Go语言开发k8s-03-Deployment操作
文章目录
- 1. 结构体
-
- 1.1 DeploymentList
- 1.2 Deployment
- 1.3 TypeMeta
- 1.4 ObjectMeta（metadata）
- 1.5 DeploymentSpec（spec）
-
- 1） Replicas（spec.replicas）
- 2）LabelSelector（spec.selector）
- 3）PodTemplateSpec（spec.template）
- 4）ObjectMeta （spec.template.metadata）
- 5）Spec（spec.template.spec）
- 1.6 DeploymentStatus
- 1.7 对照yml文件示例
- 2. Deployment list
-
- 语法
- 完整示例
- 3. Get Deployment
-
- 语法
- 完整示例
- 4. Create Deployment
-
- 语法示例
- 完整示例
- 5. PUT Deployment
-
- 语法
- 完整示例（修改镜像）
- 完整示例（修改副本数）
- 6. Delete Deployment
-
- 语法
- 完整示例
1. 结构体
1.1 DeploymentList
所属包：“k8s.io/api/apps/v1”
type DeploymentList struct {
v1.TypeMeta `json:",inline"`
v1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
Items []Deployment `json:"items" protobuf:"bytes,2,rep,name=items"`
}
其中Items的每个成员的结构体Deployment 如下：
1.2 Deployment
所属包：“k8s.io/api/apps/v1”
type Deployment struct {
v1.TypeMeta `json:",inline"`
v1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
Spec DeploymentSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
Status DeploymentStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}
其中各成员结构体如下：
1.3 TypeMeta
所属包 “k8s.io/apimachinery/pkg/apis/meta/v1”
type TypeMeta struct {
Kind string `json:"kind,omitempty" protobuf:"bytes,1,opt,name=kind"`
APIVersion string `json:"apiVersion,omitempty" protobuf:"bytes,2,opt,name=apiVersion"`
}
对应k8s的yml文件
apiVersion: apps/v1
kind: Deployment
1.4 ObjectMeta（metadata）
所属包： “k8s.io/apimachinery/pkg/apis/meta/v1”
type ObjectMeta struct {
Name string `json:"name,omitempty" protobuf:"bytes,1,opt,name=name"`
GenerateName string `json:"generateName,omitempty" protobuf:"bytes,2,opt,name=generateName"`
Namespace string `json:"namespace,omitempty" protobuf:"bytes,3,opt,name=namespace"`
SelfLink string `json:"selfLink,omitempty" protobuf:"bytes,4,opt,name=selfLink"`
UID types.UID `json:"uid,omitempty" protobuf:"bytes,5,opt,name=uid,casttype=k8s.io/kubernetes/pkg/types.UID"`
ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,6,opt,name=resourceVersion"`
Generation int64 `json:"generation,omitempty" protobuf:"varint,7,opt,name=generation"`
CreationTimestamp Time `json:"creationTimestamp,omitempty" protobuf:"bytes,8,opt,name=creationTimestamp"`
DeletionTimestamp *Time `json:"deletionTimestamp,omitempty" protobuf:"bytes,9,opt,name=deletionTimestamp"`
DeletionGracePeriodSeconds *int64 `json:"deletionGracePeriodSeconds,omitempty" protobuf:"varint,10,opt,name=deletionGracePeriodSeconds"`
Labels map[string]string `json:"labels,omitempty" protobuf:"bytes,11,rep,name=labels"`
Annotations map[string]string `json:"annotations,omitempty" protobuf:"bytes,12,rep,name=annotations"`
OwnerReferences []OwnerReference `json:"ownerReferences,omitempty" patchStrategy:"merge" patchMergeKey:"uid" protobuf:"bytes,13,rep,name=ownerReferences"`
Finalizers []string `json:"finalizers,omitempty" patchStrategy:"merge" protobuf:"bytes,14,rep,name=finalizers"`
ManagedFields []ManagedFieldsEntry `json:"managedFields,omitempty" protobuf:"bytes,17,rep,name=managedFields"`
}
对应k8s的yml文件中如下部分
metadata:
……
和k8s用yml文件创建deployment一样，此处我们主要关心Name和Namespace
1.5 DeploymentSpec（spec）
属于包：“k8s.io/api/apps/v1”
type DeploymentSpec struct {
Replicas *int32 `json:"replicas,omitempty" protobuf:"varint,1,opt,name=replicas"`
Selector *v1.LabelSelector `json:"selector" protobuf:"bytes,2,opt,name=selector"`
Template v1.PodTemplateSpec `json:"template" protobuf:"bytes,3,opt,name=template"`
Strategy DeploymentStrategy `json:"strategy,omitempty" patchStrategy:"retainKeys" protobuf:"bytes,4,opt,name=strategy"`
MinReadySeconds int32 `json:"minReadySeconds,omitempty" protobuf:"varint,5,opt,name=minReadySeconds"`
RevisionHistoryLimit *int32 `json:"revisionHistoryLimit,omitempty" protobuf:"varint,6,opt,name=revisionHistoryLimit"`
Paused bool `json:"paused,omitempty" protobuf:"varint,7,opt,name=paused"`
ProgressDeadlineSeconds *int32 `json:"progressDeadlineSeconds,omitempty" protobuf:"varint,9,opt,name=progressDeadlineSeconds"`
}
对应k8s的yml文件中如下部分
spec:
……
和k8s用yml文件创建deployment一样，这一部分是我们主要要传入的信息。
1） Replicas（spec.replicas）
一个 int的指针，因此赋值的时候我们只好先定义int变量，在把指针赋给它
2）LabelSelector（spec.selector）
所属包：“k8s.io/apimachinery/pkg/apis/meta/v1”
type LabelSelector struct {
MatchLabels map[string]string `json:"matchLabels,omitempty" protobuf:"bytes,1,rep,name=matchLabels"`
MatchExpressions []LabelSelectorRequirement `json:"matchExpressions,omitempty" protobuf:"bytes,2,rep,name=matchExpressions"`
