Jenkins setup in Ubuntu - GCE, DigitalOcean or AWS instance

Jenkins setup in Ubuntu.txt

What is Jenkins?
Jenkins is an open source automation server written in Java. Jenkins helps to automate the non-human part of the software development process, with continuous integration and facilitating technical aspects of continuous delivery. (Wikipedia)

1. Install required packages

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 -y jenkins

2. Start jenkins service

sudo service jenkins start

Now jenkins will be available at port 8080 of your server. You can do the first-time setup by going to 
<server-ip>:8080

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To move jenkins to default HTTP port (port 80) so that you can map it to your own domain:

sudo apt install -y firewalld

Then find out the default network interface. To do that, run "netstat -i" and remember the Iface other than "lo". In case of Google Cloud instance, it is "ens4"

sudo firewall-cmd --zone=public --change-interface=<interface>
sudo firewall-cmd --zone=public --add-masquerade --permanent
sudo firewall-cmd --zone=public --add-forward-port=port=80:proto=tcp:toport=8080 --permanent
sudo firewall-cmd --runtime-to-permanent
sudo firewall-cmd --reload
sudo systemctl restart firewalld
sudo systemctl disable ebtables
sudo systemctl mask ebtables

Now you can open jenkins by going to <server-ip>. You can also map the server IP to your custom domain.
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NOTE: Command to fix jenkins permissions of a dir
sudo setfacl -Rm u:jenkins:rwx <dir>
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Link for plugins & other useful links
https://plugins.jenkins.io/ansicolor
https://plugins.jenkins.io/simple-theme-plugin
https://plugins.jenkins.io/publish-over-ftp
https://plugins.jenkins.io/telegram-notifications
http://afonsof.com/jenkins-material-theme/