Kubernetes API - deep dive into the kube-apiserver

Feb 7, 20173 likes2,168 views

The document discusses the Kubernetes API server and its RESTful HTTP API. It describes the API endpoints for accessing different Kubernetes resources, how API groups and versions are organized, how API requests are routed and processed, how Kubernetes objects are converted between different versions, and how storage and code generation are used.

Kubernetes API
DEEP DIVE INTO THE APISERVER
Dr. Stefan Schimanski, sttts@redhat.com

Restful
http API
/
/version
/api
/api/v1/pods
/api/v1/pods/status
/apis
/apis/batch
/apis/batch/v1alpha1
/apis/batch/v1alpha1/jobs
/apis/batch/v1alpha1/cronjobs
/apis/batch/v1beta1
/apis/batch/v1beta1/jobs
kube-apiserver $ kubectl create -f foo.yaml

Restful
http API
/
/version
/api
/api/v1/pods
/api/v1/pods/status
/apis
/apis/batch
/apis/batch/v2alpha1
/apis/batch/v2alpha1/jobs
/apis/batch/v2alpha1/cronjobs
/apis/batch/v1beta1
/apis/batch/v1beta1/jobs

Restful
http API
mux
k8s.io/apiserver/pkg/endpoints.APIGroupVersion.InstallREST
AddSupportedResourcesWebService – /apis/batch/v2alpha1
k8s.io/apiserver/pkg/endpoints.APIInstaller.Install
/apis/batch/v2alpha1/jobs
/apis/batch/v2alpha1/cronjobs
...
pkg/apis/batch
type Jobs struct
pkg/apis/batch/v2alpha1
type Jobs struct
api.Scheme
k8s.io/apiserver
pkg/api
api.Scheme.Convert(&internalJob, &v2alohaJob)
/apis/batch/v2alpha1/jobs
GET
PUT
POST
DELETE
...
/status
/scale
/proxy
...
subresources

Restful
http API
mux
pkg/apis/batch
type Jobs struct
pkg/apis/batch/v2alp
ha1
type Jobs struct
api.Sche
me api.Scheme.Convert(&job, &v1job)
POST
/apis/batch/v2alpha1/jobs
k8s.io/apiserver
pkg/endpoints/handlers.CreateNamedResource
binary
JSON
payload
Go struct
v2alpha1.Job
HTTP
Request
Go struct
internal.Job
Store
k8s.io/apiserver
pkg/registry/generic
Storage
k8s.io/apiserver
pkg/storage/etcd3
ProtoBuf
Job
Go struct
v2alpha1.Job
etcd

type Scheme struct
• AddKnownTypes(gv, obj Object)
• Default(src Object)
• Copy(src Object) Object
• Convert(in, out interface{})
• New(gvk) Object
ApiGroup
pkg/apis/batch
pkg/apis/batch/v1
pkg/apis/batch/v2alpha1
pkg/apis/batch/register.go
pgk/apis/batch/install
Group
Version
Kind
Resource
type Object interface
• GetObjectKind() string
client-go/pkg/api.Scheme
client-go/pkg/api.Codecs
Discovery
type APIGroupList struct
type APIVersions struct
type APIResourceList struct
GroupVersionKind „gvk“
GroupVersionResource
Unversioned types
Unstructured
List
Registry / Storage
type Storage interface
type Lister interface
type Updater interface
type Getter interface
type Deleter interface
....
deepcopy-gen
conversion-gen
defaulting-gen
Code Generation
type OwnerReference struct
type ObjectReference struct
type TypeMeta struct
type ObjectMeta struct
Meta
api.Scheme
api.Codecs
api.Registry
api.GroupFactoryRegistry
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Kubernetes API - deep dive into the kube-apiserver

1. Kubernetes API DEEP DIVE INTO THE APISERVER Dr. Stefan Schimanski, [email protected]

2. Restful http API / /version /api /api/v1/pods /api/v1/pods/status /apis /apis/batch /apis/batch/v1alpha1 /apis/batch/v1alpha1/jobs /apis/batch/v1alpha1/cronjobs /apis/batch/v1beta1 /apis/batch/v1beta1/jobs kube-apiserver $ kubectl create -f foo.yaml

3. Restful http API / /version /api /api/v1/pods /api/v1/pods/status /apis /apis/batch /apis/batch/v2alpha1 /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjobs /apis/batch/v1beta1 /apis/batch/v1beta1/jobs