}
和k8s用yml文件创建deployment一样，我们主要用其中matchLabels打标签：
spec:
selector:
matchLabels:
app: nginx
代码种示例如下
Selector: &metaV1.LabelSelector{
MatchLabels: map[string]string{
"app": "nginx",
},
},
3）PodTemplateSpec（spec.template）
所在包：“k8s.io/api/core/v1”
type PodTemplateSpec struct {
v1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
Spec PodSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
}
对应k8s的yml文件中如下部分，顾名思义，这一部分定义的是pod的模板。
spec:
……
template:
……
4）ObjectMeta （spec.template.metadata）
所在包：“k8s.io/apimachinery/pkg/apis/meta/v1”
type ObjectMeta struct {
Name string `json:"name,omitempty" protobuf:"bytes,1,opt,name=name"`
GenerateName string `json:"generateName,omitempty" protobuf:"bytes,2,opt,name=generateName"`
Namespace string `json:"namespace,omitempty" protobuf:"bytes,3,opt,name=namespace"`
SelfLink string `json:"selfLink,omitempty" protobuf:"bytes,4,opt,name=selfLink"`
UID types.UID `json:"uid,omitempty" protobuf:"bytes,5,opt,name=uid,casttype=k8s.io/kubernetes/pkg/types.UID"`
ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,6,opt,name=resourceVersion"`
Generation int64 `json:"generation,omitempty" protobuf:"varint,7,opt,name=generation"`
CreationTimestamp Time `json:"creationTimestamp,omitempty" protobuf:"bytes,8,opt,name=creationTimestamp"`
DeletionTimestamp *Time `json:"deletionTimestamp,omitempty" protobuf:"bytes,9,opt,name=deletionTimestamp"`
DeletionGracePeriodSeconds *int64 `json:"deletionGracePeriodSeconds,omitempty" protobuf:"varint,10,opt,name=deletionGracePeriodSeconds"`
Labels map[string]string `json:"labels,omitempty" protobuf:"bytes,11,rep,name=labels"`
Annotations map[string]string `json:"annotations,omitempty" protobuf:"bytes,12,rep,name=annotations"`
OwnerReferences []OwnerReference `json:"ownerReferences,omitempty" patchStrategy:"merge" patchMergeKey:"uid" protobuf:"bytes,13,rep,name=ownerReferences"`
Finalizers []string `json:"finalizers,omitempty" patchStrategy:"merge" protobuf:"bytes,14,rep,name=finalizers"`
ManagedFields []ManagedFieldsEntry `json:"managedFields,omitempty" protobuf:"bytes,17,rep,name=managedFields"`
}
对应k8s的yml文件中如下部分
spec:
……
template:
metadata:
creationTimestamp: null
labels:
app: nginx
代码中示例如下
ObjectMeta: metaV1.ObjectMeta{
Labels: map[string]string{
"app": deploymentName,
},
}
5）Spec（spec.template.spec）
type PodSpec struct {
Volumes []Volume `json:"volumes,omitempty" patchStrategy:"merge,retainKeys" patchMergeKey:"name" protobuf:"bytes,1,rep,name=volumes"`
InitContainers []Container `json:"initContainers,omitempty" patchStrategy:"merge" patchMergeKey:"name" protobuf:"bytes,20,rep,name=initContainers"`
Containers []Container `json:"containers" patchStrategy:"merge" patchMergeKey:"name" protobuf:"bytes,2,rep,name=containers"`
EphemeralContainers []EphemeralContainer `json:"ephemeralContainers,omitempty" patchStrategy:"merge" patchMergeKey:"name" protobuf:"bytes,34,rep,name=ephemeralContainers"`
RestartPolicy RestartPolicy `json:"restartPolicy,omitempty" protobuf:"bytes,3,opt,name=restartPolicy,casttype=RestartPolicy"`
TerminationGracePeriodSeconds *int64 `json:"terminationGracePeriodSeconds,omitempty" protobuf:"varint,4,opt,name=terminationGracePeriodSeconds"`
ActiveDeadlineSeconds *int64 `json:"activeDeadlineSeconds,omitempty" protobuf:"varint,5,opt,name=activeDeadlineSeconds"`
DNSPolicy DNSPolicy `json:"dnsPolicy,omitempty" protobuf:"bytes,6,opt,name=dnsPolicy,casttype=DNSPolicy"`
NodeSelector map[string]string `json:"nodeSelector,omitempty" protobuf:"bytes,7,rep,name=nodeSelector"`
ServiceAccountName string `json:"serviceAccountName,omitempty" protobuf:"bytes,8,opt,name=serviceAccountName"`
DeprecatedServiceAccount string `json:"serviceAccount,omitempty" protobuf:"bytes,9,opt,name=serviceAccount"`
AutomountServiceAccountToken *bool `json:"automountServiceAccountToken,omitempty" protobuf:"varint,21,opt,name=automountServiceAccountToken"`
NodeName string `json:"nodeName,omitempty" protobuf:"bytes,10,opt,name=nodeName"`
HostNetwork bool `json:"hostNetwork,omitempty" protobuf:"varint,11,opt,name=hostNetwork"`
HostPID bool `json:"hostPID,omitempty" protobuf:"varint,12,opt,name=hostPID"`
HostIPC bool `json:"hostIPC,omitempty" protobuf:"varint,13,opt,name=hostIPC"`
ShareProcessNamespace *bool `json:"shareProcessNamespace,omitempty" protobuf:"varint,27,opt,name=shareProcessNamespace"`
SecurityContext *PodSecurityContext `json:"securityContext,omitempty" protobuf:"bytes,14,opt,name=securityContext"`
