Migrate Kubernetes v1.9.1 cluster/addons/registry to Kubespray

roles/kubernetes-apps/registry/files/images/rootfs/bin/boot

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# fail if no hostname is provided
+REGISTRY_HOST=${REGISTRY_HOST:?no host}
+REGISTRY_PORT=${REGISTRY_PORT:-5000}
+
+# we are always listening on port 80
+# https://github.com/nginxinc/docker-nginx/blob/43c112100750cbd1e9f2160324c64988e7920ac9/stable/jessie/Dockerfile#L25
+PORT=80
+
+sed -e "s/%HOST%/$REGISTRY_HOST/g" \
+	-e "s/%PORT%/$REGISTRY_PORT/g" \
+	-e "s/%BIND_PORT%/$PORT/g" \
+	</etc/nginx/conf.d/default.conf.in >/etc/nginx/conf.d/default.conf
+
+# wait for registry to come online
+while ! curl -sS "$REGISTRY_HOST:$REGISTRY_PORT" &>/dev/null; do
+	printf "waiting for the registry (%s:%s) to come online...\n" "$REGISTRY_HOST" "$REGISTRY_PORT"
+	sleep 1
+done
+
+printf "starting proxy...\n"
+exec nginx -g "daemon off;" "$@"