实验前提：
保证 ssh localhost 不需要输入密码

切换工作目录

[root@hadoop hadoop-2.7.4]# pwd
/usr/hadoop/hadoop-2.7.4

etc/hadoop/core-site.xml:

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

etc/hadoop/hdfs-site.xml:

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>

格式化文件系统

[root@hadoop hadoop-2.7.4]# bin/hdfs namenode -format

Start NameNode daemon and DataNode daemon:

sbin/start-dfs.sh

验证结果

[root@hadoop hadoop-2.7.4]# /usr/jdk64/jdk1.8.0_144/bin/jps 
11204 Jps
10902 DataNode
10776 NameNode
11064 SecondaryNameNode

访问namenode web接口

http://NAMENODE-IP:50070/