OpenBSD 6.3 released ( Download of the day )

last updated in Categories Datacenter, Hardware, Howto, Networking, Open Source

OpenBSD version 6.3 has been released. OpenBSD is demonstrating to be an excellent server operating system. Security is more critical now than ever before. OpenBSD leads the pack when it comes to security features. OpenBSD provides a very robust and trustworthy system that comes with the cutting-edge security feature. OpenBSD 6.3 continues to offer the “multi-platform, ultra-secure operating system” experience. The OpenBSD team releases a new version every six months.
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Book Review: SSH Mastery – OpenSSH, PuTTY, Tunnels & Keys

last updated in Categories Open Source, Reviews, Security

Book Review: SSH Mastery
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.

Linux/Unix desktop fun: Bastet Tetris(r) clone with block-choosing AI for console

last updated in Categories Linux Games, Open Source

Xkcd - hell
Do you love the puzzle and Linux/Unix-like system? Command line? Try ncurses based Tetris clone which is harder than every other Tetris out there. From the project home page:

Have you ever thought Tetris(R) was evil because it wouldn’t send you that straight “I” brick you needed in order to clear four rows at the same time? Well Tetris(R) probably isn’t evil, but Bastet certainly is. >:-) Bastet stands for “bastard tetris”, and is a simple ncurses-based Tetris(R) clone for Linux. Unlike normal Tetris(R), however, Bastet does not choose your next brick at random. Instead, Bastet uses a special algorithm designed to choose the worst brick possible. As you can imagine, playing Bastet can be a very frustrating experience!

Book Review: Relayd and Httpd Mastery

last updated in Categories Reviews

httpd-bookThe 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.

ssh_scan: A SSH configuration and policy scanner for Linux and UNIX server

last updated in Categories Security

The SSH (“Secure Shell”) protocol is a method for secure remote login from one system to another. Sysadmins and users use a secure channel over an unsecured network in a client-server architecture format for connecting an SSH client with an SSH server. Security ssh server is an important task. There is a tool called ssh_scan from Mozilla which act as a prototype SSH configuration and policy scanner for your SSHD.

9 Awesome Open Source Web Performance Software For Linux and Unix-like Systems

last updated in Categories Open Source

Web performance is nothing but the speed in which web pages are downloaded and displayed on the user’s web browser. Faster website speeds have been shown to increase sales or increase visitor loyalty including user satisfaction. Particularly useful for those use slow internet connections or on mobile phones/tablets. You can increase the speed of page load using:

  1. Server side cache
  2. Browser side cache
  3. Faster disks
  4. Image optimization
  5. Web application accelerator focusing on optimizing caching and compression
  6. Load balancing and SSL offloading
  7. Geo or DNS-based load balancing and more.

In short, one can increase the time it takes for pages to render using multi-layered cache and asynchronous communication with server-side components. In this post, I will list my favorite open source software based TCP/HTTP load balancer and proxying solution for web performance.

A Shell Primer: Master Your Linux, OS X, Unix Shell Environment

last updated in Categories Command Line Hacks, Howto

On a Linux or Unix-like systems each user and process runs in a specific environment. An environment includes variables, settings, aliases, functions and more. Following is a very brief introduction to some useful shell environment commands, including examples of how to use each command and setup your own environment to increase productivity in the command prompt.

8 Tips to Solve Linux & Unix Systems Hard Disk Problems: Like Disk Full Or Can’t Write to the Disk

last updated in Categories Datacenter, Hardware, Storage

Can’t write to the hard disk on a Linux or Unix-like systems? Want to diagnose corrupt disk issues on a server? Want to find out why you are getting “disk full” messages on screen? Want to learn how to solve full/corrupt and failed disk issues. Try these eight tips to diagnose a Linux and Unix server hard disk drive problems.