Red Hat / CentOS / Fedora – Apache – Prometheus Metrics

Guides followed:

1. https://machineperson.github.io/monitoring/2016/01/04/exporting-apache-metrics-to-prometheus.html
2. https://www.shellhacks.com/prometheus-apache-exporter-install-config-ubuntu-centos/

# Guides followed:
#      https://machineperson.github.io/monitoring/2016/01/04/exporting-apache-metrics-to-prometheus.html
#      https://www.shellhacks.com/prometheus-apache-exporter-install-config-ubuntu-centos/

# Install the needed packages
sudo yum install golang git httpd

# Create the needed environment for GOLang
mkdir ~/go
export GOPATH=$HOME/go
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

# Refresh your bash
source ~/.bashrc

# Create apache_exporter user
sudo useradd apache_exporter -s /sbin/nologin

# Create Apache Location
declare apache_exporter=$(cat <<EOF
ExtendedStatus on
<Location /server-status>
    SetHandler server-status
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Location>
EOF
)
echo "$apache_exporter"
echo -e "$apache_exporter"|sudo tee /etc/httpd/conf.d/server-status.conf

# Restart Apache
sudo systemctl restart httpd

# Validate Page
curl http://127.0.0.1/server-status

# Install the Apache exporter
go get -v github.com/Lusitaniae/apache_exporter

# sudo ln -s ~/go/bin/apache_exporter /usr/bin
sudo cp ~/go/bin/apache_exporter /usr/sbin/

# Create the service file
declare apache_exporter_service=$(cat <<EOF
[Unit]
Description=Apache Exporter

[Service]
User=apache_exporter
EnvironmentFile=/etc/sysconfig/apache_exporter
ExecStart=/usr/sbin/apache_exporter $OPTIONS

[Install]
WantedBy=multi-user.target
EOF
)
echo "$apache_exporter_service"
echo -e "$apache_exporter_service"|sudo tee /etc/systemd/system/apache_exporter.service

# Create sysconfig
sudo mkdir -p /etc/sysconfig
echo "OPTIONS=\"-scrape_uri='http://127.0.0.1/server-status/?auto'\"" | sudo tee /etc/sysconfig/apache_exporter

# OPTIONAL: Get all available options of the apache_exporter
# /usr/sbin/apache_exporter --help

# Reload the systemd
sudo systemctl daemon-reload

# Enable the new service
sudo systemctl enable apache_exporter.service

# Start the new service
sudo systemctl start apache_exporter.service

# Get status of the new service
sudo systemctl status apache_exporter.service

# View raw Prometheus metrics
curl http://localhost:9117/metrics