Hadoop20140314-（1）

1、今天安装了虚拟机，安装了ubuntu12.04（64位）

2、更改源

（1）sudo gedit /etc/apt/sources.list

（2）使用以下内容替换原来的内容，下面是搜狐的源

deb http://mirrors.sohu.com/ubuntu/ precise main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricteddeb http://mirrors.sohu.com/ubuntu/ precise universedeb-src http://mirrors.sohu.com/ubuntu/ precise universedeb http://mirrors.sohu.com/ubuntu/ precise-updates universedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates universedeb http://mirrors.sohu.com/ubuntu/ precise multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise multiversedeb http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiversedeb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiversedeb http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb-src http://mirrors.sohu.com/ubuntu/ precise-security main restricteddeb http://mirrors.sohu.com/ubuntu/ precise-security universedeb-src http://mirrors.sohu.com/ubuntu/ precise-security universedeb http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb-src http://mirrors.sohu.com/ubuntu/ precise-security multiversedeb http://extras.ubuntu.com/ubuntu precise maindeb-src http://extras.ubuntu.com/ubuntu precise main

（3）更新源 sudo apt-get update

3、安装jdk  

（1）oracle官网下载jdk-7u51-linux-x64.tar.gz 

（2）解压到具体的文件夹

（3）将jdk拷贝到/usr/lib/jvm中  sudo cp -r   jdk1.7.0_51/   /usr/lib/jvm/

说明：jdk1.7.0_51/表示jdk的绝对位置或相对位置，相对位置由当前所处的位置决定

（4）修改环境变量sudo gedit /etc/environment

在PATH中添加:/usr/lib/jvm/java/jdk1.7.0_51/bin

另外添加如下两条：
CLASSPATH=.:/usr/lib/jvm/java/jdk1.7.0_51/lib
JAVA_HOME=/usr/lib/jvm/java/jdk1.7.0_51

添加后保存退出，然后敲入命令 source ~/.bashrc

（5）配置默认的JDK

sudo       update-alternatives    --install     /usr/bin/java      java      /usr/lib/jvm/jdk1.7.0_51/bin/java 300  
sudo       update-alternatives    --install     /usr/bin/javac    javac    /usr/lib/jvm/jdk1.7.0_51/bin/javac 300  
sudo       update-alternatives    --install     /usr/bin/jar         jar         /usr/lib/jvm/jdk1.7.0_51/bin/jar 300

检查sudo update-alternatives --config java  

（6）查看jdk版本

java       -version

root@ubuntu:/usr/lib/jvm# java -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)