ImagePullSecrets []LocalObjectReference `json:"imagePullSecrets,omitempty" patchStrategy:"merge" patchMergeKey:"name" protobuf:"bytes,15,rep,name=imagePullSecrets"`
Hostname string `json:"hostname,omitempty" protobuf:"bytes,16,opt,name=hostname"`
Subdomain string `json:"subdomain,omitempty" protobuf:"bytes,17,opt,name=subdomain"`
Affinity *Affinity `json:"affinity,omitempty" protobuf:"bytes,18,opt,name=affinity"`
SchedulerName string `json:"schedulerName,omitempty" protobuf:"bytes,19,opt,name=schedulerName"`
Tolerations []Toleration `json:"tolerations,omitempty" protobuf:"bytes,22,opt,name=tolerations"`
HostAliases []HostAlias `json:"hostAliases,omitempty" patchStrategy:"merge" patchMergeKey:"ip" protobuf:"bytes,23,rep,name=hostAliases"`
PriorityClassName string `json:"priorityClassName,omitempty" protobuf:"bytes,24,opt,name=priorityClassName"`
Priority *int32 `json:"priority,omitempty" protobuf:"bytes,25,opt,name=priority"`
DNSConfig *PodDNSConfig `json:"dnsConfig,omitempty" protobuf:"bytes,26,opt,name=dnsConfig"`
ReadinessGates []PodReadinessGate `json:"readinessGates,omitempty" protobuf:"bytes,28,opt,name=readinessGates"`
RuntimeClassName *string `json:"runtimeClassName,omitempty" protobuf:"bytes,29,opt,name=runtimeClassName"`
EnableServiceLinks *bool `json:"enableServiceLinks,omitempty" protobuf:"varint,30,opt,name=enableServiceLinks"`
PreemptionPolicy *PreemptionPolicy `json:"preemptionPolicy,omitempty" protobuf:"bytes,31,opt,name=preemptionPolicy"`
Overhead ResourceList `json:"overhead,omitempty" protobuf:"bytes,32,opt,name=overhead"`
TopologySpreadConstraints []TopologySpreadConstraint `json:"topologySpreadConstraints,omitempty" patchStrategy:"merge" patchMergeKey:"topologyKey" protobuf:"bytes,33,opt,name=topologySpreadConstraints"`
SetHostnameAsFQDN *bool `json:"setHostnameAsFQDN,omitempty" protobuf:"varint,35,opt,name=setHostnameAsFQDN"`
OS *PodOS `json:"os,omitempty" protobuf:"bytes,36,opt,name=os"`
HostUsers *bool `json:"hostUsers,omitempty" protobuf:"bytes,37,opt,name=hostUsers"`
}
对应k8s的yml文件中如下部分，是deployment中pod模板的规格信息
spec:
……
template:
spec:
……
这一部分通常是我们主要填写的，因为内容较多，目前不展开介绍了，以后用到我们再详细说明。
现在我们写一个代码中的简单示例
Spec: coreV1.PodSpec{
Containers: []coreV1.Container{
{
Name: deploymentName,
Image: image,
Ports: []coreV1.ContainerPort{
{
ContainerPort: portNum,
},
},
},
},
}
1.6 DeploymentStatus
所在包：“k8s.io/api/apps/v1”
type DeploymentStatus struct {
ObservedGeneration int64 `json:"observedGeneration,omitempty" protobuf:"varint,1,opt,name=observedGeneration"`
Replicas int32 `json:"replicas,omitempty" protobuf:"varint,2,opt,name=replicas"`
UpdatedReplicas int32 `json:"updatedReplicas,omitempty" protobuf:"varint,3,opt,name=updatedReplicas"`
ReadyReplicas int32 `json:"readyReplicas,omitempty" protobuf:"varint,7,opt,name=readyReplicas"`
AvailableReplicas int32 `json:"availableReplicas,omitempty" protobuf:"varint,4,opt,name=availableReplicas"`
UnavailableReplicas int32 `json:"unavailableReplicas,omitempty" protobuf:"varint,5,opt,name=unavailableReplicas"`
Conditions []DeploymentCondition `json:"conditions,omitempty" patchStrategy:"merge" patchMergeKey:"type" protobuf:"bytes,6,rep,name=conditions"`
CollisionCount *int32 `json:"collisionCount,omitempty" protobuf:"varint,8,opt,name=collisionCount"`
}
deployment的状态，入门中不必过多关注
1.7 对照yml文件示例
附原生k8s集群上一个deployment 信息，大家可以对照理解一下以上结构体
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "4"
field.cattle.io/publicEndpoints: '[{"addresses":["10.10.117.53"],"port":30051,"protocol":"TCP","serviceName":"liubei:nginx","allNodes":true}]'
creationTimestamp: "2022-09-28T06:07:39Z"
generation: 6
name: nginx
namespace: liubei
resourceVersion: "19656054"
selfLink: /apis/apps/v1/namespaces/liubei/deployments/nginx
uid: dcbf8aac-1c23-4be5-943e-c9f2b3e7c767
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app: nginx
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: nginx
spec:
containers:
- image: harbocto.xxx.com.cn/public/nginx:1.19.2-alpine
imagePullPolicy: Always
name: nginx
ports:
- containerPort: 80
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status:
availableReplicas: 1
conditions:
- lastTransitionTime: "2022-09-28T06:07:44Z"
lastUpdateTime: "2022-09-28T06:07:44Z"
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
- lastTransitionTime: "2022-09-28T06:07:39Z"
lastUpdateTime: "2022-09-28T13:01:17Z"
message: ReplicaSet "nginx-b6588447f" has successfully progressed.
