Grafana dashboard: Dashboard - Apache Web Server
Description: Apache Web Server - Prometheus Dashboard Metrics server-status HTTPD 

### Requerimientos.

* Acceso remoto desde el nodo server "Prometheus" al servidor Cliente por el puerto 9117 TCP.

* Tener instalado el plugin node_exporter (https://prometheus.io/download/).

+ Revisar la documentación de Apache Modulo Status (https://httpd.apache.org/docs/current/mod/mod_status.html)


### Instrucciones
Ejecutar el paso a paso de instalación y habilitación del plugin ó ejecutar script para instalar todos los pasos.

### 1.-Descargar la ultima versión del plugins de monitoreo desde la url : 
+ https://github.com/Lusitaniae/apache_exporter

### 2.- Crear usuario para ejecutar el servicio.
+ sudo groupadd --system apache_exporter 
+ sudo useradd -s /bin/false -r -g apache_exporter apache_exporter

### 3.- Descomprimir el archivo descargado, ingresar a la carpeta y asignar permisos.
+ tar xvf apache_exporter-.linux-amd64.tar.gz 
+ cd apache_exporter-.linux-amd64 
+ sudo chmod +x apache_exporter 
+ sudo chown apache_exporter.apache_exporter apache_exporter

### 4.- Mover el archivo binario a la ruta de ejecución en el Sistema Operativo.

+ sudo mv apache_exporter /usr/local/bin/

### 5.- Crear archivo para servicio en systemctl llamado apache_exporter.service.

+ sudo nano /etc/systemd/system/apache_exporter.service

###-------------------------------------------------------------------------

+ sudo cat <<EOF>> /etc/systemd/system/apache_exporter.service
+ [Unit] Description=Apache Exporter After=network.target

+ [Service] 
+ User=apache_exporter 
+ Group=apache_exporter 
+ Type=simple 
+ ExecStart=/usr/local/bin/apache_exporter

+ [Install] WantedBy=multi-user.target 
+ EOF 

###-------------------------------------------------------------------------


### 6.- Recargar el demonio del sistema, habilitar servicio para iniciar si existe un reinicio del sistema operativo.
+ sudo systemctl daemon-reload sudo systemctl enable apache_exporter.service

### 7.- Permisos

+ sudo semanage fcontext -a -t bin_t '/usr/local/bin/apache_exporter' 
+ sudo chcon -Rv -u system_u -t bin_t '/usr/local/bin/apache_exporter'

### 8.- Detener, Iniciar y chequear el estatus del servicio node exporter.

+ sudo systemctl stop apache_exporter.service 
+ sudo systemctl start apache_exporter.service 
+ sudo systemctl status apache_exporter.service

### 9.- Chequear la versión instalada.

+ apache_exporter --version

### 10.- Verificar las métricas ya recopiladas por apache_exporter.

+ curl http://localhost/server-status

### 11.- Crear en el servidor Prometheus el "job" con la siguiente configuración para monitorear el servidor cliente. Editar el archivo "/etc/prometheus/prometheus.yml" .

+ job_name: 'apache_exporter' 
+ scrape_interval: 5s 
+ static_configs:
+ targets:
+ '<$IP_apache_exporter>:9117' 
+ labels: 
+ env: "$ENV"

### 12.- Habilitar mod_status en servicio Web Server Apache "HTTPD" en la ruta: "/etc/httpd/conf/httpd.conf". Descomentar (eliminar carácter #) en la linea referente al modulo.

+ LoadModule status_module modules/mod_status.so

### 13.- Crear archivo "apache_exporter.conf" en la ruta: "/etc/httpd/conf.d" para el servicio Web Server Apache "HTTPD". Habilitar las estadísticas (Solo solo locales).

+ ExtendedStatus on

+ <Location /server-status> 
+ SetHandler server-status 
+ Order deny,allow 
+ Deny from all 
+ Allow from localhost 
+ </Location>

### 14.- Reinicio del servicio httpd "Web Server Apache" para que considere los cambios realizados.

+ systemctl restart httpd

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