yamyams

README

YamYams

Replace Kubernetes YAML with raw Go!

Say so long 👋 to YAML and start using the Go 🎉 programming language to represent and deploy applications.

Take advantage of all the lovely features of Go.

Test your code directly in local Kubernetes using kind.

Get your application directly into Go instead of YAML and use it in controllers, operators, CRs/CRDs easily. Use the Go compiler to your advantage.

About

This is a framework for infrastructure teams who need more than just conditional manifests.

This allows teams to start encapsulating, managing, and testing their applications in raw Go.

Teams can now buid controllers, operators, and custom toolchains using reliable, testable, and scalable Go.

The philosophy

The bet here is that any person confident in managing YAML for Kubernetes can also be equally as confident managing Go for Kubernetes.

The feature add is that no matter how good our YAML management tools get, they will never be as good as just plain Go when it comes to things like syntax checking, testing, shipping, and flexibility.

Nothing fancy

Feel free to fork this repository and begin using it for your team. There isn't anything special here. 🤷‍♀ We use the same client the rest of Kubernetes does.

❎ No new tools.

❎ No charts.

❎ No templating at runtime.

❎ No vague error messages.

❎ No more YAML guessing/checking.

✅ Just Go. 🎉

Features

✨ There is not a single .yaml file in this entire repository. ✨

• Express applications in 🎉 Go instead of YAML.
• Use the Go compiler to check your syntax.
• Write real tests 🤓 using Go to check and validate your deployments.
• Test your applications in Kubernetes using kind.
• Define custom installation logic. What happens if it fails?
• Define custom application registries. Multiple apps of the same flavor? No problem.
• Use the latest client (the same client the rest of Kubernetes uses).

Creating a new app

Copy sampleapp to a new folder in /apps to get started.

cp -rv apps/sampleapp apps/hello

Edit your new application /apps/hello/app.go.

Use the same client the rest of Kubernetes uses to express your application.

Register your application in /registry.go.

func Load(){
    yamyams.Register(hello.New("default", "hello-app"))
}

Testing your application

Create a new test for hello and edit the tests.

cp apps/sampleapp_test.go apps/hello_test.go

Then bootstrap a local kind cluster and actually deploy your application to a real Kubernetes cluster.

sudo -E make test

You can add custom integration tests to check whatever you want.

func TestHelloAppName(t *testing.T) {
	app := hello.New("default", "hello-app")
	if app.Name != "hello-app" {
		t.Errorf("app Name is not plumbed through from New()")
	}
}

Deploy your application

You can now deploy your application directly to Kubernetes from the provided CLI tool.

make
sudo -E make install
yamyams install hello-app

You can also list and uninstall

yamyams list
yamyams uninstall

Use your application in many ways.

Now that your application is expressed in Go you can easily use tools like Kubernetes controllers and CRDs to manage and reconcile your application.

• KubeBuilder can help you build CRDs and operators.
• Operator Framework can help you build CRDs and operators.
• cdk8s can be used to generate YAML in a similar way this project represents applications.

Documentation

Index

• Variables
• func Load()

Variables

var Version string

Version is set at compile time and used for this specific version of YamYams

Functions

func Load

func Load()

Load is where we can set up applications.

This is called whenever the yamyams program starts.