client-go gin的简单整合十-Update

Posted 2022-08-16 saynaihe

tags:

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背景

完成了client-go gin的简单整合九-Create的namespace deployment pod的创建操作，现在进行一下update修改的操作！

update namespace

以某 ns为例增加一个标签

关于namespace，我们用的最多的标签是name 和labels(恩前面我还做过配额的例子，这里就简单的拿labels为例了)

[zhangpeng@zhangpeng k8s-demo1]$ kubectl get ns --show-labels
NAME              STATUS   AGE     LABELS
default           Active   53d     kubernetes.io/metadata.name=default
kube-node-lease   Active   53d     kubernetes.io/metadata.name=kube-node-lease
kube-public       Active   53d     kubernetes.io/metadata.name=kube-public
kube-system       Active   53d     kubernetes.io/metadata.name=kube-system
zhangpeng         Active   1s      kubernetes.io/metadata.name=zhangpeng
zhangpeng1        Active   3h21m   kubernetes.io/metadata.name=zhangpeng1

如果去update修改namespace我们常用的应该是修改namespace的labels，以zhangpeng namespace为例，我想增加一个name=abcd的标签
/src/service/Namespace.go

package service

import (
	"context"
	"fmt"
	"github.com/gin-gonic/gin"
	. "k8s-demo1/src/lib"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"time"
)

type Time struct 
	time.Time `protobuf:"-"`

type Namespace struct 
	Name        string            `json:"name"`
	CreateTime  time.Time         `json:"CreateTime"`
	Status      string            `json:"status"`
	Labels      map[string]string `json:"labels"`
	Annotations map[string]string `json:"annotations"`


func ListNamespace(g *gin.Context) 
	ns, err := K8sClient.CoreV1().Namespaces().List(context.Background(), metav1.ListOptions)
	if err != nil 
		g.Error(err)
		return
	
	ret := make([]*Namespace, 0)
	for _, item := range ns.Items 
		ret = append(ret, &Namespace
			Name:       item.Name,
			CreateTime: item.CreationTimestamp.Time,
			Status:     string(item.Status.Phase),
			Labels:     item.Labels,
		)

	
	g.JSON(200, ret)
	return

func create(ns Namespace) (*v1.Namespace, error) 
	ctx := context.Background()
	newNamespace, err := K8sClient.CoreV1().Namespaces().Create(ctx, &v1.Namespace
		ObjectMeta: metav1.ObjectMeta
			Name:   ns.Name,
			Labels: ns.Labels,
		,
	, metav1.CreateOptions)
	if err != nil 
		fmt.Println(err)
	
	return newNamespace, err

func updatenamespace(ns Namespace) (*v1.Namespace, error) 
	ctx := context.Background()
	newNamespace, err := K8sClient.CoreV1().Namespaces().Update(ctx, &v1.Namespace
		ObjectMeta: metav1.ObjectMeta
			Name:   ns.Name,
			Labels: ns.Labels,
		,
	, metav1.UpdateOptions)
	if err != nil 
		fmt.Println(err)
	
	return newNamespace, err

func CreateNameSpace(g *gin.Context) 
	var nameSpace Namespace
	if err := g.ShouldBind(&nameSpace); err != nil 
		g.JSON(500, err)
	
	namespace, err := create(nameSpace)
	if err != nil 
		g.JSON(500, err)
	
	ns := Namespace
		Name:        namespace.Name,
		CreateTime:  namespace.CreationTimestamp.Time,
		Status:      string(namespace.Status.Phase),
		Labels:      nil,
		Annotations: nil,
	
	g.JSON(200, ns)

func UpdateNameSpace(g *gin.Context) 
	var nameSpace Namespace
	if err := g.ShouldBind(&nameSpace); err != nil 
		g.JSON(500, err)
	
	namespace, err := updatenamespace(nameSpace)
	if err != nil 
		g.JSON(500, err)
	
	ns := Namespace
		Name:        namespace.Name,
		CreateTime:  namespace.CreationTimestamp.Time,
		Status:      string(namespace.Status.Phase),
		Labels:      namespace.Labels,
		Annotations: nil,
	
	g.JSON(200, ns)

