At the moment, Jenkins is running in a main IP Address and now I want to change it to IPADDR/jenkins cause I wanted to run another website there.
I did the change from Jenkins Configuration "Jenkins URL" to IPADDR/jenkins but Jenkins is still accessible by the main ip address so I cannot host all the other websites cause everywhere I go, I got redirected to Jenkins.
Using ubuntu 16.04 w/ apache2.
You must configure your web server to act as a reverse proxy. Then it can
/jenkins/...URLs to Jenkins, and
See the Jenkins Wiki for details on running Jenkins behind a reverse proxy.