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Beginning with the 0.10.x version tree of Terraform, HashiCorp decided to decouple providers from the main Terraform runtime (see the 0.10.0 CHANGELOG for details). For a lot of users, this is a seamless win as Terraform will pull down whatever providers it deduces that it needs to execute your build assuming you have network connectivity to reach their servers and grab the files. This flexible architecture allows new providers to be released, bugfixes and features to be introduced in existing providers without requiring a version increment and download of a monolithic Terraform package.

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First off, forgive the title. I fall much more on the side of “devops” as a cultural mindset than a thing we do, but when it comes to searching for and exposing things for search on the interwebs, I’m going with the status quo. Next, a few caveats: I haven’t used every single one of these to great extent (or some even at all), but they are tools that are on my radar.

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OK, so not truly a one-liner, but a nice quick-n-dirty way to get a count of all active AZs for each region for your AWS account. echo -e "$(tput bold)Region | # AZs$(tput sgr0)" for region in $(aws ec2 describe-regions | jq -r '.Regions[].RegionName'); do num_azs=$(aws ec2 describe-availability-zones --region ${region} | jq -r '.AvailabilityZones | length') printf '%-15s | %5s\n' ${region} ${num_azs} done This requires jq and the AWS CLI to be installed.

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Lately I’ve had the good fortune of working on an app migration effort with a heavy focus on containerization, specifically a couple of batch processes which run daily. Formerly, these processes were run by an enterprise scheduling system which handled alerting. After deciding to rewrite the batch processing functions and containerize them, that left me short alerting. I decided to implement a new alerting solution using Datadog, since we’re already using it to gather metrics for the main application.

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Remote state is (IMO) one of Terraform’s most powerful and unsung features. It’s also a feature that I notice a lot of first-time users (and unfortunately sometimes people who’ve even been using it for some time) tend to gloss over and ignore. For the first-time user, the light bulb usually goes off for the need of a solution that remote state provides when a scenario like this comes to pass:

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