firewall configuration

```bash
sudo ufw enable
sudo ufw allow 8080
sudo ufw status 
```

install-jenkins-on-ubuntu-19-part-1.md

• Create a Google Cloud instance using f1-micro
• Select boot disk Ubuntu 19.04 minimal
• Allow HTTP and HTTPS traffic

sudo apt update && \
sudo apt install openjdk-8-jdk vim iputils-ping ufw -y

install-jenkins-on-ubuntu-19-part-2.md

Jenkins runs with Java 8 so set it as the default

sudo update-alternatives --config java

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 

install-jenkins-on-ubuntu-19-part-3.md

Install Jenkins.

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 -y

Confirm the service is running.

sudo systemctl status jenkins

References

• https://jenkins.io/doc/book/installing/