RHEL 7 Install Jenkins LTS

# Add jenkins repo
sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat/jenkins.repo

# Import repo
sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io-2023.key
# Upgrade
sudo yum upgrade

sudo yum install jenkins

# Enable jenkins as service when server start
sudo systemctl enable jenkins

# Start Jenkins server
sudo systemctl start jenkins

# Check status
sudo systemctl status jenkins
# Output
● jenkins.service - Jenkins Continuous Integration Server
   Loaded: loaded (/usr/lib/systemd/system/jenkins.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2022-08-06 23:37:25 ADT; 7s ago
 Main PID: 4106 (java)
    Tasks: 52
   CGroup: /system.slice/jenkins.service
           └─4106 /usr/bin/java -Djava.awt.headless=true -jar /usr/share/java/jenkins.war --webroot=%C/jenkins/war --httpPort=8080

# jenkins_firewall.sh
YOURPORT=8080
PERM="--permanent"
SERV="$PERM --service=jenkins"

firewall-cmd $PERM --new-service=jenkins
firewall-cmd $SERV --set-short="Jenkins ports"
firewall-cmd $SERV --set-description="Jenkins port exceptions"
firewall-cmd $SERV --add-port=$YOURPORT/tcp
firewall-cmd $PERM --add-service=jenkins
firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --reload