Generate typed CustomResources based on Kubernetes CustomResourceDefinitions.
crd2pulumi is a CLI tool that generates typed CustomResources based on Kubernetes CustomResourceDefinition (CRDs).
CRDs allow you to extend the Kubernetes API by defining your own schemas for custom objects. While Pulumi lets you create
CustomResources, there was previously
no strong-typing for these objects since every schema was, well, custom. This can be a massive headache for popular CRDs
such as cert-manager or
istio, which
contain thousands of lines of complex YAML schemas. By generating typed versions of CustomResources, crd2pulumi makes
filling out their arguments more convenient by allowing you to leverage existing IDE type checking and autocomplete features.
If you wish to use crd2pulumi without developing the tool itself, you can use one of the binary releases hosted on this repository.
crd2pulumi can be installed on Mac from the Pulumi Homebrew tap.
brew install pulumi/tap/crd2pulumicrd2pulumi uses Go modules to manage dependencies. If you want to develop crd2pulumi itself, you'll need to have
Go installed in order to build. Once you install this prerequisite, run the following to build the crd2pulumi binary
and install it into $GOPATH/bin:
$ go build -ldflags="-X github.com/pulumi/crd2pulumi/gen.Version=dev" -o $GOPATH/bin/crd2pulumi main.goThe ldflags argument is necessary to dynamically set the crd2pulumi version at build time. However, the version
itself can be anything, so you don't have to set it to dev.
Go should then automatically handle pulling the dependencies for you. If $GOPATH/bin is not on your path, you may
want to move the crd2pulumi binary from $GOPATH/bin into a directory that is on your path.
crd2pulumi is a CLI tool that generates typed Kubernetes
CustomResources to use in Pulumi programs, based on a
CustomResourceDefinition YAML schema.
Usage:
crd2pulumi [-dgnp] [--nodejsPath path] [--pythonPath path] [--dotnetPath path] [--goPath path] <crd1.yaml> [crd2.yaml ...] [flags]
crd2pulumi [command]
Examples:
crd2pulumi --nodejs crontabs.yaml
crd2pulumi -dgnp crd-certificates.yaml crd-issuers.yaml crd-challenges.yaml
crd2pulumi --pythonPath=crds/python/istio --nodejsPath=crds/nodejs/istio crd-all.gen.yaml crd-mixer.yaml crd-operator.yaml
crd2pulumi --pythonPath=crds/python/gke https://raw.githubusercontent.com/GoogleCloudPlatform/gke-managed-certs/master/deploy/managedcertificates-crd.yaml
Notice that by just setting a language-specific output path (--pythonPath, --nodejsPath, etc) the code will
still get generated, so setting -p, -n, etc becomes unnecessary.
Available Commands:
help Help about any command
version Print the version number of crd2pulumi
Flags:
-d, --dotnet generate .NET
--dotnetName string name of .NET package (default "crds")
--dotnetPath string optional .NET output dir
-f, --force overwrite existing files
-g, --go generate Go
--goName string name of Go package (default "crds")
--goPath string optional Go output dir
-h, --help help for crd2pulumi
-n, --nodejs generate NodeJS
--nodejsName string name of NodeJS package (default "crds")
--nodejsPath string optional NodeJS output dir
-p, --python generate Python
--pythonName string name of Python package (default "crds")
--pythonPath string optional Python output dir
Use "crd2pulumi [command] --help" for more information about a command.Setting only a language-specific flag will output the generated code in the default directory; so -d will output to
crds/dotnet, -g will output to crds/go, -n will output to crds/nodejs, and -p will output to crds/python.
You can also specify a language-specific path (--pythonPath, --nodejsPath, etc) to control where the code will be
outputted, in which case setting -p, -n, etc becomes unnecessary.
Let's use the example CronTab CRD specified in resourcedefinition.yaml from the
Kubernetes Documentation.
To generate a strongly-typed CronTab CustomResource in TypeScript, we can run this command:
$ crd2pulumi --nodejsPath ./crontabs resourcedefinition.yamlNow let's import the generated code into a Pulumi program that provisions the CRD and creates an instance of it.
import * as crontabs from "./crontabs"
import * as pulumi from "@pulumi/pulumi"
// Register the CronTab CRD.
const cronTabDefinition = new crontabs.stable.CronTabDefinition("my-crontab-definition")
// Instantiate a CronTab resource.
const myCronTab = new crontabs.stable.v1.CronTab("my-new-cron-object",
{
metadata: {
name: "my-new-cron-object",
},
spec: {
cronSpec: "* * * * */5",
image: "my-awesome-cron-image",
}
})As you can see, the CronTab object is typed! For example, if you try to set
cronSpec to a non-string or add an extra field, your IDE should immediately warn you.
