How to Integrate Grafana with Prometheus for Monitoring

Grafana is a free and opensource tool for querying, analyzing and visualizing metrics from an array of multiple data sources whether physical or from the cloud. With Grafana, you can create, explore and share beautiful and intuitive dashboards from different data sources without a hassle. Some of the data sources it connects with include MySQL server, Graphite, PostgreSQL, InfluxDB, Elasticsearch, and Prometheus. In this guide, we will demonstrate how you can integrate Prometheus with Grafana. But first, we are going to Install Grafana. Check out our previous topic to see how you can install Prometheus on CentOS 8.

Installing Grafana on CentOS 8 / RHEL 8

We are going to install Grafana from the YUM/ DNF repository as it is much easier compared to downloading and running the .rpm package.

Step 1) Enable the DNF (or Yum) repository for Grafana

To begin with, add Grafana’s yum repository by creating a repository file as shown as root user

[[email protected] ~]# vi /etc/yum.repos.d/grafana.repo
[grafana]
name=grafana
baseurl=https://packages.grafana.com/oss/rpm
repo_gpgcheck=1
enabled=1
gpgcheck=1
gpgkey=https://packages.grafana.com/gpg.key
sslverify=1
sslcacert=/etc/pki/tls/certs/ca-bundle.crt

save and exit the file

Run below dnf command to view all enabled package repositories, in the output we should see Grafana repository too.

[[email protected] ~]# dnf repolist

dnf-repolist-grafana-centos8

Step 2)  Install Grafana Monitoring tool

To install Grafana, use the DNF package manager as follows:

[[email protected] ~]# dnf install grafana -y

You can verify that Grafana is installed using the rpm command as shown

[[email protected] ~]# rpm -qa | grep grafana
grafana-6.5.2-1.x86_64
[[email protected] ~]#

To gather more information about Grafana such as the version, architecture and license, run the command:

[[email protected] ~]# rpm -qi grafana

grafana-rpm-qf-centos8

Step 3) Start and enable Grafana service

With Grafana successfully installed, we need to start the Grafana service and ensure it is running. So to start Grafana, run the command:

[[email protected] ~]# systemctl daemon-reload
[[email protected] ~]# systemctl start grafana-server

To enable Grafana on boot run:

[[email protected] ~]# systemctl enable grafana-server

You can verify that Grafana is running by executing the command:

[[email protected] ~]# systemctl status grafana-server

Grafana-service-status-centos8

Additionally, you can use the netstat command to verify if Grafana is listening on its default port, which is port 3000.

grafana-port-netstat-output-centos8

Step 4) Open the port for Grafana in the Firewall

If you have a firewall running on your system, you need to allow port 3000 for external users to access Grafana on the browser. To open port 3000, execute the command:

[[email protected] ~]# firewall-cmd --add-port=3000/tcp --permanent
success
[[email protected] ~]#

Then reload the firewall to effect the changes

[[email protected] ~]# firewall-cmd --reload
success
[[email protected] ~]#

Step 5) Accessing Grafana

With all the configuration done, head over to your browser and visit your Grafana server’s URL as shown:  http://server-ip:3000/

Grafana-Login-Page-CentOS8

Login using the default credentials as shown:

  • Username: admin
  • Password: admin

Grafana will then prompt you to set a strong password for obvious reasons. Type the new password and confirm it and finally click on the ‘Save’ button to save the changes made to your password.

Change-Password-Grafana-Admin-User

This ushers you to Grafana’s dashboard.

Grafana-Dashboard-CentOS8

We have successfully installed the Grafana monitoring server. Now it’s time to switch gears and integrate Grafana with the Prometheus server which we installed in our last topic.

Integrate Grafana with Prometheus for Monitoring

While Prometheus can display accurate system metrics, Grafana is the better of the two giving you intuitive and visually appealing dashboards that display a wide array of metrics as you will see. Additionally, you can customize, query and save the dashboards and even share them with other users.

In this section, we demonstrate how you can integrate Prometheus with Grafana. On the dashboard, click on the  ‘Add data source’ option

Add-Source-Grafana-Dashboard

A list of data sources will be displayed that you can integrate with. Because we are interested in Prometheus integration, simply click on the ‘Prometheus’ option

Add-Prometheus-Grafana-Dashboard

Type the Prometheus server address in the URL text field

http://prometheus-server-ip:9090/

Prometheus-Server-Settings-Grafana

Click the  ‘Save and Test’ button and you should get the output indicating ‘Data source is working’.

Data-Source-Working-Grafana

To create a dashboard for visualizing metrics, click on the plus sign on the left sidebar and click on ‘import

Import-Data-Grafana-Dashboard

You will be required to fill out the URL of a dashboard from Grafana’s repository. So, head out to Grafana’s official dashboards page and right-click on a node_exporter dashboard ( I have selected the first one because of its good reviews and many downloads) and copy its link.

discover-share-dashboards-Grafana

Paste the link in the URL section

Grafana-Prometheus-dashboard-Jason

Once you paste the link, wait a few seconds and the data below will be generated. Change the Prometheus Data Source Name as “Prometheus-1” and then Click on ‘Import

Import-Dashboard-Grafana-Json-File

Grafana will begin fetching the metrics from the Prometheus server and visualize then in colorful and intuitive dashboards.

Node-Exporter-Prometheus-Dashboard-Grafana

You can select a dashboard for a specific component and view it on full screen mode.

Specific-Component-Dashboard-Grafana

This wraps up our tutorial today, We hope you can now integrate Prometheus and Grafana and enjoy stunning and beautiful visualizations.

1 Response

  1. Samon says:

    Superb post…Made my life much easier

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