Updated CentOS RedHat Installation (markdown)

CentOS-RedHat-Installation.md

@@ -80,12 +80,10 @@ Replace the following variables used in above urls with your own values:</br>
 	<tr>
 		<td>CentOS_7</td>
 		<td>CentOS_6</td>
-		<td>CentOS_5</td>
 	</tr>
 	<tr>
 		<td>RHEL_7</td>
 		<td>RHEL_6</td>
-		<td>RHEL_5</td>
 	</tr>
 </table>
 
@@ -137,7 +135,13 @@ from this moment on you may get logged in to your EGroupware instance via the me
 url in egroupware-epl.log. Although, before doing that we highly do recommend to take couple of more steps to adjust couple of settings for [PHP and MyQL](https://github.com/EGroupware/egroupware/wiki/Basic-PHP-and-MySQL-Adjustments) in order to get the best performance.
 
 **Firewall and SELinux:**
-<br>CentOS-7 has its firewall by default on and it might restrict you to reaching your webserver. It's recommended to configure your firewall properly to allow access or in case you need to switch it off you may run `sudo systemctl disable firewalld`. <br/> Another restriction access might be from SELinux which is switched on by default and you need to see it properly for your environment or in case you need to set it off you may run `setenforce 1`.
+<br>CentOS-7 has its firewall by default on and it might restrict you to reaching your webserver. It's recommended to configure your firewall properly to allow access. <br/> Another restriction access might be from SELinux which is switched on by default and you need to see it properly for your environment.
+To switch both off, run the following:
+```
+systemctl disable firewalld
+sed -i 's/SELINUX=.*/SELINUX=permissive/g' /etc/sysconfig/selinux
+reboot
+```
 
 > **IMPORTANT:** *Switching off above mentioned security features could cause major security risks, please configure them properly.*
 >