Jenkins installation

Jenkins Redhat Packages
To use this repository, run the following command:
  sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat/jenkins.repo
  sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io.key
  
If you've previously imported the key from Jenkins, the rpm --import will fail because you already have a key. Please ignore that and move on.
  yum install fontconfig java-11-openjdk
  yum install jenkins

[[email protected] ~]# rpm -ql jenkins
/etc/init.d/jenkins
/etc/logrotate.d/jenkins
/etc/sysconfig/jenkins
/usr/bin/jenkins
/usr/lib/systemd/system/jenkins.service
/usr/sbin/rcjenkins
/usr/share/java/jenkins.war
/usr/share/jenkins
/usr/share/jenkins/migrate
/var/cache/jenkins
/var/lib/jenkins
/var/log/jenkins
[[email protected] ~]# jenkins
June 29, 2022 11:17:28 In the morning Main verifyJavaVersion
serious : Running with Java class version 52, which is older than the Minimum required version 55. See https://jenkins.io/redirect/java-support/
java.lang.UnsupportedClassVersionError: 52.0
        at Main.verifyJavaVersion(Main.java:143)
        at Main.main(Main.java:107)

Jenkins requires Java versions [17, 11] but you are running with Java 1.8 from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.x86_64/jre
java.lang.UnsupportedClassVersionError: 52.0
        at Main.verifyJavaVersion(Main.java:143)
        at Main.main(Main.java:107)
[[email protected] ~]# yum search jdk
Loaded plug-in ：fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Loading mirror speeds from cached hostfile
 * base: mirrors.cqu.edu.cn
 * extras: mirrors.cqu.edu.cn
 * updates: mirrors.cqu.edu.cn
================================================== N/S matched: jdk ====================================================
copy-jdk-configs.noarch : JDKs configuration files copier
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 audio and video support
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.i686 : OpenJDK Runtime Environment 8
java-1.8.0-openjdk.x86_64 : OpenJDK 8 Runtime Environment
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-demo.i686 : OpenJDK Demos 8
java-1.8.0-openjdk-demo.x86_64 : OpenJDK 8 Demos
java-1.8.0-openjdk-devel.i686 : OpenJDK Development Environment 8
java-1.8.0-openjdk-devel.x86_64 : OpenJDK 8 Development Environment
java-1.8.0-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 8
java-1.8.0-openjdk-headless.x86_64 : OpenJDK 8 Headless Runtime Environment
java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation
java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed in a single archive
java-1.8.0-openjdk-src.i686 : OpenJDK Source Bundle 8
java-1.8.0-openjdk-src.x86_64 : OpenJDK 8 Source Bundle
java-11-openjdk.i686 : OpenJDK Runtime Environment 11
java-11-openjdk.x86_64 : OpenJDK 11 Runtime Environment
java-11-openjdk-demo.i686 : OpenJDK Demos 11
java-11-openjdk-demo.x86_64 : OpenJDK 11 Demos
java-11-openjdk-devel.i686 : OpenJDK Development Environment 11
java-11-openjdk-devel.x86_64 : OpenJDK 11 Development Environment
java-11-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 11
java-11-openjdk-headless.x86_64 : OpenJDK 11 Headless Runtime Environment
java-11-openjdk-javadoc.i686 : OpenJDK 11 API documentation
java-11-openjdk-javadoc.x86_64 : OpenJDK 11 API documentation
java-11-openjdk-javadoc-zip.i686 : OpenJDK 11 API documentation compressed in a single archive
java-11-openjdk-javadoc-zip.x86_64 : OpenJDK 11 API documentation compressed in a single archive
java-11-openjdk-jmods.i686 : JMods for OpenJDK 11
java-11-openjdk-jmods.x86_64 : JMods for OpenJDK 11
java-11-openjdk-src.i686 : OpenJDK Source Bundle 11
java-11-openjdk-src.x86_64 : OpenJDK 11 Source Bundle
java-11-openjdk-static-libs.i686 : OpenJDK libraries for static linking 11
java-11-openjdk-static-libs.x86_64 : OpenJDK 11 libraries for static linking
ldapjdk-javadoc.noarch : Javadoc for ldapjdk
icedtea-web.x86_64 : Additional Java components for OpenJDK - Java browser plug-in and Web Start implementation
ldapjdk.noarch : The Mozilla LDAP Java SDK

