Hadoop HDFS 单节点部署方案

初学者，再次记录一下。

确保Java 和 Hadoop已安装完毕(每个人的不一定一样，但肯定都有数据，仅供参考)

[root@jans hadoop-2.9.0]# pwd
/usr/local/hadoop-2.9.0
[root@jans hadoop-2.9.0]# echo $JAVA_HOME
/usr/
[root@jans hadoop-2.9.0]# java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)
[root@jans hadoop-2.9.0]# echo $HADOOP_HOME
/usr/local/hadoop-2.9.0
[root@jans hadoop-2.9.0]# ./bin/hadoop version
Hadoop 2.9.0
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r 756ebc8394e473ac25feac05fa493f6d612e6c50
Compiled by arsuresh on 2017-11-13T23:15Z
Compiled with protoc 2.5.0
From source with checksum 0a76a9a32a5257331741f8d5932f183
This command was run using /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar

Java and Hadoop 安装状态查看

hadoop根目录：

　　/usr/local/hadoop-2.9.0/

确保当前工作目录处于Hadoop根目录

1：编辑配置文件
编辑文件：/usr/local/hadoop-2.9.0/etc/hadoop/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>
    <property>
      <name>hadoop.tmp.dir</name>
      <value>file:/home/hadoop/tmp</value>
      <description>Abase for other temporary directories.</description>
    </property>
    <property>
      <name>fs.defaultFS</name>
      <value>hdfs://localhost:9000</value>
    </property>
</configuration>

编辑文件：/usr/local/hadoop-2.9.0/etc/hadoop/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>
    <property>
      <name>dfs.replication</name>
      <value>1</value>
    </property>
    <property>
      <name>dfs.namenode.name.dir</name>
      <value>file:/home/hadoop/tmp/dfs/name</value>
    </property>
    <property>
      <name>dfs.datanode.data.dir</name>
      <value>file:/home/hadoop/tmp/dfs/data</value>
    </property> 

</configuration>

2：格式化节点

./bin/hadoop namenode -format

3：启动服务

 ./sbin/start-all.sh 

此操作会启动两个服务：

　　This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh

4：状态查看

http://{IP address}:50070 查看概况

http://{IP address}:50075 查看Node Status

http://{IP address}:8088 查看Hadoop 集群状态

如果看不到数据则部署失败

其他端口查看