• 版本：CentOS-6.8-x86_64-minimal，hadoop2.6.4，jdk1.7.0
• 首先把jdk、hadoop壓縮包下載發送到CentOS下並解壓

下載發送不多贅述，解壓命令tar -zxvf 壓縮包

mv 原文件名 新文件名

（註意空格）

• 先配置jdk

1. 進入jdk目錄 pwd 查看當前目錄復制備用/apps/jdk1.7.0_25
2. 配置環境變量

vi ~/.bash_profile

JAVA_HOME=/apps/jdk1.7.0_25
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

source ~/.bash_profile

• 關閉防火墻，做好ssh免密登錄
  • 關閉防火墻
    • service iptables stop
    • chkconfig iptables off
    • ssh-keygen -t rsa
  • ssh免密登錄
    • master： cat /root/.ssh/id_rsa.pub >>/root/.ssh/authorized_keys
    • master：scp /root/.ssh/authorized_keys @slave1:/root/.ssh/authorized_keys
    • slave1：cat /root/.ssh/id_rsa.pub >>/root/.ssh/authorized_keys
    • slave1：scp /root/.ssh/authorized_keys @slave2:/root/.ssh/authorized_keys
    • slave2：cat /root/.ssh/id_rsa.pub >>/root/.ssh/authorized_keys
    • slave2：scp /root/.ssh/authorized_keys @master:/root/.ssh/authorized_keys
    • master：scp /root/.ssh/authorized_keys @slave1:/root/.ssh/authorized_keys
    • slave2：scp /root/.ssh/authorized_keys @slave2:/root/.ssh/authorized_keys
• 再配置hadoop

1. 環境變量vi ~/.bash_profile

   HADOOP_HOME=/apps/hadoop-2.6.4
   PATH=$PATH:$HOME/bin:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

   source ~/.bash_profile

2. 配置運行環境
   • core-site.xml

     • <property>
       <name>fs.defaultFS</name>
       <value>hdfs://master:9000</value>
       </property>

   • hdfs-site.xml

     • 
       <property>
       <name>dfs.replication</name>
       <value>3</value>
       </property>

       <property>
       <name>dfs.namenode.name.dir</name>
       <value>/app/hadoop/dfs/name</value>
       </property>

       <property>
       <name>dfs.datanode.data.dir</name>
       <value>/app/hadoop/dfs/data</value>
       </property>

       <property>
       <name>dfs.secondary.http.address</name>
       <value>slave2:50090</value>
       </property>

       <property>
       <name>dfs.namenode.checkpoint.dir</name>
       <value>/app/hadoop/dfs/namesecondary</value>
       </property>

   • hadoop-env.sh
     • export JAVA_HOME=/apps/jdk1.7.0_25
   • yarn-site.xml

     • <property>
       <name>yarn.nodemanager.aux-services</name>
       <value>mapreduce_shuffle</value>
       </property>

       <property>
       <name>yarn.resourcemanager.hostname</name>
       <value>master</value>
       </property>

       
       mapreduce-site.xml
       <property>
       <name>mapreduce.framework.name</name>
       <value>yarn</value>
       </property>

3. 將配置完成的jdk、hadoop發送到另外兩臺主機上
   • master：scp -r apps/ @slave1:/apps/
   • master：scp -r apps/ @slave2:/apps/

　　hadoop集群配置完成

hadoop在CentOS下的安裝配置