Jenkins Setup on Linux

https://www.youtube.com/watch?v=rgai3yzRsA0

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sestatus- it is a firwall and should be Disabled. If it's enable execute commands from below links:
https://www.cyberciti.biz/faq/disable-selinux-on-centos-7-rhel-7-fedora-linux/

systemctl stop firewalld

systemctl disable firewalld

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Jenkins:

https://pkg.jenkins.io/redhat-stable/

Commands:

3-systemctl start jenkins

4-netstat -lntp | grep 6444

Jenkins Slack Notification:

https://www.youtube.com/watch?v=TWwvxn2-J7E

Id: 
creedential as Secret text (Secret field)

NOTE: Team subdomain is your workspace, integration token must be stored in credential. They've updated the plugin and remove/rename some options 

 cd /var/lib/jenkins


sudo service jenkins restart
sudo service jenkins stop
sudo service jenkins start

Uninstall jenkinns:

Go to the certain jenkins path and execute below commands:
1-sudo yum remove jenkins
2-sudo rm -r /var/lib/jenkins

if you are getting error in yum install command then download rpn and placed it on a path and execute below command.
cd /data/media/
rpm -Uvh jenkins-2.235.5-1.1.noarch.rpm

https://medium.com/appgambit/integrating-jenkins-with-slack-notifications-4f14d1ce9c7a