创建updatenamespace方法 UpdateNameSpace service
main.go创建路由：

package main

import (
	"github.com/gin-gonic/gin"
	"k8s-demo1/src/core"
	"k8s-demo1/src/service"
	//	"k8s.io/client-go/informers/core"
)

func main() 
	r := gin.Default()
	r.GET("/", func(context *gin.Context) 
		context.JSON(200, "hello")
	)
	r.GET("/namespaces", service.ListNamespace)
	r.POST("/namespace", service.CreateNameSpace)
	r.POST("/namespace/update", service.UpdateNameSpace)
	r.GET("/deployments", service.ListDeployment)
	r.GET("/service", service.ListService)
	r.GET("pods", service.ListallPod)
	r.POST("/pod", service.CreatePod)
	r.POST("/deployment", service.CreateDep)
	core.InitDeployment()
	r.Run()

运行main.go

Postman 测试

post http://127.0.0.1:8080/namespace/update

"name":"zhangpeng",
"labels":"name":"abcd"

[zhangpeng@zhangpeng k8s-demo1]$ kubectl get ns --show-labels

修改name标签为其他值

post http://127.0.0.1:8080/namespace/update

"name":"zhangpeng",
"labels":"name":"abcd123"

其他的可以玩的：扩展一下resourcequotas，可以参照这个的搞一下quota的配置，这里就不先演示了呢！

update pod?

pod是否可以update更新呢？

pod是否可以update更新呢？答案是否定的…
注：pod是一个容器的生命周期，理论上是不可以更新的，而且一般的pod 是基于基于deployment or rs等控制管理pod的，修改则意为着生命周期的结束和新的pod的产生，当然了可以基于openkruise的其他的应用实现pod的原地升级！

依着葫芦画瓢，体验一下错误

[zhangpeng@zhangpeng k8s]$ kubectl get pods -n zhangpeng
NAME        READY   STATUS    RESTARTS   AGE
zhangpeng   1/1     Running   0          78m

[zhangpeng@zhangpeng k8s-demo1]$ kubectl get pods -o yaml -n zhangpeng
apiVersion: v1
items:
- apiVersion: v1
  kind: Pod
  metadata:
    creationTimestamp: "2022-06-22T02:31:49Z"
    name: zhangpeng
    namespace: zhangpeng
    resourceVersion: "6076576"
    uid: cee39c9d-fc29-40ee-933e-d9fa76ba20e1
  spec:
    containers:
    - image: nginx
      imagePullPolicy: Always
      name: zhangpeng
      resources: 
      terminationMessagePath: /dev/termination-log
      terminationMessagePolicy: File
      volumeMounts:
      - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
        name: kube-api-access-f7qvv
        readOnly: true
    dnsPolicy: ClusterFirst
    enableServiceLinks: true
    nodeName: k8s-2
    preemptionPolicy: PreemptLowerPriority
    priority: 0
    restartPolicy: Always
    schedulerName: default-scheduler
    securityContext: 
    serviceAccount: default
    serviceAccountName: default
    terminationGracePeriodSeconds: 30
    tolerations:
    - effect: NoExecute
      key: node.kubernetes.io/not-ready
      operator: Exists
      tolerationSeconds: 300
    - effect: NoExecute
      key: node.kubernetes.io/unreachable
      operator: Exists
      tolerationSeconds: 300
    volumes:
    - name: kube-api-access-f7qvv
      projected:
        defaultMode: 420
        sources:
        - serviceAccountToken:
            expirationSeconds: 3607
            path: token
        - configMap:
            items:
            - key: ca.crt
              path: ca.crt
            name: kube-root-ca.crt
        - downwardAPI:
            items:
            - fieldRef:
                apiVersion: v1
                fieldPath: metadata.namespace
              path: namespace
  status:
    conditions:
    - lastProbeTime: null
      lastTransitionTime: "2022-06-22T02:31:49Z"
      status: "True"
      type: Initialized
    - lastProbeTime: null
      lastTransitionTime: "2022-06-22T02:32:06Z"
      status: "True"
      type: Ready
    - lastProbeTime: null
      lastTransitionTime: "2022-06-22T02:32:06Z"
      status: "True"
      type: ContainersReady
    - lastProbeTime: null
      lastTransitionTime: "2022-06-22T02:31:49Z"
      status: "True"
      type: PodScheduled
    containerStatuses:
    - containerID: docker://47d2c805f72cd023ff9b33d46f63b1b8e7600f64783685fe4c16d97f4b58b290
      image: nginx:latest
      imageID: docker-pullable://nginx@sha256:0d17b565c37bcbd895e9d92315a05c1c3c9a29f762b011a10c54a66cd53c9b31
      lastState: 
      name: zhangpeng
      ready: true
      restartCount: 0
      started: true
      state:
        running:
          startedAt: "2022-06-22T02:32:05Z"
    hostIP: 192.168.0.176
    phase: Running
    podIP: 10.244.1.64
    podIPs:
    - ip: 10.244.1.64
    qosClass: BestEffort
    startTime: "2022-06-22T02:31:49Z"
kind: List
metadata:
  resourceVersion: ""

