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VPN setup
VPN is one of the way to encrypt data via a network. This article will guide you to setup PPTP VPN server using Ubuntu. There are many type of VPN but PPTP still a popular choice due to easy installation. We will be using Ubuntu as the VPN server, but basically the method is the same if you’re using …

I have plan to create MySQL cluster with 2 management nodes. If you read my article before regarding MySQL cluster, we are just using one management node. How about if we require more management node in case the primary management node require maintenance or shutdown.
The configuration is different this time. It is because, there are two management nodes. And also …

HAProxy is a free Open Source software act as a load balancer and proxy for TCP and HTTP application such as Apache. HAProxy was written in 2000 by Willy Tarreau,a core contributor to the Linux kernel, who still maintains the project. In this article we will setup HAProxy on a Centos 7. Previously we have setup MySQL clustering on Centos …

MySQL cluster topology
MySQL cluster is the type of database technology that using a cluster of MySQL server to achieved high availability and high throughput but still maintaining a very low latency. MySQL cluster using different database engine which is NDBCLUSTER.
In order to deploy MySQL cluster we test using 5 servers with 3 types of node. The management node, the Data …

QNX  RTOS (pronounced either Q-N-X or Q-nix) is a commercial POSIX-compliant Unix-like real-time operating system, aimed primarily at the embedded systems market. As of September 12 2007, the source of the QNX kernel has been released for non-commercial use.

Description
As a microkernel-based OS, QNX operating system is based on the idea of running most of the OS in the form of …

Centos Logo
Repair duplicate rpm package is not an easy task. In this post we will learn on how to repair duplicate rpm in Centos system. Before this we have learn how to recover wrongly set permission on Centos 7.
Recently I have encounter problem with duplicate rpm issue in one of my server using Centos. The problem was caused by sudden …