How to install and configure Prometheus on CentOS 7

Prometheus is a complete monitoring and trending system with built-in and active scraping, storing, querying, graphing and alerting based on time series data.

Prometheus is an open-source toolkit initially built at SoundCloud for monitoring and alerting. The toolkit is now a standalone open source project and maintained independently of any company.

The toolkit collects metrics from monitored targets by scrapping HTTP endpoints on those targets. Most Prometheus components are in Go. Some written in Java, Python, and Ruby.

Prometheus works well to record any numerical time series. It fits both machine-centric monitoring and high-dynamic service-oriented architecture monitoring. In addition to making it easier to run and integrate into your environment, Prometheus offers a rich data model and query language.

The following tutorial shows steps to install Prometheus on CentOS.

Install and Configure Prometheus on CentOS 7

Login to Terminal as root, and start firing the commands below.

Step 1 – Update System

yum update -y

Step 2 –  Disable SELinux

Open SELinux configuration and edit the file:

vim /etc/sysconfig/selinux

Change “SELINUX=enforcing” to “SELINUX=disabled”.

Save and exit the file. Then reboot the system.

reboot

Step 3 –  Download Prometheus package

Go to official Prometheus downloads page, and copy the URL of Linux “tar” file.

Prometheus Download Page
Prometheus Download Page

Run the following command to download package. Paste the copied URL after wget in the below command:

wget https://github.com/prometheus/prometheus/releases/download/v2.8.1/prometheus-2.8.1.linux-amd64.tar.gz

Step 4 – Configure Prometheus

Add a Prometheus user.

useradd --no-create-home --shell /bin/false prometheus

Create needed directories.

mkdir /etc/prometheus
mkdir /var/lib/prometheus

Change the owner of the above directories.

chown prometheus:prometheus /etc/prometheus
chown prometheus:prometheus /var/lib/prometheus

Now go to Prometheus downloaded location and extract it.

tar -xvzf prometheus-2.8.1.linux-amd64.tar.gz

Rename it as per your preference.

mv prometheus-2.8.1.linux-amd64 prometheuspackage

Copy “prometheus” and “promtool” binary from the “prometheuspackage” folder to “/usr/local/bin”.

cp prometheuspackage/prometheus /usr/local/bin/
cp prometheuspackage/promtool /usr/local/bin/

Change the ownership to Prometheus user.

chown prometheus:prometheus /usr/local/bin/prometheus
chown prometheus:prometheus /usr/local/bin/promtool

Copy “consoles” and “console_libraries” directories from the “prometheuspackage” to “/etc/prometheus folder”

cp -r prometheuspackage/consoles /etc/prometheus
cp -r prometheuspackage/console_libraries /etc/prometheus

Change the ownership to Prometheus user

chown -R prometheus:prometheus /etc/prometheus/consoles
chown -R prometheus:prometheus /etc/prometheus/console_libraries

Add and modify Prometheus configuration file.

Configurations should be added to the  “/etc/prometheus/prometheus.yml”

Now we will create the prometheus.yml file.

vim /etc/prometheus/prometheus.yml

Add the following configuration to the file.

global:
  scrape_interval: 10s

scrape_configs:
  - job_name: 'prometheus_master'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9090']

save and exit the file

Change the ownership of the file.

chown prometheus:prometheus /etc/prometheus/prometheus.yml

Configure the Prometheus Service File.

vim /etc/systemd/system/prometheus.service

Copy the following content to the file.

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

[Service]
User=prometheus
Group=prometheus
Type=simple
ExecStart=/usr/local/bin/prometheus \
--config.file /etc/prometheus/prometheus.yml \
--storage.tsdb.path /var/lib/prometheus/ \
--web.console.templates=/etc/prometheus/consoles \
--web.console.libraries=/etc/prometheus/console_libraries

[Install]
WantedBy=multi-user.target

Save and the exit file.

Reload the systemd service.

systemctl daemon-reload

Start the Prometheus service.

systemctl start prometheus

Check service status.

systemctl status prometheus

Status
Status

Add firewall rules.

firewall-cmd --zone=public --add-port=9090/tcp --permanent

Reload firewall service.

systemctl reload firewalld

Step 5 – Access Prometheus Web Interface

Use the following Url to access UI.

http://Server-IP:9090/graph

Then you can see the following interface.

UI
UI

Step 6 – Monitor Linux Server Using Prometheus

First, you need to configure Prometheus node exporter on a Linux server.

Copy URL of the Node Exporter form the official download page.

Node Exporter Download
Node Exporter Download

Paste the copied URL after wget in the following command:

wget https://github.com/prometheus/node_exporter/releases/download/v0.17.0/node_exporter-0.17.0.linux-amd64.tar.gz

Node Exporter
Node Exporter

Extract the downloaded package.

tar -xvzf node_exporter-0.17.0.linux-amd64.tar.gz

Create a user for the node exporter.

useradd -rs /bin/false nodeusr

Move binary to “/usr/local/bin” from the downloaded extracted package.

mv node_exporter-0.17.0.linux-amd64/node_exporter /usr/local/bin/

Create a service file for the node exporter.

vim /etc/systemd/system/node_exporter.service

Add the following content to the file.

