背景
上一步完成了client-go gin的簡單整合一（list清單相關操作）,實作了簡單的namespace deployment service的name的輸出！現在我想輸出更多的内容，也當時深入一下kubernetes這些基礎！
1. client-go gin的簡單整合二（list清單相關進一步操作）
1. 從namespace開始
[root@zhangpeng ~]# kubectl get ns -o wide
首先我想輸出namespace的STATUS狀态和AGE！
以develop為例看一下還有什麼想輸出的資訊
[root@zhangpeng ~]# kubectl get ns develop -o yaml
creationTimestamp labels status狀态在這裡也是可以展現的！
動手吧
src/service/Namespace.go
package service
import (
"context"
"github.com/gin-gonic/gin"
. "k8s-demo1/src/lib"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"time"
)
type Time struct {
time.Time `protobuf:"-"`
}
type Namespace struct {
Name string
CreateTime Time `json:"CreateTime"`
Status string
Labels map[string]string
}
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: Time(item.CreationTimestamp),
Status: string(item.Status.Phase),
Labels: item.Labels,
})
}
g.JSON(200, ret)
return
}
注：畢竟新手不太會處理資料，就做了如下處理，先能展現出自己先要的資料。後面再作深入的學習！
同理status
但是我這裡偷懶了......直接搞了一個string。短期來看應該沒有什麼問題吧？
同理labels map[string]string
運作main.go,main.go依然是原來的沒有進行其他修改如下：
package main
import (
"github.com/gin-gonic/gin"
"k8s-demo1/src/service"
)
func main() {
r := gin.Default()
r.GET("/", func(context *gin.Context) {
context.JSON(200, "hello")
})
r.GET("/namespaces", service.ListNamespace)
r.GET("/deployments", service.ListDeployment)
r.GET("/service", service.ListService)
r.Run()
}
浏覽器通路：http://127.0.0.1:8080/namespaces
如下：
基本完成，AGE還沒有想好怎麼展現，是不是要算時間戳減去CreateTime?後面再去研究吧......
2.繼續deployment的進一步深入
[root@zhangpeng ~]# kubectl get deployment -o wide
恩 起碼的是要把這些基本輸出的：READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR！
詳細看一眼nginx deployment 看一眼還有什麼要輸出的：
[root@zhangpeng ~]# kubectl get deployment nginx -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "1"
creationTimestamp: "2022-05-01T13:47:52Z"
generation: 1
labels:
app: nginx
env: dev
name: nginx
namespace: default
resourceVersion: "16449910"
uid: ec1423a5-1268-40ea-bbf5-15576a332755
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app: nginx
env: dev
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: nginx
env: dev
name: nginx
spec:
containers:
- image: nginx:1.16.1
imagePullPolicy: IfNotPresent
name: nginx
ports:
- containerPort: 80
name: http
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status:
availableReplicas: 1
conditions:
- lastTransitionTime: "2022-05-01T13:48:10Z"
lastUpdateTime: "2022-05-01T13:48:10Z"
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
- lastTransitionTime: "2022-05-01T13:47:52Z"
lastUpdateTime: "2022-05-01T13:48:10Z"
message: ReplicaSet "nginx-7b5d9df6b8" has successfully progressed.
reason: NewReplicaSetAvailable
status: "True"
type: Progressing
observedGeneration: 1
readyReplicas: 1
replicas: 1
updatedReplicas: 1
這還沒有想好需要什麼，就先按照kubectl get deployment -o wide的輸出整一下了
src/service/Deployment.go
package service
import (
"context"
"github.com/gin-gonic/gin"
. "k8s-demo1/src/lib"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type Deployment struct {
Name string
Replicas int32
AvailableReplicas int32
UnavailableReplicas int32
Images string
Labels map[string]string
}
func ListDeployment(g *gin.Context) {
ns := g.Query("ns")
dps, err := K8sClient.AppsV1().Deployments(ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
g.Error(err)
}
ret := make([]*Deployment, 0)
for _, item := range dps.Items {
ret = append(ret, &Deployment{
Name: item.Name,
Replicas: item.Status.Replicas,
AvailableReplicas: item.Status.AvailableReplicas,
UnavailableReplicas: item.Status.UnavailableReplicas,
Images: item.Spec.Template.Spec.Containers[0].Image,
Labels: item.Labels,
})
}
g.JSON(200, ret)
return
}
Images也沒有考慮其他的，多個鏡像或者其他狀況，READY CONTAINERS還沒有想好怎麼展現！
go run main.go
http://127.0.0.1:8080/deployments
3.同理service
[root@zhangpeng .kube]# kubectl get svc -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes ClusterIP 192.168.0.1 <none> 443/TCP 55d <none>
package service
import (
"context"
"github.com/gin-gonic/gin"
. "k8s-demo1/src/lib"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type Service struct {
Name string
Type string
ClusterIp string
ExternalIp []string
Ports []string
Select map[string]string
}
func ListService(g *gin.Context) {
ns := g.Query("ns")
svc, err := K8sClient.CoreV1().Services(ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
g.Error(err)
return
}
ret := make([]*Service, 0)
for _, item := range svc.Items {
ret = append(ret, &Service{
Name: item.Name,
Type: string(item.Spec.Type),
ClusterIp: item.Spec.ClusterIP,
ExternalIp: item.Spec.ExternalIPs,
Select: item.Spec.Selector,
})
}
g.JSON(200, ret)
return
}
總結
- 算是基本上實作了list接口的自定義顯示？
- goland神器是不錯，檢視源碼，可惜還不能深入讀懂
- service ports ExternalIp,**deployment **READY CONTAINERS展現，還有image多鏡像的處理？
- AGE的計算