Install Jenkins on Ubuntu

sudo apt update
sudo apt install default-jdk default-jre
javac
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c "echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list"
sudo apt update
sudo apt install jenkins
sudo service jenkins start
sudo service jenkins status

Open Browser and hit following url

http://localhost:8080/

To view default initial password

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Install recommended Plugins. Make sure Git Plugin is installed

Username: admin
Password: Shift + 5
Full name: Administrator

Jenkins URL: http://localhost:8080/
Or
http://youripaddress:8080/
Or
http://yourdomain:8080/

Create New Item (New project for build)

Create release_project.sh file

rsync -av --exclude-from='.releaseignore' <src_dir_path> <dest_dir_path>

Add files and directories entries in .releaseignore file to skip rsync

node_modules
.git
private_documents

After creating freestyle project if you face any permission issue then try one of the following solutions

sudo su -
vim /etc/sudoers

Add following entry at end of file

#add jenkins as sudoer
jenkins        ALL=(ALL)       NOPASSWD: ALL

OR add user to the group

sudo usermod -a -G sudo jenkins

Ref:
medium.com
stackoverflow