背景：
完成了client-go连接kubernetes集群-delete相关操作，稍微看过一些B站go圈里最会写js的奇淼 的go 与gin的视频，还有沈叔的一些课程：https://www.jtthink.com/。一般都是习惯先动手的，自己动手操作，有问题就看沈叔的视频与解决思路！
1. client-go gin的简单整合一
注：以下操作环境可能有些许区别（在家写东西用的windows，公司的办公环境个人安装了一台rocky linux）。一下所有路径为相对路径在k8s-demo1项目目录下！
1. go get 安装gin依赖
PS C:\Users\zhangpeng\GolandProjects\k8s-demo1> go get github.com/gin-gonic/gin
go get: added github.com/gin-contrib/sse v0.1.0
go get: added github.com/gin-gonic/gin v1.7.7
go get: added github.com/go-playground/locales v0.13.0
go get: added github.com/go-playground/universal-translator v0.17.0
go get: added github.com/go-playground/validator/v10 v10.4.1
go get: added github.com/leodido/go-urn v1.2.0
go get: added github.com/mattn/go-isatty v0.0.12
go get: added github.com/ugorji/go/codec v1.1.7
注：linux环境操作省略......如报错缺少其他依赖go get自行按照提示获取安装！
2. 将连接客户端单独封装成一个方法文件
将前面测试环境写的单独的文件拆分。把客户端单独封装成一个单独文件：
src/lib/K8sClient.go
package lib
import (
"flag"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"path/filepath"
)
var K8sClient *kubernetes.Clientset
func init() {
var kubeconfig *string
if home := homedir.HomeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
flag.Parse()
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
panic(err.Error())
}
// create the clientset
c, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
K8sClient = c
}3. 创建service目录创建namespace deployment service对应service文件
以namespace deployment service为例：
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"
)
func ListNamespace(g *gin.Context) {
ns, err := K8sClient.CoreV1().Namespaces().List(context.Background(), metav1.ListOptions{})
if err != nil {
g.Error(err)
return
}
g.JSON(200, ns)
}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"
)
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)
}
g.JSON(200, dps)
return
}src/service/Service.go
package service
import (
"context"
"github.com/gin-gonic/gin"
. "k8s-demo1/src/lib"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
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
}
g.JSON(200, svc)
}
注：正常的应该是lib.K8sClient引用，import设置为了 . "k8s-demo1/src/lib"！
4.编辑main.go 设置路由
main.go
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()
}
5. 运行main.go,浏览器访问是否正常返回
可以命令行控制台go run main.go 也可以goland直接run main.go
注：此集群非前面的ack集群，为本地内网一个测试集群！故namespace等相关信息输出并不与前面部分对应
1. namespace:
http://127.0.0.1:8080/namespaces
2. deployment
http://127.0.0.1:8080/deployments
http://127.0.0.1:8080/deployments?ns=default 指定命名空间
3. service
http://127.0.0.1:8080/service
http://127.0.0.1:8080/service?ns=default 指定命名空间
基本实现了个人的目的。但是输出的内容太多了，很多东西不需要，想要进一步优化输出自己先要的信息！
2. 更进一步的-定制化输出需要的内容
1.关于namespace
namespace我只想输出空间name! 创建一个struct,并make创建一个切片：
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"
)
type Namespace struct {
Name 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,
})
}
g.JSON(200, ret)
return
}
浏览器访问http://127.0.0.1:8080/namespaces，如下：
2. 关于deployment
参照namespace设置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
}
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,
})
}
g.JSON(200, ret)
return
}
运行main.go 访问http://127.0.0.1:8080/deployments http://127.0.0.1:8080/deployments?ns=default
3. 关于service
src/service/Service.go如下
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
}
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,
})
}
g.JSON(200, ret)
return
}运行main.go 访问http://127.0.0.1:8080/service http://127.0.0.1:8080/service?ns=default
反思：
1.切片的使用，指针的使用......
2.定制化输出更多的相关配置？比如deployments中镜像，副本数。namespace中label？创建时间？
3.gin.Context该让我怎么去理解......