I would love it if controller-gen allowed you to use map[string]interface{} types in CRD fields, specifically those marked with: // +kubebuilder:pruning:PreserveUnknownFields.. Defaults to latest when omitted. type SimpleDeploymentSpec struct { Replicas * int `json:"replicas,omitempty"` } The rest of the API configuration is covered in the CronJob tutorial. We describe how to install and set up a template operator project, which can be built and is deployable into a local Kubernetes cluster. // +optional GenerateName bool `json:"generateName,omitempty"` // NameTemplate is the template used to generate the release name if GenerateName is configured. Important: The // +kubebuilder:resource annotation must appear directly above the go struct defining the resource. Kubebuilder will create the webhook file under api directory. Next, we'll re-scaffold out the API types and controllers. ContainerSet contains the image and replicas fields, and ensures a Deployment with matching image and replicas it running in the cluster. // +kubebuilder:validation:Enum=ChartVersion;Revision // +kubebuilder:default:=ChartVersion // +optional ReconcileStrategy string `json:"reconcileStrategy,omitempty"` // ValuesFiles is an alternative list of values files to use as the chart // values (values.yaml is not included by default), expected to . Kubebuilder provides a make target to run controller-gen and generate CRDs: make manifests. For further information see the completion document. For simplicity let us invalidate the controller on negative numbers Generate a Deployment for running the controller manager in Kubernetes. Creating a project. When you run make manifests, you should see CRDs generated under the config/crd/bases directory. We'll use the +kubebuilder:storageversion to do this. ConcurrencyPolicy ConcurrencyPolicy `json:"concurrencyPolicy,omitempty"` // This flag tells the controller to suspend subsequent executions, it does // not apply to already started executions. ). Kubebuilder provides CLI for creating and managing operator projects. The conversion webhook informs the that the API v1alpha version needs to be converted. Viewing legacy documentation for Kubebuilder, check out the latest documentation instead. If I generate the api, there is a KindList struct default generated, and if I understand correctly, it should keep track of the CRs already defined for my CRD. Functionality is identical; this is just a name change to align more with controller runtime terminology. Pretty Printing CRDs with Kubebuilder If you've developed a CRD with Kubebuilder, you know how nice the code generation features are. kubebuilder create webhook group identity.company.org version v3 kind UserIdentityV3 defaulting programmatic-validation . SuccessfulJobsHistoryLimit * int32 `json:"successfulJobsHistoryLimit,omitempty"` // +kubebuilder:validation:Minimum=0 // The number of failed finished jobs to retain. Create a Project Create a directory, and then run the init command inside of it to initialize a new project. CustomResources, CustomResourceDefinition | kubebuilder -sdk kubernetes, API . Create the scaffolding for a new resource using the kubebuilder cli: $ kubebuilder create api --group workloads --version v1beta1 --kind ContainerSet kubebuilder create api --group webapp --version v1 --kind Guestbook Press Options. Remaining API Code Manage the Owned Resource Validation After compilation starts, go to apply and find that the state has changed to running: . It lets you define your CRD using standard Go object, and then add additional information like documentation. CustomResourceDefinitionCustom|kubebuilder&operator-sdk. See the example from kubebuilder documentation: I am using following structure in Go. Since we want both, we'll say yes to both the API and controller prompts when asked what parts we want to scaffold: kubebuilder create api --group batch --version v1 --kind CronJob Changing things up - The Kubebuilder Book Black lives matter. How to assign default value for Enum type. TerminationGracePeriodSeconds int64 `json:"terminationGracePeriodSeconds,omitempty"` . Copy. Configure the API Group suffix ( webapp --> webapp.metamagical.dev 1) $ alias k=kubectl # I'm lazy ;-) $ cd ~/kubecon-project $ go mod init mykubecon $ kubebuilder init --domain <your-domain-here>. Read more about KubeBuilder markers. Namely, all serialized fields must be camelCase, so we use JSON struct tags to specify this. Including: The structure of Kubernetes APIs and Resources API versioning semantics Self-healing Garbage Collection and Finalizers Declarative vs Imperative APIs Level-Based vs Edge-Base APIs It is also added to the scheme by default. The generator crd-schema-gen is a fork of crd-gen in this direction. // Defaults to ChartVersion when omitted. PodSecurityContext `json:"securityContext,omitempty"` // +kubebuilder:validation:Minimum=0 // TerminationGracePeriodSeconds is the amount of time that kubernetes will // give for a pod instance to shutdown normally. Install kubebuilder by downloading the latest stable release from the github repo. kubebuilder create api --group config --version v2 --kind ProjectConfig --resource --controller=false --make=false Use --controller=false You may notice this command from the CronJob tutorial although here