伪分布式环境搭建http://mvplee.iteye.com/blog/2212629
复制之前在VirutalBox搭建的伪分布式环境，修改主机名，分别为hadoop1、hadoop2、hadoop3
修改每台主机的主机名，分别为hadoop1、hadoop2、hadoop3
/etc/sysconfig/network /etc/hosts reboot
修改hadoop1主机的配置文件
core-site.xml mapred-site.xml
配置每台主机的ssh
[root@hadoop03 local]# ssh-keygen -t rsa [root@hadoop03 local]# cd /root/.ssh [root@hadoop03 .ssh]# cat id_rsa.pub >>authorized_keys
在hadoop2、hadoop3上复制自己的公钥到hadoop1上，hadoop1、hadoop2都可以免密码登录hadoop1
[root@hadoop2 .ssh]# ssh-copy-id id hadoop0 [root@hadoop03 .ssh]# ssh-copy-id -i hadoop1 [root@hadoop1 .ssh]# more authorized_keys
复制hadoop1中的authoried_keys到hadoop2、hadoop3上，确保三台主机上的authorized_keys内容一样都可以互相面密码登录
[root@hadoop1 .ssh]# scp /root/.ssh/authorized_keys hadoop2:/root/.ssh/ [root@hadoop1 .ssh]# scp /root/.ssh/authorized_keys hadoop3:/root/.ssh/
删除hadoop1上hadoop包中的logs、tmp目录
[root@hadoop1 hadoop-1.1.2]# rm -rf logs [root@hadoop1 hadoop-1.1.2]# rm -rf tmp
在hadoop1上复制JDK目录和hadoop目录到hadoop1、hadoop2上
[root@hadoop1 local]# scp -r /usr/local/jdk1.6.0_24 hadoop2:/usr/local/jdk1.6.0_24 [root@hadoop1 local]# scp -r /usr/local/jdk1.6.0_24 hadoop3:/usr/local/jdk1.6.0_24 [root@hadoop1 local]# scp -r /usr/local/hadoop-1.1.2 hadoop2:/usr/local/hadoop-1.1.2 [root@hadoop1 local]# scp -r /usr/local/hadoop-1.1.2 hadoop3:/usr/local/hadoop-1.1.2
在hadoop1上复制profile到hadoop2、hadoop3上，重新加载资源文件
[root@hadoop1 local]# scp /etc/profile hadoop2:/etc/ [root@hadoop1 local]# scp /etc/profile hadoop3:/etc/ [root@hadoop2 local]# source /etc/profile [root@hadoop3 local]# source /etc/profile
配置hadoop主从节点，在hadoop1主机上的slaves文件中加入hadoop2、hadoop3为从节点，masters上存放的是SecondarNameNode
[root@hadoop1 local]# more hadoop-1.1.2/conf/slaves #localhost hadoop2 hadoop3
在hadoop1上格式namenode，启动hadoop
[root@hadoop1 local]# hadoop namenode -format [root@hadoop1 local]# jps 5740 JobTracker 5659 SecondaryNameNode 5492 NameNode 5839 Jps [root@hadoop2 local]# jps 3473 TaskTracker 3568 Jps 3365 DataNode [root@hadoop3 local]# jps 2233 TaskTracker 2310 Jps 2142 DataNode
使用浏览器登录http://192.168.56.21:50070/
分布式搭建完成