Ubuntu 创建本地 Hadoop 集群

#下载 http://hadoop.apache.org/releases.html
wget http://mirror.metrocast.net/apache/hadoop/common/hadoop-1.2.1/hadoop-1.2.1.tar.gz
#http://7xr12m.dl1.z0.glb.clouddn.com/hadoop-1.2.1.tar.gz

sudo  tar -xvf hadoop-1.2.1.tar.gz
export  HADOOP_HOME=/root/hadoop-1.2.1
export  PATH=/root/hadoop-1.2.1/bin:${PATH}
#在/etc/profile中添加对所有用户永久生效

cd hadoop-1.2.1/conf/
vim hadoop-env.sh
#去掉JAVA_HOME前面的注释,并修改值

#配置SSH免密码登录
#下载SSH

ssh-keygen
sudo  cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
ssh localhost
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