reason: NewReplicaSetAvailable
status: "True"
type: Progressing
observedGeneration: 6
readyReplicas: 1
replicas: 1
updatedReplicas: 1
2. Deployment list
语法
- 语法
func (DeploymentInterface) List(ctx context.Context, opts v1.ListOptions) (*v1.DeploymentList, error)
- 语法示例
deploymentList,err = clientSet.AppsV1().Deployments(namespaceName).List(context.TODO(), metaV1.ListOptions{})
完整示例
- 创建函数
package crowK8S
import (
"context"
appsV1 "k8s.io/api/apps/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func GetDeploymentList(clientSet *kubernetes.Clientset,namespaceName string)(deploymentList *appsV1.DeploymentList,err error) {
deploymentList,err = clientSet.AppsV1().Deployments(namespaceName).List(context.TODO(), metaV1.ListOptions{})
if err != nil{
return nil, err
}
return deploymentList, err
}
说明：如果
namespaceName为空字串，则查所有namespace
- 引用函数
package main
import (
"fmt"
"go-k8s/crowK8S"
)
func main() {
clientSet,err := crowK8S.ConnectK8s()
if err !=nil {
fmt.Println(err)
}
deploymentList,err := crowK8S.GetDeploymentList(clientSet,"kube-system")
if err != nil {
fmt.Println(err)
}
for _,deployment := range deploymentList.Items{
fmt.Printf("%+v\n",deployment.Name)
}
}
3. Get Deployment
语法
完整示例
- 定义函数
package crowK8S
import (
"context"
appsV1 "k8s.io/api/apps/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func GetDeployment(clientSet *kubernetes.Clientset,namespaceName string,deploymentName string)(deploymentInfo *appsV1.Deployment,err error) {
deploymentInfo,err = clientSet.AppsV1().Deployments(namespaceName).Get(context.TODO(), deploymentName,metaV1.GetOptions{})
if err != nil{
return nil, err
}
return deploymentInfo, err
}
- 引用
package main
import (
"fmt"
"go-k8s/crowK8S"
)
func main() {
clientSet,err := crowK8S.ConnectK8s()
if err !=nil {
fmt.Println(err)
}
deploymentInfo,err := crowK8S.GetDeployment(clientSet,"kube-system","coredns")
if err != nil {
fmt.Println(err)
}
fmt.Printf("%+v\n",deploymentInfo)
}
- 结果输出
说明：打印是一个json字串，以下是我格式化后的结果：
{
ObjectMeta: {
coredns kube - system / apis / apps / v1 / namespaces / kube - system / deployments / coredns e6bfc631 - fe3a - 4863 - b202 - a96188c4c3f4 5154836 1 2022 - 07 - 12 16: 41: 38 + 0800 CST < nil > < nil > map[k8s - app: kube - dns] map[deployment.kubernetes.io / revision: 1][][][{
kubeadm Update apps / v1 2022 - 07 - 12 16: 41: 38 + 0800 CST FieldsV1 {
"f:metadata": {
"f:labels": {
".": {},
"f:k8s-app": {}
}
},
"f:spec": {
"f:progressDeadlineSeconds": {},
"f:replicas": {},
"f:revisionHistoryLimit": {},
"f:selector": {},
"f:strategy": {
"f:rollingUpdate": {
".": {},
"f:maxSurge": {},
"f:maxUnavailable": {}
},
"f:type": {}
},
"f:template": {
"f:metadata": {
"f:labels": {
".": {},
"f:k8s-app": {}
}
},
"f:spec": {
"f:containers": {
"k:{\"name\":\"coredns\"}": {
".": {},
"f:args": {},
"f:image": {},
"f:imagePullPolicy": {},
"f:livenessProbe": {
".": {},
"f:failureThreshold": {},
"f:httpGet": {
".": {},
"f:path": {},
"f:port": {},
"f:scheme": {}
},
"f:initialDelaySeconds": {},
"f:periodSeconds": {},
"f:successThreshold": {},
"f:timeoutSeconds": {}
},
"f:name": {},
"f:ports": {
".": {},
"k:{\"containerPort\":53,\"protocol\":\"TCP\"}": {
".": {},
"f:containerPort": {},
"f:name": {},
"f:protocol": {}
},
"k:{\"containerPort\":53,\"protocol\":\"UDP\"}": {
".": {},
"f:containerPort": {},
"f:name": {},
"f:protocol": {}
},
"k:{\"containerPort\":9153,\"protocol\":\"TCP\"}": {
".": {},
"f:containerPort": {},
"f:name": {},
"f:protocol": {}
}
},
"f:readinessProbe": {
".": {},
"f:failureThreshold": {},
"f:httpGet": {
".": {},
"f:path": {},
"f:port": {},
"f:scheme": {}
},
"f:periodSeconds": {},
"f:successThreshold": {},
"f:timeoutSeconds": {}
},
"f:resources": {
".": {},
"f:limits": {
".": {},
"f:memory": {}
},
"f:requests": {
".": {},
"f:cpu": {},
"f:memory": {}
}
},
"f:securityContext": {
".": {},