[Unit]
Description=Node Exporter
After=network.target

[Service]
User=nodeusr
Group=nodeusr
Type=simple
ExecStart=/usr/local/bin/node_exporter

[Install]
WantedBy=multi-user.target

Save and exit the file.

Reload the system daemon.

systemctl daemon-reload

Start node exporter service.

systemctl start node_exporter

Add a firewall rule to allow node exporter.

 firewall-cmd --zone=public --add-port=9100/tcp --permanent

Reload firewall service.

systemctl restart firewalld

Enable node exporter on system boot.

systemctl enable node_exporter

View the metrics browsing node exporter URL.

http://IP-Address:9100/metrics

Node Exporter Metrics
Node Exporter Metrics

Add configured node exporter Target On Prometheus Server.

Login to Prometheus server and modify the prometheus.yml file

Edit the file:

vim /etc/prometheus/prometheus.yml

Add the following configurations under the scrape config.

 - job_name: 'node_exporter_centos'
    scrape_interval: 5s
    static_configs:
      - targets: ['10.94.10.209:9100']

The file should look like as follows.

Modified File
Modified File

Restart Prometheus service.

systemctl restart prometheus

Login to Prometheus server web interface, and check targets.

http://Prometheus-Server-IP:9090/targets

Added Target
Added Target

You can click the graph and query any server metrics and click execute to show output. It will show the console output.

Query Browser:

Select Query
Select Query

Console output:

Memory Console Output
Memory Console Output

Click Graph to view.

Memory Graph
Memory Graph

Step 7 – Monitor MySQL Server Using Prometheus

Login to MySQL and execute the following queries.

CREATE USER 'mysqlexporter'@'localhost' IDENTIFIED BY 's56fsg#4W2126&dfk' WITH max_user_connections 2;
GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'mysqlexporter'@'localhost';
FLUSH PRIVILEGES;

Download mysqld_exporter from the official download page.

Mysqld Exporter
Mysqld Exporter

wget https://github.com/prometheus/mysqld_exporter/releases/download/v0.11.0/mysqld_exporter-0.11.0.linux-amd64.tar.gz

Extract the Downloaded file.

tar -xvzf mysqld_exporter-0.11.0.linux-amd64.tar.gz

Add a user for mysqld_exporter.

useradd -rs /bin/false mysqld_exporter

Copy mysqld_exporter file to /usr/bin.

 mv mysqld_exporter-0.11.0.linux-amd64/mysqld_exporter /usr/bin

Change ownership of the file.

chown mysqld_exporter:mysqld_exporter /usr/bin/mysqld_exporter

Create needed folders.

mkdir -p /etc/mysql_exporter

Create a MySQL password file for mysqld_exporter.

vim /etc/mysql_exporter/.my.cnf

Add the following configurations to the file.

[client]
user=mysqlexporter
password=sdfsg#4W2126&gh

Save and exit the file.

Change ownership.

chown -R mysqld_exporter:mysqld_exporter /etc/mysql_exporter

Grant needed permission.

chmod 600 /etc/mysql_exporter/.my.cnf

Create a service file.

vim /etc/systemd/system/mysql_exporter.service

Add the following content to the file.

[Unit]
Description=MySQL Server fosslinux
After=network.target

[Service]
User=mysqld_exporter
Group=mysqld_exporter
Type=simple
ExecStart=/usr/bin/mysqld_exporter \
--config.my-cnf="/etc/mysql_exporter/.my.cnf"
Restart=always

[Install]
WantedBy=multi-user.target

Reload the system daemon.

 systemctl daemon-reload

Enable mysql_exporter on system boot.

systemctl enable mysql_exporter

Start service.

systemctl start mysql_exporter

View the metrics using the following URL.

http://Server_IP:9104/metrics

View Metrics
View Metrics

Now go to Prometheus server and modify the prometheus.yml file.

 vim /etc/prometheus/prometheus.yml

Add the following content to the file.

- job_name: 'mysql_exporter_fosslinux'
    scrape_interval: 5s
    static_configs:
      - targets: ['10.94.10.204:9104']

Edited File
Edited File

Restart Prometheus.

 systemctl restart prometheus

You can see added targets by clicking targets under the status.

http://IP:9090/targets

All Targets
All Targets

Now you can select query using query browser and get the result of MySQL server.

That’s all about the installation and configuration of Prometheus server on CentOS 7. Hope you enjoyed this tutorial. Let us know your feedback in the comments below.

Darshana
Hey! I'm Darshana, a Linux / DevOps Engineer and also a contributor to FOSS Linux. I enjoy working on various kind of Linux distributions and cloud technologies. During my free time, I love to swim and hike across nature trails. Linux is my love and I'm here to share all my learnings with all of you! Hope you enjoyed reading my article.

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