Active Directory replication is a critical process that ensures the consistent and up-to-date state of directory information across all domain controllers in a domain. Monitoring this process is important as it helps identify any issues that may arise and resolve them quickly. One way to monitor Active Directory replication is by using the Repadmin command-line tool. Repadmin provides a wealth of information about the replication status and health of a domain. However, manually checking the Repadmin output can be time-consuming and tedious, and running it manually every 30 minutes just to check if everything is great doesn't seem like a great idea. While PowerShell has its own commands around replication I've not found something as fast and reliable as repadmin /replsummary.
Replication Summary to an email
So, as part of my advanced Active Directory module called ADEssentials, I wrote a function that uses repadmin to generate results. Then, I use PSWriteHTML to process them and Mailozaurr to send them to my email. Here's a how I did it:
$ReplicationSummary = Get-WinADForestReplicationSummary -IncludeStatisticsVariable Statistics
$Body = EmailBody {
EmailImage -Source 'https://evotec.xyz/wp-content/uploads/2021/04/Logo-evotec-bb.png' -UrlLink '' -AlternativeText 'Logo' -Width 181 -Heigh 57 -Inline
EmailText -Text "Dear ", "AD Team," -LineBreak
EmailText -Text "Upon reviewing the resuls of replication I've found: "
EmailList {
EmailListItem -Text "Servers with good replication: ", $($Statistics.Good) -Color Black, SpringGreen -FontWeight normal, bold
EmailListItem -Text "Servers with replication failures: ", $($Statistics.Failures) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Servers with replication delta over 24 hours: ", $($Statistics.DeltaOver24Hours) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Servers with replication delta over 12 hours: ", $($Statistics.DeltaOver12Hours) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Servers with replication delta over 6 hours: ", $($Statistics.DeltaOver6Hours) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Servers with replication delta over 3 hours: ", $($Statistics.DeltaOver3Hours) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Servers with replication delta over 1 hour: ", $($Statistics.DeltaOver1Hours) -Color Black, Red -FontWeight normal, bold
EmailListItem -Text "Unique replication errors: ", $($Statistics.UniqueErrors.Count) -Color Black, Red -FontWeight normal, bold
}
if ($Statistics.UniqueErrors.Count -gt 0) {
EmailText -Text "Unique replication errors:"
EmailList {
foreach ($ErrorText in $Statistics.UniqueErrors) {
EmailListItem -Text $ErrorText
}
}
} else {
EmailText -Text "It seems you're doing a great job! Keep it up! ![😊]()
" -LineBreak
}
EmailText -Text "For more details please check the table below:"
EmailTable -DataTable $ReplicationSummary {
EmailTableCondition -Inline -Name "Fail" -HighlightHeaders 'Fails', 'Total', 'PercentageError' -ComparisonType number -Operator gt 0 -BackgroundColor Salmon -FailBackgroundColor SpringGreen
} -HideFooter
EmailText -LineBreak
EmailText -Text "Kind regards,"
EmailText -Text "Your automation friend"
}
$EmailSplat = @{
From = 'przemyslaw.klys@evotec.pl'
To = 'przemyslaw.klys@evotec.pl'
Body = $Body
Priority = if ($Statistics.Failures -gt 0) { 'High' } else { 'Low' }
Subject = 'Replication Results ![💖]()
'
Verbose = $true
WhatIf = $false
MgGraph = $true
}
Connect-MgGraph
Send-EmailMessage @EmailSplat
'
Verbose = $true
WhatIf = $false
MgGraph = $true
}
Connect-MgGraph
Send-EmailMessage @EmailSplatWhat is the result of those 50 lines of code?
The Get-WinADForestReplicationSummary function joins over 100 functions available for Active Directory admins in the ADEssentials module. It's doing the heavy lifting of reading repadmin data and converting it to PowerShell objects. Then, we use the PSWriteHTML EmailBody function, which allows for the accessible building of emails without knowing HTML and CSS. Finally, since I wanted to send an email with Microsoft Graph, I've used Mailozaurr's amazing Send-EmailMessage to send an email.
What if you don't like emails? How about Microsoft Teams?
New-AdaptiveCard -Uri $TeamsUri {
New-AdaptiveColumnSet {
New-AdaptiveColumn -Width auto {
New-AdaptiveImage -Url "https://evotec.xyz/wp-content/uploads/2021/04/Logo-evotec-bb.png" -Size Large -Style default
}
New-AdaptiveColumn -Width stretch {
New-AdaptiveTextBlock -Text "Replication Summary" -Weight Bolder -Wrap
if ($Statistics.Failures -gt 0) {
$Summary = "There are $($Statistics.Failures) servers with replication issues. Please take a look and fix ASAP."
} else {
$Summary = "All servers are in good shape. Keep up the good work!"
}
New-AdaptiveTextBlock -Text $Summary -Subtle -Spacing None -Wrap
}
}
New-AdaptiveContainer {
New-AdaptiveTextBlock -Text "ad.evotec.pl" -Size Medium -Wrap
New-AdaptiveTextBlock -Text "" -Subtle -Spacing None -Wrap
New-AdaptiveTextBlock -Text (Get-Date)
}
New-AdaptiveContainer {
New-AdaptiveColumnSet {
New-AdaptiveColumn {
New-AdaptiveTextBlock -Text "â–² $($Statistics.Good) servers with good replication" -Color Good -Spacing None
New-AdaptiveTextBlock -Text "â–¼ $($Statistics.Failures) servers with failing replication" -Color Attention -Spacing None
} -Width Stretch
New-AdaptiveColumn {
New-AdaptiveFactSet {
foreach ($Entry in $Statistics.GetEnumerator() | Select-Object -Skip 1 -Last 5) {
New-AdaptiveFact -Title $Entry.Key -Value $Entry.Value
}
}
} -Width Auto
}
} -Spacing None
} -FullWidth
And what do you get? Nice and fancy replication summary in Teams 
What do I need?
To get it up and running you just need to:
Install-Module PSWriteHTML -Force -Verbose Install-Module ADEssentials -Force -Verbose # if you like emails Install-Module Mailozaurr -Force -Verbose # if you like teams Install-Module PSTeams -Force -Verbose
Once modules are installed, you only modify the email body to suit your needs and send an email splat with the proper parameters, as your email provider requires. Alternatively, you can change the team's template or use it as is via Teams Incoming Webhooks. If you need more details on how to configure PSTeams, Mailozaurr, or use email-building functionality with PSWriteHTML, I invite you to search via multiple blogs that cover this functionality.
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