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Sample-apiserverDemonstration of how to use the k8s.io/apiserver library to build a functional API server.Note: go-get or vendor this package as k8s.io/sample-apiserver. PurposeYou may use this code if you want to build an Extension API Server to use with API Aggregation, or to build a stand-alone Kubernetes-style API server.However, consider two other options:. CRDs: if you just want to add a resource to your kubernetes cluster, then consider using Custom Resource Definition a.k.a CRDs. They require less coding and rebasing.
Read about the differences between Custom Resource Definitions vs Extension API Servers. Apiserver-builder: If you want to build an Extension API server, consider using instead of this repo. The Apiserver-builder is a complete framework for generating the apiserver, client libraries, and the installation program.If you do decide to use this repository, then the recommended pattern is to fork this repository, modify it to add your types, and then periodically rebase your changes on top of this repo, to pick up improvements and bug fixes to the apiserver. CompatibilityHEAD of this repo will match HEAD of k8s.io/apiserver, k8s.io/apimachinery, and k8s.io/client-go.
Where does it come from?sample-apiserver is synced from.Code changes are made in that location, merged into k8s.io/kubernetes and later synced here. Fetch sample-apiserver and its dependenciesLike the rest of Kubernetes, sample-apiserver has usedand $GOPATH for years and isnow adopting go 1.11 modules.
There are thus two alternative ways togo about fetching this demo and its dependencies. Fetch with godepWhen NOT using go 1.11 modules, you can use the following commands. Git clone sample-apiserverNote, however, that if you intend tothen you will also need thecode-generator repo to exist in an old-style location. One easy wayto do this is to use the command go mod vendor to create andpopulate the vendor directory.
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A Note on kubernetes/kubernetesIf you are developing Kubernetes according tothen you already have a copy of this demo inkubernetes/staging/src/k8s.io/sample-apiserver and its dependencies- including the code generator - are in usable locations. Normal Build and Deploy Changes to the TypesIf you change the API object type definitions in any of thepkg/apis/./types.go files then you will need to update the filesgenerated from the type definitions. To do this, firstand then invoke hack/update-codegen.sh with sample-apiserver asyour current working directory; the script takes no arguments. Authentication pluginsThe normal build supports only a very spare selection ofauthentication methods. There is a much larger set available in. If you want your server to support one of those, such as oidc,then add an import of the appropriate package tosample-apiserver/main.go.
Here is an example. Import 'k8s.io/client-go/plugin/pkg/client/auth ' Build the BinaryWith sample-apiserver as your current working directory, issue thefollowing command: CGOENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o artifacts/simple-image/kube-sample-apiserverBuild the Container ImageWith sample-apiserver as your current working directory, issue thefollowing commands with MYPREFIX and MYTAG replaced by somethingsuitable. Docker build -t MYPREFIX/kube-sample-apiserver:MYTAG./artifacts/simple-imagedocker push MYPREFIX/kube-sample-apiserver:MYTAGDeploy into a Kubernetes ClusterEdit artifacts/example/deployment.yaml, updating the pod template's imagereference to match what you pushed and setting the imagePullPolicyto something suitable. Then call: kubectl apply -f artifacts/exampleRunning it stand-aloneDuring development it is helpful to run sample-apiserver stand-alone, i.e.
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Withouta Kubernetes API server for authn/authz and without aggregation. This is possible, but needsa couple of flags, keys and certs as described below. You will still need some kubeconfig,e.g. /.kube/config, but the Kubernetes cluster is not used for authn/z. A minikube orhack/local-up-cluster.sh cluster will work.Instead of trusting the aggregator inside kube-apiserver, the described setup uses localclient certificate based X.509 authentication and authorization.
This means that the clientcertificate is trusted by a CA and the passed certificate contains the group membershipto the system:masters group. As we disable delegated authorization with -authorization-skip-lookup,only this superuser group is authorized.First we need a CA to later sign the client certificate. Etcd &sample-apiserver -secure-port 8443 -etcd-servers -v=7 -client-ca-file ca.crt -kubeconfig /.kube/config -authentication-kubeconfig /.kube/config -authorization-kubeconfig /.kube/configThe first kubeconfig is used for the shared informers to accessKubernetes resources. The second kubeconfig passed to-authentication-kubeconfig is used to satisfy the delegatedauthenticator. The third kubeconfig passed to-authorized-kubeconfig is used to satisfy the delegatedauthorizer.
Neither the authenticator, nor the authorizer willactually be used: due to -client-ca-file, our development X.509certificate is accepted and authenticates us as system:mastersmember. System:masters is the superuser group such that delegatedauthorization is skipped.Use curl to access the server using the client certificate in p12 format for authentication.
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January 2023
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