There are some excellent instructions for hand editing the network scripts.
Transparent Huge Pages (THP) was introduced in RHEL 6. However, it wasn't turned on by default until RHEL 7.
RHEL/CentOS/Scientific Linux 7 has stopped using iptables and start now using firewalld which provides a dynamically managed firewall.
To convert a ppk file to something ssh can use.
It took my a while of searching before I found this mailing list entry that gave me really good instructions on how to manually show what triggered URIBL_SBL.
Simple and straight forward.
# dig +short myip.opendns.com @resolver1.opendns.com
Based on an Article at http://dougsland.livejournal.com/121262.html
yum: prevent a package to be updated in your system
1) Enable the yum-plugin-versionlock
This is based on some excellent information from http://serverfault.com/questions/286159/how-to-disabled-password-authentication-for-specific-users-in-sshd
I wrote the original article based on Zabbix 1.8.4 and the template was missing some steps so I am updating the template adding some triggers to the template.
Some useful bash commands to parser Postfix logs.