Golang使用Helm Chart管理应用全攻略

import (
    "context"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/tools/clientcmd"
    "helm.sh/helm/v3/pkg/action"
    "helm.sh/helm/v3/pkg/chart/loader"
    "helm.sh/helm/v3/pkg/cli"
)

// 初始化Kubernetes客户端
config, err := clientcmd.BuildConfigFromFlags("", "/path/to/kubeconfig")
if err != nil {
    panic(err)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
    panic(err)
}

// 设置Helm环境
settings := cli.New()
actionConfig := new(action.Configuration)
err = actionConfig.Init(
    settings.RESTClientGetter(),
    "default",           // 命名空间
    "memory",            // 存储后端（可用于测试）
    func(format string, v ...interface{}) {
        fmt.Sprintf(format, v...) // 日志输出
    },
)
if err != nil {
    panic(err)
}

install := action.NewInstall(actionConfig)
install.Namespace = "default"
install.ReleaseName = "my-release"
install.Wait = true

// 加载本地Chart包
chartPath, err := install.ChartPathOptions.LocateChart("./my-chart", settings)
if err != nil {
    panic(err)
}

chart, err := loader.Load(chartPath)
if err != nil {
    panic(err)
}

// 执行安装
rel, err := install.Run(chart, map[string]interface{}{})
if err != nil {
    panic(err)
}
fmt.Printf("Release installed: %s\n", rel.Name)

upgrade := action.NewUpgrade(actionConfig)
upgrade.Namespace = "default"
upgrade.Wait = true

updatedChart, err := loader.Load("./updated-chart")
if err != nil {
    panic(err)
}

rel, err := upgrade.Run("my-release", updatedChart, map[string]interface{}{
    "replicaCount": 3,
})
if err != nil {
    panic(err)
}
fmt.Printf("Release upgraded: %s\n", rel.Name)

uninstall := action.NewUninstall(actionConfig)
_, err = uninstall.Run("my-release")
if err != nil {
    panic(err)
}
fmt.Println("Release uninstalled")

get := action.NewGet(actionConfig)
rel, err := get.Run("my-release")
if err != nil {
    panic(err)
}
fmt.Printf("Status: %s\n", rel.Info.Status)
fmt.Printf("Last deployed: %v\n", rel.Info.LastDeployed)