Hadoop Elephant Tour 005-Install the JDK environment

Hadoop Elephant Safari 005- Installing the JDK environment

sinom

    becauseHadoopneed to run onJAVAplatform, so we also need toCentOSinstalled inJavathe environment, where we chooseJavathe version isJdk-6u45-linux-i586.bin;

1. upload the JDK file to CentOS

securefxportable.exe centos /usr/local folder, will jdk-6u45-linux-i586.bin upload Span style= "Font-family:courier new;font-size:18px;color:black;" >/usr/local

2. Installing the JDK

referring to the method described in the previous section, use the SecureCRTPortable.exe Login CentOS , into the /usr/local directory.

use the command " . / Jdk-6u45-linux-i586.bin " Unzip the installation JDK ,

If you cannot do this, use the command first " chmod 755 jdk-6u45-linux-i586.bin" gives the current user permission to execute the file

after the decompression is complete, we use the command " ls" to see the newly created directory jdk1.6.0_45

use the command " mv jdk1.6.0_45/ jdk" rename the folder name to facilitate reference later

3. Configuring the JDK Environment Variables

Next put JDK configured in the environment variable.

use the command " vi/etc/profile" Edit configuration file

use the shortcut key " i" Enter the file editing mode, the file finally added the following content.

Exportjava_home=/usr/local/jdk

Exportpath=.: $PATH: $JAVA _home/bin

use the shortcut key " ESC" exit file editing mode;

Use the Shift "and": "Combo key into command mode, enter command" Wq "Save and exit.

Here's an explanation: " Export "is a keyword that is used to set environment variables. We set up two environment variables, one is java_home,

one is PATH . For a reference to an environment variable, use"$", a connection between multiple environment variables, using ":".

use the command " Source /etc/profile" makes the above configuration effective immediately

use the command " java –version" detects if the JDK is configured successfully ! See the following tips, congratulations, the configuration is successful ~!~

Hadoop Elephant Tour 005-Install the JDK environment