Infrastructure Engineering: Systems, Networking, Databases & the Internet
178 views
Network architecture, internet protocols, database and systems design, and the infrastructure engineering decisions that determine whether real production systems hold up under load.
How to Poll a URL with Watch and Curl in Linux
If you want to quickly test a URL for changes, then the linux Watch command couple with Curl is a really simple way to hit a URL every n seconds (I use this for blue/green deployment testing to make sure there is no downtime when cutting over):
Read more →MTR on macOS: Fix Traceroute Issues with Zscaler VPN
If your on a zero trust network adapter like zscaler or netskope, you will see that traceroute doesn’t work as expected. The article below shows how to install mtr (my trace route) using brew: Next we need to change the owner of the MTR package and it’s permissions (otherwise you will need to run it […]
Read more →
What Is My IP Address? IPv4 Explained for Beginners
Firstly, let me acknowledge that there are lots of these kinds of posts on the internet. But the reason why i wrote this blog is that I wanted to force myself to consolidate the various articles I have read and my learnt knowledge in this space. I will probably update this article several times and […]
Read more →NMAP Vulnerability Scan Script With Formatted Report on macOS
If you want to quickly health check your website, then the following script is a simple NMAP script that scans your site for common issues and formats the results in a nice report style. Here’s a comprehensive guide on how to fix each type of directory permission issue that the above script might find (for […]
Read more →
Why Visible Technology Leaders Build More Trust Than Silent Ones
1. The Corporate Voice Is Losing Credibility A strange thing is happening in executive communication. The more polished it becomes, the less believable it feels. For years, large organizations trained executives to communicate through multiple layers of lawyers, communications teams, governance forums, media handlers, and reputation specialists. Every statement became progressively safer, flatter, and more […]
Read more →gping Over Zero Trust Networks on macOS: Interface Guide
Once you start using a zero trust network, the first causality is normally the Ping command. The gping (Graphical Ping) command line displays a color coded realtime graph of continuous pings to a specified host and it supports specifying alternate interfaces/gateways. First lets find which interface to use. The “arp -a” command is used to display […]
Read more →Technology Leadership Competence: Self-Assessment Guide
A Self Assessment for Technology Leaders This questionnaire explores how you think about technology leadership, systems, teams, and delivery. There are no right or wrong answers. Each question presents four options that reflect different leadership styles and priorities. Simply select the option that best reflects your natural instinct in each situation. Select one answer per […]
Read more →
Software Engineering : When Building Beats Buying (And When It Doesn’t)
1. A disclosed bias I spent twelve years writing algorithmic trading software before any of the cloud infrastructure work. That is where the bias actually comes from, not from EC2. Trading systems taught me that being quick and being good are not separate goals you trade off against each other, they are the same requirement […]
Read more →Fix Render-Blocking JavaScript in WordPress: 3-Step Guide
If you’ve run your site through Google PageSpeed Insights and seen the “Eliminate render-blocking resources” warning, you’ve probably wondered why something that sounds so simple is so hard to actually fix. The answer is that WordPress makes it surprisingly easy to load JavaScript the wrong way — and surprisingly difficult to fix it without either […]
Read more →How to Flush DNS Cache on MacBook: Terminal Command
I am not going to tell you why you would need to flush your DNS cache (you will know if you need to). So, to flush DNS on a mac simply fire up Terminal and run the following sudo command:
Read more →How to Delete the Icon Cache in Windows (Fix Glitches)
I remember getting weird flashing on my laptop and eventually figured out my icon cache was full. So if you ever get this, try running the script below. This is obviously quite a weird/random post – hope its helpful 🙂
Read more →