Generating SSL certificates when Letsencrypt (what is Letsencrypt, who is behind it, and how the heck can you get started) is available for your system works in a breeze, but what if you need your certificates for a machine that won’t take Letsencrypt (for whatever reason)? It is still possible: you can either grab Letsencrypt from Git, or, for reasons of practicality… create a certificate signing request (CSR) on your target server, transfer it to your letsencrypt instance, generate the certificates you need, then transfer the generated files back to your target instance and install the certificates in your software.
How to Set up ip2nation: Geotargeting Made Easy for the Amazon Link Affiliate Plug-in and Your Server-Side Scripts
The Amazon Link plug-in for WordPress implements geotargeting based on ip2nation, a free geotargeting library from Per Gustafsson Consulting (available here). If you are wondering what you need to do in order to integrate the Amazon Link affiliate plug-in for WordPress (seing how a separate installation plugin for WordPress is two years old as of this writing, and counting), here is a quick howto for those who can access their websites’ MySQL or MariaDB database servers.
RegEx Bliss: Set Up URL Redirects in NGINX Using Regular Expressions without Rewrites
There are two major no-nos when it comes to writing NGINX redirects:
- thou shalt not use
if statements(that’s a major no-no); - thought shalt not use
rewrites(they are a waste of resources, as in “slow” and “expensive”).
Instead, use ol’ good location blocks. But what if you have plenty of URIs to redirect? How do you deploy RegEx magic with NGINX? Easy.
Quick Tip: Flush the DNS Resolver Cache on Your Computer when Changing DNS Configuration
When migrating a web service or adjusting DNS settings you may come across unexpected behavior of your site long after all errors have been fixed (or so you thought before hitting the Reload button). The hard reality is that in their quest for speed, web browsers try not to make new DNS requests they deem unnecessary. The result is much screaming&steaming from administrators who are in the middle of a job.
How to Check CPU Credits Usage and Remaining Balance of a Burstable Performance Instance on AWS EC2
For workloads that don’t require a consistent CPU performance but do experience spikes in service demand, Amazon’s AWS EC2 service offers Burstable Performance Instances. Their competitive pricing can contribute to considerable savings and improve service availability, but how do you know if you are getting a good deal? You don’t, unless you are able to verify your CPU credits usage and the remaining balance. Here is how to figure out what’s really going on.
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