In this blog, we will cover how to install Prometheus.

Following are the three ways to run the Prometheus

1. Script.

2. Systemd service.

3. Docker container.

   This blog will cover only two methods run as a script and systemd service.

Environment used:

RAM=2GB

CPU=2cores

Disk=20GB free

OS= RHEL9

1. Run as a script

Prometheus supports multiple Operating Systems so, we can download the Prometheus files as per the OS and architecture.

1. Download the Prometheus using wget command.

   Download Prometheus

   https://github.com/prometheus/prometheus/releases/download/v2.40.5/prometheus-2.40.5.linux-amd64.tar.gz

2. Extract the TAR file.

    tar -xvf prometheus-2.40.5.linux-amd64.tar.gz
   

3. Run Prometheus

./prometheus

1. Access the Prometheus UI

   http://IPaddress or hostname:9090/

   example: http://192.168.0.102:9090/

2. Run as a systemd service.

1. Download the Prometheus using wget command.

   https://github.com/prometheus/prometheus/releases/download/v2.40.5/prometheus-2.40.5.linux-amd64.tar.gz

2. Extract the TAR file.

    tar -xvf prometheus-2.40.5.linux-amd64.tar.gz
   

3. Create user, directories and change ownership.

    useradd --no-create-home -s /bin/false prometheus
    mkdir /etc/prometheus       ## configuration file
    mkdir /var/lib/prometheus   ## libraries 
    chown prometheus:prometheus /etc/prometheus
    chown prometheus:prometheus /var/lib/prometheus
   

4. copy extracted files to /var/lib/prometheus

    cp -r prometheus-2.40.5.linux-amd64/* /var/lib/prometheus/
   

5. Change ownership.

    chown -R prometheus:prometheus /var/lib/prometheus
   

6. Move config file to /etc/prometheus

    mv /var/lib/prometheus/prometheus.yml /etc/prometheus/
   

7. Check configuration file

    grep -v '#' /etc/prometheus/prometheus.yml
   

8. Create a symbolic link for Prometheus at /usr/bin directory to make it globally executable from any path.

     cp -s /var/lib/prometheus/prometheus /usr/bin
     cp -s /var/lib/prometheus/promtool /usr/bin
   

9. Create Systemd Service Unit:-

    vim /usr/lib/systemd/system/prometheus.service
   
    [Unit]
    Description=Prometheus
    Wants=network-online.target
    After=network-online.target
   
    [Service]
    User=prometheus
    Group=prometheus
    Type=simple
    ExecStart=/usr/bin/prometheus \
    --config.file /etc/prometheus/prometheus.yml \
    --storage.tsdb.path /var/lib/prometheus/ \
    --web.console.templates=/var/lib/prometheus/consoles \
    --web.console.libraries=/var/lib/prometheus/console_libraries
   
    [Install]
    WantedBy=multi-user.target
   

10. Configure the firewall if you have enabled it.

    firewall-cmd --permanent --add-port=9090/tcp
    firewall-cmd --reload
    

11. Enable and start service.

    systemctl enable --now prometheus.service
    

12. Access the prometheus UI

    http://IPaddress or hostname:9090/

    example: http://192.168.0.102:9090/

Follow the each and every steps carefully to successfull installation.