修改namenode上的hdfs-site.xml

configuration>
  <property>
    <name>dfs.replication</name>
    <value>2</value>
  </property>
  <property>
   <name>dfs.http.address</name>
   <value>www.node1.com:50070</value>
  </property>
  <property
 
>
   <name>dfs.secondary.http.address</name>
   <value>www.node2.com:50090</value>
  </property>
</configuration

啟動之後各個節點上進程：

【大數據系列】在hadoop2.8.0下配置SecondaryNameNode