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Intellij Maven folders

I haven’t been coding a lot recently, and when I spun up a new maven spring boot project and imported in to IntelliJ, I got confused about which folders are supposed to be marked as source (src, src/main or src/main/java?) and test (src/test or src/test/java?).

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Talk summary: Reactive DDD by Vaughn Vernon @ QCon2018

Some notes on the “Reactive DDD – When Concurrent Waxes Fluent” talk by Vaughn Vernon (author of Implementing Domain-Driven Design) at QCon 2018. (Currently I think you need to be logged in as a ticket holder to see the talk – I will post a link if it becomes public)

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Testing in Production Presentation – SVCC 2018

The following post is essentially a written version of the Testing in production talk I gave at Silicon Valley Code Camp 2018. You can find the presentation deck here at slideshare.

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Talk summary: Chaos Engineering by Adrian Cockroft @ ChaosConf18

Title: Chaos Engineering – What is it, where did it come from, and where might it be going?

Speaker: Adrian Cockcroft (AWS VP Cloud Architecture Strategy)

Conference: Chaos Conference 2018 (http://chaosconf.io/)

Video: https://www.youtube.com/watch?v=cefJd2v037U

The following are some brief notes and slide summaries from Adrian’s keynote at ChaosConf 2018…

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Notes from TechKnowCon 2018

I attended TechKnowCon (https://techknowcon.splashthat.com/) this week. I enjoyed the  conference a lot. It centered around the theme of continuous learning, and how to instill a learning culture in your work environment. There were 2 talks in particular that I got a lot from, “Teach Like an Engineer” and “Peer learning at scale”…

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Dev Environment Setup

This post covers some of the basic steps I need to do each time to setup my dev environment on a new mac. I use this post in conjunction with the mac tools post.

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Book summary: Distributed Systems Observability

“Distributed Systems Observability” is a book from Cindy Sridharan (find her on twitter, and medium), available as a free download here (registration required). At a little over 30 pages and 8,000 words, it is not a difficult read, and I definitely recommend it.

 

 

 

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Testing in Production

“Testing in production” used to be a joke. The implication was that by claiming to test in production, you didn’t really test anywhere, and instead just winged it: deploying to production and hoping that it all worked. Times have changed however, and testing in production is becoming accepted as a best practice.

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Book summary: Chaos Engineering

Chaos Engineering“Chaos Engineering” is a book from O’Reilly (free download), written by folks from the “The Chaos team” at Netflix. It is a GREAT read for anyone interested in resilience engineering. This post is essentially a cut and paste of the most salient parts (the original is about 16,000 words; this is about 3,000), with some paraphrasing and merging/rewriting of sections for brevity.

 

 

 

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Talk summary: How Complex Systems Fail by Dr Richard Cook @ Velocity 2012

“How Complex Systems Fail” is a talk by Dr Richard Cook at Velocity 2012.

I’ve included a link to the video on YouTube below, and some of my key takeaway points.

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Talk summary: Using Chaos to Build Resilient Systems by Tammy Butow @ QCon2018

Using Chaos to Build Resilient Systems” was a talk by given by Tammy Butow of Gremlin at QCon New York 2018 . I really enjoyed the talk, so wanted to summarize some of the key points of interest to me.

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Passed AWS Certified Solutions Architect Associate

I just completed my “AWS Certified Solutions Architect – Associate”.

If you’re interested in AWS Certification, this AWS Certification Roadmap gives an overview of the certifications available, and this post from New Relic has details on the order you may want to take the exams in.

The AWS Certified Solutions Architect – Associate exam I started with is a tough exam. I’d estimate I spent over 100 hours preparing, and I used every one of the 130 minutes available in the exam to answer all 65 questions.

I’ve included a few exam prep tips below.

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How long to transfer a file of size X over a Y Mbps line?

How long does it take to transfer a file of size X over a Y Mbps line?

A 1 MB file over a 1 Mbps line takes 8 seconds. Not 1 second, due to MegaBytes over MegaBits

1 GB over 1 Mbps = 8192 secs (8*1024; 2.2755 Hours)

1 TB over 1 Mbps = 8388608 secs (2,330 Hours = 97 days)

So a good rule of thumb to remember is:

1Tb over 1Mbps takes ~100 days (8 * 1,000,000 secs)

There are also good online calculators for this. For example:

Convert Megabits Per Second to Terabytes Per Month

 

 

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AWS approximate storage costs

This post covers some high-level cost approximations for data storage in AWS. I find this a useful rule of thumb, and please see the long list of caveats and notes below, but as a rough approximation of ballpark costs…

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Setting up a VPC in AWS

In the previous blog post, we created a simple HelloWorld example in AWS. We did the bare minimum (as any HelloWorld example should!) by taking advantage of a default VPC, Subnet, NACL, and Internet Gateway but, by necessity for our example, creating a custom Security Group.

In this tutorial, we will shy away from defaults and create a VPC from scratch. Again, this is done in the guise of HelloWorld.

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