How to Monitor Jenkins Performance with the help of Prometheus and Grafana

5 min readAug 6, 2023

Launch 1 EC2 instance with t2.medium with Ubuntu OS and open port 8080,9090,3000 where 8080=Jenkins, 9090=Prometheus & 3000=Grafana
After Launch Instance Connect it and update before start

apt-get update

3. After Updating first check is java in installed on your vm if yes you can skip this step if not let’s install Java version 17 because java-11 not support to Jenkins now

apt install openjdk-17-jre-headless

4. After Installing Java let’s begin Installation of Jenkins first we add or download Jenkins key

curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null

sudo apt-get update
sudo apt-get install jenkins

5. You can see my Jenkins running now, for accessing jenkins open port 8080 in AWS SG group and copy public ip of instance and hit with port 8080

6. to login further see the /var/lib/jenkins/secrets/initialAdminPassword file for an initial password

cat /var/lib/jenkins/secrets/initialAdminPassword

7. After paste the password click on continue and then install “Suggested Plugin”

8. Now fill the user details as you want and keep url same

9. and finally click on “Start using Jenkins”

10. Now lets install Prometheus and Grafana quickly

##################Prometheus############################
#Download the latest version of Prometheus using the following command:
wget https://github.com/prometheus/prometheus/releases/download/v2.30.0/prometheus-2.30.0.linux-amd64.tar.gz
#Extract the downloaded archive:
tar xvfz prometheus-2.30.0.linux-amd64.tar.gz
#Move into the extracted directory:
cd prometheus-2.30.0.linux-amd64

11. After Installing lets create a service of Prometheus

cd /etc/systemd/system/
sudo vi prometheus.service

[Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/path/to/prometheus --config.file=/path/to/prometheus.yml
Restart=always
 
[Install]
WantedBy=default.target

12. After save this file reload the daemon service to verify our configuration file is correct and also enable and start the Prometheus service

sudo systemctl daemon-reload
sudo systemctl enable prometheus.service
sudo systemctl start prometheus.service
sudo systemctl status prometheus.service

13. If all things work fine you will see you service is running properly and after that copy the Public IP of your Instance and hit with port 9090 “PublicIP:9090” you will see Prometheus UI

14. After Successfully installing Prometheus lets install Grafana also

#####################Grafana############################\
#Import the GPG key used by the Grafana package:
wget -q -O - https://packages.grafana.com/gpg.key | sudo apt-key add -
#Add the Grafana repository to the APT sources:
sudo add-apt-repository "deb https://packages.grafana.com/oss/deb stable main"
#Update the package lists:
sudo apt update
#Install Grafana:
sudo apt install grafana
#Start the Grafana service:
sudo systemctl start grafana-server
#Enable the Grafana service to start on system boot:
sudo systemctl enable grafana-server

15. If all things work fine you will see you service is running properly and after that copy the Public IP of your Instance and hit with port 3000 “PublicIP:3000” you will see Grafana UI (Note: While Installing Grafana if you see any “Warning” you can ignore it)

16. The Initial Username and Password for Grafana is “admin/admin” after login you can change it.

17. Now lets create a sample job for that click on “New Item” then Give the name select “FreeStyle Project” and save

18. Choose “Source Code Management” as “Git” and give following Git URL i.e. Opensource

https://github.com/shrihariharidass/Simple-DevOps-Project.git

19. & then “Apply & Save” run the job now for that click on “Build Now” button

20. As you can see my build was successful that means my job run now let’s go to monitor part of Jenkins

21. So go to “Mange Jenkins” and then go to “Plugins” option open that and Search of “Metrics Plugin”, ”Prometheus Metrics” & “Disk Usage Simple” and install it & restart Jenkins Once.

22. After restarting Jenkins PublicIP:8080 use metrics path as follows and you will see metrics of Jenkins

PublicIP:8080/prometheus

23. Now Open “Prometheus.yml” file where Prometheus you install and change same configuration and add below one for Jenkins

- job_name: "Jenkins Job"
    metrics_path: /prometheus/
    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ["Public Ip:8080"]