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Create and Restore manual Logical Volume Snapshots

Wed, 08 May 2013 05:58:56 GMT

By creating a Logical Volume snapshots you are able to freeze a current state of any of your logical volumes. This means that you can very easily create a backup and once needed revert back to a original logical volume state. This method is very similar to what you already know from using Virtualization software such as Virtualbox or VMware where you can simply take a snapshot of entire virtual machine and revert back in case something went wrong etc. Therefore, using LVM snapshots allows you to take a control of your system's logical volumes whether it is your laptop or server. This tutorial is self-contained as no previous experience with Logical Volume Manager is required.

Configuring VNC Server Access on a Redhat Linux

Wed, 01 May 2013 05:12:18 GMT

Most of the time as a system administrator you are managing your servers over the network. It is very rare that you will need to have a physical access to any of your managed servers. In most cases all you need is to SSH remotely to do your administration task. In this article we will configure a GUI alternative to a remote access to your RHEL server, which is VNC. VNC allows you to open a remote GUI session to your server and thus providing you with a full graphical interface accessible from any remote location.

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Creating a Redhat package repository

Tue, 16 Apr 2013 01:35:32 GMT

If your Redhat server is not connected to the official RHN repositories, you will need to configure your own private repository which you can later use to install packages. The procedure of creating a Redhat repository is quite simple task. In this article we will show you how to create a local file Redhat repository as well as remote HTTP repository.

Setting Up Logrotate on RedHat Linux

Tue, 09 Apr 2013 03:41:49 GMT

Logrotate is a utility designed for administrators who manage servers producing a high volume of log files to help them save some disk space as well as to avoid a potential risk making a system unresponsive due to the lack of disk space. Normally, a solution to avoid this kind of problem is to setup a separate partition or logical volume for a /var mount point. However, logrotate may also be a viable solution to this problem especially if it is too late to move all logs under different partition. In this article we will talk about usage and configuration of logrotate on RedHat / CentOS Linux server.

An overview of GNU R programming language

Mon, 25 Feb 2013 02:31:20 GMT

The aim of this article is to provide an overview of the GNU R programming language. It starts a series of articles devoted to programming with R. Its objective is to present, in an organized and concise manner, the elementary components of the R programming language. It is designed to help you understand R code and write your own. It is assumed that the reader has already some basic programming knowledge of R. If you are not familiar with any of R features it is recommended that you first read A quick GNU R tutorial to basic operations, functions and data structures.

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WebDAV server setup on Ubuntu Linux

Wed, 20 Feb 2013 06:30:43 GMT

This article will deal with installation and configuration of WebDAV server on Ubuntu Linux. WebDAV stands for Web Distributed Authoring and Versioning and allows connected users the edit and share data online via the HTTP protocol. This makes WebDAV a popular choice for developers when combined, for example, with Subversion or OpenLink Virtuoso. WebDAV is supported by number of clients ranging from davfs2, which makes it possible to mount the WebDAV's data storage to include into the local filesystem. This can be done with the mount command to various GUI applications with the native WebDAV support such as Nautilus, konqueror, etc. Futhermore, in this guide we will combine WebDAV with the Apache2 server.

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How to encrypt a partition with Cryptoloop

Tue, 19 Feb 2013 03:32:04 GMT

This article will describe how to encrypt a partition with a Cryptoloop. Cryptoloop is a disk encryption module for Linux. It was first introduced in the 2.5.x kernel series. Cryptoloop has an ability to create an encrypted file system on a single partition or within a regular file, which can later simply be mounted by the mount command. Cryptoloop uses so called loopback device, which needs to be called with any file system request. Currently there are many alternatives for Cryptoloop usage and the most common is Loop-AES. This article will explain a simple usage of the cryptoloop module for partition encryption and mounting within a Linux Operating system.

Building basic packages in GNU R

Fri, 15 Feb 2013 10:59:13 GMT

Whether you would like to share your code and data with other people or simply pack up your code in a concise way, the ability of building a custom package in GNU R may come useful to you. In this article we will outline as clearly as possible the process of building a basic package in R. This does not include more advanced knowledge on building R packages. This tutorial, however, will get you started. You may also find How to install and use packages in GNU R of help if you are not familiar with using R packages at all.

Installation of Joomla on MariaDB and Ubuntu Linux

Wed, 13 Feb 2013 02:22:06 GMT

MariaDB is an alternative choice for a database when professionals are looking for a robust, scalable, and reliable SQL server. It is an opensource drop-in replacement for the MySQL database and behaves in the exactly same way as MySQL. In this article we will install Joomla CMS with combination of the MariaDB database and the Apache2 webserver.

How to install and use packages in GNU R

Tue, 12 Feb 2013 02:54:33 GMT

GNU R offers a wide variety of packages for its users. There are all kinds of packages for R, which allow to display graphics or perform statistical tests. Some packages are designed for applications specific to a given industry. Many packages are already a part of the basic R installation, however, some of them need to be additionally installed into GNU R. This article will describe how to install and use packages under R.