Protect CentOS Linux system with SELinux

In many cases users simply turn off SELinux due to lack of understanding of this great security feature provided with every RedHat , CentOS , Fedora and some other Linux distributions. Another popular alternative, available on Novell’s SuSE Linux and Canonical’s Ubuntu platform, is called AppArmor. In this article we will take closer look at…

Secure Router with IP access control lists (ACLs)

In this article we will look at very basic security feature of routers and L3 switches – Access Lists At the most basic level, an access list is a list of conditions that categorize packets and because of this, they can be really helpful when you need to exercise control over network traffic. One of…

Install Nagios NRPE from source code on CentOS or Debian

In order to monitor internal resources of remote systems with Nagios you will need NRPE installed and configured on a client. There will be two pieces to install NRPE daemon and nrpe plugins. This particular install was tested with CentOS and Debian.

How to Upgrade from Debian 6 to Debian 7 Wheezy

Upgrading from Debian 6 – Squeeze to Debian 7 – Wheezy is a fairly straight forward process, but like with any upgrade things could go wrong an you have to make sure that recent backup or complete image in case of VPS is created before you start the process.

Where to find Cpanel log files

It very important to have clear understanding and reference to location of your cPanel VPS log files. This is the case in case of web attacks , security relayed issues or just good old troubleshooting. This is very basic overview of all log files used by cPanel and where they are locate.

Basic NTP Configuration on CentOS 6

It is very important to have proper time set on your VPS system. There are many reasons for this. One of them is security, all log entries must have proper time stamp for successful troubleshooting, also some networking applications will not work properly with time not set properly. On Linux time synchronization is done with…

Configure basic networking ubuntu 14.04

This tutorial was written for ubuntu 14.04 server but with slight modifications applies to most of modern Linux distributions. It describes the process of configuring your Linux systems IP address and default gateway from CLI – Command Line Interface. There are two modes of configuration temporary and permanent. The difference being temporary will not survive…

Ubuntu 12.04 and Tomcat 7 SSL implementation

Apache Tomcat is open source servlet container developed by Apache. Tomcat implements the Java Servlet and the JavaServer Pages(JSP) specifications, and provides a JAVA HTTP web server environment for Java code yo run. In this blog we will show you host how to quickly install Tomcat 7 on Ebuntu 12.04 vm or server and deploy…

Expand KVM based image with lvm partition

Lets take a quick look at how to expand kvm raw image with lvm partition running CentOS7 guest. We will need to download gparted for this to re-size image. It cam be downloaded from here. We will be expanding our image by 10G.

Deploing CentOS 7 with postfix, MailScanner, spamassassin, ClamAV as SMTP gateway

In this blog we will look into building smtp scanner gateway based on Postfix, Mailscanner , spamassassin and clamav. In this example we have CenOS 7 minimal deployed on the internal network. Perimeter firewall is setup with NAT translating public IP port 25 to internal mailscanner gateway Internal Mail server itself can run any…