Setup a mail server with Postfix and Dovecot on Ubuntu / Debian

Mail system for your own domain You have your own domain name and your very own vps/dedicated server and want to use the domain name for emails. So you need to setup a mail server using an smtp server and an imap/pop server. This tutorial shows you how to setup Postfix (smtp server) and Dovecot (imap/pop server). The task of the smtp ...

Send mail from command line with external smtp server on Linux

Send mail via SMTP servers The default mail command on the Linux terminal, uses the local smtp server (mta) on port 25 to transmit emails. However at times you need to specify an external smtp server to use for sending mails. For example you have just setup an smtp server, like Postfix or Exim, then you would want to test it out ...

9 mail/mailx command examples to send emails from command line on Linux

Send mails from command line The mail command is an essential one that should be available on any linux server so that various services and other web applications can generate and transmit emails. In a previous we saw how the mail command can be used to send emails from the command line on your linux server. In this tutorial we shall be ...

Test read/write speed of usb and ssd drives with dd command on Linux

Drive speed The speed of a drive is measured in terms of how much data it can read or write in unit time. The dd command is a simple command line tool that can be used to read and write arbitrary blocks of data to a drive and measure the speed at which the data transfer took place. In this post we ...

How to fix Virtualbox error “Kernel driver not installed (rc=-1908)” on Ubuntu

Virtualbox I recently installed the latest version of Virtualbox (4.3.12) by downloading the deb files from virtualbox.org on Ubuntu 14.04. The installation goes fine, but when trying to run Virtualbox, it reports the following error. Kernel driver not installed (rc=-1908) The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module ...

How to check processor and cpu details on Linux

Processor/Cpu details The details about the processor that we shall be talking about include, number of cores, availability of hyper threading, architecture, cache size etc. To find these details about the cpu on your system can be a bit difficult because the way different commands check them. The commands that we are going to use include lscpu, /proc/cpuinfo and lstopo (hwloc). They ...

How to disable Ipv6 on Ubuntu, Linux Mint, Debian

Ipv6 Ipv6 is the next version of the addressing scheme Ipv4 that is currently being used to assign numerical address to domain names like google.com over the internet. Ipv6 allows for more addresses than what Ipv4 supports. However it is not yet widely supported and its adoption is still in progress. Does your system support ipv6 ? For Ipv6 to work for you, there ...

20 things to do after installing Elementary OS 0.2 Luna

Elementary OS Luna Elementary OS is another very cool linux distro based on Ubuntu. It has an intense focus on visual design and user experience. It comes with its own desktop environment called Pantheon that is designed to resemble mac. In this post we are going to tweak elementary OS right after a fresh installation and also install some essential apps to ...

9 commands to check hard disk partitions and disk space on Linux

In this post we are taking a look at some commands that can be used to check up the partitions on your system. The commands would check what partitions there are on each disk and other details like the total size, used up space and file system etc. Commands like fdisk, sfdisk and cfdisk are general partitioning tools that can not ...

20 things to do after installing Linux Mint 17 Qiana Cinnamon

Linux Mint 17 Qiana Cinnamon Linux Mint 17 has been released and is named Qiana. Mint is one of the best linux distros that targets desktop users with focus on usability and simplicity. It comes in various flavors with different desktop environments like Mate and Cinnamon and different base distros like Ubuntu or Debian. In this post we are playing with the ...

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