Category Archives: Linux (Ubuntu/CentOS)

Best Partitions (Disks) allocation: / (root has separate Disk) /boot (same disk but separate partition, not used anymore) /var (separate Disk as used massively for logs) /swap (separate Disk which is probably SSD) /home (usually separate Disk) /usr   (optional) /opt  (optional) When you want to resize any partition in Ubuntu, whether shrinking it or enlargingContinue reading “Shrink/Enlarge/Resize Ubuntu Partitions with GParted”

There are several guides for creating software RAID’s on Ubuntu on the internet. Most of them we’ve found to be not very comprehensive or difficult to understand and follow. This is why we’ve created this tutorial as easy to use as we could. Pictures on every step and detailed instructions. In fact, it may beContinue reading “Ubuntu – How to Create Software RAID 1 in 12.04 Ubuntu Linux – Tutorial”

How do I create Software RAID 1 arrays on Linux systems without using GUI tools or installer options? How do I setup RAID 1 array under Linux systems? You need to install mdadm which is used to create, manage, and monitor Linux software MD (RAID) devices. RAID devices are virtual devices created from two orContinue reading “Linux Create Software RAID 1 (Mirror) Array”

This article will demonstrate how to put multiple data disks on a General Purpose server into a RAID level 0.  We will mount a single data disk and perform read and write tests, then continue by putting two data disks into a RAID 0. A RAID 0 stripes (combines) two disks to look like one driveContinue reading “Configuring a Software RAID on a Linux General Purpose Cloud Server”

About SPF Record An SPF record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send email on behalf of your domain. It is as easy to adding as MX or A records in your DNS zone. Why It Is Important? Today, nearly all abusive e-mail messagesContinue reading “How to set up a proper mail server SPF TXT record in Bind (named) DNS server”

Postfix is a free open source mail transfer agent (MTA). It is easy to administer, fast and as well as the secure MTA. It’s an alternative to Sendmail, which is the default MTA for RHEL. Well, let us see how to setup a basic local mail server using Postfix, Dovecot and Squirrelmail On CentOS 6.5,Continue reading “Setup Local Mail Server Using Postfix, Dovecot And Squirrelmail On CentOS 6.5/6.4”

This tutorial will discuss how to set up a working mail server in Ubuntu or Debian. As we know, the two major protocols used in a mail server are SMTP and POP/IMAP. In this tutorial, postfix will be used for SMTP, whiledovecot will be used for POP/IMAP. Both are open source, stable and highly customizable.Continue reading “How to set up a mail server in Ubuntu or Debian”

You can run authconfig-gtk to get an idea of the things authconfig can modify. screenshots of GUI In general most of the information in these tabs is manipulating information under the directory /etc/sysconfig. There are a number of files there that pertain to the configuration of a RedHat based distro such as Fedora, CentOS, orContinue reading “Client auth LDAP on CentOS”

This is the continuation of our previous tutorial. In our previous tutorial we learned how to install and configure OpenLDAP server on Debian and Ubuntu systems. In this guide let us see how to a authenticate a Linux client using OpenLDAP server. This guide was tested on Debian 7 Desktop, although it will work onContinue reading “How To Configure Linux Clients To Authenticate Using OpenLDAP”

FTP server is used to exchange files between computers over network . This guide helps you to setup ftp server on centos 7 . This guide contains configuration steps for both FTP and SFTP as well as user creation . Here i’ve used VSFTP package which is secure and less vulnerable . 1. FTP ServerContinue reading “Setup FTP server on centos 7 ( VSFTP )”