dhall-aws-cloudformation
tanka
dhall-aws-cloudformation | tanka | |
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2 | 25 | |
28 | 2,236 | |
- | 3.3% | |
6.6 | 8.3 | |
about 2 months ago | 9 days ago | |
Haskell | Go | |
BSD 3-clause "New" or "Revised" License | Apache License 2.0 |
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dhall-aws-cloudformation
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The Dhall Configuration Language
I have been writing a fair amount of Dhall using autogenerated CloudFormation bindings ( https://github.com/jcouyang/dhall-aws-cloudformation/ ). It is a fantastic way to reduce boilerplate and factor out recurring blobs. My main frustration is that the type checker is not smart enough (or maybe the type system is undecidable?) - every time you want to use a polymorphic function, you must pass in the type parameters yourself (this is also true for empty lists and `None`). This makes simple FP idioms extremely noisy, to the point where you're better off writing longhand. In a language that's meant to be alleviating YAML/JSON boilerplate.
It's still a massive improvement, but it could be so much better if the typechecker was smarter.
- Typecheck and Modularize AWS CloudFormation with Dhall
tanka
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Why the fuck are we templating YAML? (2019)
I would recommend implementing a similar API to Grafana Tanka: https://tanka.dev
When you "synthesise", the returned value should be an array or an object.
1. If it's an object, check if it has an `apiVersion` and `kind` key. If it does, yield that as a kubernetes object and do not recurse.
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What Is Wrong with TOML?
Maybe you'd like jsonnet: https://jsonnet.org/
I find it particularly useful for configurations that often have repeated boilerplate, like ansible playbooks or deploying a bunch of "similar-but" services to kubernetes (with https://tanka.dev).
Dhall is also quite interesting, with some tradeoffs: https://dhall-lang.org/
A few years ago I did a small comparison by re-implementing one of my simpler ansible playbooks: https://github.com/retzkek/ansible-dhall-jsonnet
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Show HN: Keep β GitHub Actions for your monitoring tools
- validation is often impractical (at least identifying exactly where the error isβ¦ Iβm looking at you Helm!)
Unrelated to OP, but you can leverage Tanka to extend helm charts with functionality not provided by upstream.
https://tanka.dev/
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Alternatives to Helm?
Although jsonette might be considered more complex Tanka is a great alternative for k8s config management.
- Helm makes it overly complex, or is it just me?
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The YAML Document from Hell
At Grafana Labs we're using jsonnet at scale, while being a powerful functional language it is also excellent for rendering JSON/YAML config. We have developed Tanka[0] to work with Kubernetes, for other purposes I can recommend this course[1] (authored by me).
[0] https://tanka.dev/
[1] https://jsonnet-libs.github.io/jsonnet-training-course/
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Should i migrate from Kustomize to Helm?
If you're hitting the limits of Kustomize, maybe look at Tanka as well.
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Is it possible to wrap Kustomize yaml with jinja2?
Yes, try Tanka.
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Using Docker β Compose in Development and Production
yes. basically. and this is a path that multiple people are trying to solve. e.g. AWS CDK8s, https://tanka.dev/, etc
Compose would be awesome.
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Google Kubernetes clusters config checker tool
http://tanka.dev
(Note I work for Grafana Labs who fund Tanka and use it for all production config)
What are some alternatives?
dhall-nix
helm-charts - Prometheus community Helm charts
cachix - Command line client for Nix binary cache hosting:
kustomize - Customization of kubernetes YAML configurations
jrsonnet - Rust implementation of Jsonnet language
kapitan - Generic templated configuration management for Kubernetes, Terraform and other things
go-jsonnet
ytt - YAML templating tool that works on YAML structure instead of text
shake-dhall - Facilities for using Shake + dhall
kpt - Automate Kubernetes Configuration Editing
dhall-manual - The Dhall Configuration Language Manual
Pulumi - Pulumi - Infrastructure as Code in any programming language. Build infrastructure intuitively on any cloud using familiar languages π