So CentOS 7 is out and there are quite some differences from it’s predecessor CentOS 6. This is why i decided to write a new how to installing Nagios Core 4.0.8 on the latest fully updated CentOS 7 minimal installation – Install Nagios on CentOS 7. The Firewalld and SELinux are both enabled and running in […]
Recently i was migrating an Apache HTTP Server (httpd) server from one linux machine to another. The problem was, that on the source linux machine Apache HTTP Server (httpd) was a custom compiled 2.4.4 and we were having constant problems when patching the linux machine (openssl libraries etc.). So we decided to replace the custom compiled Apache HTTP Server (httpd) with […]
A while ago i noticed that /var partition on a certain server was almost filled up to a 100% up and started researching what caused this. I noticed that log files in /var/log directory were not rotating. I decided to run the log rotation manually when i got this error “error: bad top line in […]
We all know CentOS – Community Enterprise Operating System as a linux distribution aiming at enterprise class community-supported computing platform. CentOS aims to be 100% compatible with it’s upstream source Red Hat Enterprise Linux (RHEL). CentOS 7 was released on 7 th of July 2014 (RHEL 7 on 10th of June 2014) and its brings some major differences from it’s […]
Zenoss is a free and open source monitoring solution similar to Nagios. It can be used to monitor all sorts of hardware and in case of failures sends out alerts to recipients. Zenoss Core provides a web interface that allows system administrators to monitor availability, inventory/configuration, performance, and events. Compared to Nagios (my personal opinion) Zenoss has alot higher […]
PostgreSQL is a database server. It is an object-relational database management system and it’s main purpose is to store data. PostgreSQL calls itself “The world’s most advanced open-source database”. It is a fact that MySQL and PostgreSQL are two most popular open-source relation database management systems (RDMS). It is up to you to choose the one you […]
OwnCloud is a free and open-source software which enables you to create a private “file-hosting” cloud. OwnCloud is similar to DropBox service with the diference of being free to download and install on your private server. Advantage of OwnCloud over DropBox is that it is private (you manage it yourself) and not limited (only limited by hard disk […]
Mobile Payment Technology Alternative payment technology is nothing new. There have been a whole range of services available for many years to carry out payments without the need for a credit card or other form of plastic. Yet, this last decade has seen an exponential rise in the proliferation of alternative payment methods. Many of […]
If you are a linux system administrator one of the more important things to learn and to know is how to manage users and groups on linux systems. This guide will describe how to add, delete and modify users and groups (manage users and groups) on CentOS 6 linux (same applies to other linux distributions) […]
We all know Apache HTTP Server. Apache is de-facto web server on UNIX-like systems and is maintained by an open community of developers of the Apache Software Foundation. Apache HTTP Server is released under the Apache License and is an open-source software. The problem with Apache HTTP Server on CentOS and other RHEL based distros is, […]
