func runRemoteCommand(member service.ClusterMember, userName string, log *logging.Logger, command, stdin string, quiet bool) (string, error) {
hostAddress := member.ClusterIP
cmd := exec.Command("ssh", "-o", "UserKnownHostsFile=/dev/null", "-o", "StrictHostKeyChecking=no", userName+"@"+hostAddress, command)
var stdOut, stdErr bytes.Buffer
cmd.Stdout = &stdOut
cmd.Stderr = &stdErr
if stdin != "" {
cmd.Stdin = strings.NewReader(stdin)
}
if err := cmd.Run(); err != nil {
if !quiet {
log.Errorf("SSH failed: %s %s", cmd.Path, strings.Join(cmd.Args, " "))
}
return "", errgo.NoteMask(err, stdErr.String())
}
out := stdOut.String()
out = strings.TrimSuffix(out, "\n")
return out, nil
}