we explicity setting --controller=false because ProjectConfig is not intended to be an API extension and cannot be reconciled. "spec,omitempty"` Status VirtulMachineStatus `json:"status,omitempty"` } That's all right. Core uses omitempty and option in tandem for virtually everything, it seems the assumption omitempty=optional is pretty consistent and we just need to accept what it means for status missing at times. CR . "template,omitempty"` // Name is a test field for . Assigning // +kubebuilder:validation:default:=512 does not take effect in generated yaml file. . Again let us use the kubebuilder for webhook scaffloding. To start a new project, one would only need to hit (Assuming Linux-based Terminal): kubebuilder init --domain clientmgr.io --repo clientmgr.io/tutorial kubebuilder create api --group qdnqn --version v1 --kind Client Just hit this in the terminal and you are good to go. Address;Name Type string `json:"alias,omitempty"` } // GuestbookStatus defines the observed state of Guestbook type GuestbookStatus struct { // INSERT ADDITIONAL STATUS FIELD - define observed state of cluster // Important: Run "make" to regenerate code after . The Spec here allows the user to customize the deployment created in various ways. . This book will teach readers how to develop their own Kubernetes APIs and the principles from which the core Kubernetes APIs are designed. const Created SpaceShipPhase = "Created" const Active SpaceShipPhase = "Active" const Passive SpaceShipPhase = "Passive" // SpaceShipsStatus defines the observed state of SpaceShips type SpaceShipsStatus struct { Phase SpaceShipPhase `json:"phase,omitempty"` } // +kubebuilder:subresource:status type SpaceShips struct { . The tool resides in the controller-tools repository which is vendored in every project. We can also use the omitempty struct tag to mark that a field should be omitted from serialization when empty. kubebuilder api/v1/object_types.go controllers/object_controller.go, crdcrdreconsilecrd, main.go Object controllermanager function main(){ . It is desirable to have unstructured input, so that the controller can use server-side . With the transition to Kubebuilder-style projects, pkg/k8sutil is no longer used . The use case is when you have a CRD that has a "template" field, similar to Deployment or Job's .spec.template field. The above marker comment in CEL format is parsed by controller-gen to generate CRDs. // +optional: Now let us add the validation webhook logic. CustomResourceDefinitionCustom. "metadata,omitempty"` Spec v1.PodSpec `json:"spec,omitempty"` } // ExampleSpec defines the desired state of Example type ExampleSpec struct { // INSERT ADDITIONAL SPEC FIELDS - desired state of cluster // Important: Run "make . to regenerate code after modifying this file // roleRef is the target ClusterRole reference roleRef string `json:"roleRef,omitempty"`} . make manifests can generate a number of other artifacts as well -- see the marker reference docs for more details. The conversion webhook does get that event before the event reaches the Kubernetes API server. The XValidation field in CEL rule translates to x-Kubernetes-validation in the CRD. The CEL immutable validation check looks as below. kubebuilder init --domain sealyun.com --license apache2 --owner "fanux" kubebuilder create api --group infra --version v1 --kind VirtulMachine. Here is the implemented status field for my SpaceShip resource. Installing a stable release. // +kubebuilder:validation:Enum=ChartVersion;Revision // +kubebuilder:default:=ChartVersion // +optional ReconcileStrategy string `json:"reconcileStrategy,omitempty"` // Alternative list of values files to use as the chart values (values.yaml // is not included by default), expected to be a relative . printcolumn will specify what fields to show when we do kubectl get darkrooms, yes now we can use kubectl to interact with this new Kind.. Now update the sample manifest to define a Darkroom object, just as you would define a Pod or Service // +kubebuilder:validation:XValidation:rule="self == oldSelf", message="Value is immutable". 2. type SimpleDeploymentSpec struct { Replicas * int `json:"replicas,omitempty"` } The rest of the API configuration is covered in the CronJob tutorial. The Kubebuilder Book Viewing legacy documentation for Kubebuilder, check out the latest documentation instead. Changing things up A fairly common change in a Kubernetes API is to take some data that used to be unstructured or stored in some special string format, and change it to structured data. Did you know, that you can also control how kubectl prints your CRD as well? From this Go code, I am generating the CRD yaml. Short Names and Categories In this case, the api/v1/ directory is created, corresponding to the batch.tutorial.kubebuilder.io/v1 (remember our --domain setting from the beginning? Run make manifests to generate YAMLs for this CRD, kubebuilder will use the marker comments to add utilities, validation, etc. Status Subresource. The installation instructions can be found on kubebuilder installation docs Install kustomize Since kubebuilder internally relies on kustomize, hence we need to install that from the instructions here Now we're all set up to start building our controller Start the project I have initialized