1.修改hdfs-site.xml
修改配置如下，并复制到集群的其他机器中
<configuration>
<!--副本的份数-->
<property>
<name>dfs.replication</name>
<value>3</value>
<description>replication num</description>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/root/hadoop/dfs/nn/name</value>
<description>name location</description>
</property>
<property>
<name>dfs.namenode.edits.dir</name>
<value>file:/root/hadoop/dfs/nn/edits</value>
<description>edit file location</description>
</property>
<property>
<name>dfs.namenode.checkpoint.dir</name>
<value>file:/root/hadoop/dfs/snn/name</value>
<description>seconde name file location</description>
</property>
<property>
<name>dfs.namenode.checkpoint.edits.dir</name>
<value>file:/root/hadoop/dfs/snn/edits</value>
<description>seconde edit file location</description>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:/root/hadoop/dfs/dn/data</value>
<description>data location</description>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
<!-- nameNode1,namenode2 -->
<property>
<name>dfs.nameservices</name>
<value>ns1,ns2</value>
</property>
<!-- namenode1 config -->
<property>
<name>dfs.namenode.rpc-address.ns1</name>
<value>h2m1:8020</value>
</property>
<property>
<name>dfs.namenode.servicerpc-address.ns1</name>
<value>h2m1:8021</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address.ns1</name>
<value>h2m1:9001</value>
<description>secondary namenode web config</description>
</property>
<property>
<name>dfs.namenode.secondary.https-address.ns1</name>
<value>h2m1:9002</value>
<description>secondary namenode web config</description>
</property>
<!-- namenode2 config -->
<property>
<name>dfs.namenode.rpc-address.ns2</name>
<value>h2s1:8020</value>
</property>
<property>
<name>dfs.namenode.servicerpc-address.ns2</name>
<value>h2s1:8021</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address.ns2</name>
<value>h2s1:9001</value>
<description>secondary namenode web config</description>
</property>
<property>
<name>dfs.namenode.secondary.https-address.ns2</name>
<value>h2s1:9002</value>
<description>secondary namenode web config</description>
</property>
</configuration>
2. 修改core-site.xml
作为NameNode faderation的节点修改如下的配置将h2m1修改为自定主机名或ip
<property>
<name>fs.defaultFS</name>
<value>hdfs://h2m1:9000</value>
</property>
3. 删除logs、dfs目录
rm -rf /root/hadoop/dfs/ ### 自定义的dfs位置
rm -rf /usr/local/hadoop271/logs/
4. 格式化NameNode faderation节点，每个都需要执行命令
hdfs namenode -format -clusterId clusterCustomId clusterCustomId为指定的id，faderation节点必须相同，否则不会加入faderation集群
5.启动hdfs
start-dfs.sh
