前言：
在这篇文章中https://www.jianshu.com/p/eeae2f37a48c
我们使用的是root用户来部署的，在生产环境中，一般某个组件是由某个用户来启动的，本篇文章介绍下怎样用hadoop用户来重新部署伪分布式(HDFS)

1.前期准备

创建hadoop用户，及配置ssh免密登录
参考：https://www.jianshu.com/p/589bb43e0282

2.停止root启动的HDFS进程并删除/tmp目录下的存储文件

[root@hadoop000 hadoop-2.8.1]# pwd
/opt/software/hadoop-2.8.1
[root@hadoop000 hadoop-2.8.1]# jps
32244 NameNode
32350 DataNode
32558 SecondaryNameNode
1791 Jps
[root@hadoop000 hadoop-2.8.1]# sbin/stop-dfs.sh 
Stopping namenodes on [hadoop000]
hadoop000: stopping namenode
localhost: stopping datanode
Stopping secondary namenodes [0.0.0.0]
0.0.0.0: stopping secondarynamenode
[root@hadoop000 hadoop-2.8.1]# jps
2288 Jps
[root@hadoop000  hadoop-2.8.1]# rm -rf /tmp/hadoop-* /tmp/hsperfdata_*

3.更改文件属主

[root@hadoop000 software]# pwd
/opt/software
[root@hadoop000 software]# chown -R hadoop:hadoop hadoop-2.8.1

4.进入hadoop用户 修改相关配置文件

#第一步:
[hadoop@hadoop000 hadoop]$ pwd
/opt/software/hadoop-2.8.1/etc/hadoop
[hadoop@hadoop000 hadoop]$ vi hdfs-site.xml 
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>192.168.6.217:50090</value>
</property>
<property>
<name>dfs.namenode.secondary.https-address</name>
<value>192.168.6.217:50091</value>
</property>
</configuration>
#第二步：
[hadoop@hadoop000 hadoop]$ vi core-site.xml 
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://192.168.6.217:9000</value>
</property>
</configuration>
#第三步：
[hadoop@hadoop000 hadoop]# vi slaves 
192.168.6.217

5.格式化和启动

[hadoop@hadoop000 hadoop-2.8.1]$ pwd
/opt/software/hadoop-2.8.1
[hadoop@hadoop000 hadoop-2.8.1]$ bin/hdfs namenode -format
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.sh
Starting namenodes on [hadoop000]
hadoop000: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop000.out
192.168.6.217: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop000.out
Starting secondary namenodes [hadoop000]
hadoop000: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop000.out
[hadoop@hadoop000 hadoop-2.8.1]$ jps
3141 Jps
2806 DataNode
2665 NameNode
2990 SecondaryNameNode
#至此发现HDFS三个进程都是以hadoop000启动，

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