Infrastructure Engineering: Systems, Networking, Databases & the Internet
10 views
Network architecture, internet protocols, database and systems design, and the infrastructure engineering decisions that determine whether real production systems hold up under load.
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 →macOS: Find Processes Using a Specific Remote Port
I find this script useful for debugging which processes are talking to which remote port. Example Usuage:
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 →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 →Add or Subtract Weekdays from a Date: Simple Function
Below is a simple function to add or subtract a number of weekdays to a specified date.
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 →Public Cloud Migration: Why Lift-and-Shift Strategies Fail
The cloud is hot…. not just a little hot, but smokin hot!! Covid is messing with the economy, customers are battling financially, the macro economic outlook is problematic, vendor costs are high and climbing and security needs more investment every year. What on earth do we do??!! I know…. lets start a crusade – lets […]
Read more →How to Debounce Search in JavaScript, React, and Angular
Why debouncing is one of the highest value patterns in responsive web development Most developers have built a search box that fires an API call on every keystroke and at some point felt the full weight of that decision. The network tab fills with hundreds of requests, the backend slows under the load, the UI […]
Read more →Auto-Recover a Failed WordPress Instance on AWS
When WordPress goes down on your AWS instance, waiting for manual intervention means downtime and lost revenue. Here are two robust approaches to automatically detect and recover from WordPress failures. Approach 1: Lambda Based Intelligent Recovery This approach tries the least disruptive fix first (restarting services) before escalating to a full instance reboot. Step 1: […]
Read more →