完全分布式搭建

修改ip地址和主机名

修改3台虚拟机的ip地址和主机名
vim /etc/sysconfig/network-scripts/ifcfg-ens33
将IPADDR修改为
192.168.200.81
重新启动网络服务使其生效
systemctl restart network

集群规划

组件	node1	node2	node3
HDFS	NameNode,DataNode	DataNode	SecondaryNameNode,DataNode
YARN	NodeManager	ResourceManager	NodeManager

以下操作均只是修改node1

修改配置文件

hadoop-env.sh

修改配置：
export JAVA_HOME=/opt/app/jdk1.8.0_321
export HADOOP_CONF_DIR=/opt/app/hadoop-2.8.5/etc/hadoop

core-site.xml

<configuration>
<!--在configuration标签中增加如下配置-->
<!-- 指定HDFS中NameNode的地址 -->
<property>
  <name>fs.defaultFS</name>
  <value>hdfs://node1:9000</value>
</property>
<!-- 指定hadoop运行时产生文件的存储目录  HDFS相关文件存放地址-->
<property>
  <name>hadoop.tmp.dir</name>
  <value>/opt/app/hadoop-2.8.5/metaData</value>
</property>
</configuration>

hdfs-site.xml

  <configuration>    
      <property>
          <name>dfs.replication</name>
          <value>3</value>
      </property>
      <!--secondary namenode地址-->
      <property>
          <name>dfs.namenode.secondary.http-address</name>
          <value>node3:50090</value>
      </property>
      <!--hdfs取消用户权限校验-->
       <property>
          <name>dfs.permissions.enabled</name>
          <value>false</value>
      </property>
  </configuration>

slaves

node1
node2
node3

yarn-env.sh

export JAVA_HOME=/opt/app/jdk1.8.0_321

yarn-site.xml

<configuration>
  <!-- reducer获取数据的方式 -->
  <property>
  <name>yarn.nodemanager.aux-services</name>
  <value>mapreduce_shuffle</value>
  </property>

  <!-- 指定YARN的ResourceManager的地址 -->
  <property>
  <name>yarn.resourcemanager.hostname</name>
  <value>node2</value>
  </property>
  <property>
      <name>yarn.application.classpath</name>
      <value>
      /opt/app/hadoop-2.8.5/etc/hadoop,
      /opt/app/hadoop-2.8.5/share/hadoop/common/*,
      /opt/app/hadoop-2.8.5/share/hadoop/common/lib/*,
      /opt/app/hadoop-2.8.5/share/hadoop/hdfs/*,
      /opt/app/hadoop-2.8.5/share/hadoop/hdfs/lib/*,
      /opt/app/hadoop-2.8.5/share/hadoop/mapreduce/*,
      /opt/app/hadoop-2.8.5/share/hadoop/mapreduce/lib/*,
      /opt/app/hadoop-2.8.5/share/hadoop/yarn/*,
      /opt/app/hadoop-2.8.5/share/hadoop/yarn/lib/*
      </value>
  </property>
</configuration>

mapred-env.sh

修改配置：
export JAVA_HOME=/opt/app/jdk1.8.0_321

mapred-site.xml

<configuration>
  <property>
      <name>mapreduce.framework.name</name>
      <value>yarn</value>
  </property>
</configuration>

拷贝到别的节点上

scp -r 本机的目录 root@node1:/opt/app

scp -r /opt/app/hadoop-2.8.5 root@node2:/opt/app/
scp -r /opt/app/hadoop-2.8.5 root@node3:/opt/app/

只格式化node1上的namenode

hdfs namenode -format

注意：yarn最好在所在节点上启动