1, use yum to find jdk
yum search java|grep jdk
[root@node1 ~]# yum search java|grep jdk ldapjdk-javadoc.noarch : Javadoc for ldapjdk java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.7.0-openjdk-headless.x86_64 : The OpenJDK runtime environment without java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk.i686 : OpenJDK Runtime Environment 8 java-1.8.0-openjdk-accessibility.i686 : OpenJDK accessibility connector java-1.8.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector java-1.8.0-openjdk-accessibility-debug.i686 : OpenJDK 8 accessibility connector java-1.8.0-openjdk-accessibility-debug.x86_64 : OpenJDK 8 accessibility java-1.8.0-openjdk-debug.i686 : OpenJDK Runtime Environment 8 with full debug on java-1.8.0-openjdk-debug.x86_64 : OpenJDK Runtime Environment 8 with full debug java-1.8.0-openjdk-demo.i686 : OpenJDK Demos 8 java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos 8 java-1.8.0-openjdk-demo-debug.i686 : OpenJDK Demos 8 with full debug on java-1.8.0-openjdk-demo-debug.x86_64 : OpenJDK Demos 8 with full debug on java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.8.0-openjdk-devel.i686 : OpenJDK Development Environment 8 java-1.8.0-openjdk-devel-debug.i686 : OpenJDK Development Environment 8 with java-1.8.0-openjdk-devel-debug.x86_64 : OpenJDK Development Environment 8 with java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 8 java-1.8.0-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full java-1.8.0-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation java-1.8.0-openjdk-javadoc-debug.noarch : OpenJDK 8 API documentation for java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed java-1.8.0-openjdk-javadoc-zip-debug.noarch : OpenJDK 8 API documentation java-1.8.0-openjdk-src.i686 : OpenJDK Source Bundle 8 java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle 8 java-1.8.0-openjdk-src-debug.i686 : OpenJDK Source Bundle 8 for packages with java-1.8.0-openjdk-src-debug.x86_64 : OpenJDK Source Bundle 8 for packages with java-11-openjdk.x86_64 : OpenJDK Runtime Environment 11 java-11-openjdk.i686 : OpenJDK Runtime Environment 11 java-11-openjdk-debug.i686 : OpenJDK Runtime Environment 11 with full debug on java-11-openjdk-debug.x86_64 : OpenJDK Runtime Environment 11 with full debug on java-11-openjdk-demo.i686 : OpenJDK Demos 11 java-11-openjdk-demo.x86_64 : OpenJDK Demos 11 java-11-openjdk-demo-debug.i686 : OpenJDK Demos 11 with full debug on java-11-openjdk-demo-debug.x86_64 : OpenJDK Demos 11 with full debug on java-11-openjdk-devel.i686 : OpenJDK Development Environment 11 java-11-openjdk-devel.x86_64 : OpenJDK Development Environment 11 java-11-openjdk-devel-debug.i686 : OpenJDK Development Environment 11 with full java-11-openjdk-devel-debug.x86_64 : OpenJDK Development Environment 11 with java-11-openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment 11 java-11-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 11 java-11-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full java-11-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full java-11-openjdk-javadoc.i686 : OpenJDK 11 API documentation java-11-openjdk-javadoc.x86_64 : OpenJDK 11 API documentation java-11-openjdk-javadoc-debug.i686 : OpenJDK 11 API documentation for packages java-11-openjdk-javadoc-debug.x86_64 : OpenJDK 11 API documentation for packages java-11-openjdk-javadoc-zip.i686 : OpenJDK 11 API documentation compressed in java-11-openjdk-javadoc-zip.x86_64 : OpenJDK 11 API documentation compressed in java-11-openjdk-javadoc-zip-debug.i686 : OpenJDK 11 API documentation compressed java-11-openjdk-javadoc-zip-debug.x86_64 : OpenJDK 11 API documentation java-11-openjdk-jmods.i686 : JMods for OpenJDK 11 java-11-openjdk-jmods.x86_64 : JMods for OpenJDK 11 java-11-openjdk-jmods-debug.i686 : JMods for OpenJDK 11 with full debug on java-11-openjdk-jmods-debug.x86_64 : JMods for OpenJDK 11 with full debug on java-11-openjdk-src.i686 : OpenJDK Source Bundle 11 java-11-openjdk-src.x86_64 : OpenJDK Source Bundle 11 java-11-openjdk-src-debug.i686 : OpenJDK Source Bundle 11 for packages with java-11-openjdk-src-debug.x86_64 : OpenJDK Source Bundle 11 for packages with java-latest-openjdk.x86_64 : OpenJDK Runtime Environment 