参见：https://www.cnblogs.com/Dylansuns/p/6974272.html Linux安装JDK完整步骤
检查一下系统中的jdk版本
[hadoop@master ~]$ java -versionopenjdk version "1.8.0_222-ea"OpenJDK Runtime Environment (build 1.8.0_222-ea-b03)OpenJDK 64-Bit Server VM (build 25.222-b03, mixed mode)
检测jdk安装包
[hadoop@master ~]$ rpm -qa | grep javapython-javapackages-3.4.1-11.el7.noarchjavapackages-tools-3.4.1-11.el7.noarchtzdata-java-2019b-1.el7.noarchjava-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64[hadoop@master ~]$
卸载openjdk
[hadoop@master ~]$ sudo yum -y remove *openjdk*[sudo] password for hadoop: Loaded plugins: langpacks, ulninfoResolving Dependencies--> Running transaction check---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.222.b03-1.el7 will be erased--> Processing Dependency: java >= 1.5 for package: jline-1.0-8.el7.noarch--> Processing Dependency: java-1.8.0-openjdk for package: icedtea-web-1.7.1-1.el7.x86_64---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.222.b03-1.el7 will be erased--> Running transaction check---> Package icedtea-web.x86_64 0:1.7.1-1.el7 will be erased---> Package jline.noarch 0:1.0-8.el7 will be erased--> Processing Dependency: jline for package: rhino-1.7R5-1.el7.noarch--> Running transaction check---> Package rhino.noarch 0:1.7R5-1.el7 will be erased--> Finished Dependency Resolutionol7_UEKR5/x86_64 | 2.5 kB 00:00:00 ol7_latest/x86_64 | 2.7 kB 00:00:00 Dependencies Resolved========================================================================================================================================================================================================== Package Arch Version Repository Size==========================================================================================================================================================================================================Removing: java-1.8.0-openjdk x86_64 1:1.8.0.222.b03-1.el7 @anaconda/7.7 642 k java-1.8.0-openjdk-headless x86_64 1:1.8.0.222.b03-1.el7 @anaconda/7.7 106 MRemoving for dependencies: icedtea-web x86_64 1.7.1-1.el7 @anaconda/7.7 2.3 M jline noarch 1.0-8.el7 @anaconda/7.7 72 k rhino noarch 1.7R5-1.el7 @anaconda/7.7 1.1 MTransaction Summary==========================================================================================================================================================================================================Remove 2 Packages (+3 Dependent packages)Installed size: 110 MDownloading packages:Running transaction checkRunning transaction testTransaction test succeededRunning transaction Erasing : icedtea-web-1.7.1-1.el7.x86_64 1/5 Erasing : rhino-1.7R5-1.el7.noarch 2/5 Erasing : jline-1.0-8.el7.noarch 3/5 Erasing : 1:java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64 4/5 Erasing : 1:java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64 5/5 Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64 1/5 Verifying : 1:java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64 2/5 Verifying : icedtea-web-1.7.1-1.el7.x86_64 3/5 Verifying : rhino-1.7R5-1.el7.noarch 4/5 Verifying : jline-1.0-8.el7.noarch 5/5 Removed: java-1.8.0-openjdk.x86_64 1:1.8.0.222.b03-1.el7 java-1.8.0-openjdk-headless.x86_64 1:1.8.0.222.b03-1.el7 Dependency Removed: icedtea-web.x86_64 0:1.7.1-1.el7 jline.noarch 0:1.0-8.el7 rhino.noarch 0:1.7R5-1.el7 Complete!
上传安装介质并解压
[hadoop@master ~]$ sudo tar -xzf jdk-8u191-linux-x64.tar.gz -C /usr/lib/jvm
设置环境变量,在/etc/profile最前面加上
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_191export JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/libexport PATH=${JAVA_HOME}/bin:$PATH最后生效一下source /etc/profile
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