使用client-go自定义开发Kubernetes

参考链接：使用client-go自定义开发Kubernetes

1.本地运行 apiserver demo

[root@wangjq demo]# apiserver-boot run local
2019/09/26 09:18:35 regenerating generated code.  To disable regeneration, run with --generate=false.
/var/wangjq/golang/bin/bin/apiregister-gen --input-dirs demo/pkg/apis/... --input-dirs demo/pkg/controller/...
/var/wangjq/golang/bin/bin/conversion-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt -O zz_generated.conversion --extra-peer-dirs k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/conversion,k8s.io/apimachinery/pkg/runtime
/var/wangjq/golang/bin/bin/deepcopy-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt -O zz_generated.deepcopy
/var/wangjq/golang/bin/bin/openapi-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt -i k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/api/resource,k8s.io/apimachinery/pkg/version,k8s.io/apimachinery/pkg/runtime,k8s.io/apimachinery/pkg/util/intstr,k8s.io/api/admission/v1beta1,k8s.io/api/admissionregistration/v1alpha1,k8s.io/api/admissionregistration/v1beta1,k8s.io/api/apps/v1,k8s.io/api/apps/v1beta1,k8s.io/api/apps/v1beta2,k8s.io/api/authentication/v1,k8s.io/api/authentication/v1beta1,k8s.io/api/authorization/v1,k8s.io/api/authorization/v1beta1,k8s.io/api/autoscaling/v1,k8s.io/api/autoscaling/v2beta1,k8s.io/api/batch/v1,k8s.io/api/batch/v1beta1,k8s.io/api/batch/v2alpha1,k8s.io/api/certificates/v1beta1,k8s.io/api/core/v1,k8s.io/api/events/v1beta1,k8s.io/api/extensions/v1beta1,k8s.io/api/imagepolicy/v1alpha1,k8s.io/api/networking/v1,k8s.io/api/policy/v1beta1,k8s.io/api/rbac/v1,k8s.io/api/rbac/v1alpha1,k8s.io/api/rbac/v1beta1,k8s.io/api/scheduling/v1alpha1,k8s.io/api/settings/v1alpha1,k8s.io/api/storage/v1,k8s.io/api/storage/v1alpha1,k8s.io/api/storage/v1beta1,k8s.io/api/core/v1 --output-package demo/pkg/openapi
/var/wangjq/golang/bin/bin/defaulter-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt -O zz_generated.defaults --extra-peer-dirs= k8s.io/apimachinery/pkg/apis/meta/v1,k8s.io/apimachinery/pkg/conversion,k8s.io/apimachinery/pkg/runtime
/var/wangjq/golang/bin/bin/client-gen -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt --input-base demo/pkg/apis --input demo/v1 --clientset-path demo/pkg/client/clientset_generated --clientset-name clientset
/var/wangjq/golang/bin/bin/client-gen -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt --input-base demo/pkg/apis --input demo --clientset-path demo/pkg/client/clientset_generated --clientset-name internalclientset
/var/wangjq/golang/bin/bin/lister-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt --output-package demo/pkg/client/listers_generated
/var/wangjq/golang/bin/bin/informer-gen --input-dirs demo/pkg/apis/demo/v1 --input-dirs demo/pkg/apis/demo -o /var/wangjq/golang/src --go-header-file boilerplate.go.txt --output-package demo/pkg/client/informers_generated --listers-package demo/pkg/client/listers_generated --versioned-clientset-package demo/pkg/client/clientset_generated/clientset --internal-clientset-package demo/pkg/client/clientset_generated/internalclientset
2019/09/26 09:19:04 CGO_ENABLED=0
go build -o bin/apiserver cmd/apiserver/main.go
go build -o bin/controller-manager cmd/controller-manager/main.go
etcd
bin/apiserver --etcd-servers=http://localhost:2379 --secure-port=9443 --delegated-auth=false
W0926 09:19:16.495764    2406 authorization.go:34] Authorization is disabled
W0926 09:19:16.495828    2406 authentication.go:56] Authentication is disabled
I0926 09:19:16.504351    2406 logs.go:41] Defaulting fields for Bird bird-example
I0926 09:19:16.540151    2406 serve.go:89] Serving securely on [::]:9443
I0926 09:19:17.502752    2406 logs.go:41] Defaulting fields for Bird bird-example
to test the server run `kubectl --kubeconfig kubeconfig api-versions`
bin/controller-manager --kubeconfig=kubeconfig
2019-09-26 09:19:18.036499 I | Running reconcile Bird for bird-example

2.验证apiserver是否运行正常

[root@wangjq demo]# kubectl --kubeconfig kubeconfig api-versions
demo.xxx.com/v1

3.client-go源代码（创建，删除，更新，获取）

package main

import (
    birdApiv1 "demo/pkg/apis/demo/v1"
    clientset "demo/pkg/client/clientset_generated/clientset"
    "encoding/json"
    "fmt"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    schema "k8s.io/apimachinery/pkg/runtime/schema"
    restclient "k8s.io/client-go/rest"
)

var url = "127.0.0.1:9443"
var newName string = "client-go-demo"

type ResourceHandler struct {
    client *DemoClient
}

type DemoClient struct {
    Client *clientset.Clientset
}

func newResourceHandler() *ResourceHandler {
    return &ResourceHandler{client: NewDemoClient()}
}

func NewDemoClient() *DemoClient {
    c := &DemoClient{}
    c.Client = clientset.NewForConfigOrDie(&restclient.Config{
        Host: url,
        TLSClientConfig: restclient.TLSClientConfig{
            Insecure: true,
        },
        APIPath: "/apis/demo.xxx.com",
        ContentConfig: restclient.ContentConfig{
            GroupVersion: &schema.GroupVersion{
                Group:   "demo",
                Version: "v1",
            }}})
    fmt.Println(c.Client)
    return c
}

