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Observability with prometheus (installation)

 

How to Install Prometheus 3.0: A Beginner-Friendly Guide

Prometheus 3.0 is a robust tool for monitoring and alerting, providing insights into your system's performance. Here's a step-by-step guide to help you install and set up Prometheus on a Linux-based server.

Step 1: Prepare Your Environment

  1. Update Your System Make sure your system is up-to-date:

    sudo apt update && sudo apt upgrade -y

  2. Install Required Tools Ensure you have wget or curl installed to download Prometheus:

    sudo apt install wget curl -y

Step 2: Download Prometheus 3.0

  1. Visit the official Prometheus downloads page. Alternatively, you can use wget to download the binary directly:

    wget https://github.com/prometheus/prometheus/releases/download/v3.0.0/prometheus-3.0.0.linux-amd64.tar.gz

  2. Extract the downloaded file:

    tar -xvzf prometheus-3.0.0.linux-amd64.tar.gz
cd prometheus-3.0.0.linux-amd64

Step 3: Move Prometheus to a Suitable Location

  1. Move Prometheus and its files to /usr/local/bin/:

    sudo mv prometheus /usr/local/bin/
sudo mv promtool /usr/local/bin/

  2. Move the default configuration and libraries to /etc/prometheus:

    sudo mkdir /etc/prometheus
sudo mv prometheus.yml /etc/prometheus/

Step 4: Create a Prometheus User

To enhance security, run Prometheus under a dedicated user:

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

Update ownership of Prometheus directories:

sudo chown -R prometheus:prometheus /etc/prometheus
sudo chown prometheus:prometheus /usr/local/bin/prometheus
sudo chown prometheus:prometheus /usr/local/bin/promtool

Step 5: Configure Prometheus as a Service

  1. Create a systemd service file:

    sudo nano /etc/systemd/system/prometheus.service

  2. Add the following configuration:

    [Unit]
Description=Prometheus Monitoring System
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/ 

[Install]

 WantedBy=multi-user.target

  3. Reload systemd to apply the new service:

    sudo systemctl daemon-reload

  4. Start and enable the Prometheus service:

    sudo systemctl start prometheus
sudo systemctl enable prometheus

Step 6: Verify Installation

  1. Check the status of the Prometheus service:

    sudo systemctl status prometheus

  2. Access the Prometheus web interface: Open your browser and go to:

    Replace <your-server-ip> with your server’s IP address.

  3. http://<your-server-ip>:9090

Step 7: Configure Prometheus Targets

  1. Open the Prometheus configuration file:

    sudo nano /etc/prometheus/prometheus.yml

  2. Add or modify the scrape_configs section to include your monitoring targets:

    scrape_configs:
  - job_name: 'example-job'
    static_configs:
      - targets: ['localhost:9090']

  3. Restart Prometheus to apply changes:

    sudo systemctl restart prometheus


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