeeper/require-prefix/k8srequiredprefix.yaml
constrainttemplate.templates.gatekeeper.sh/k8srequiredprefixes created

± kubectl apply -f gatekeeper/require-prefix/k8srequiredprefix-ns.yaml
k8srequiredprefixes.constraints.gatekeeper.sh/ns-must-start-with-prefix created

Check

± kubectl create ns ns-naka
Error from server ([denied by ns-must-start-with-prefix] you must provide prefix: dev, provided: ns-naka): admission webhook "validation.gatekeeper.sh" denied the request: [denied by ns-must-start-with-prefix] you must provide prefix: dev, provided: ns-naka

± kubectl create ns dev-naka
namespace/dev-naka created

Clean up

± kubectl delete ns dev-naka
namespace "dev-naka" deleted

± kubectl delete -f gatekeeper/require-prefix/k8srequiredprefix-ns.yaml
k8srequiredprefixes.constraints.gatekeeper.sh "ns-must-start-with-prefix" deleted

± kubectl delete -f gatekeeper/require-prefix/k8srequiredprefix.yaml
constrainttemplate.templates.gatekeeper.sh "k8srequiredprefixes" deleted