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Collecting Linux Server Metrics with Prometheus

Prometheus uses a pull model to periodically scrape metric data from targets. In order to collect data, you will need to set up an entity that is able to provide metric data, and then configure the Prometheus server to scrape it. In this lab, you will walk through the process of configuring Prometheus monitoring for a Linux server.

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Path Info

Clock icon Intermediate
Clock icon 45m
Clock icon Jun 12, 2020

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Table of Contents

  1. Challenge

    Install and Configure Node Exporter on the LimeDrop Web Server

    1. Log in to the LimeDrop web server to perform the following steps.

    2. Create a user and group that will be used to run Node Exporter:

      sudo useradd -M -r -s /bin/false node_exporter
    3. Download and extract the Node Exporter binary:

      tar xvfz node_exporter-0.18.1.linux-amd64.tar.gz
    4. Copy the Node Exporter binary to the appropriate location and set ownership:

      sudo cp node_exporter-0.18.1.linux-amd64/node_exporter /usr/local/bin/
      sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter
    5. Create a systemd unit file for Node Exporter:

      sudo vi /etc/systemd/system/node_exporter.service
    6. Define the Node Exporter service in the unit file:

      Description=Prometheus Node Exporter
    7. Start and enable the service:

      sudo systemctl daemon-reload
      sudo systemctl start node_exporter
      sudo systemctl enable node_exporter
    8. Test that your Node Exporter is working by making a request to it from localhost. You should get some metric data on the screen in response to this request:

      curl localhost:9100/metrics
  2. Challenge

    Configure Prometheus to Scrape Metrics from the LimeDrop Web Server

    1. Log in to the Prometheus server to perform the following steps.

    2. Edit the Prometheus config file:

      sudo vi /etc/prometheus/prometheus.yml
    3. Locate the scrape_configs section and add a new entry under that section:

        - job_name: 'LimeDrop Web Server'
          - targets: ['']
    4. Restart Prometheus to load the new config:

      sudo systemctl restart prometheus
    5. Navigate to the Prometheus expression browser in your web browser using the public IP address of your Prometheus server: <PROMETHEUS_SERVER_PUBLIC_IP>:9090.

    6. Run the following query to verify you are able to get some metric data from the LimeDrop web server:

      node_filesystem_avail_bytes{job="LimeDrop Web Server"}

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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