$ crd2pulumi --pythonPath ./crontabs resourcedefinition.yamlimport pulumi_kubernetes as k8s
import crontabs.pulumi_crds as crontabs
# Register the CronTab CRD.
crontab_definition = k8s.yaml.ConfigFile("my-crontab-definition", file="resourcedefinition.yaml")
# Instantiate a CronTab resource.
crontab_instance = crontabs.stable.v1.CronTab(
"my-new-cron-object",
metadata=k8s.meta.v1.ObjectMetaArgs(
name="my-new-cron-object"
),
spec=crontabs.stable.v1.CronTabSpecArgs(
cron_spec="* * * */5",
image="my-awesome-cron-image",
)
)$ crd2pulumi --goPath ./crontabs resourcedefinition.yamlNow we can access the NewCronTab() constructor. Create a main.go file with the following code. In this example,
the Pulumi project's module is named crds-go-final, so the import path is crds-go-final/crontabs/stable/v1. Make
sure to swap this out with your own module's name.
package main
import (
crontabs_v1 "crds-go-final/crontabs/stable/v1"
meta_v1 "github.com/pulumi/pulumi-kubernetes/sdk/v2/go/kubernetes/meta/v1"
"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)
func main() {
pulumi.Run(func(ctx *pulumi.Context) error {
// Register the CronTab CRD.
_, err := yaml.NewConfigFile(ctx, "my-crontab-definition",
&yaml.ConfigFileArgs{
File: "resourcedefinition.yaml",
},
)
if err != nil {
return err
}
// Instantiate a CronTab resource.
_, err := crontabs_v1.NewCronTab(ctx, "cronTabInstance", &crontabs_v1.CronTabArgs{
Metadata: &meta_v1.ObjectMetaArgs{
Name: pulumi.String("my-new-cron-object"),
},
Spec: crontabs_v1.CronTabSpecArgs{
CronSpec: pulumi.String("* * * * */5"),
Image: pulumi.String("my-awesome-cron-image"),
Replicas: pulumi.IntPtr(3),
},
})
if err != nil {
return err
}
return nil
})
}$ crd2pulumi --dotnetPath ./crontabs resourcedefinition.yamlusing Pulumi;
using Pulumi.Kubernetes.Yaml;
using Pulumi.Kubernetes.Types.Inputs.Meta.V1;
class MyStack : Stack
{
public MyStack()
{
// Register a CronTab CRD.
var cronTabDefinition = new Pulumi.Kubernetes.Yaml.ConfigFile("my-crontab-definition",
new ConfigFileArgs{
File = "resourcedefinition.yaml"
}
);
// Instantiate a CronTab resource.
var cronTabInstance = new Pulumi.Crds.Stable.V1.CronTab("cronTabInstance",
new Pulumi.Kubernetes.Types.Inputs.Stable.V1.CronTabArgs{
Metadata = new ObjectMetaArgs{
Name = "my-new-cron-object"
},
Spec = new Pulumi.Kubernetes.Types.Inputs.Stable.V1.CronTabSpecArgs{
CronSpec = "* * * * */5",
Image = "my-awesome-cron-image"
}
});
}
}If you get an
Duplicate 'global::System.Runtime.Versioning.TargetFrameworkAttribute' attributeerror when trying to runpulumi up, then try deleting thecrontabs/binandcrontabs/objfolders.
Now let's run the program and perform the update.
$ pulumi up
Previewing update (dev):
Type Name Plan
pulumi:pulumi:Stack examples-dev
+ ├─ kubernetes:stable.example.com:CronTab my-new-cron-object create
+ └─ kubernetes:apiextensions.k8s.io:CustomResourceDefinition my-crontab-definition create
Resources:
+ 2 to create
1 unchanged
Do you want to perform this update? yes
Updating (dev):
Type Name Status
pulumi:pulumi:Stack examples-dev
+ ├─ kubernetes:stable.example.com:CronTab my-new-cron-object created
+ └─ kubernetes:apiextensions.k8s.io:CustomResourceDefinition my-crontab-definition created
Outputs:
urn: "urn:pulumi:dev::examples::kubernetes:stable.example.com/v1:CronTab::my-new-cron-object"
Resources:
+ 2 created
1 unchanged
Duration: 17s
Permalink: https://app.pulumi.com/albert-zhong/examples/dev/updates/4It looks like both the CronTab definition and instance were both created! Finally, let's verify that they were created by manually viewing the raw YAML data:
$ kubectl get ct -o yaml- apiVersion: stable.example.com/v1
kind: CronTab
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"stable.example.com/v1","kind":"CronTab","metadata":{"labels":{"app.kubernetes.io/managed-by":"pulumi"},"name":"my-new-cron-object"},"spec":{"cronSpec":"* * * * */5","image":"my-awesome-cron-image"}}
creationTimestamp: "2020-08-10T09:50:38Z"
generation: 1
labels:
app.kubernetes.io/managed-by: pulumi
name: my-new-cron-object
namespace: default
resourceVersion: "1658962"
selfLink: /apis/stable.example.com/v1/namespaces/default/crontabs/my-new-cron-object
uid: 5e2c56a2-7332-49cf-b0fc-211a0892c3d5
spec:
cronSpec: '* * * * */5'
image: my-awesome-cron-image
kind: List
metadata:
resourceVersion: ""
selfLink: ""
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