Hadoop伪分布式集群搭建

软件准备

我使用的是CentOS-6.6的虚拟机，主机名为repo。参考在Windows中安装Linux虚拟机的步骤，我在该虚拟机中安装了JDK，参考在Linux中安装JDK的指南。此外，该虚拟机配置了免秘钥登录自身，参考配置各台虚拟机之间免秘钥登录的设置。Hadoop安装包的下载地址为：https://www.php.cn/link/eecd2755d73701aa057cd2a32bd7b1e2。

1. 将Hadoop安装包上传到服务器并解压

   [root@repo ~]# tar zxvf hadoop-2.6.5.tar.gz -C /opt/apps/

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2. 配置环境变量

   # 可以直接定位到文件的最后一行
   [root@repo hadoop-2.6.5]# vi + /etc/profile
   export HADOOP_HOME=/opt/apps/hadoop-2.6.5
   export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
   [root@repo hadoop-2.6.5]# . /etc/profile

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3. 修改 hadoop-env.sh、mapred-env.sh、yarn-env.sh 这三个配置文件，添加JAVA_HOME

   [root@repo hadoop]# pwd
   /opt/apps/hadoop-2.6.5/etc/hadoop
   [root@repo hadoop]# vi hadoop-env.sh
   export JAVA_HOME=/usr/local/jdk1.8.0_73
   [root@repo hadoop]# vi mapred-env.sh
   export JAVA_HOME=/usr/local/jdk1.8.0_73
   [root@repo hadoop]# vi yarn-env.sh
   export JAVA_HOME=/usr/local/jdk1.8.0_73

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4. 修改 core-site.xml 和 hdfs-site.xml 配置文件，配置伪分布式相关的内容

   [root@repo hadoop]# vi core-site.xml
   <configuration>
   <property>
    <name>fs.defaultFS</name>
    <value>hdfs://repo:9000</value>
   </property>
   <property>
    <name>hadoop.tmp.dir</name>
    <value>/var/hadoop/pseudo</value>
   </property>
   </configuration>
   [root@repo hadoop]# vi hdfs-site.xml
   <configuration>
   <property>
    <name>dfs.replication</name>
    <value>1</value>
   </property>
   <property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>repo:50090</value>
   </property>
   </configuration>

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5. 修改 slaves 配置文件，指定DataNode所在的节点

   [root@repo hadoop]# vi slaves
   repo

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6. 格式化文件系统

   [root@repo hadoop]# hadoop namenode --format
   # 成功信息
   17/09/16 21:17:11 INFO common.Storage: Storage directory /var/hadoop/pseudo/dfs/name has been successfully formatted.

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7. 启动HDFS和YARN

   [root@repo hadoop]# start-dfs.sh
   Starting namenodes on [repo]
   repo: starting namenode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-namenode-repo.out
   repo: starting datanode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-datanode-repo.out
   Starting secondary namenodes [repo]
   repo: starting secondarynamenode, logging to /opt/apps/hadoop-2.6.5/logs/hadoop-root-secondarynamenode-repo.out
   [root@repo hadoop]# start-yarn.sh
   starting yarn daemons
   starting resourcemanager, logging to /opt/hadoop-2.7.4/logs/yarn-root-resourcemanager-repo.out
   repo: starting nodemanager, logging to /opt/hadoop-2.7.4/logs/yarn-root-nodemanager-repo.out
   [root@repo hadoop]# jps
   4368 Jps
   3957 ResourceManager
   3512 NameNode
   3641 DataNode
   4058 NodeManager
   3805 SecondaryNameNode

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8. 访问WEB页面 搭建成功！

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