func (c *ResourceHandler) CreateBird() {
    namespace := &birdApiv1.Bird{
        ObjectMeta: metav1.ObjectMeta{
            Name: newName,
            UID:  "aead7663-a7b6-471a-a222-a94c41a99999",
        },
        Status: birdApiv1.BirdStatus{},
        Spec: birdApiv1.BirdSpec{
            Datetime:      "2018-06-14T18:00:00Z03:00",
            AwayTeamGoals: 9,
            AwayTeam:      "wangjq",
            HomeTeam:      "demo",
            HomeTeamGoals: 10,
        },
    }
    _, err := c.client.Client.DemoV1().Birds("default").Create(namespace)
    if err != nil {
        panic(err)
    }
}

func (c *ResourceHandler) DeleteBird(name string) {
    if err := c.client.Client.DemoV1().Birds("default").Delete(name, &metav1.DeleteOptions{}); err != nil {
        panic(err)
    }
}

func (c *ResourceHandler) UpdateBird(name string) {
    result := c.GetBird(name)

    result.Spec.AwayTeam = "zzzzz"
    result.Spec.Datetime = "2222-12-22T22:22:00Z03:22"
    result.Spec.HomeTeam = "zzzzz"
    c.client.Client.DemoV1().Birds("default").Update(result)
}

func (c *ResourceHandler) ListBirds() {
    fmt.Println("============================ List All ============================")
    podList, _ := c.client.Client.DemoV1().Birds("default").List(metav1.ListOptions{})
    fmt.Println("podList: ", len(podList.Items))
    for key, value := range podList.Items {
        fmt.Println("第", key+1, "个pod.................")
        bytes, err := json.Marshal(value)
        if err != nil {
            return
        }
        fmt.Println(string(bytes))

        fmt.Println("##################################################")
        fmt.Printf("AwayTeam: %s
", value.Spec.AwayTeam)
        fmt.Printf("AwayTeamGoals: %s
", value.Spec.AwayTeamGoals)
        fmt.Printf("Datetime: %s
", value.Spec.Datetime)
        fmt.Printf("HomeTeam: %s
", value.Spec.HomeTeam)
        fmt.Printf("HomeTeamGoals: %s
", value.Spec.HomeTeamGoals)
        fmt.Println("##################################################")
    }
    for _, pod := range podList.Items {
        fmt.Printf("Name: %s, Status: %s, CreateTime: %s, Uid: %s
",
            pod.ObjectMeta.Name, pod.Status, pod.ObjectMeta.CreationTimestamp, pod.GetUID())
    }
}   

func (c *ResourceHandler) GetBird(name string) *birdApiv1.Bird {
    result, err := c.client.Client.DemoV1().Birds("default").Get(name, metav1.GetOptions{})
    if err != nil {
        panic(err)
    }
    return result
}

func main() {
    resourceHandler := newResourceHandler()

    resourceHandler.ListBirds()
    resourceHandler.CreateBird()
    resourceHandler.ListBirds()
    resourceHandler.UpdateBird(newName)
    resourceHandler.ListBirds()
    resourceHandler.DeleteBird(newName)
    resourceHandler.ListBirds()
}

4.运行测试

[root@wangjq demo]# go run client-demo.go 
&{0xc000292d40 0xc0002a3970}
============================ List All ============================
podList:  0
============================ List All ============================
podList:  1
第 1 个pod.................
{"metadata":{"name":"client-go-demo","namespace":"default","selfLink":"/apis/demo.xxx.com/v1/namespaces/default/birds/client-go-demo","uid":"4264dd63-eb30-11e9-86cf-5098b81a3139","resourceVersion":"2013","generation":1,"creationTimestamp":"2019-10-10T07:33:31Z"},"spec":{"datetime":"2018-06-14T18:00:00Z03:00","homeTeam":"demo","homeTeamGoals":10,"awayTeam":"wangjq","awayTeamGoals":9},"status":{}}
##################################################
AwayTeam: wangjq
AwayTeamGoals: %!s(int=9)
Datetime: 2018-06-14T18:00:00Z03:00
HomeTeam: demo
HomeTeamGoals: %!s(int=10)
##################################################
Name: client-go-demo, Status: {}, CreateTime: 2019-10-10 15:33:31 +0800 HKT, Uid: 4264dd63-eb30-11e9-86cf-5098b81a3139
============================ List All ============================
podList:  1
第 1 个pod.................
{"metadata":{"name":"client-go-demo","namespace":"default","selfLink":"/apis/demo.xxx.com/v1/namespaces/default/birds/client-go-demo","uid":"4264dd63-eb30-11e9-86cf-5098b81a3139","resourceVersion":"2014","generation":2,"creationTimestamp":"2019-10-10T07:33:31Z"},"spec":{"datetime":"2222-12-22T22:22:00Z03:22","homeTeam":"zzzzz","homeTeamGoals":10,"awayTeam":"zzzzz","awayTeamGoals":9},"status":{}}
##################################################
AwayTeam: zzzzz
AwayTeamGoals: %!s(int=9)
Datetime: 2222-12-22T22:22:00Z03:22
HomeTeam: zzzzz
HomeTeamGoals: %!s(int=10)
##################################################
Name: client-go-demo, Status: {}, CreateTime: 2019-10-10 15:33:31 +0800 HKT, Uid: 4264dd63-eb30-11e9-86cf-5098b81a3139
============================ List All ============================
podList:  0