前言

本节内容延续前面几节内容，综合性的实现hadoop集群的高可用以及hadoop集群故障初始化的恢复，通过一个脚本，实现整个集群的高可用启停与状态观测。主要是zookeeper、hdfs、yarn等服务的高可用集群的一键式启停。

正文

• hadoop高可用集群整体规划

hadoop高可用集群服务规划

hadoop101	hadoop102	hadoop103
NameNode	NameNode	NameNode
JournalNode	JournalNode	JournalNode
DataNode	DataNode	DataNode
Zookeeper	Zookeeper	Zookeeper
ZKFC	ZKFC	ZKFC
ResourceManager	ResourceManager	ResourceManager
NodeManager	NodeManager	NodeManager

• hadoop高可用相关配置文件分发

- core-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  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. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->
<configuration>


    <!-- 把多个 NameNode 的地址组装成一个集群 mycluster -->
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://mycluster</value>
    </property>

    <!-- 指定hadoop数据的存储目录 -->
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/opt/module/hadoop-3.1.3/data</value>
    </property>

    <!-- 配置HDFS网页登录使用的静态用户为hadoop -->
    <property>
        <name>hadoop.http.staticuser.user</name>
        <value>hadoop</value>
    </property>

    <!-- 指定 zkfc 要连接的 zkServer 地址 -->
    <property>
        <name>ha.zookeeper.quorum</name>
        <value>hadoop101:2181,hadoop102:2181,hadoop103:2181</value>
    </property>
</configuration>

- hdfs-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  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. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->
<configuration>
    <!-- NameNode 数据存储目录 -->
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file://${hadoop.tmp.dir}/nn</value>
    </property>
    <!-- DataNode 数据