There are times when you may have a need to test server performance when investigating an issue or doing a predictive analysis. I learned an easy way to do this on Linux using the built-in ‘yes’ command. From the man page for the ‘yes’ command: NAME yes - output a string repeatedly until killed This does exactly as it says and will consume the CPU unless it is controlled or killed.

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Wasabi Storage Storage is one of the costliest options in the cloud and probably the biggest deterrent to migration. Fortunately, a handful of contenders are changing the game and breaking into affordable options for personal budgets. One of these companies is Wasabi. I have embraced the AWS platform, so on the surface this appears to be in opposition to that. Maybe it is, but Wasabi utilizes AWS S3 on the backend with a pricing strategy fit for personal as well as business use.

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As I’ve stated in previous posts, I currently use CloudFlare as my CDN. There are several reasons for this that I won’t go into now. One of the “ToDo’s” on my list has been to clear CloudFlare’s cache when I upload new content to my blog. I was finally able to spend some time and get that done. CloudFlare API To start things off I reviewed the doc for the CloudFlare API.

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It’s important to know your limits. In this case study we find a situation stemming from SMTP being throttled. This is part of the packet capture I received: The top lines show the previous conversation ending. SMTP successfully sent 3 messages. After the 3rd message the mail server stopped responding and retransmits began. This pattern was repeatable. More than that it was repeatable from other EC2 instances. The only thing between the EC2 instances and the mail server was a router and a firewall.

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Alexa App for Kids

If you refer to this post, you’ll see that one of my objectives for this year was to develop an Alexa app for my kids. Well, I am happy to report this objective as completed. The cover art and the image below show the high level architecture. The app idea actually started based on something I was doing for my kids that they really took a liking to. Unfortunately, for this post it might be an idea that I could actually publish and potentially monetize.

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Being that I recently took the plunge to a static site hosted on AWS S3 I thought I would create a post outlining the high-level process for future reference. There are quite a few blogs in the interwebs outining this process, but if this helps someone else too then it’s a win-win. If you are curious as to WHY I migrated, you can find a short bit about that in this post.

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Chris Sereno

For 11 years networking was my profession with a specialized focus on proactive and reactive performance analysis. More recently I have embraced the AWS platform. This blog reflects my experience both past and present.

AWS Architect at Caterpillar, Inc.

US