Cpanel/Easyapache:

bash < (curl -s https://raw.githubusercontent.com/cloudflare/mod_cloudflare/master/EasyApache/installer.sh)

Nginx:

https://support.cloudflare.com/hc/en-us/articles/200170706-How-do-I-restore-original-visitor-IP-with-Nginx-

define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

mine service example:

define service{
use generic-service
host_name station10
service_description Root_Monitoring
contact_groups admins
check_command check_nrpe!check_disk!5%!10%!/
max_check_attempts 8
}

mysqldump: Error 2020: Got packet bigger than ‘max_allowed_packet’ bytes when dumping table:

need to add --max_allowed_packet option to command:
mysqldump --max_allowed_packet=512M some_db >> /root/some_db.sql

#find / -xdev -printf '%h\n' | sort | uniq -c | sort -k 1 -n

/sbin/rcvboxdrv setup -> Bad argument setup (:
how to fix
# /usr/lib/virtualbox/vboxdrv.sh setup
Stopping VirtualBox kernel modules ...done.
Recompiling VirtualBox kernel modules ...done.
Starting VirtualBox kernel modules ...done.