1.安装前，准备三台CENTOS 6.6系统的主机或虚机,并且关闭防火墙及selinux.

2.按如下表格配置IP地址，修改hosts文件及本机名

192.168.199.21 hadoop21  Master

102.168.199.22 hadoop22  Slave1

192.168.199.23 hadoop23  Slave2

同理修改Slave1，Slave2的IP地址，hosts文件及本机名。

3.安装ORACLE JDK

先卸载本机openJDK,使用rpm -qa|grep java查看，然后用rpm -e 卸载

从oracle网站找到最新JDK,我这选择了JDK8

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

下载好以后解压，并移至/usr/java,如果没有可以mkdir 建立。

tar -xzvf jdk-8u51-linux-x64.gz

mv jdk1.8.0_51 /usr/java

 vi /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_51

export CLASSPATH=.:$JAVA_HOME/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

4.在各节点分别建立Hadoop运行帐号grid,并设置密码

5.配置SSH免密码登陆。

在各节点分别以grid用户名生成两个密钥文件，一个是私钥id_rsa,另一个是公钥id_rsa.pub

ssh-keygen -t rsa -f ~/.ssh/id_rsa

然后在hadoop21上

cp /home/grid/.ssh/id_rsa.pub /home/grid/.ssh/authorized_keys

scp hadoop22:/home/grid/.ssh/id_rsa.pub pubkeys22

scp hadoop23:/home/grid/.ssh/id_rsa.pub pubkeys23

cat pubkeys22 >>  /home/grid/.ssh/authorized_keys

cat pubkeys23 >>  /home/grid/.ssh/authorized_keys

rm pubkeys22

rm pubkeys23

最后分发authorized_keys 到各节点

scp /home/grid/.ssh/authorized_keys hadoop22:/home/grid/.ssh

scp /home/grid/.ssh/authorized_keys hadoop23:/home/grid/.ssh

6.在Master机下载并解压Hadoop2.7.1（使用grid用户名)

找到最近的hadoop镜像，使用wget下载2.7.1

wget http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-2.7.1/hadoop-2.7.1.tar.gz

解压hadoop-2.7.1.tar.gz

tar -xzvf hadoop-2.7.1.tar.gz

cd hadoop-2.7.1

建立tmp,dfs,dfs/data,dfs/name

7.修改配置文件

修改hadoop-env.sh

export JAVA_HOME=/usr/java/jdk1.8.0_51

8. 分发至各Salve节点

scp -r /home/grid/hadoop-2.7.1 hadoop22:/home/grid

scp -r /home/grid/hadoop-2.7.1 hadoop23:/home/grid

9.Master机格式化namenode

cd /home/grid/hadoop-2.7.1

./bin/hdfs namenode -format

10.启动Hadoop

11.验证是否成功

Master机应该启动NameNode,SecondaryNameNode,ResourceManager

Slave机应该启动DataNode,NodeManager

     本文转自yzy121403725 51CTO博客，原文链接：http://blog.51cto.com/lookingdream/1835082，如需转载请自行联系原作者