安装jdk
<!--[if !supportLists]-->1.
<!--[endif]-->下载
wget http://download.oracle.com/otn-pub/java/jdk/6u31-b04/jdk-6u31-linux-i586.bin
<!--[if !supportLists]-->2.
<!--[endif]-->把jdk移到/usr/local/目录下
naxsu@ubuntu:~$
sudo mv jdk-6u31-linux-i586.bin /usr/local/
[sudo] password for naxsu:
<!--[if !supportLists]-->3.
<!--[endif]-->安装
naxsu@ubuntu:/usr/local$
./jdk-6u31-linux-i586.bin
-bash: ./jdk-6u31-linux-i586.bin:
Permission denied
提示没权限
方法一：在前面加上sudo sh
root@ubuntu:/usr/java#sudo
sh ./ jdk-6u31-linux-i586.bin
方法二：加权限
root@ubuntu:/usr/java#
sudo chmod u+x jdk-6u31-linux-i586.bin
root@ubuntu:/usr/java#
./ jdk-6u31-linux-i586.bin
naxsu@ubuntu:/usr/local$
sudo chmod u+x jdk-6u31-linux-i586.bin
naxsu@ubuntu:/usr/local$
sudo ./jdk-6u31-linux-i586.bin
出问题了，如下：
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naxsu@ubuntu:/usr/local$ sudo
./jdk-6u31-linux-i586.bin
./jdk-6u31-linux-i586.bin: 1:
./jdk-6u31-linux-i586.bin: cannot open html: No such file
./jdk-6u31-linux-i586.bin: 2:
./jdk-6u31-linux-i586.bin: cannot open head: No such file
./jdk-6u31-linux-i586.bin: 3:
./jdk-6u31-linux-i586.bin: cannot open title: No such file
./jdk-6u31-linux-i586.bin: 3:
./jdk-6u31-linux-i586.bin: Request: not found
./jdk-6u31-linux-i586.bin: 4:
./jdk-6u31-linux-i586.bin: cannot open META: No such file
./jdk-6u31-linux-i586.bin: 5:
./jdk-6u31-linux-i586.bin: cannot open link: No such file
./jdk-6u31-linux-i586.bin: 6:
./jdk-6u31-linux-i586.bin: cannot open link: No such file
: not foundlinux-i586.bin: 7:
./jdk-6u31-linux-i586.bin:
./jdk-6u31-linux-i586.bin: 8:
./jdk-6u31-linux-i586.bin: cannot open body: No such file
./jdk-6u31-linux-i586.bin: 9:
./jdk-6u31-linux-i586.bin: cannot open div: No such file
./jdk-6u31-linux-i586.bin: 10:
./jdk-6u31-linux-i586.bin: cannot open table: No such file
./jdk-6u31-linux-i586.bin: 11:
./jdk-6u31-linux-i586.bin: cannot open tr: No such file
./jdk-6u31-linux-i586.bin: 12:
./jdk-6u31-linux-i586.bin: Syntax error: redirection unexpected
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用vi编辑器打开，竟是一个网页。
只能到官网下载JDK了
用VMware
Workstation虚拟机来识别USB设备(如U盘)的方法
首先，要使VM虚拟机能够识别USB设备，也就像Windows中的找到新硬件提示一样，打开虚拟机，运行后，插入USB设备（该设备已被Windows识别），然后按照图示方式选择Removable Devices,选择USB Device，然后在VM的右下角会出现USB设备图标，证明已经被VM识别出来了。
其次，因为在Linux系统中要读取U盘设备，必须通过文件挂载的方式来访问，即把USB设备也当成文件来访问，要挂载设备，首先要知道其设备名，然后在利用挂载命令挂载，可以用fdisk –l或者dmesg命令获得USB设备的设备名假设为sdb1，然后新建一个文件夹目录比如mkdir myusb ,再利用mount –t –vfat 设备名
挂载目录命令挂载，这里可使用mount –t –vfat sdb1 myusb，然后就可以通过myusb目录访问USB设备上的内容。
最后，使用完毕之后要卸载USB，可以使用unmount挂载目录，或者unmount
设备名，即可使用unmount myusb或者unmount sdb1来卸载。
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naxsu@ubuntu:/mnt$ sudo fdisk -l
[sudo] password for naxsu:
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610
cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes
/ 512 bytes
I/O size (minimum/optimal): 512 bytes /
512 bytes
Disk identifier: 0x00063e01
Device Boot Start End Blocks
Id System
/dev/sda1 *
2048 40894463 20446208
83 Linux
/dev/sda2 40896510 41940991 522241 5
Extended
/dev/sda5 40896512 41940991 522240
82 Linux swap / Solaris
Disk /dev/sdb: 4011 MB, 4011851776 bytes
255 heads, 63 sectors/track, 487
cylinders, total 7835648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes
/ 512 bytes
I/O size (minimum/optimal): 512 bytes /
512 bytes
Disk identifier: 0x00328b06
Device Boot Start End Blocks
Id System
/dev/sdb1 *
63 7835647 3917792+ c
W95 FAT32 (LBA)
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naxsu@ubuntu:~$ sudo mount /dev/sdb1
/mnt/myusb
naxsu@ubuntu:~$ ls
naxsu@ubuntu:~$ cd /mnt/myusb/
naxsu@ubuntu:/mnt/myusb$ sudo cp
jdk-6u24-linux-i586.bin /usr/local/
naxsu@ubuntu:/usr/local$ sudo chmod u+x
jdk-6u24-linux-i586.bin
naxsu@ubuntu:/usr/local$ sudo
./jdk-6u24-linux-i586.bin
………
Press Enter to continue.....
Done.
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配置环境变量
用vim编辑，没有就安装
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naxsu@ubuntu:/usr/local/jdk1.6.0_24$ vim
/etc/profile
The program 'vim' can be found in the
following packages:
*
vim
*
vim-gnome
*
vim-tiny
*
vim-athena
*
vim-gtk
*
vim-nox
Try: sudo apt-get install <selected
package>
naxsu@ubuntu:/usr/local/jdk1.6.0_24$ sudo
apt-get install vim
naxsu@ubuntu:/usr/local$ sudo vim
/etc/profile
加入以下代码：
#set java environment
export JAVA_HOME= /usr/local/jdk1.6.0_24
export
CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export
PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOMR/bin
下面才有效
export
JAVA_HOME=/usr/local/jdk1.6.0_24
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH
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每次都用sudo太麻烦了，我们来激活root用户
naxsu@ubuntu:/usr/local$
sudo -s
root@ubuntu:/usr/local#
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让当前配置立即生效
root@ubuntu:~# source /etc/profile
测试安装是否成功
root@ubuntu:~# echo $JAVA_HOME
/usr/local/jdk1.6.0_24
root@ubuntu:~# echo $PATH
/usr/local/jdk1.6.0_24/bin:/bin:/jre/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/bin
root@ubuntu:~# echo $CLASSPATH
.:/usr/local/jdk1.6.0_24/lib/dt.jar:/usr/local/jdk1.6.0_24/lib/tools.jar
root@ubuntu:~# java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build
1.6.0_24-b07)
Java HotSpot(TM) Client VM (build
19.1-b02, mixed mode, sharing)
root@ubuntu:~#
以上提示说明安装成功。
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下一节，开始hodoop