"f:allowPrivilegeEscalation": {},
"f:capabilities": {
".": {},
"f:add": {},
"f:drop": {}
},
"f:readOnlyRootFilesystem": {}
},
"f:terminationMessagePath": {},
"f:terminationMessagePolicy": {},
"f:volumeMounts": {
".": {},
"k:{\"mountPath\":\"/etc/coredns\"}": {
".": {},
"f:mountPath": {},
"f:name": {},
"f:readOnly": {}
}
}
}
},
"f:dnsPolicy": {},
"f:nodeSelector": {
".": {},
"f:kubernetes.io/os": {}
},
"f:priorityClassName": {},
"f:restartPolicy": {},
"f:schedulerName": {},
"f:securityContext": {},
"f:serviceAccount": {},
"f:serviceAccountName": {},
"f:terminationGracePeriodSeconds": {},
"f:tolerations": {},
"f:volumes": {
".": {},
"k:{\"name\":\"config-volume\"}": {
".": {},
"f:configMap": {
".": {},
"f:defaultMode": {},
"f:items": {},
"f:name": {}
},
"f:name": {}
}
}
}
}
}
}
} {
kube - controller - manager Update apps / v1 2022 - 08 - 05 16: 36: 43 + 0800 CST FieldsV1 {
"f:metadata": {
"f:annotations": {
".": {},
"f:deployment.kubernetes.io/revision": {}
}
},
"f:status": {
"f:availableReplicas": {},
"f:conditions": {
".": {},
"k:{\"type\":\"Available\"}": {
".": {},
"f:lastTransitionTime": {},
"f:lastUpdateTime": {},
"f:message": {},
"f:reason": {},
"f:status": {},
"f:type": {}
},
"k:{\"type\":\"Progressing\"}": {
".": {},
"f:lastTransitionTime": {},
"f:lastUpdateTime": {},
"f:message": {},
"f:reason": {},
"f:status": {},
"f:type": {}
}
},
"f:observedGeneration": {},
"f:readyReplicas": {},
"f:replicas": {},
"f:updatedReplicas": {}
}
}
}]
},
Spec: DeploymentSpec {
Replicas: * 2,
Selector: & v1.LabelSelector {
MatchLabels: map[string] string {
k8s - app: kube - dns,
},
MatchExpressions: [] LabelSelectorRequirement {},
},
Template: {
{
0 0001 - 01 - 01 00: 00: 00 + 0000 UTC < nil > < nil > map[k8s - app: kube - dns] map[][][][]
} {
[{
config - volume {
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ConfigMapVolumeSource {
LocalObjectReference: LocalObjectReference {
Name: coredns,
},
Items: [] KeyToPath {
KeyToPath {
Key: Corefile,
Path: Corefile,
Mode: nil,
},
},
DefaultMode: * 420,
Optional: nil,
}
nil nil nil nil nil nil nil nil nil nil
}
}][][{
coredns registry.aliyuncs.com / google_containers / coredns: v1 .8 .0[][-conf / etc / coredns / Corefile][{
dns 0 53 UDP
} {
dns - tcp 0 53 TCP
} {
metrics 0 9153 TCP
}][][] {
map[memory: {
{
178257920 0
} { < nil >
}
170 Mi BinarySI
}] map[cpu: {
{
100 - 3
} { < nil >
}
100 m DecimalSI
}
memory: {
{
73400320 0
} { < nil >
}
70 Mi BinarySI
}]
}[{
config - volume true / etc / coredns < nil >
}][] & Probe {
ProbeHandler: ProbeHandler {
Exec: nil,
HTTPGet: & HTTPGetAction {
Path: /health,Port:{0 8080 },Host:,Scheme:HTTP,HTTPHeaders:[]HTTPHeader{},},TCPSocket:nil,GRPC:nil,},InitialDelaySeconds:60,TimeoutSeconds:5,PeriodSeconds:10,SuccessThreshold:1,FailureThreshold:5,TerminationGracePeriodSeconds:nil,} &Probe{ProbeHandler:ProbeHandler{Exec:nil,HTTPGet:&HTTPGetAction{Path:/ready,
Port: {
0 8181
},
Host: ,
Scheme: HTTP,
HTTPHeaders: [] HTTPHeader {},
},
TCPSocket: nil,
GRPC: nil,
},
InitialDelaySeconds: 0,
TimeoutSeconds: 1,
PeriodSeconds: 10,
SuccessThreshold: 1,
FailureThreshold: 3,
TerminationGracePeriodSeconds: nil,
}
nil nil / dev / termination - log File IfNotPresent & SecurityContext {
Capabilities: & Capabilities {
Add: [NET_BIND_SERVICE],
Drop: [all],
},
Privileged: nil,
SELinuxOptions: nil,
RunAsUser: nil,
RunAsNonRoot: nil,
ReadOnlyRootFilesystem: * true,
AllowPrivilegeEscalation: * false,
RunAsGroup: nil,
ProcMount: nil,
WindowsOptions: nil,
SeccompProfile: nil,
}
false false false
}][] Always 0xc000517f88 < nil > Default map[kubernetes.io / os: linux] coredns coredns < nil > false false false < nil > & PodSecurityContext {
SELinuxOptions: nil,
RunAsUser: nil,
RunAsNonRoot: nil,
SupplementalGroups: [],
FSGroup: nil,
RunAsGroup: nil,
Sysctls: [] Sysctl {},
WindowsOptions: nil,
