Navigate to => system => Scheduled Cron jobs tab and paste the below command in the command input box. Run it as root and schedule the minutes as required.
Move it up the list to give it more priority. Please note replace with the xxx to your environment.

/usr/bin/env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin COLUMNS=72 /usr/local/bin/drush --root=/home/xxx/public_html --uri=http://yoursite.com/cron.php?cron_key=xxxxxxxxxx --quiet cron

It has been hit and miss for me every time I try to run deep freeze command on a number a lab machines that I managed. Therefore, this is what worked for me.

First all, you need to have a Remote desktop properly setup on your admin machines and on the other machines that you're tying to manage.
First step to wake up all the machines even if you can see them.
Second run this command:

Just copy and paste this command

I had trouble installing Drush on my newly created Centos box. Therefore, I have documented my steps.

First, you need install Composer ( PHP Dependency Manager) cd into the
$ cd /tmp

Download Composer.phar here

$ curl -sS https://getcomposer.org/installer | php

Then move it to /usr/local/bin so that it can be used globaly.
$ mv composer.phar /usr/local/bin/composer

Now type $composer

If you done everything right you should get something that look like this:

I have tried install BOA-3.0.2 to host my many Drupal sites and I have struggled a lot install it. I am hopping this write up may help someone to have better experience.

This is the description from the smart people who developed this software/script.

BOA is an acronym of high performance Barracuda, Octopus and Aegir LEMP stack.

Includes all-in-one bash scripts (see docs/INSTALL.txt for details) to install
and upgrade high performance Aegir Hosting Systems for Drupal, with Nginx, PHP-FPM, Zend OPcache, MariaDB and Redis.

What is Octopus?

First off this is not secure and it is not recommended on a production environment. There are two ways of doing this. First is by editing /usr/bin/pveproxy.
Somewhere in
my $socket = $self->create_reusable_socket(8006);
Change the port value, 8006 to your desired number, save the modification, and restart pveproxy:

sudo service pveproxy restart

This is may not available on the newer proxmox servers. Therefore, and easy way to do it by using iptables command like this:

Directory /proc/vz not found, assuming non-OpenVZ kernel
Container init failed: Cgroup is not mounted
TASK ERROR: command 'vzctl destroy 100' failed: exit code 5

TO delete just navigate to /etc/pve/nodes/xxxx/openvz/ and delete the file which has the vm number. Mine was 100.conf
$ rm 100.conf
This will completely delete the node.

If you see the below error. It is your database telling you restart me
$ service mysqld stop
$ service mysqld start
PDOException: SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction: DELETE FROM {cache_bootstrap}
WHERE (cid = :db_condition_placeholder_0) ; Array
(
[:db_condition_placeholder_0] => variables

I was once trying to mirror whole site completely. The site breaks occasionally and needed to start wget and get the rest of the files.
So here what worked for me.

Add this at the end of your custom css usually the file called style.css

img { width: 100%; }
you can also use img{display-block; width:100%;}
or
img {
display: inline-block;
height: auto;
max-width: 100%;
}

or
img {
display:block;
height: auto;
max-width: 100%;
}

Whichever works for you. Display block turns the image to a block element and will put it on its own line. Me; I just use img{width:100%;}

That is all there is to it.

Type this command
sudo rm -Rf ~/.Trash/*

To delete all Trashes

sudo rm -rf /Volumes/*/.Trashes

Copy and paste it on your command line