Hadoop Cluster Series one: Linux installation Jdk__linux

1: Upload JDK package, use XFTP

2: Query the built-in JDK version

Rpm-qa|grep JDK

3. Uninstall the built-in JDK

sudo rpm-e--nodeps java-1.8.0-openjdk-headless-1.8.0.131-11.b12.el7.x86_64 Java-1.8.0-openjdk-1.8.0.131-11.b12.el7.x86_64 java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.5.el7.x86_64 Copy-jdk-configs-2.2-3.el7.noarch java-1.7.0-openjdk-1.7.0.141-2.6.10.5.el7.x86_64

4. Configure System Environment variables

sudo vim/etc/profile

Export java_home=/opt/app/jdk1.8.0_144
Export path= $JAVA _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

5. Make configuration effective

Source/etc/profile

6. Verify that the installation is successful