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.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Install and Configure Node Exporter on the LimeDrop Web Server
Log in to the LimeDrop web server to perform the following steps.
Create a user and group that will be used to run Node Exporter:
sudo useradd -M -r -s /bin/false node_exporterDownload and extract the Node Exporter binary:
wget https://github.com/prometheus/node_exporter/releases/download/v0.18.1/node_exporter-0.18.1.linux-amd64.tar.gztar xvfz node_exporter-0.18.1.linux-amd64.tar.gzCopy 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_exporterCreate a
systemdunit file for Node Exporter:sudo vi /etc/systemd/system/node_exporter.serviceDefine the Node Exporter service in the unit file:
[Unit] Description=Prometheus Node Exporter Wants=network-online.target After=network-online.target [Service] User=node_exporter Group=node_exporter Type=simple ExecStart=/usr/local/bin/node_exporter [Install] WantedBy=multi-user.targetStart and enable the service:
sudo systemctl daemon-reloadsudo systemctl start node_exportersudo systemctl enable node_exporterTest 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
- Configure Prometheus to Scrape Metrics from the LimeDrop Web Server
Log in to the Prometheus server to perform the following steps.
Edit the Prometheus config file:
sudo vi /etc/prometheus/prometheus.ymlLocate the
scrape_configssection and add a new entry under that section:... - job_name: 'LimeDrop Web Server' static_configs: - targets: ['10.0.1.102:9100'] ...Restart Prometheus to load the new config:
sudo systemctl restart prometheusNavigate to the Prometheus expression browser in your web browser using the public IP address of your Prometheus server:
<PROMETHEUS_SERVER_PUBLIC_IP>:9090.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"}