13 java-latest-openjdk-debug.x86_64 : OpenJDK Runtime Environment 13 with full java-latest-openjdk-demo.x86_64 : OpenJDK Demos 13 java-latest-openjdk-demo-debug.x86_64 : OpenJDK Demos 13 with full debug on java-latest-openjdk-devel.x86_64 : OpenJDK Development Environment 13 java-latest-openjdk-devel-debug.x86_64 : OpenJDK Development Environment 13 with java-latest-openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment 13 java-latest-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with java-latest-openjdk-javadoc.x86_64 : OpenJDK 13 API documentation java-latest-openjdk-javadoc-zip.x86_64 : OpenJDK 13 API documentation compressed java-latest-openjdk-jmods.x86_64 : JMods for OpenJDK 13 java-latest-openjdk-jmods-debug.x86_64 : JMods for OpenJDK 13 with full debug on java-latest-openjdk-src.x86_64 : OpenJDK Source Bundle 13 java-latest-openjdk-src-debug.x86_64 : OpenJDK Source Bundle 13 for packages ldapjdk.noarch : The Mozilla LDAP Java SDK
2, the installation command:
yum install java-1.8.0-openjdk
3. After a successful installation, the default installation path
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64
4, verify whether the installation was successful java
View java version: java -version
[root@node1 ~]# java -version openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)
View java is available: javac
[root@node1 ~]# javac
-bash: javac: command not found
Cause: After installing only the default runtime environment, java installation directory under jre folder only
5, install the development environment
yum install java-1.8.0-openjdk-devel.x86_64
Installing can see the emergence of java installation directory under the bin, lib and other folders:
6, once again enter javac verify successful
[root@node1 ~]# javac Usage: javac <options> <source files> where possible options include: -g Generate all debugging info -g:none Generate no debugging info -g:{lines,vars,source} Generate only some debugging info -nowarn Generate no warnings -verbose Output messages about what the compiler is doing -deprecation Output source locations where deprecated APIs are used -classpath <path> Specify where to find user class files and annotation processors -cp <path> Specify where to find user class files and annotation processors -sourcepath <path> Specify where to find input source files -bootclasspath <path> Override location of bootstrap class files -extdirs <dirs> Override location of installed extensions -endorseddirs <dirs> Override location of endorsed standards path -proc:{none,only} Control whether annotation processing and/or compilation is done. -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process -processorpath <path> Specify where to find annotation processors -parameters Generate metadata for reflection on method parameters -d <directory> Specify where to place generated class files -s <directory> Specify where to place generated source files -h <directory> Specify where to place generated native header files -implicit:{none,class} Specify whether or not to generate class files for implicitly referenced files -encoding <encoding> Specify character encoding used by source files -source <release> Provide source compatibility with specified release -target <release> Generate class files for specific VM version -profile <profile> Check that API used is available in the specified profile -version Version information -help Print a synopsis of standard options -Akey[=value] Options to pass to annotation processors -X Print a synopsis of nonstandard options -J<flag> Pass <flag> directly to the runtime system -Werror Terminate compilation if warnings occur @<filename> Read options and filenames from file
7, set the environment variable
to modify / etc / profile file: vi / etc / profile
add the following to the end of the profile file:
#set java environment JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64 JRE_HOME=$JAVA_HOME/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
8, the environment variables to take effect:
source /etc/profile
9, see the Environment Variables
echo $ JAVA_HOME environment variable View
[root@node1 ~]# echo $JAVA_HOME /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64
To this end, to complete!