参见： https://www.jb51.net/article/112612.htm 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
参见：https://www.jb51.net/article/112612.htm
检查一下系统中的jdk版本
[hadoop@master ~]$ java -version
openjdk 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 java
python-javapackages-3.4.1-11.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2019b-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64
java-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, ulninfo
Resolving 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 Resolution
ol7_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 M
Removing 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 M
Transaction Summary
==========================================================================================================================================================================================================
Remove 2 Packages (+3 Dependent packages)
Installed size: 110 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running 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_191
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH最后生效一下source /etc/profile
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