/src/service/Pod.go
注：模仿deployment create写的…反正结果都是失败的，就走一遍流程看一下！后面都是要删掉的…

func (d *Pod) GetImageName() string 
	// 全部为应为字母数字和:
	pods := strings.Index(d.Images, ":")
	if pods > 0 
		return d.Images[:pods]
	
	return d.Images

func updatepod(pod Pod) (*corev1.Pod, error) 
	newpod, err := K8sClient.CoreV1().Pods(pod.Namespace).Update(context.TODO(), &corev1.Pod
		ObjectMeta: metav1.ObjectMeta
			Name:        pod.Name,
			Namespace:   pod.Namespace,
			Labels:      pod.Labels,
			Annotations: pod.Annotations,
		,
		Spec: corev1.PodSpec
			Containers: []corev1.Container
				Name: pod.Name, Image: pod.Images, Ports: pod.GetPorts(),
			,
		,
	, metav1.UpdateOptions)
	if err != nil 
		fmt.Println(err)
	
	return newpod, err

func UpdatePod(g *gin.Context) 
	var NewPod Pod
	if err := g.ShouldBind(&NewPod); err != nil 
		g.JSON(500, err)
	
	pod, err := updatepod(NewPod)
	if err != nil 
		g.JSON(500, err)
	
	newpod := Pod
		Namespace:   pod.Namespace,
		Name:        pod.Name,
		Images:      pod.Spec.Containers[0].Image,
		CreateTime:  pod.CreationTimestamp.Format("2006-01-02 15:04:05"),
		Annotations: pod.ObjectMeta.Annotations,
	
	g.JSON(200, newpod)

main.go增加如下配置：

	r.POST("/pod/update", service.UpdatePod)

运行main.go postman测试：

恩大概就是这个样子就为了演示一下，更深入理解一下pod生命周期，当然了也可以去研究一下那些原地升级的方法openkruise还是很不错的！

update deployment

初始deployment为下

[zhangpeng@zhangpeng k8s]$ kubectl get pods -n zhangpeng
NAME                         READY   STATUS    RESTARTS   AGE
zhangpeng-5dffd5664f-nvfsm   1/1     Running   0          27s
[zhangpeng@zhangpeng k8s]$ kubectl get deployment zhangpeng -n zhangpeng
NAME        READY   UP-TO-DATE   AVAILABLE   AGE
zhangpeng   1/1     1            1           40s

[zhangpeng@zhangpeng k8s]$ kubectl get deployment zhangpeng -n zhangpeng -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2022-06-22T06:44:06Z"
  generation: 1
  name: zhangpeng
  namespace: zhangpeng
  resourceVersion: "6096527"
  uid: d42d5851-2e63-439b-b2a5-976b5fe246bb
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: zhangpeng
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: zhangpeng
      name: zhangpeng
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        ports:
        - containerPort: 80
          name: web
          protocol: TCP
        resources: 
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: 
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 1
  conditions:
  - lastTransitionTime: "2022-06-22T06:44:24Z"
    lastUpdateTime: "2022-06-22T06:44:24Z"
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: "2022-06-22T06:44:06Z"
    lastUpdateTime: "2022-06-22T06:44:24Z"
    message: ReplicaSet "zhangpeng-5dffd5664f" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 1
  readyReplicas: 1
  replicas: 1
  updatedReplicas: 1