FSGroupChangePolicy: nil,
SeccompProfile: nil,
}[] nil
default -scheduler[{
CriticalAddonsOnly Exists < nil >
} {
node - role.kubernetes.io / master NoSchedule < nil >
} {
node - role.kubernetes.io / control - plane NoSchedule < nil >
}][] system - cluster - critical < nil > nil[] < nil > < nil > < nil > map[][] < nil > nil < nil >
}
},
Strategy: DeploymentStrategy {
Type: RollingUpdate,
RollingUpdate: & RollingUpdateDeployment {
MaxUnavailable: 1,
MaxSurge: 25 % ,
},
},
MinReadySeconds: 0,
RevisionHistoryLimit: * 10,
Paused: false,
ProgressDeadlineSeconds: * 600,
},
Status: DeploymentStatus {
ObservedGeneration: 1,
Replicas: 2,
UpdatedReplicas: 2,
AvailableReplicas: 2,
UnavailableReplicas: 0,
Conditions: [] DeploymentCondition {
DeploymentCondition {
Type: Progressing,
Status: True,
Reason: NewReplicaSetAvailable,
Message: ReplicaSet "coredns-59d64cd4d4"
has successfully progressed.,
LastUpdateTime: 2022 - 07 - 12 16: 44: 35 + 0800 CST,
LastTransitionTime: 2022 - 07 - 12 16: 41: 49 + 0800 CST,
}, DeploymentCondition {
Type: Available,
Status: True,
Reason: MinimumReplicasAvailable,
Message: Deployment has minimum availability.,
LastUpdateTime: 2022 - 08 - 05 16: 36: 39 + 0800 CST,
LastTransitionTime: 2022 - 08 - 05 16: 36: 39 + 0800 CST,
},
},
ReadyReplicas: 2,
CollisionCount: nil,
},
}
4. Create Deployment
语法示例
deployment,err := clientset.AppsV1().Deployments(namespace).Create(context.TODO(),deployment,metaV1.CreateOptions{})
完整示例
- yml文件对照
以下是边这个yml文件为例，我们就照着这个内容写代码：
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: liubei
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: harbocto.xxx.com.cn/public/nginx
imagePullPolicy: Always
ports:
- containerPort: 80
- 定义函数
package crowK8S
import (
"context"
appsV1 "k8s.io/api/apps/v1"
coreV1 "k8s.io/api/core/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func CreateSimpleDeployment(clientSet *kubernetes.Clientset,namespaceName string,deploymentName string,image string,portNum int32,replicas int32)(deploymentInfo *appsV1.Deployment,err error) {
namespace := namespaceName
//这个结构和原生k8s启动deployment的yml文件结构完全一样，对着写就好
deployment := &appsV1.Deployment{
ObjectMeta: metaV1.ObjectMeta{
Name: deploymentName,
},
Spec: appsV1.DeploymentSpec{
Replicas: &replicas,
Selector: &metaV1.LabelSelector{
MatchLabels: map[string]string{
"app":deploymentName,
},
},
Template: coreV1.PodTemplateSpec{
ObjectMeta: metaV1.ObjectMeta{
Labels: map[string]string{
"app": deploymentName,
},
},
Spec: coreV1.PodSpec{
Containers: []coreV1.Container{
{
Name: deploymentName,
Image: image,
Ports: []coreV1.ContainerPort{
{
ContainerPort: portNum,
},
},
},
},
},
},
},
}
deploymentInfo,err = clientSet.AppsV1().Deployments(namespace).Create(context.TODO(),deployment,metaV1.CreateOptions{})
if err != nil {
return deploymentInfo,err
}
return deploymentInfo,nil
}
- 调用
package main
import (
"fmt"
"go-k8s/crowK8S"
)
func main() {
clientSet,err := crowK8S.ConnectK8s()
if err !=nil {
fmt.Println(err)
}
deploymentInfo,err := crowK8S.CreateSimpleDeployment(clientSet,"liubei","nginx","harbocto.xxx.com.cn/public/nginx",80,1)
if err != nil {
fmt.Println(err)
}
fmt.Printf("%+v\n",deploymentInfo)
}
- 输出
&Deployment{ObjectMeta:{nginx liubei /apis/apps/v1/namespaces/liubei/deployments/nginx dcbf8aac-1c23-4be5-943e-c9f2b3e7c767 19114656 1 2022-09-28 14:07:39 +0800 CST <nil> <nil> map[] map[] [] [] [{___6go_build_main_go.exe Update apps/v1 2022-09-28 14:07:39 +0800 CST FieldsV1 {"f:spec":{"f:progressDeadlineSeconds":{},"f:replicas":{},"f:revisionHistoryLimit":{},"f:selector":{},"f:strategy":{"f:rollingUpdate":{".":{},"f:maxSurge":{},"f:maxUnavailable":{}},"f:type":{}},"f:template":{"f:metadata":{"f:labels":{".":{},"f:app":{}}},"f:spec":{"f:containers":{"k:{\"name\":\"nginx\"}":{".":{},"f:image":{},"f:imagePullPolicy":{},"f:name":{},"f:ports":{".":{},"k:{\"containerPort\":80,\"protocol\":\"TCP\"}":{".":{},"f:containerPort":{},"f:protocol":{}}},"f:resources":{},"f:terminationMessagePath":{},"f:terminationMessagePolicy":{}}},"f:dnsPolicy":{},"f:restartPolicy":{},"f:schedulerName":{},"f:securityContext":{},"f:terminationGracePeriodSeconds":{}}}}} }]},Spec:DeploymentSpec{Replicas:*1,Selector:&v1.LabelSelector{MatchLabels:map[string]string{app: nginx,},MatchExpressions:[]LabelSelectorRequirement{},},Template:{{ 0 0001-01-01 00:00:00 +0000 UTC <nil> <nil> map[app:nginx] map[] [] [] []} {[] [] [{nginx harbocto.xxx.com.cn/public/nginx [] [] [{ 0 80 TCP }] [] [] {map[] map[]} [] [] nil nil nil nil /dev/termination-log File Always nil false false false}] [] Always 0xc000560040 <nil> ClusterFirst map[] <nil> false false false <nil> PodSecurityContext{SELinuxOptions:nil,RunAsUser:nil,RunAsNonRoot:nil,SupplementalGroups:[],FSGroup:nil,RunAsGroup:nil,Sysctls:[]Sysctl{},WindowsOptions:nil,FSGroupChangePolicy:nil,SeccompProfile:nil,} [] nil default-scheduler [] [] <nil> nil [] <nil> <nil> <nil> map[] [] <nil> nil <nil>}},Strategy:DeploymentStrategy{Type:RollingUpdate,RollingUpdate:&RollingUpdateDeployment{MaxUnavailable:25%,MaxSurge:25%,},},MinReadySeconds:0,RevisionHistoryLimit:*10,Paused:false,ProgressDeadlineSeconds:*600,},Status:DeploymentStatus{ObservedGeneration:0,Replicas:0,UpdatedReplicas:0,AvailableReplicas:0,UnavailableReplicas:0,Conditions:[]DeploymentCondition{},ReadyReplicas:0,CollisionCount:nil,},}
5. PUT Deployment
语法
- 语法
func (DeploymentInterface) Update(ctx context.Context, deployment *v1.Deployment, opts v1.UpdateOptions) (*v1.Deployment, error)
- 语法示例
deploymentInfo,err = clientSet.AppsV1().Deployments(namespaceName).Update(context.TODO(),deployment,metaV1.UpdateOptions{})
完整示例（修改镜像）
- 创建函数
package crowK8S
import (
"context"
"fmt"
appsV1 "k8s.io/api/apps/v1"
coreV1 "k8s.io/api/core/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func ApplyDeploymentByImage(clientSet *kubernetes.Clientset,namespaceName string,deploymentName string,image string)(deploymentInfo *appsV1.Deployment,err error) {
deployment,err := clientSet.AppsV1().Deployments(namespaceName).Get(context.TODO(),deploymentName,metaV1.GetOptions{})
if err !=nil {
return deploymentInfo,err
}
//deployment.Spec.Replicas = &replicas
deployment.Spec.Template.Spec.Containers[0].Image = image
deploymentInfo,err = clientSet.AppsV1().Deployments(namespaceName).Update(context.TODO(),deployment,metaV1.UpdateOptions{})
if err !=nil {
return deploymentInfo,err
}
return deploymentInfo,nil
}
- 引用
package main
import (
"fmt"
"go-k8s/crowK8S"
)
func main() {
clientSet,err := crowK8S.ConnectK8s()
if err !=nil {
fmt.Println(err)
}
deploymentInfo,err := crowK8S.ApplyDeploymentByImage(clientSet,"liubei","nginx","harbocto.xxx.com.cn/public/nginx:1.19.2-alpine")
if err != nil {
fmt.Println(err)
}
fmt.Printf("%+v\n",deploymentInfo)
}
- 输出
&Deployment{ObjectMeta:{nginx liubei /apis/apps/v1/namespaces/liubei/deployments/nginx dcbf8aac-1c23-4be5-943e-c9f2b3e7c767 19190799 4 2022-09-28 14:07:39 +0800 CST <nil> <nil> map[] map[deployment.kubernetes.io/revision:3] [] [] [{___6go_build_main_go.exe Update apps/v1 2022-09-28 14:07:39 +0800 CST FieldsV1 {"f:spec":{"f:progressDeadlineSeconds":{},"f:replicas":{},"f:revisionHistoryLimit":{},"f:selector":{},"f:strategy":{"f:rollingUpdate":{".":{},"f:maxSurge":{},"f:maxUnavailable":{}},"f:type":{}},"f:template":{"f:metadata":{"f:labels":{".":{},"f:app":{}}},"f:spec":{"f:containers":{"k:{\"name\":\"nginx\"}":{".":{},"f:image":{},"f:imagePullPolicy":{},"f:name":{},"f:ports":{".":{},"k:{\"containerPort\":80,\"protocol\":\"TCP\"}":{".":{},"f:containerPort":{},"f:protocol":{}}},"f:resources":{},"f:terminationMessagePath":{},"f:terminationMessagePolicy":{}}},"f:dnsPolicy":{},"f:restartPolicy":{},"f:schedulerName":{},"f:securityContext":{},"f:terminationGracePeriodSeconds":{}}}}} } {kube-controller-manager