Powershell 脚本在满足条件后不退出循环并在失败条件下被捕获

Question

我正在编写一个 powershell 脚本来停止和启动远程服务器上的服务。如果重新启动操作失败，我希望脚本发送电子邮件警报。

脚本的目标是停止服务，休眠几秒钟，然后检查服务。如果服务不是运行ning，请尝试启动服务并休眠，然后再检查。每次脚本无法启动服务时，它都会向重试计数 +1，如果重试计数超过最大重试次数，脚本将触发失败通知。如果服务是运行ning，它应该将重启操作标记为完成并退出循环。

我遇到的问题是，当我第一次运行脚本时，它进入循环，检查服务并错误地将其标记为完成。之后我去检查服务时，服务显示已停止。当我第二次运行脚本时，它停止服务，进入循环，尝试重新启动服务，循环 3 次，然后捕捉到旨在触发和电子邮件警报的失败条件。它一直在失败条件下循环，几十次，直到我强制退出。

我整晚都在为这个问题挠头，我想不出我哪里错了。我将 post 下面的脚本：

$VerbosePreference = "continue"
$remoteServer = 'My-RemoteServer01' 
$serviceName = 'MSSQLServerOLAPService'
$service = Get-Service -name $ServiceName
$maxRetries = 2
$retryCount = 0
$restartComplete = $false

stop-service -name $serviceName
write-verbose 'Service Stopped - Sleep 15s'
start-sleep -s 15

write-verbose "Attempt to restart service '$retryCount' "

while ($restartComplete -eq $false){
     if ($service.status -eq 'Running')
        {
         $restartComplete = $true
         write-verbose "restart complete"
         }
         else {
               if ($retryCount -ge $maxRetries)   
                  { 
                   write-verbose "Service Restart Failed - Begin Alert"

                   $smtpServer = ('smtp.mymailserver.com', 00)
                   $msg = new-object Net.Mail.MailMessage
                   $smtp = new-object Net.Mail.SmtpClient($smtpServer)
                   $dateString = get-date

                   $msg.From = 'no-reply@mymailserver.com'
                   $msg.To.Add('L3LYZA@mymailserver.com')
                   $msg.subject = 'URGENT ALERT - Service ' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
                   $msg.body = ([string]$dateString) + 'Service' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
                   $smtp.send($msg)

                   write-verbose "Alert Sent - Complete"
                   }
                  else {                 
                        if ($service.status -ne 'Running')   
                           { 
                            start-service -name $serviceName
                            write-verbose 'Service Restarting - Sleep 45s'
                            start-sleep -s 45
                            $retryCount++

                           }
                   }
           }
   }

编辑：解决方案最终改变了我检查服务状态的方式。我还在失败条件中添加了一个 throw。

$VerbosePreference = "continue"
$remoteServer = 'My-RemoteServer' 
$serviceName = 'MSSQLServerOLAPService'
$service = Get-Service -name $ServiceName
$maxRetries = 2
$retryCount = 0
$restartComplete = $false

stop-service -name $serviceName
write-verbose 'Service Stopped - Sleep 15s'
start-sleep -s 15

write-verbose "Attempt to restart service '$break' "

while ($restartComplete -eq $false){
     if ((Get-Service $serviceName).Status -eq 'Running')
        {
         $restartComplete = $true
         write-verbose "restart complete"
         }
         else {
               if ($retryCount -ge $maxRetries)   
                  { 
                   write-verbose "Service Restart Failed - Begin Alert"

                   $smtpServer = ('smtp.mymailserver.com', 00)
                   $msg = new-object Net.Mail.MailMessage
                   $smtp = new-object Net.Mail.SmtpClient($smtpServer)
                   $dateString = get-date

                   $msg.From = 'noreply@mymailserver.com'
                   $msg.To.Add('L3LYZA@mymailserver.com')
                   $msg.subject = 'URGENT ALERT - Service ' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
                   $msg.body = ([string]$dateString) + 'Service' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
                   $smtp.send($msg)

                   write-verbose "Alert Sent - Complete"
                   Throw "service restart failed exit condition met"
                   }
                  else {                 
                        if ((Get-Service $serviceName).Status -ne 'Running')   
                           { 
                            start-service -name $serviceName
                            write-verbose 'Service Restarting - Sleep 45s'
                            start-sleep -s 45
                            $retryCount++

                           }
                    }
            }
   }

Answer 1

不确定这是否是错误，但发现了一些似乎是错误的东西。

您在第 3 行检查服务状态，但在第 9 行停止服务。然后在第 16 行检查状态是否为运行ning。您需要再次运行 Get-Service 以获取服务的更新状态。

您可以通过以下方式完成此操作： (Get-Service $serviceName).Status

我的建议如下：

$VerbosePreference = "continue"
$remoteServer = 'My-RemoteServer01' 
$serviceName = 'MSSQLServerOLAPService'
$service = Get-Service -name $ServiceName
$maxRetries = 2
$retryCount = 0
$restartComplete = $false

stop-service -name $serviceName
write-verbose 'Service Stopped - Sleep 15s'
start-sleep -s 15

write-verbose "Attempt to restart service '$retryCount' "

start-service -name $serviceName

while ($restartComplete -eq $false) {
    if ((Get-Service $serviceName).Status -eq 'Running') {
        $restartComplete = $true
        write-verbose "restart complete"
    }
    else {
        if ($retryCount -ge $maxRetries) { 
            write-verbose "Service Restart Failed - Begin Alert"
            $smtpServer = "smtp.mymailserver.com"
            $dateString = get-date
            $mailFrom = 'no-reply@mymailserver.com'
            $mailTo('L3LYZA@mymailserver.com')
            $mailSubject = 'URGENT ALERT - Service ' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
            $mailBody = ([string]$dateString) + 'Service' + $service + 'is' + $service.status + 'on' + $remoteServer + '.'
            Send-MailMessage -SmtpServer $smtpserver -From $mailFrom -To $mailTo -Subject $mailSubject -Body $mailBody 
            write-verbose "Alert Sent - Complete"
        }
        else {                 
            if ($service.status -ne 'Running') { 
                start-service -name $serviceName
                write-verbose 'Service Restarting - Sleep 45s'
                start-sleep -s 45
                # Get an updated status from the service:
                $service = Get-Service -name $ServiceName
                $retryCount++
            }
        }
    }
}

请记住，我将邮件更改为本机 Powershell Send-MailMessage。您选择“Net.Mail.MailMessage”可能是有原因的，所以如果是，请将其改回。

Powershell 脚本在满足条件后不退出循环并在失败条件下被捕获

Powershell Script Not Exiting Loop after Conditions are Met and Getting Caught on Failure Condition

java

powershell

automation