Apache 2 MPM Event with PHP-FPM, FCGID and SUEXEC on Debian Jessie

The goal of this setup is having a high-performance state-of-the-art deployment of Apache and PHP while being compatible with legacy applications.

Apache Event MPM engine handles requests asynchronously, instead of using a dedicated thread or process per request.
PHP-FPM is a FastCGI process manager included in modern versions of PHP. Compared to FCGID it provides better process management features and enables the OPCache to be shared between workers.
FCGID and SuEXEC are used for legacy apps that need older versions of PHP (i.e. PHP 5.2 or PHP 4)

Sources:

Source http://wiki.apache.org/httpd/PHP-FPM

Related:

Install the machinery

apt-get update
apt-get install apache2-mpm-event php5-fpm libapache2-mod-fcgid apache2-suexec-custom php5-cgi

TODO libapache2-mod-auth-pam is no longer part of the debian distribution,

replace with libapache2-mod-authnz-external pwauth

Enable some convinient Apache modules

a2enmod suexec
a2enmod ssl
#a2enmod auth_pam
a2enmod proxy_fcgi

Configure suexec-custom

sed -i "s#/var/www#/home#" /etc/apache2/suexec/www-data
sed -i "s#public_html#webapps#" /etc/apache2/suexec/www-data

Create logs directory for virtualhosts

mkdir -p /var/log/apache2/virtual/
chown -R www-data:www-data /var/log/apache2

Restart Apache
```
service apache2 restart
```

ExecCGI

<Directory /home/*/webapps/>
    Options +ExecCGI
</Directory>

Permissions <Directory /home/*/webapps> Require all granted

TODO pool per website or pool per user? memory consumption

events.mechanism = epoll

TODO multiple master processes, opcache is held in master, and reload/restart affects all pools

http://mattiasgeniar.be/2014/04/09/a-better-way-to-run-php-fpm/

TODO CHRoot https://andrewbevitt.com/tutorials/apache-varnish-chrooted-php-fpm-wordpress-virtual-host/

```bash
echo '
[vhost]
istemplate = 1
listen.mode = 0660
pm = ondemand
pm.max_children = 5
pm.process_idle_timeout = 10s
pm.max_requests = 200
' > /etc/php5/fpm/conf.d/vhost-template.conf
```

```bash
mkdir -p /var/run/fpm/socks/
chmod 771 /var/run/fpm/socks
chown orchestra.orchestra /var/run/fpm/socks
```

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