• OpenJDK 8: yum install java-1.8.0-openjdk-devel
• Maven: see installation instructions below

Pull the Jenkins repository file and import its GPG key:

wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins.io/redhat-stable/jenkins.repo
rpm --import http://pkg.jenkins.io/redhat-stable/jenkins.io.key

… then, do a yum update and yum install jenkins
If the jenkins login isn't locked down off-server:

• Enable login for Jenkins with usermod -s /bin/bash jenkins
• Log in as jenkins and create SSH key with: ssh-keygen -t rsa

Otherwise:

• Create SSH key for jenkins from root: ssh-keygen -f id_rsa -C “jenkins@bluejay”

Open firewall for Jenkins:

firewall-cmd --permanent --zone=public --add-port=8080/tcp
firewall-cmd --reload

Remember to systemctl enable jenkins and systemctl start jenkins
Log in (default login is admin with password admin) and change password, add user(s)

Get latest maven archive, example:

wget http://www-eu.apache.org/dist/maven/maven-3/3.6.0/binaries/apache-maven-3.6.0-bin.tar.gz

Extract to suitable location and sym-link to it (/usr/maven or /opt/maven)
Set environment variables in /etc/profile.d/maven.sh:

export M3_HOME=/usr/maven
export M2_HOME=${M3_HOME}
export PATH=${M3_HOME}/bin:${PATH}

… perform a source /etc/profile.d/maven.sh to get these in current shell.

Some environment variables may need to be set at the global level, which can be configured under the “Manage Jenkins” section:

• PATH
• JAVA_HOME
• M3_HOME

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

NOTE: 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.

You will need to explicitly install a Java runtime environment, because Oracle's Java RPMs are incorrect and fail to register as providing a java dependency. Thus, adding an explicit dependency requirement on Java would force installation of the OpenJDK JVM.
With that set up, the Jenkins package can be installed with:

yum install jenkins