Collecting Application Metrics with Prometheus

Prometheus exporters allow you to collect metric data from a variety of sources. You can monitor not only your servers but also the applications running on your servers. In this lab, you will have the opportunity to explore application monitoring in Prometheus by setting up monitoring for an application process and pulling application metric data into a Prometheus server.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install and Configure the Apache Exporter

Create a user for the Apache exporter:

sudo useradd -M -r -s /bin/false apache_exporter

Download and install the Apache exporter binary:

wget https://github.com/Lusitaniae/apache_exporter/releases/download/v0.7.0/apache_exporter-0.7.0.linux-amd64.tar.gz

tar xvfz apache_exporter-0.7.0.linux-amd64.tar.gz

sudo cp apache_exporter-0.7.0.linux-amd64/apache_exporter /usr/local/bin/

sudo chown apache_exporter:apache_exporter /usr/local/bin/apache_exporter

Create a systemd unit file for Apache exporter:

sudo vi /etc/systemd/system/apache_exporter.service

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

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

[Install]
WantedBy=multi-user.target

Start and enable the apache_exporter service:

sudo systemctl enable apache_exporter

sudo systemctl start apache_exporter

Verify the service is running and that it is serving metrics:

sudo systemctl status apache_exporter

curl localhost:9117/metrics

Configure Prometheus to Scrape Metrics from the Apache Exporter

Log in to the Prometheus server.
Edit the Prometheus config:
```
sudo vi /etc/prometheus/prometheus.yml
```

Under the scrape_configs section, add a scrape configuration for the Apache exporter:

- job_name: 'Apache Server'
  static_configs:
  - targets: ['limedrop-apache:9117']

Restart Prometheus to load the new configuration:
```
sudo systemctl restart prometheus
```
Use the expression browser to verify you can see Apache metrics in Prometheus. You can access expression browser in a web browser at http://<PROMETHEUS_SERVER_PUBLIC_IP>:9090.
Run a query to view some Apache metric data:
```
apache_workers
```

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Collecting Application Metrics with Prometheus

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Learning Objectives

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