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This article is to share with you about how to install offline JDK1.8 in centos7.0. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article.

View the java repository version

Yum list | grep java

View the installed version of java jdk

Rpm-qa | grep java

If no message is displayed, the jdk version is not installed.

If the following message is displayed:

Rpm-qa | grep jdkjava-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64 java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64 java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64 java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64

Uninstall command

Yum-y remove java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64

The Java command is not recognized after the uninstall is complete

Java-version

Bash: java: command not found...

Start installation

Go to the official website to download jdk: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Extract to the installation directory

The current version is jdk1.8.172

Jdk-8u172-linux-x64.gz

Set up the installation directory

Cd home; adduser hadoop; passwd hadoop; whereis sudoers ls-l / etc/sudoers

Add writeable permissions

Chmod-v USBW / etc/sudoers

Then edit the / etc/sudoers file

Vi / etc/sudoers

Add the following hadoop code:

Allow root to run any commands anywhereroot ALL= (ALL) ALL hadoop ALL= (ALL) ALL # this is new add user / /-ls-l / etc/sudoers

Remove writeable permissions

Chmod-v Umurw / etc/sudoers sudo-u hadoop sudo cat / etc/passwd

The hadoop user is now a user with sudo privileges.

Tar-zxvf jdk-8u172-linux-x64.gz-C / home/hadoop/java/

Change the directory name

Mv jdk1.8.0_172/ jdk1.8/

Go to the jdk folder and get the absolute path of the directory

Pwd

[root@hadoop-localhost jdk1.8] # pwd / home/hadoop/java/jdk1.8

(my absolute path is: / home/hadoop/java/jdk1.8)

Configuration of jdk

Use the vim command to open the system's environment variable configuration file:

Vi / etc/profile

At the end of the profile file, add:

/ / # # absolute path of JAVA export JAVA_HOME=/home/hadoop/java/jdk1.8 / / jdk (mine is: / home/hadoop/java/jdk1.8) export PATH=PATH: PATH:JAVA_HOME/bin

Jdk configuration verification

Enable the profile first

Source / etc/profile [root@hadoop-localhost jdk1.8] # source / etc/profilejava-version [root@hadoop-localhost jdk1.8] # java-version java version "1.8.0x172" Java (TM) SE Runtime Environment (build 1.8.0_172-b11) Java HotSpot (TM) 64-Bit Server VM (build 25.172-b11, mixed mode) above is how to install offline JDK1.8 in centos7.0 The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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