添加健康检查

tke/zookeeper3.4/Dockerfile

-FROM zookeeper:3.4
+FROM zookeeper:3.4.13
 
+COPY readyCheck.sh .

tke/zookeeper3.4/readyCheck.sh

+#!/usr/bin/env bash
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# zkOk.sh uses the ruok ZooKeeper four letter work to determine if the instance
+# is health. The $? variable will be set to 0 if server responds that it is
+# healthy, or 1 if the server fails to respond.
+ZK_CLIENT_PORT=${ZK_CLIENT_PORT:-2181}
+OK=$(echo ruok | nc 127.0.0.1 $ZK_CLIENT_PORT)
+if [ "$OK" == "imok" ]; then
+	exit 0
+else
+	exit 1
+fi
+
+