"OALGen is running on the wrong CCR cluster node"

################################################################################
# 
# NAME  : ps_EnableOabGenOnThisNode.ps1
# AUTHOR: Seth Wright , James Madison University
# DATE  : 4/14/2009
# 
# DESCRIPTION:  This script sets the 'EnableOabGenOnThisNode' registry key on 
#               a CCR node member to the active node in the cluster.
#               Reference http://technet.microsoft.com/en-us/library/bb266910.aspx
#               for more information.
#
#
# Redistribution and use in source and binary forms, with or without           
# modification, are permitted provided that the following conditions are met:  
#
#  1. Redistributions of source code must retain the above copyright notice,   
#     this list of conditions and the following disclaimer.                    
#  2. Redistributions in binary form must reproduce the above copyright        
#     notice, this list of conditions and the following disclaimer in the      
#     documentation and/or other materials provided with the distribution.     
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY   
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED    
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE       
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY   
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES   
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND  
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF     
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.            
# 
################################################################################

$CurrentNode = Get-Content Env:ComputerName
$Log = $null

# Set up a new Event Source for the script, if it doesn't already exist.
if (![System.Diagnostics.EventLog]::sourceExists("EnableOabGen")) {
    $Log = [System.Diagnostics.EventLog]::CreateEventSource("EnableOabGen", "Application")
}

# Get the Application event log into the $Log variable.
$Log = New-Object System.Diagnostics.EventLog("Application", ".")
$Log.Source = "EnableOabGen"

$error.Clear()
$CMSName = Get-MailboxServer | where { $_.RedundantMachines -eq $CurrentNode }

if (!($CMSName) -or !([String]::IsNullOrEmpty($error[0]))) {
    # The CMSName couldn't be determined.  Either the script doesn't have
    # network access, or the computer is not part of a CCR cluster, or something
    # else is broke.  Log the error and bail.
    $Log.writeEntry("Could not determine the CMSName: $($error[0])", [System.Diagnostics.EventLogEntryType]::Error, 404)
    return
}

# Find the active node of the CMS.
# First, get a list of all nodes in the CMS.
$error.Clear()
$OperationalMachines = (Get-ClusteredMailboxServerStatus -Identity $CMSName).OperationalMachines

if (!($OperationalMachines) -or !([String]::IsNullOrEmpty($error[0]))) {
    # Couldn't determine the active node.  Something's not right, so don't try
    # to do anything else.  Log the error and bail.
    $Log.writeEntry("Could not determine OperationalMachines: $($error[0])", [System.Diagnostics.EventLogEntryType]::Error, 404)
    return
}

# $pattern is the regex pattern to use to look for node marked as 
# <Active...> in the OperationalMachines array.
$activePattern = "^(?<activenode>.*)\s+<Active.*"

# Perform the regex match.  $match is a throw-away variable.
$match = $OperationalMachines | where { $_ -match $activePattern }

if (!($matches.activenode)) {
    # No regex matches were found.
    $Log.writeEntry("Cannot determine the Active Node of CMS $CMSName", [System.Diagnostics.EventLogEntryType]::Error, 404)
    return
}

# A regex match was found for the Active Node.
$ActiveNode = $matches.activenode

# This is the base registry key
$baseKey = 'HKLM:\SYSTEM\CurrentControlSet\Services\MSExchangeSA\Parameters\' + $CMSName.Name
# Get the registry value "EnableOabGenOnThisNode" and check it against what it should be.
$result = (Get-ItemProperty -Path $baseKey).EnableOabGenOnThisNode
if ($result -notlike $ActiveNode) {
    # The value is wrong, so set it to the currently-active node.
    Set-ItemProperty -Path $baseKey -Name "EnableOabGenOnThisNode" -Value "$ActiveNode"
    
    $result = $null
    # Get the new value.  There could probably be a check that the key was
    # properly set, but I'm just trying to set it once.
    $result = (Get-ItemProperty -Path $baseKey).EnableOabGenOnThisNode
    
    # Log the change.
    $Log.writeEntry("The registry value `"EnableOabGenOnThisNode`" on $CurrentNode has been set to $result", [System.Diagnostics.EventLogEntryType]::Warning, 200)
}

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
<RegistrationInfo>
    <Date>2009-04-14T17:52:21.2602543</Date>
    <Description>
        This script sets the 'EnableOabGenOnThisNode' registry key
        on a CCR node member to the active node in the cluster.
        Reference
        http://technet.microsoft.com/en-us/library/bb266910.aspx for
        more information.
    </Description>
</RegistrationInfo>
<Triggers>
    <EventTrigger>
    <Enabled>true</Enabled>
    <Subscription><QueryList><Query Id="0" Path="Application"><Select Path="Application">*[System[Provider[@Name='MSExchange Cluster'] and EventID=1028]]</Select></Query></QueryList></Subscription>
    <Delay>PT15M</Delay>
    </EventTrigger>
    <EventTrigger>
    <Enabled>true</Enabled>
    <Subscription><QueryList><Query Id="0" Path="Application"><Select Path="Application">*[System[Provider[@Name='MSExchange Cluster'] and EventID=1029]]</Select></Query></QueryList></Subscription>
    <Delay>PT15M</Delay>
    </EventTrigger>
</Triggers>
<Principals>
    <Principal id="Author">
    <LogonType>Password</LogonType>
    <RunLevel>LeastPrivilege</RunLevel>
    </Principal>
</Principals>
<Settings>
    <IdleSettings>
    <Duration>PT10M</Duration>
    <WaitTimeout>PT1H</WaitTimeout>
    <StopOnIdleEnd>true</StopOnIdleEnd>
    <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <MultipleInstancesPolicy>Queue</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
    <AllowHardTerminate>true</AllowHardTerminate>
    <StartWhenAvailable>true</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <WakeToRun>false</WakeToRun>
    <ExecutionTimeLimit>P3D</ExecutionTimeLimit>
    <Priority>7</Priority>
</Settings>
<Actions Context="Author">
    <Exec>
    <Command>C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe</Command>
    <Arguments>-PSConsoleFile "D:\Program Files\Microsoft\Exchange Server\bin\exshell.psc1" D:\Scripts\Enable-OabGenOnThisNode.ps1</Arguments>
    </Exec>
</Actions>
</Task>