noyaml
cdk8s
noyaml | cdk8s | |
---|---|---|
9 | 48 | |
416 | 4,145 | |
- | 1.5% | |
5.3 | 9.7 | |
2 months ago | 3 days ago | |
CSS | JavaScript | |
GNU Affero General Public License v3.0 | Apache License 2.0 |
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noyaml
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Kubernetes Through the Developer's Perspective
Most commonly written in YAML, these files are large and complex to read and understand. And being written in YAML comes with its challenges (and quirks) since it is an additional programming language that devs need to learn.
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JSON Canvas – An open file format for infinite canvas data
YAML is kind of like C++:
> You like C++ because you're only using 20% of it. And that's fine, everyone only uses 20% of C++, the problem is that everyone uses a different 20% :)
https://eli.thegreenplace.net/2009/10/17/the-c-bashing-seaso...
The YAML footguns are too numerous to reproduce here, so here are some sources:
https://stackoverflow.com/questions/3790454/how-do-i-break-a...
https://www.arp242.net/yaml-config.html
https://noyaml.com/
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Why the fuck are we templating YAML? (2019)
Relevant: https://noyaml.com/
YAML and its ecosystem is full of footguns and ergonomics problems, especially when the length of the document extends beyond the height of a user's editor or viewport. Loss of context with indentation, non-compliant or unsafe parsers, and strange boolean handling to name a few.
It becomes even worse when people decide that static YAML data files should have variable substitution or control flow via templating. "Stringly-typed programming" if you will. If we all started writing JSON text templates I think a lot of people would rightly argue we should write small stdlib-only programs in Python, Typescript, or Ruby to emit this JSON instead of using templated text files. Then it becomes apparent that the YAML template isn't a static data file at all, but part of a program which emits YAML as output. We're already exposing people to basic programming if we're using YAML templates. People brew a special kind of YAML-templated devops hell using tools like Kustomize and Helm, each of which are "just YAML" but are full of idiosyncracies and tool-specific behaviour which make the use of YAML almost coincidental rather than a necessity.
Yes, sometimes people would prefer to look at YAML instead of JSON, in which case I suggest you use a YAML serialization library, or pipe output into a tool like `yq` so you can view the pretty output. In a pinch you could even output JSON and then feed it through a YAML formatter.
The Kubernetes community seems to have this penetrating "oh, it's just YAML" philosophy which means we get mediocre DSLs in "just YAML" which actually encode a lot of nuanced and unintuitive behaviour which varies from tool to tool.
Look at kyverno, for examle: it uses _parentheses_ in YAML key names to change the semantics of security policies! https://kyverno.io/docs/writing-policies/validate/ . This is different to what I think is the (much better ideas of) something like kubewarden, gatekeeper, or jspolicy, which allow engineers to write their policies in anything that compiles to WASM, OPA, and Typescript/Javascript respectively.
We engineers, as a discipline, have decades of know-how building and using general purpose programming languages with type checkers, linters, packaging systems, and other tools, but we throw them all away as soon as YAML comes along. It's time to put the stringified YAML templates away and engage in the ecosystem of mature tools we already to use to perform one simple task they are already good at: dumping JSON on stdout.
Let's move the control flow back into the tool and out of the YAML.
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YAML's homepage is displayed in YAML
The webpage documenting some of the sharp edges of yaml is also displayed as an editable yaml document
https://noyaml.com/
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stopDoingJson
It’s the least secure config format, even worse than XML IMO since it’s unsafe even with trusted inputs. https://noyaml.com/
- That's a Lot of YAML
cdk8s
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K8s Service Meshes: The Bill Comes Due
Any, it doesn’t matter which as long as you don’t have to count spaces in yaml by hand.
If you really want a concrete recommendation try https://cdk8s.io/.
- Why the fuck are we templating YAML? (2019)
- Cdk8s: Kubernetes native apps and abstractions using object-oriented programming
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10 Ways for Kubernetes Declarative Configuration Management
CDK8s - CDK8s is used to define Kubernetes resources and applications. CDK8s uses the high-level abstraction concept called constructs to represent various Kubernetes resources such as deployments, services, and configurations. Developers can write code in programming languages like TypeScript, Python, and Java, and CDK8s will translate this code into standard Kubernetes YAML manifests that can be directly applied to a Kubernetes cluster.
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I built a React renderer for Kubernetes configurations
Have you looked into https://cdk8s.io/? I've been using it for a while now, and I must admit TypeSript does help a lot. Not really sold on your React syntax yet, but well done nevertheless
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How are most EKS clusters deployed?
I, personally, prefer to wrap it in CDKTF/CDK8S in golang and manage with Crossplane Composition Functions, but your mileage may vary. I'm finding way too bugs in CDK's... but it calms me a bit, that Amazon folks actually looking into it.
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Editing Badly formatted yaml file
Have you looked into cdk8s? That will let you get away from dealing with yaml and let you use code instead. Helm included.
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kpt, cue, ... Your experiences?
My favorite is cdk8s + typescript.
- Cloud Development Kit for Kubernetes
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Dump Kustomize with 20 lines of TypeScript
What about https://cdk8s.io/?
What are some alternatives?
yj - CLI - Convert between YAML, TOML, JSON, and HCL. Preserves map order.
helmfile - Deploy Kubernetes Helm Charts
hjson - Hjson, a user interface for JSON
Pulumi - Pulumi - Infrastructure as Code in any programming language. Build infrastructure intuitively on any cloud using familiar languages 🚀
doximus - static, smart and developer friendly API documentation generator
terraform-cdk - Define infrastructure resources using programming constructs and provision them using HashiCorp Terraform
json2jsii - Generates jsii-compatible structs from JSON schemas
aws-cdk - The AWS Cloud Development Kit is a framework for defining cloud infrastructure in code
PyYAML
jsonnet - Jsonnet - The data templating language
crd-to-sample-yaml - Generate a sample YAML file from a CRD
kubernetes-the-hard-way - Bootstrap Kubernetes the hard way. No scripts.