Linode is an original cloud platform and founded before AWS. Back then, we used to call them VPS (Virtual Private Server). Recently they added a new firewall feature to control network access to my Linode server from the Cloud. Let us test drive Linode cloud firewall. [continue reading…]
FreeBSD is a free and open source operating system for many different kinds of computers. FreeBSD’s based upon BSD, the version of UNIX developed at the University of California, Berkeley. FreeBSD is an alternative to Linux or Windows-based system. You can run almost all apps written in Perl, Python, PHP and other programming languages. FreeBSD heavily used by Netflix, EMC, IBM, Juniper, NetApp, Apple, Sony, and others. Absolute FreeBSD (3rd ed) book aims to be the complete guide to FreeBSD. Let us see why Michael W. Lucas’ FreeBSD system administration books so favorite among Unix lovers. [continue reading…]
ed is a powerful line text editor for the Linux and Unix-like systems. It was one of the first standard Unix text editor developed in 1969 by Ken Thompson. Much older and legacy Unix like system only shipped with ed for the rescue purpose. There was no vi. So learning ed might be a good idea. A low-level understanding of ed editor helps when one uses a high-level application such as vi or vim. The “Ed Mastery” book teaches you how to use the ed and forgotten art of Unix where the line-oriented paradigm is the only option. The author describe book as, “If you don’t know ed, you’re not a real sysadmin. Forty years after ed’s introduction, author Michael W Lucas has finally unlocked the mysteries of ed for everyone. With Ed Mastery, you too can become a proper Unix sysadmin.” [continue reading…]
OpenSSH needs no introduction. OpenSSH is a free and open source suite of security-related software based on the SSH protocol. OpenSSH provides secure network communication and tunneling capabilities. OpenSSH gives peace of mind when communicating with Linux or Unix-like server over the Internet on the insecure network.
SSH is essential for both sysadmins and developers. The book “SSH Mastery” (2nd ed) talks about OpenSSH server, clients, encryption, public/private keys, VPNs and other security-related network-level utilities based on the Secure Shell SSH protocol. [continue reading…]
The vim editor is a free and open source text editor. It is a clone of vi text editor. Vim is extremely popular among the Linux, macOS and Unix-like system users. Vim has many commands. It comes with a pretty extensive built-in manual too. One might get lost in the built-in manual. Let us see if “Mastering Vim Quickly From WTF to OMG in no time” can help a new or experienced vim user to increase productivity. [continue reading…]
The httpd server is a web server with FastCGI and TLS support. The relayd is a free and open source load-balancer and web-proxy server. One can use httpd and relayd to run a static website, blog, a PHP base application and so on using OpenBSD, FreeBSD, TrueOS, and HardenedBSD operating system. The book “Relayd and Httpd Mastery” talks about web server, distribute traffic between backends, running dynamic web sites, php based web apps, securing and optimizing web server, LibreSSL based modern cryptography library, TLS/SSL support and load-balancing your web traffic across multiple servers. [continue reading…]
Linux, FreeBSD, and Unix-like systems are multi-user and need some way of authenticating individual users. Back in the old days, this was done in different ways. You need to change each Unix application to use different authentication scheme. Also, authentication schemes differed between a variant of Unix systems. Porting was a nightmare. For example to use Windows Server (Active Directory) or LDAP for authentication you need to make changes to an application. Each application had its way of authenticating users. So Open Group lead to the development of PAM for the Unix-like system. Today Linux, FreeBSD, MacOS X and many other Unix-like systems are configured to use a centralized authentication mechanism called Pluggable Authentication Modules (PAM). The book “PAM Mastery” deals with the black magic of PAM. [continue reading…]
A filesystem is nothing but the data structures that an operating system uses to keep track of files on a disk. The filesystem stores pictures, music, videos, accounting data and more. The different operating system comes with various filesystems. One may need to move data between FreeBSD and other Unix-like systems like OS X or Linux based devices. Knowing all about filesystem help us to archive or move data between system. The “FreeBSD Mastery: Specialty Filesystem” is an essential, practical and well-written book. [continue reading…]
The Linux-powered device is beautiful on its own but with billions of Linux-powered devices out there it is not particularly unique. You can add stickers to your Linux powered desktop, router, and Laptop to stand out from the crowd with stickers and more. In this post I will be quickly reviewing Unixstickers.com, they claim to be the largest store for high quality and finely printed stickers, t-shirts, mugs, posters and pins on Unix, Linux, programming and software. [continue reading…]
It is always a good idea to keep backups of all of your data in multiple places. Every Linux or Unix sysadmin needs to master the art of backups if they want to keep their data forever.
Most seasoned sysadmins recommend and follow the 3-2-1 rule:
At least three copies of data
In two different formats
With one of those copies off-site
What is a Tarsnap service?
A Tarsnap service is a secure online backup system for Linux, OSX, *BSD or UNIX-like system. They encrypt and store data in Amazon S3. The services also use rsync-like algorithms, and only backup data that has been changed since the last dump. The backups are protected by a security key only known to a backup operator or sysadmin.
Tarsnap Mastery book
To use Tarsnap perfectly and feel secure about your backups, I recommend the “Tarsnap Mastery” book by Michael W. Lucas. It is no secret that I’m a big fan of his book series and this book didn’t disappoint. [continue reading…]