  Name and profile match only, Use “search all” try .
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[[email protected] ~]# yum list |grep java-11
java-11-openjdk.i686                      1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk.x86_64                    1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-demo.i686                 1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-demo.x86_64               1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-devel.i686                1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-devel.x86_64              1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-headless.i686             1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-headless.x86_64           1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-javadoc.i686              1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-javadoc.x86_64            1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-javadoc-zip.i686          1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-javadoc-zip.x86_64        1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-jmods.i686                1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-jmods.x86_64              1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-src.i686                  1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-src.x86_64                1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-static-libs.i686          1:11.0.15.0.9-2.el7_9        updates
java-11-openjdk-static-libs.x86_64        1:11.0.15.0.9-2.el7_9        updates
[[email protected] ~]# yum install -y java-11-openjdk.x86_64
Loaded plug-in ：fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager

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 * extras: mirrors.cqu.edu.cn
 * updates: mirrors.cqu.edu.cn
Resolving dependencies
--> Checking transactions
---> software package java-11-openjdk.x86_64.1.11.0.15.0.9-2.el7_9 Will be install
--> Dealing with dependencies java-11-openjdk-headless(x86-64) = 1:11.0.15.0.9-2.el7_9, It's packaged 1:java-11-openjdk-11.0.15.0.9-2.el7_9.x86_64 need
--> Checking transactions
---> software package java-11-openjdk-headless.x86_64.1.11.0.15.0.9-2.el7_9 Will be install
--> Resolve dependency complete

Dependency resolution

===================================================================================================================
 Package                               framework           edition                               Source           size
==================================================================================================================
Installing :
 java-11-openjdk                      x86_64           1:11.0.15.0.9-2.el7_9          updates                       235 k
Install for dependency :
 java-11-openjdk-headless             x86_64           1:11.0.15.0.9-2.el7_9         updates                        39 M

Business summary
====================================================================================================================
install  1 software package (+1 Dependent packages )

Total Downloads ：40 M
Installation size ：166 M
Downloading packages:
(1/2): java-11-openjdk-11.0.15.0.9-2.el7_9.x86_64.rpm                                        | 235 kB  00:00:00
(2/2): java-11-openjdk-headless-11.0.15.0.9-2.el7_9.x86_64.rpm                               |  39 MB  00:00:05
-----------------------------------------------------------------------------------------------------------
A total of                                                                                  7.6 MB/s |  40 MB  00:00:05
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing    : 1:java-11-openjdk-headless-11.0.15.0.9-2.el7_9.x86_64                          1/2
  Installing    : 1:java-11-openjdk-11.0.15.0.9-2.el7_9.x86_64                                   2/2
  Verification in progress      : 1:java-11-openjdk-headless-11.0.15.0.9-2.el7_9.x86_64                          1/2
  Verification in progress      : 1:java-11-openjdk-11.0.15.0.9-2.el7_9.x86_64                                   2/2

already installed :
  java-11-openjdk.x86_64 1:11.0.15.0.9-2.el7_9

Installed as a dependency :
  java-11-openjdk-headless.x86_64 1:11.0.15.0.9-2.el7_9

complete ！
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[[email protected] ~]# java -version
openjdk version "1.8.0_332"
OpenJDK Runtime Environment (build 1.8.0_332-b09)
OpenJDK 64-Bit Server VM (build 25.332-b09, mixed mode)
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[[email protected] ~]# rpm -ql jdk
Package not installed jdk
[[email protected] ~]# rpm -qa jdk
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[[email protected] ~]# vi /etc/profile
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[[email protected] ~]# source /etc/profile Modify environment variables , To configure JAVA_HOME
[[email protected] ~]# java -version
openjdk version "1.8.0_332"
OpenJDK Runtime Environment (build 1.8.0_332-b09)
OpenJDK 64-Bit Server VM (build 25.332-b09, mixed mode)
[[email protected] ~]# whereis java
java: /usr/bin/java /usr/lib/java /etc/java /usr/share/java /usr/share/man/man1/java.1.gz
[[email protected] ~]# ls -las /usr/bin/java
0 lrwxrwxrwx 1 root root 22 6 month  29 11:19 /usr/bin/java -> /etc/alternatives/java
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[[email protected] ~]# alternatives --config java

share 4 Provide “java” The program .

  Options     command
-----------------------------------------------
   1           java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.261-2.6.22.2.el7_8.x86_64/jre/bin/java)
*+ 2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.x86_64/jre/bin/java)
   3           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
   4           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.15.0.9-2.el7_9.x86_64/bin/java)

Press Enter Keep current options [+], Or type the option number ：4
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some Java Application usage JAVA_HOME Environment variables to determine Java Installation position , And specify which should be used Java Version to run the application .
vi /etc/profile.d/java.sh
add to
JAVA_HOME="/usr/lib/jvm/java-11-openjdk"

[[email protected] ~]# source /etc/profile
[[email protected] ~]# echo $JAVA_HOME
/usr/lib/jvm/java-11-openjdk-11.0.13.0.8-1.el7_9.x86_64
[[email protected] ~]#