关键词就是：

"name":"zhangpeng",
"namespace":"zhangpeng",
"replicas":1,
"ports":"tcp,80,web",
"images":"nginx"

编写程序文件

/src/service/Deployment.go

func Updatedep(dep Deployment) (*v1.Deployment, error) 
	deployment := &v1.Deployment
		ObjectMeta: metav1.ObjectMeta
			Name:      dep.Name,
			Namespace: dep.Namespace,
			Labels:    dep.GetLabels(),
		,
		Spec: v1.DeploymentSpec
			Replicas: &dep.Replicas,
			Selector: &metav1.LabelSelector
				MatchLabels: dep.GetSelectors(),
			,
			Template: corev1.PodTemplateSpec
				ObjectMeta: metav1.ObjectMeta
					Name:   dep.Name,
					Labels: dep.GetSelectors(),
				,
				Spec: corev1.PodSpec
					Containers: []corev1.Container
						
							Name:  dep.GetImageName(),
							Image: dep.Images,
							Ports: dep.GetPorts(),
						,
					,
				,
			,
		,
	
	ctx := context.Background()
	newdep, err := lib.K8sClient.AppsV1().Deployments(dep.Namespace).Update(ctx, deployment, metav1.UpdateOptions)
	if err != nil 
		fmt.Println(err)
	
	return newdep, nil

func UpdateDep(g *gin.Context) 
	var newDep Deployment
	if err := g.ShouldBind(&newDep); err != nil 
		g.JSON(500, err)
	
	newdep, err := Updatedep(newDep)
	if err != nil 
		g.JSON(500, err)
	
	newDep1 := Deployment
		Namespace:  newdep.Namespace,
		Name:       newdep.Name,
		Pods:       GetPodsByDep(*newdep),
		CreateTime: newdep.CreationTimestamp.Format("2006-01-02 15:03:04"),
	
	g.JSON(200, newDep1)

注意：基本就是拿前面的deployment create的方法改的…

增加路由运行main.go

main.go增加路由并运行main.go

	r.POST("/deployment/update", service.UpdateDep)

Postman测试

修改副本为2

http://127.0.0.1:8080/deployment/update

"name":"zhangpeng",
"namespace":"zhangpeng",
"replicas":2,
"ports":"tcp,80,web",
"images":"nginx"

修改镜像tag

开始想的是修改nginx为nginx:1.18结果失败了…

估计是images数据格式的问题，先忽略吧…退而求其次修改镜像为apache镜像（注意镜像是httpd）
http://127.0.0.1:8080/deployment/update

"name":"zhangpeng",
"namespace":"zhangpeng",
"replicas":2,
"ports":"tcp,80,web",
"images":"httpd"

登陆服务器验证：

zhangpeng@zhangpeng k8s]$ kubectl get pods -n zhangpeng
NAME                         READY   STATUS              RESTARTS   AGE
zhangpeng-5546976d9-mkslb    1/1     Running             0          73s
zhangpeng-5546976d9-tcsb5    0/1     ContainerCreating   0          14s
zhangpeng-5dffd5664f-nvfsm   1/1     Running             0          18m
[zhangpeng@zhangpeng k8s]$ kubectl get pods -n zhangpeng
NAME                        READY   STATUS    RESTARTS   AGE
zhangpeng-5546976d9-mkslb   1/1     Running   0          100s
zhangpeng-5546976d9-tcsb5   1/1     Running   0          41s
[zhangpeng@zhangpeng k8s]$ kubectl get deployment -n zhangpeng -o yaml |grep image
        - image: httpd
          imagePullPolicy: Always

总结：

1.Pod生命周期
2.update与create比就修改了update metav1.UpdateOptions
3.镜像的tag标签的问题后面看一下怎么解决

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