4. Restful http API / /version /api /api/v1/pods /api/v1/pods/status /apis /apis/batch /apis/batch/v2alpha1 /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjo /apis/batch/v1beta1 /apis/batch/v1beta1/jobs

5. Restful http API / /version /api /api/v1/pods /api/v1/pods/status /apis /apis/batch /apis/batch/v2alpha1 /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjo /apis/batch/v1beta1 /apis/batch/v1beta1/jobs /apis/batch/v2alpha1/jobs Group Version ResourceHTTP paths: In Go: gvk := schema.GroupVersionKind{Group: “batch“, Version: “v2alpha1“, Kind: “Job“} obj := api.Schema.New(gvk) codec := api.Codecs.LegacyCodec(gvk.GroupVersion()) codec.Decode(reqBody, gvk, obj) type Job struct { metav1.TypeMeta metav1.ObjectMeta Spec JobSpec Status JobStatus } pkg/apis/batch/v2alpha1/types.go type TypeMeta struct { Kind string APIVersion string } type ObjectMeta struct { Name string ... }

6. Restful http API / /version /api /api/v1/pods /api/v1/pods/status /apis /apis/batch /apis/batch/v2alpha1 /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjo /apis/batch/v1beta1 /apis/batch/v1beta1/jobs MaxInFlightLimit TimeoutForNonLongRunningRequests Panic Recovery CORS Authentication Audit Impersonation Authorization k8s.io/apiserver/pkg/server. DefaultBuildHandlerChain „Filters“ k8s.io/apiserver/pkg/server/routes/index.go – / k8s.io/apiserver/pkg/server/routes/version.go – /version k8s.io/apiserver/pkg/server/routes/swagger.go – /swaggerapi k8s.io/apiserver/pkg/server/routes/openapi.go – /swagger.json „Routes“ mux k8s.io/apiserver/pkg/endpoints.APIGroupVersion.InstallREST AddSupportedResourcesWebService – /apis/batch/v2alpha1 k8s.io/apiserver/pkg/endpoints.APIInstaller.Install /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjobs ... WithRequestInfo ctx.RequestInfo

7. Restful http API mux k8s.io/apiserver/pkg/endpoints.APIGroupVersion.InstallREST AddSupportedResourcesWebService – /apis/batch/v2alpha1 k8s.io/apiserver/pkg/endpoints.APIInstaller.Install /apis/batch/v2alpha1/jobs /apis/batch/v2alpha1/cronjobs ... pkg/apis/batch type Jobs struct pkg/apis/batch/v2alpha1 type Jobs struct api.Scheme k8s.io/apiserver pkg/api api.Scheme.Convert(&internalJob, &v2alohaJob) /apis/batch/v2alpha1/jobs GET PUT POST DELETE ... /status /scale /proxy ... subresources

8. Restful http API mux pkg/apis/batch type Jobs struct pkg/apis/batch/v2alp ha1 type Jobs struct api.Sche me api.Scheme.Convert(&job, &v1job) POST /apis/batch/v2alpha1/jobs k8s.io/apiserver pkg/endpoints/handlers.CreateNamedResource binary JSON payload Go struct v2alpha1.Job HTTP Request Go struct internal.Job Store k8s.io/apiserver pkg/registry/generic Storage k8s.io/apiserver pkg/storage/etcd3 ProtoBuf Job Go struct v2alpha1.Job etcd

9. type Scheme struct • AddKnownTypes(gv, obj Object) • Default(src Object) • Copy(src Object) Object • Convert(in, out interface{}) • New(gvk) Object ApiGroup pkg/apis/batch pkg/apis/batch/v1 pkg/apis/batch/v2alpha1 pkg/apis/batch/register.go pgk/apis/batch/install Group Version Kind Resource type Object interface • GetObjectKind() string client-go/pkg/api.Scheme client-go/pkg/api.Codecs Discovery type APIGroupList struct type APIVersions struct type APIResourceList struct GroupVersionKind „gvk“ GroupVersionResource Unversioned types Unstructured List Registry / Storage type Storage interface type Lister interface type Updater interface type Getter interface type Deleter interface .... deepcopy-gen conversion-gen defaulting-gen Code Generation type OwnerReference struct type ObjectReference struct type TypeMeta struct type ObjectMeta struct Meta api.Scheme api.Codecs api.Registry api.GroupFactoryRegistry Globals

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