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git simplified – part 1
Reading time: 5 minutes
Doing any coding without some kind of versioning control system ( VCS ) is nearly impossible today. Thanks to his creator, Linus Torvalds, we have a great distributed system that is pretty easy to start with, however very hard to master. Think of GIT as a tool that you will be constantly learning as you...
Importing vQFX to GNS3
Reading time: 6 minutes
Introduction This blog post is intended as a foundation, that will help you getting started creating bigger and more complex topologies in GNS3, using Juniper vQFX switch(es). We will put together a simple topology with two vQFX switches, configure interfaces and test connectivity between them. Details about environment and software used: – Host machine running...
Peering Decisions on the Internet
Reading time: 3 minutes
Intro to peering decisions To make better peering decisions, we need to analyze the peering components. Peering is as simple as two networks / providers agreeing to exchange traffic. Since the exchange is beneficial for both sides, it is most often done for free. Peering also reduces operating costs as it gets you free transit, instead...
Bash Scripting Conditionals
Reading time: 4 minutes
After we nailed down the part with variables, let’s move on to bash scripting conditionals. Conditional statements (branching) help our script execute commands based on tests. With conditional statements, we determine which part of the code (branch) will execute. The basic statement used for branching would be the IF statement. Branching in bash differs from...
How to start building your first RPM
Reading time: 3 minutes
What is an RPM? One of the main benefits of open source software is that it lets you access each application’s core. Yet, even with that level of access, there’s a need to run simple tasks (running scripts, starting system services…) in a more simple way. That simplified code is referred to as packages (RPM). The...
Extended Validation Certificate
Reading time: 2 minutes
Regular SSL certificate doesn’t help cross-check the website’s identity. It is easy to obtain online and there is no identity check by a human being. At the same time SSL cert doesn’t request force https, so there might be mixed content on the website with files or pages with http and https protocols. That’s why...
Recover Root Password on CentOS 7
Reading time: 2 minutes
As lots of system administrators have been in a situation where they misplaced their root passwords or confused Girlfriend’s birthday with it… Well, to some of us at least 🙂 Anyhow, just recently I happen to have got into an argument about whether to change the password on a monthly basis or less frequently. The...
BASH Preview
Reading time: 9 minutes
What is bash Bash is a command language interpreter for the gnu based linux operating systems. Name itself stands for ‘Bourne-Again -SHell’, which was given as an honorable mention to Stephen Bourne, the author of the direct ancestor of the current unix shell sh. Bash is largely compatible with sh and incorporates useful features from Korn shell ksh and...
Google Adwords for young businesses
Reading time: 4 minutes
Are you authoritative enough? Let’s face it – Google dominates the digital advertising space real estate, and more and more businesses are turning away from other platforms in favor of Google Adwords (GA). And rightfully so, as Google puts great attention to detail when their marketing platform is concerned – anyone who ever read the Google...
Qualifying Clients – SaaS
Reading time: 5 minutes
What is SaaS? SaaS stands for “Software as a service”, it’s a software licensing and delivery model. Usually accessed by users via a web browser. In the past few years SaaS became a delivery method for many business applications: Office and messaging software Payroll processing software Management software CAD software Development software Companies (SalesForce, NetSuite,...