Ensure apache starts on successive 'vagrant up'

[jeff1evesque]

We need to ensure apache starts on successive vagrant up. Currently, it seems apache is attempting to start before the shared directory mounts to /vagrant/webroot/:

[root@drupal-demonstration vagrant]# systemctl status httpd -l
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2016-01-20 12:26:43 EST; 58s ago

     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 1403 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 1239 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 1239 (code=exited, status=1/FAILURE)

Jan 20 7:26:43 drupal-demonstration.com systemd[1]: Starting The Apache HTTP Server...
Jan 20 7:26:43 drupal-demonstration.com httpd[1239]: AH00526: Syntax error on line 119 of /etc/httpd/conf/httpd.conf:
Jan 20 7:26:43 drupal-demonstration.com httpd[1239]: DocumentRoot '/vagrant/webroot' is not a directory, or is not readable
Jan 20 7:26:43 drupal-demonstration.com systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Jan 20 7:26:43 drupal-demonstration.com kill[1403]: kill: cannot find process ""
Jan 20 7:26:43 drupal-demonstration.com systemd[1]: httpd.service: control process exited, code=exited status=1
Jan 20 7:26:43 drupal-demonstration.com systemd[1]: Failed to start The Apache HTTP Server.
Jan 20 7:26:43 drupal-demonstration.com systemd[1]: Unit httpd.service entered failed state.
Jan 20 7:26:43 drupal-demonstration.com systemd[1]: httpd.service failed.

Note: apache starts on initial vagrant up build perfectly.

[jeff1evesque]

We can attempt to implement systemctl edit, with respect to systemd.unit. Specifically, we need to add a mountpoint as a dependency (Requires, After) to httpd.service. This method is different than opening the equivalent service file, since it knows the difference between /etc/systemd, and /usr/lib/systemd, along with how to use drop-ins (.d/).

[jeff1evesque]

We will attempt to create another systemd service, responsible telling systemd, that the /vagrant/webroot has been mounted. We will run a loop in a shell script as Type=oneshot service. This service will execute before thehttpd service, and be similar to vagrant_mounted.pp.