Error while running specific command in pod
php小编鱼仔在使用pod运行特定命令时遇到了错误。这个问题对于开发人员来说是非常常见的,但解决起来可能会有些困难。当我们在pod中执行特定命令时出现错误,这可能是由于多种因素引起的,比如版本不兼容、依赖关系问题等。在解决这个问题之前,我们需要先确定具体的错误信息,然后逐步排查和解决。在本文中,我们将介绍一些常见的错误情况和相应的解决方案,希望能帮助到遇到类似问题的开发人员。
问题内容
我正在尝试在正在运行的 pod 中执行命令。我正在使用 go k8sclient 来实现此目的,但遇到了问题。我也不知道解决方案是否正确。任何人都可以检查并提供正确的解决方案吗?
这是我的代码。
namespace := getnamespace() podname := "maxscale-0" config, err := rest.inclusterconfig() if err != nil { log.fatal(err) } clientset, err := kubernetes.newforconfig(config) if err != nil { log.fatal(err) } req := clientset.corev1().pods(namespace).exec(podname, &corev1.podexecoptions{ command: []string{"sh", "-c", "grep -op '\"name\": \"\\k[^\"]*' /var/lib/maxscale/mariadb-monitor_journal.json"}, }) // set up a stream to capture the output execstream, err := req.stream() if err != nil { fmt.println(err) os.exit(1) } // print the output buf := new(bytes.buffer) buf.readfrom(execstream) fmt.println(buf.string())
我得到的错误是
clientset.CoreV1().Pods(namespace).Exec undefined (type "k8s.io/client-go/kubernetes/typed/core/v1".PodInterface has no field or method Exec)
解决方法
正如 @david maze 所分享的,要使用 k8 的 go 客户端在 pod 中执行命令,请遵循以下代码:
import ( "io" v1 "k8s.io/api/core/v1" "k8s.io/client-go/kubernetes" "k8s.io/client-go/kubernetes/scheme" restclient "k8s.io/client-go/rest" "k8s.io/client-go/tools/remotecommand" ) // ExecCmd exec command on specific pod and wait the command's output. func ExecCmdExample(client kubernetes.Interface, config *restclient.Config, podName string, command string, stdin io.Reader, stdout io.Writer, stderr io.Writer) error { cmd := []string{ "sh", "-c", command, } req := client.CoreV1().RESTClient().Post().Resource("pods").Name(podName). Namespace("default").SubResource("exec") option := &v1.PodExecOptions{ Command: cmd, Stdin: true, Stdout: true, Stderr: true, TTY: true, } if stdin == nil { option.Stdin = false } req.VersionedParams( option, scheme.ParameterCodec, ) exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL()) if err != nil { return err } err = exec.Stream(remotecommand.StreamOptions{ Stdin: stdin, Stdout: stdout, Stderr: stderr, }) if err != nil { return err } return nil }
另请参阅此链接了解更多信息
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