當PowerShell腳本失敗時，我的選擇是什麼？

Question

不想使用隨APC一起提供的APC軟件我已經編寫了一個PowerShell腳本來監視我的UPS並在電池電量達到30％時啓動我的服務器的關閉順序。

腳本通過USB重定向在虛擬化服務器上​​運行。該窗口始終處於打開狀態，因爲它監視主UPS的電池電量的WMI輸入。該腳本工作很漂亮，但幾次我登錄到服務器，發現屏幕上出現以下錯誤

Get-WmiObject : Call was canceled by the message filter. (Exception from HRESULT: 0x80010002 (RPC_E_CALL_CANCELED)) 
At C:\Users\user\Desktop\upsmonitor.ps1:38 char:27 
+  $binfo = Get-WMIObject <<<< -class Win32_Battery -computername $system -namespace root\cimv2 
    + CategoryInfo   : InvalidOperation: (:) [Get-WmiObject], COMException 
    + FullyQualifiedErrorId : GetWMICOMException,Microsoft.PowerShell.Commands.GetWmiObjectCommand 

我認爲這是通過WMI活動造成的曇花一現 - 我讀過論壇認爲這是由WMI崩潰造成的。無論如何，這是有問題的，因爲如果腳本需要運行，並且出錯了，那麼它對我沒有好處。檢查服務器經常是不理想的，所以我想辦法要麼

• 失敗後
• 重新執行腳本在最低限度時通知我的腳本失敗

我已經讀入-ErrorAction交換機，但我不確定如何在我的情況下實施它，或者如果它甚至適用。通常情況下，我只是玩弄腳本，直到我能夠解決問題，但它只是真的出現在我的生產環境中，並且不一致。解決此問題可能需要幾個月，等待發生錯誤，希望我的修復工作。

我希望你們能提供任何幫助。

腳本如下所示。

## Variable Declaration 
cls 
$system = "." 
$namespace = "root\CIMV2" 

#SMTP Variables (for e-mail notifications) 
$emailFrom = "ups@domain.com" 
$emailto = "me@domain.com" 
$subject = "UPS Notifications" 
$PSEmailServer = "10.0.0.100" 

#Check to see if the event log source exists, and create it if it doesn't 
$sourceExists = get-eventlog -list | where-object {$_.logdisplayname -eq "UPS Monitor"} 
if (! $sourceExists) { 
    new-eventlog -LogName "UPS Monitor" -source "UPS Monitor" 
    } 

#Send the administrator a message to inform them of monitoring 
$initialStatus = Get-WMIObject -class Win32_Battery -computer $system -namespace $namespace 
send-mailmessage -From $emailFrom -To $emailTo -Subject $subject -Body "UPS Monitor Online: Monitoring UPS Status." 
echo "UPS Monitor Online - Currently Monitoring UPS Status. DO NOT CLOSE THIS WINDOW!" 

$eruntime = $initialstatus.estimatedruntime 

#What's the status of the Battery upon starting the script 
if ($initialStatus.batterystatus -eq 2) { 
    echo "Battery Status : On AC Power" 
    echo "Estimated Time remaining on charge : $eruntime minutes" 
} elseif($initialStatus.batterystatus -eq 1) { 
    echo "Battery Status : Discharging" 
    echo "Estimated Time remaining on charge : $eruntime minutes" 
    } 

write-eventlog -logname "UPS Monitor" -Source "UPS Monitor" -EntryType Information -EventID 1 -Message "UPS Monitor Online: Currently Monitoring UPS Status" 

while($true) 
    { 
    $binfo = Get-WMIObject -class Win32_Battery -computername $system -namespace root\cimv2 
    if($binfo.BatteryStatus -eq 2) { 
     #On AC Power - No action required 
     } 
     if($binfo.BatteryStatus -eq 1){ 
      #If UPS status is 1, UPS is discharging - Notifications will begin at 80% Battery Level 
      #echo "Battery Charge Percentage : " $binfo.EstimatedChargeRemaining 
      if($binfo.EstimatedChargeRemaining -eq 80){ 
       #When the battery level gets to 80% write an event to the event log and e-mail the administrator 
       write-eventlog -logname "UPS Monitor" -Source "UPS Monitor" -EntryType Information -EventID 1 -Message "Power Failure Detected - 80% Battery Life Remaining" 
       send-mailmessage -From $emailFrom -To $emailTo -Subject $subject -Body "Power Failure Detected; Servers on Battery Power. Battery level is 80%" 
       start-sleep -seconds 30 
       } 
      elseif($binfo.EstimatedChargeRemaining -eq 60){ 
       #When the battery level gets to 60% write an event to the event log and e-mail the administrator 
       write-eventlog -logname "UPS Monitor" -Source "UPS Monitor" -EntryType Information -EventID 1 -Message "Power Failure Detected : 60% Battery Life Remaining" 
       send-mailmessage -From $emailFrom -To $emailTo -Subject $subject -Body "Power Failure Detected; Servers on Battery Power. Battery level is 60%" 
       start-sleep -seconds 30 
       } 
      elseif($binfo.EstimatedChargeRemaining -eq 40){ 
       #When the battery level gets to 40% write an event to the event log and e-mail the administrator and warn of shutdown 
       write-eventlog -logname "UPS Monitor" -Source "UPS Monitor" -EntryType Information -EventID 1 -Message "Power Failure Detected : 40% Battery Life Remaining" 
       send-mailmessage -From $emailFrom -To $emailTo -Subject $subject -Body "Power Failure Detected & Reserve battery is critical. Servers will be restarted at 30% battery life if AC power is not resumed" 
       start-sleep -seconds 30 
       } 
       elseif($binfo.EstimatedChargeRemaining -le 30){ 
       #When the battery level gets to 30% being shutting down servers 
       write-eventlog -logname "UPS Monitor" -Source "UPS Monitor" -EntryType Information -EventID 1 -Message "Critical Battery Threshold Reached : Commencing Shutdown of servers" 
       send-mailmessage -From $emailFrom -To $emailTo -Subject $subject -Body "Power Failure Detected & Critical Battery Threshold has been Reached. Commencing Shutdown of Servers" 
       start-sleep -seconds 15 
       stop-computer -cn (Get-Content C:\Users\User\Desktop\serverlist.txt) -Force 
       } 

     } 
    } 

Answer 1

您可以簡單地使用try catch塊並在發生錯誤時在catch塊中定義特定的細節。