Update apps/v1 2022-09-28 21:00:18 +0800 CST FieldsV1 {"f:metadata":{"f:annotations":{".":{},"f:deployment.kubernetes.io/revision":{}}},"f:status":{"f:availableReplicas":{},"f:conditions":{".":{},"k:{\"type\":\"Available\"}":{".":{},"f:lastTransitionTime":{},"f:lastUpdateTime":{},"f:message":{},"f:reason":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Progressing\"}":{".":{},"f:lastTransitionTime":{},"f:lastUpdateTime":{},"f:message":{},"f:reason":{},"f:status":{},"f:type":{}}},"f:observedGeneration":{},"f:readyReplicas":{},"f:replicas":{},"f:updatedReplicas":{}}} }]},Spec:DeploymentSpec{Replicas:*1,Selector:&v1.LabelSelector{MatchLabels:map[string]string{app: nginx,},MatchExpressions:[]LabelSelectorRequirement{},},Template:{{ 0 0001-01-01 00:00:00 +0000 UTC <nil> <nil> map[app:nginx] map[] [] [] []} {[] [] [{nginx harbocto.boe.com.cn/public/nginx:1.19.2-alpine [] [] [{ 0 80 TCP }] [] [] {map[] map[]} [] [] nil nil nil nil /dev/termination-log File Always nil false false false}] [] Always 0xc00043a180 <nil> ClusterFirst map[] <nil> false false false <nil> PodSecurityContext{SELinuxOptions:nil,RunAsUser:nil,RunAsNonRoot:nil,SupplementalGroups:[],FSGroup:nil,RunAsGroup:nil,Sysctls:[]Sysctl{},WindowsOptions:nil,FSGroupChangePolicy:nil,SeccompProfile:nil,} [] nil default-scheduler [] [] <nil> nil [] <nil> <nil> <nil> map[] [] <nil> nil <nil>}},Strategy:DeploymentStrategy{Type:RollingUpdate,RollingUpdate:&RollingUpdateDeployment{MaxUnavailable:25%,MaxSurge:25%,},},MinReadySeconds:0,RevisionHistoryLimit:*10,Paused:false,ProgressDeadlineSeconds:*600,},Status:DeploymentStatus{ObservedGeneration:3,Replicas:1,UpdatedReplicas:1,AvailableReplicas:1,UnavailableReplicas:0,Conditions:[]DeploymentCondition{DeploymentCondition{Type:Available,Status:True,Reason:MinimumReplicasAvailable,Message:Deployment has minimum availability.,LastUpdateTime:2022-09-28 14:07:44 +0800 CST,LastTransitionTime:2022-09-28 14:07:44 +0800 CST,},DeploymentCondition{Type:Progressing,Status:True,Reason:NewReplicaSetAvailable,Message:ReplicaSet "nginx-86d45dbbf4" has successfully progressed.,LastUpdateTime:2022-09-28 21:00:18 +0800 CST,LastTransitionTime:2022-09-28 14:07:39 +0800 CST,},},ReadyReplicas:1,CollisionCount:nil,},}
完整示例（修改副本数）
- 创建函数
func ApplyDeploymentByReplicas(clientSet *kubernetes.Clientset,namespaceName string,deploymentName string,replicas int32)(deploymentInfo *appsV1.Deployment,err error) {
deployment,err := clientSet.AppsV1().Deployments(namespaceName).Get(context.TODO(),deploymentName,metaV1.GetOptions{})
if err !=nil {
return deploymentInfo,err
}
deployment.Spec.Replicas = &replicas
deploymentInfo,err = clientSet.AppsV1().Deployments(namespaceName).Update(context.TODO(),deployment,metaV1.UpdateOptions{})
if err !=nil {
return deploymentInfo,err
}
//fmt.Println(err,deployment)
return deploymentInfo,nil
}
6. Delete Deployment
语法
- 语法
func (DeploymentInterface) Delete(ctx context.Context, name string, opts v1.DeleteOptions) error
- 语法示例
err = clientSet.AppsV1().Deployments(namespaceName).Delete(context.TODO(),deploymentName,metaV1.DeleteOptions{})
完整示例
- 创建函数
package crowK8S
import (
"context"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func DeleteDeployment(clientSet *kubernetes.Clientset,namespaceName string,deploymentName string)(err error) {
err = clientSet.AppsV1().Deployments(namespaceName).Delete(context.TODO(),deploymentName,metaV1.DeleteOptions{})
if err != nil {
return err
}
return nil
}
- 调用
import (
"fmt"
"go-k8s/crowK8S"
)
func main() {
clientSet,err := crowK8S.ConnectK8s()
if err !=nil {
fmt.Println(err)
}
err = crowK8S.DeleteDeployment(clientSet,"liubei","nginx")
if err != nil {
fmt.Println(err)
}else {
fmt.Println("删除成功")
}
}
