Hi Folks
I am wondering if External resolution monitor has been removed from DNS MP? I need to create a monitor or rule that runs on the DNS server to query an address frequently. If 3 queries are failed, generate an alert.
Should I write a Powershell script and create a script monitor? In this case, please point me to the document where I can learn about powershell monitoring.
Thanks in advance.
Hi @Pauciloquent,
I didn't have the chance to test the script itself, but if your are collecting the proper data in your property bags (see belolw hpw yyou can test thiss - the artcle i pasted), then the steps that you need to do to make the script work, are descriibed here (an article I wrote about how to integrate a PowerShell script with SCOM) and run it on your SCOM management server:
Monitoring Active Directory User Account Expiration using SCOM and PowerShell (Step by Step Guide)
https://www.pohn.ch/monitor-active-directory-user-account-expiration-using-scom-and-powershell-step-by-step-guide/
You will see in the article how to test you script and make sure it returns the right proerty bags and also how to integrate in SCOM. It has also nice screennshots and lots of details. Please post back if you need further help.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Stoyan Chalakov
As Per @StoyanChalakov instructions. I downloaded the Community Powersell monitoring MP and imported to my SCOM 2019 environment.
param([string]$Arguments)
$ScomAPI = New-Object -comObject "MOM.ScriptAPI"
$PropertyBag = $ScomAPI.CreatePropertyBag()
$output = $Null
$count = 0
for ($i=1; $i -le 3: $i++)
{
$output = resolve-DNSname -name abc.com.au -server $emv:COMPUTERNAME -erroraction SilentlyContinue
if ($output -eq $Null)
{
$count++
}
sleep 3
}
if ($count -eq 3)
{
$PropertyBag.AddValue("State","Failure")
}
else
{
$PropertyBag.AddValue("State","Success")
}
$PropertyBag
======================
Set the unhealthy expression: "Property[@Name='State') equals Failure
Set the healthy expression: "Property[@Name='State') equals Success
Enabled the monitor for relevant DNS serverx via override
Hi @Pauciloquent,
you have a custom use case, so I would also use PowerShell if I had to solve this same challenge. What you need is:
Cookdown's PowerShell MP, so that you can build a PowerShell based monitor.
PowerShell Authoring
https://www.cookdown.com/scom-essentials/powershell-authoring
The link contains also a refernce to a video, where you can see how to create Property Bags and pass their values to SCOM.
You can use the following cmdlets to build your script, depending on the particular use case and requirements:
Resolve-DnsName
https://docs.microsoft.com/en-us/powershell/module/dnsclient/resolve-dnsname?view=windowsserver2022-ps
Here you can lookup some examples:
Resolve-DnsName: Resolving DNS Records with PowerShell
https://adamtheautomator.com/resolve-dnsname/
Don't hesitate to ask if you have further questions.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Stoyan Chalakov
I have wrote a script that will resolve the address using specific DNS server, Now I don't want to run that script on any server but looking for a way that SCOM runs it from the management server as a monitor and if it couldn't resolve the address using that specific DNS server, generates an alert. How can I do it?
Here is the script:
param([string]$Arguments)
$ScomAPI=new-object -comObject "MOM.ScriptAPI"
$PropertyBag = $ScomAPI.CreatePropertyBag()
$output = $Null
$Count = 0
for ($i=1; $i -le 3; $i++)
{
$output = resolve-DNSName -name <address> -server <DNS Server> -erroraction SilentlyContinue
if ($output -eq $Null)
{
$count++
}
sleep 3
}
if ($count -eg 3)
{
$PropertyBag.AddValue("State","Failure"
}
else
{
$PropertyBag.AddValue("State","Success")
}
$PropertyBag
Once I create a monitor and disabled it by default. Now override it for which server?
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