an empty go project go mod init cnat // The default value is 30. KubeBuilder is not intended to generate go openapi files, since they're not useful for CRDs (they're basically only useful for aggregated API servers, and even then you can just bundle in the JSON/YAML form and parse on init). First initialize the project with the Kubebuilder init command, --domain flag arg to specify the api group. Luckily, work is underway to make this much easier via code generation: the Kubebuilder projectsee "Kubebuilder" has developed crd-gen in sig.k8s.io/controller-tools, and this is being extended step by step so that it's usable in other contexts. Kubebuilder provides autocompletion support for Bash and Zsh via the command kubebuilder completion <bash|zsh>, which can save you a lot of typing. // This is a pointer to distinguish between explicit zero and not specified. . Change all usage of --max-workers to --max-concurrent-reconciles. Fields may use most of the primitive types. Implement an Operator through Kubebuilder. For example, the number of replicas it runs with. I want to assign default value for parameters 'Size' and 'Case' from one of the enum options. // Defaults to ChartVersion when omitted. . Overview. kubernetesapi. $ kubebuilder create webhook --group calculator --version v1 --kind Sum --programmatic-validation. metamagical.dev is my own domain; please use yours here . Today, we will outline an easy way to build an Operator using the Operator-Framework and SDK based on Kubebuilder. When you run make generate and make manifests, your KubeBuilder Markers are read in order to create RBAC roles, CRDs, and code. kubebuilder init --domain tutorial.kubebuilder.io Migrate APIs and Controllers. // +kubebuilder:default:=* // +optional Version string `json:"version,omitempty"` // The name and namespace of the v1beta2.Source the chart is available at. // +required SourceRef CrossNamespaceObjectReference `json:"sourceRef"` // Interval at which to check the The API version will be converted from v1alpha1 to v1beta1 and v1beta1 saved. Duration `json:"timeout,omitempty"` // GenerateName indicates that the release name should be generated. I use kubebuilder to define my own CRD like below, and it contains VolumeClaimTemplates filed which the type is [] . Generating CRD Kubebuilder provides a tool named controller-gen to generate manifests for CustomResourceDefinitions. ObjectMeta `json:"metadata,omitempty"` Spec ReverseWordsAppSpec `json:"spec,omitempty"` Status ReverseWordsAppStatus `json:"status,omitempty"`} // +kubebuilder:object:root=true // ReverseWordsAppList contains a list of ReverseWordsApp type ReverseWordsAppList struct {metav1. // +optional NameTemplate string `json:"nameTemplate,omitempty"` // Atomic . Our schedule field fits the bill quite nicely for this -- right now, in v1, our schedules look like Note that multiple versions may exist in storage if they were written before the storage version changes -- changing the storage version only affects how objects are created/updated after the change. I dug into fixing this and discussed with my team, did some digging in the core api types, it seems I may not be thinking about this right. The key thing to know here is that each of these markers, starting with // +kubebuilder, generate utility code (such as role-based access control) and Kubernetes YAML. The controller of the operator will now read the v1beta1 of the custom resource object. For example, the number of replicas it runs with. kubebuilder create api --group batch --version v1 --kind CronJob The first time we call this command for each group-version, it will create a directory for the new group-version. TypeMeta `json:",inline"` metav1. kubebuilder create api --group config --version v2 --kind ProjectConfig --resource --controller=false --make=false Use --controller=false You may notice this command from the CronJob tutorial although here we explicity setting --controller=false because ProjectConfig is not intended to be an API extension and cannot be reconciled. k8s.io/code-generatorCRDkubernetes-style API Kubebuilderinformerslistersclientsetscode-generatorKubebuilderControllerAdmission Webhookscode-generatorKubebuildermanifests yamlcode-generator By convention, the Kubernetes API makes a distinction between the specification of the desired state of an object (a nested object field called "spec") and the status of the object at the current time (a nested object field called "status"). Flag max-workers was renamed to max-concurrent-reconciles in Ansible and Helm operators. Follows an example. Remaining API Code Manage the Owned Resource When the project is created, you will be reminded whether to download the dependencies or not, and then you will find that most of the Kubernetes code is already in . 1. kubebuilder init --domain o0w0o.cn --owner "Hypo". In Kubernetes, we have a few rules for how we design APIs. The Spec here allows the user to customize the deployment created in various ways. Apple Silicon (M1) Kubebuilder can also be used to generate API reference documentation for non-kubebuilder projects, as long as the resources are annotated with // +kubebuilder:resource:path=<resource-name> the same as they are in kubebuilder projects.
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