Server reboot script with timed loop - powershell

Question

I'm putting together a reboot script used for scheduling server reboots.
My goal is to improve functionality and error handling by using a loop with counter to break/exit the script if the server:
1) Does not restart. For example While (Test-path "\\$server\c$")
2) Does not come online. For example While (-not(Test-path "\\$server\c$"))
In addition, I'm trying to add logging to a CSV file if any of the above conditions are TRUE. Otherwise the script continues and creates the CSV with the previous reboot time stamp along with current reboot time stamp.
My current attempt does not seem to correctly exit the script and log the failure and honestly I'm a little unsure of how to test this before rebooting servers.
Param([Parameter(Mandatory=$true)][string]$server)
$ErrorActionPreference = "SilentlyContinue"
Try{
$LastReboot = Get-EventLog -ComputerName $server -LogName system | Where-Object {$_.EventID -eq '6005'} | Select -ExpandProperty TimeGenerated | select -first 1
(Invoke-WmiMethod -ComputerName $server -Path "Win32_Service.Name='HealthService'" -Name PauseService).ReturnValue | Out-Null
Restart-Computer -ComputerName $server -Force
#New loop with counter, exit script if server did not reboot.
$max = 20;$i = 0
DO{
IF($i -gt $max){
$hash = #{
"Server" = $server
"Status" = "FailedToReboot!"
"LastRebootTime" = $LastReboot
}
$newRow = New-Object PsObject -Property $hash
Export-Csv c:\Scripts\RebootCheck.csv -InputObject $newrow -Append -Force
;exit}#exit script and log failed to reboot.
$i++
"Wait for server to reboot"
Start-Sleep -Seconds 30
}#end DO
While (Test-path "\\$server\c$")
$max = 15;$i = 0
DO{
IF($i -gt $max){
$hash = #{
"Server" = $server
"Status" = "FailedToComeOnline!"
"LastRebootTime" = $LastReboot
}
$newRow = New-Object PsObject -Property $hash
Export-Csv c:\Scripts\RebootCheck.csv -InputObject $newrow -Append -Force
;exit}#exit script and log failed to reboot.
$i++
"Wait for [$server] to come online"
Start-Sleep -Seconds 30
}#end DO
While (-not(Test-path "\\$server\c$"))
$CurrentReboot = Get-EventLog -ComputerName $server -LogName system | Where-Object {$_.EventID -eq '6005'} | Select -ExpandProperty TimeGenerated | select -first 1
$hash = #{
"Server" = $server
"Status" = "RebootSuccessful"
"LastRebootTime" = $LastReboot
"CurrentRebootTime" = $CurrentReboot
}
$newRow = New-Object PsObject -Property $hash
Export-Csv c:\Scripts\RebootCheck.csv -InputObject $newrow -Append -Force
}#End Try.
Catch{
$errMsg = $_.Exception
"Failed with $errMsg"
}

Answer 1

In order to break out of a loop, use the break keyword, not return.
Assign $true to $test inside the if block immediately before break:
$test = false
while ($limit -lt $max){
Write-Host "Reboot Request Sent, waiting for server to reboot"
if(Test-Path \\Server1\C$){
Write-Host "Reboot Successful, continue script"
$test = $true
break
}
$limit++
Start-Sleep -Seconds 10
}
The switch statement you've shown is syntactically valid, but kinda weird, since it's the exact equivalent of a standard if/else:
if($test)
{
Write-Host "Reboot succeeded!"
}
else
{
Write-Host "Reboot failed!"
}

Answer 2

After trial and error I believe I have something working.
This example will exit the script after two seconds
#restart-computer $server
$max = 2;$i = 0
DO{
IF($i -gt $max){"Server failed to reboot!";exit}#exit script and log failed to reboot.
$i++
"Wait for server to reboot"
Start-Sleep -Seconds 1
}#end DO
While (Test-path "\\$server\c$")
"Server rebooted, continue script"