Question

$inventory = Import-Csv "E:\MonitoringScripts\HealthCheck\PatStat_Pshell\inventory.csv"
foreach ($line in $inventory) {
    $server_name = $($line.servername)
    $port_number = $($line.port)
    $resolved_true = [System.Net.Dns]::GetHostAddresses("$server_name") 
    #Write-Host $resolved_true
    if ($resolved_true) {
        #Write-Host $server_name
        Write-Host 'the host is resolving'
    } else {
        Write-Host 'Not found in DNS'
    }
}

在上面的代码中，当清单文件中有主机无法解析dns时，如何避免以下内容出现在命令promt中？

Exception calling "GetHostAddresses" with "1" argument(s): "No such host is
known"
At E:\MonitoringScripts\HealthCheck\PatStat_Pshell\patrol.ps1:9 char:2
+     $resolved_true = [System.Net.Dns]::GetHostAddresses("$server_name")
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SocketException

Not found in DNS
the host is resolving

我只想看看：

Not found in DNS

或

the host is resolving

Answer 1

测试连接以查看主机是否首先存在。当然，现有的主机与在DNS中找到它并不完全相同。

$inventory = import-csv “E:\MonitoringScripts\HealthCheck\PatStat_Pshell\inventory.csv”
ForEach ($line in $inventory)
{
    $server_name = $($line.servername)
    $port_number = $($line.port)
    $resolved_true = $null
    if (Test-Connection -ComputerName $server_name -ErrorAction SilentlyContinue) {
        $resolved_true = [System.Net.Dns]::GetHostAddresses("$server_name")
    }
    #Write-host $resolved_true
    if($resolved_true) {
        #write-host $server_name
        Write-Host 'the host is resolving'
    } else {
        Write-Host 'Not found in DNS'
    }
}

Answer 2

捕获异常：

try {
    [Net.Dns]::GetHostAddresses($server_name)
    Write-Host 'the host is resolving'
} catch {
    Write-Host 'Not found in DNS'
}

Answer 3

阅读About Try Catch Finally：

使用Try，Catch和Final块来响应或处理终止脚本中的错误。

您可以按以下方式应用它：

try {
    $resolved_true = [System.Net.Dns]::GetHostAddresses($server_name)
} catch {
    $resolved_true = $null
}

Answer 4

$inventory = import-csv “E:\MonitoringScripts\HealthCheck\PatStat_Pshell\inventory.csv”
ForEach ($line in $inventory)
{
    $server_name = $($line.servername)
    $port_number = $($line.port)
    $resolved_true = $null
    try {
    $resolved_true = [System.Net.Dns]::GetHostAddresses($server_name) 
    } catch {
    $resolved_true = $null
    }
    #Write-host $resolved_true
    if($resolved_true) {
        #write-host $server_name
        Write-Host 'the host is resolving'
    } else {
        Write-Host 'Not found in DNS'
    }
}

这对我有用，非常感谢您的帮助。我必须标记@JosefZ答案，但真的谢谢大家。

如何避免不必要的输出[System.Net.Dns] :: GetHostAddresses（“ $ server_name”）

4 个答案: