How-to-Install-Jenkins-on-Rocky-Linux-9.md

Gist for https://youtu.be/2-L0WohfsqY

Install Temurin JDK

From CentOS/RHEL/Fedora Instructions:

• Create RPM repository

cat <<EOF > /etc/yum.repos.d/adoptium.repo
[Adoptium]
name=Adoptium
baseurl=https://packages.adoptium.net/artifactory/rpm/${DISTRIBUTION_NAME:-$(. /etc/os-release; echo $ID)}/\$releasever/\$basearch
enabled=1
gpgcheck=1
gpgkey=https://packages.adoptium.net/artifactory/api/gpg/key/public
EOF

• Install Temurin 11 (this will fail)

  • dnf -y install temurin-11-jdk

• Modify /etc/yum.repos.d/adoptium.repo

  • change rocky/$releasever to rocky/8

• Install Temurin 11 (this will succeed)

  • dnf -y install temurin-11-jdk

Install Jenkins

From Jenkins Redhat Packages:

• Create RPM repository

  • wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo

• Add repository key

  • rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key

• Install Jenkins

  • dnf -y install jenkins

Configure Jenkins

• systemctl --full status jenkins
• systemctl edit jenkins

[Service]
Environment="JAVA_OPTS=-Djava.awt.headless=true -Djava.net.preferIPv4Stack=true -Djava.io.tmpdir=/var/cache/jenkins/tmp/ -Dorg.apache.commons.jelly.tags.fmt.timeZone=America/New_York -Duser.timezone=America/New_York"
Environment="JENKINS_OPTS=--pluginroot=/var/cache/jenkins/plugins"

• mkdir -p /var/cache/jenkins/tmp
• chown -R jenkins:jenkins /var/cache/jenkins/tmp
• systemctl show jenkins
• systemd-analyze verify jenkins.service
• systemctl start jenkins
• systemctl --full status jenkins
• journalctl -u jenkins

Thanks for these great instructions and the YouTube video.. Super helpful!

One minor error above, it should be "systemctl --full status jenkins" on the second to last line. Looks like a "long dash" has got in there instead of two short dashes.

Thanks for catching that. Copy and paste strikes again.

Thanks for updating. I'm new to both Rocky and Jenkins (I use Ubuntu mostly so a switch from Debian to Red Hat is taking time!) and this was very useful.

Hello,
I am getting that error;

[root@localhost ~]# systemd-analyze verify jenkins.service
[root@localhost ~]# systemctl start jenkins
Job for jenkins.service failed because the control process exited with error code.
See "systemctl status jenkins.service" and "journalctl -xeu jenkins.service" for details.

When I run recommended commands, outputs;

[root@localhost ~]# systemctl status jenkins.service
× jenkins.service - Jenkins Continuous Integration Server
     Loaded: loaded (/usr/lib/systemd/system/jenkins.service; disabled; preset: disabled)
    Drop-In: /etc/systemd/system/jenkins.service.d
             └─override.conf
     Active: failed (Result: exit-code) since Tue 2024-10-22 02:24:16 +03; 2min 36s ago
    Process: 51945 ExecStart=/usr/bin/jenkins (code=exited, status=1/FAILURE)
   Main PID: 51945 (code=exited, status=1/FAILURE)
        CPU: 508ms

Oct 22 02:24:15 localhost.localdomain systemd[1]: jenkins.service: Main process exited, code=exited, status=1/FAILURE
Oct 22 02:24:15 localhost.localdomain systemd[1]: jenkins.service: Failed with result 'exit-code'.
Oct 22 02:24:15 localhost.localdomain systemd[1]: Failed to start Jenkins Continuous Integration Server.
Oct 22 02:24:16 localhost.localdomain systemd[1]: jenkins.service: Scheduled restart job, restart counter is at 5.
Oct 22 02:24:16 localhost.localdomain systemd[1]: Stopped Jenkins Continuous Integration Server.
Oct 22 02:24:16 localhost.localdomain systemd[1]: jenkins.service: Start request repeated too quickly.
Oct 22 02:24:16 localhost.localdomain systemd[1]: jenkins.service: Failed with result 'exit-code'.
Oct 22 02:24:16 localhost.localdomain systemd[1]: Failed to start Jenkins Continuous Integration Server.

and

[root@localhost ~]# journalctl -xeu jenkins.service
░░ Support: https://wiki.rockylinux.org/rocky/support
░░ 
░░ Automatic restarting of the unit jenkins.service has been scheduled, as the result for
░░ the configured Restart= setting for the unit.
Oct 22 02:24:16 localhost.localdomain systemd[1]: Stopped Jenkins Continuous Integration Server.
░░ Subject: A stop job for unit jenkins.service has finished
░░ Defined-By: systemd
░░ Support: https://wiki.rockylinux.org/rocky/support
░░ 
░░ A stop job for unit jenkins.service has finished.
░░ 
░░ The job identifier is 8703 and the job result is done.
Oct 22 02:24:16 localhost.localdomain systemd[1]: jenkins.service: Start request repeated too quickly.
Oct 22 02:24:16 localhost.localdomain systemd[1]: jenkins.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://wiki.rockylinux.org/rocky/support
░░ 
░░ The unit jenkins.service has entered the 'failed' state with result 'exit-code'.
Oct 22 02:24:16 localhost.localdomain systemd[1]: Failed to start Jenkins Continuous Integration Server.
░░ Subject: A start job for unit jenkins.service has failed
░░ Defined-By: systemd
░░ Support: https://wiki.rockylinux.org/rocky/support
░░ 
░░ A start job for unit jenkins.service has finished with a failure.
░░ 
░░ The job identifier is 8703 and the job result is failed.

and in case you would ask me, my java version is;

[root@localhost ~]# java -version
openjdk version "11.0.24" 2024-07-16
OpenJDK Runtime Environment Temurin-11.0.24+8 (build 11.0.24+8)
OpenJDK 64-Bit Server VM Temurin-11.0.24+8 (build 11.0.24+8, mixed mode)

any help?

Edit: I solved myself, I forgot to do chown -R jenkins:jenkins /var/cache/jenkins/tmp
PS: For anyone out there, I solved by looking at the log file with journalctl -u jenkins.service --no-pager;
it outputs the error like this;

Exception in thread "main" java.io.UncheckedIOException: Jenkins failed to create a temporary file in /var/cache/jenkins/tmp/: java.io.IOException: No such file or directory

Long story short, do not forget to look log :)

Thanks.