/
exec.go
71 lines (66 loc) · 1.84 KB
/
exec.go
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package util
import (
"bytes"
"os/exec"
"strconv"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
remotecommandclient "k8s.io/client-go/tools/remotecommand"
"k8s.io/klog/v2"
)
// ExecCmd executes a command inside a pod.
func ExecCmd(config *rest.Config, client kubernetes.Interface, podName, namespace, command string) (stdOut, stdErr string, retErr error) {
cmd := []string{
"sh",
"-c",
command,
}
req := client.CoreV1().RESTClient().Post().
Resource("pods").
Name(podName).
Namespace(namespace).
SubResource("exec")
req.VersionedParams(&v1.PodExecOptions{
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
Command: cmd,
}, scheme.ParameterCodec)
var stdout, stderr bytes.Buffer
executor, err := remotecommandclient.NewSPDYExecutor(config, "POST", req.URL())
if err != nil {
return "", "", err
}
err = executor.Stream(remotecommandclient.StreamOptions{
Stdin: nil,
Stdout: &stdout,
Stderr: &stderr,
})
if err != nil {
return "", "", err
}
return stdout.String(), stderr.String(), err
}
// TriggerCheckNodeConnectivity checks nodePort service connectivity, executing a command for every node in the target cluster.
func TriggerCheckNodeConnectivity(localNodes *v1.NodeList, command string, nodePortValue int) error {
for index := range localNodes.Items {
cmd := command + localNodes.Items[index].Status.Addresses[0].Address + ":" + strconv.Itoa(nodePortValue)
c := exec.Command("sh", "-c", cmd) //nolint:gosec // Just a test, no need for this check
output := &bytes.Buffer{}
errput := &bytes.Buffer{}
c.Stdout = output
c.Stderr = errput
klog.Infof("running command %s", cmd)
err := c.Run()
if err != nil {
klog.Error(err)
klog.Info(output.String())
klog.Info(errput.String())
return err
}
}
return nil
}