[Xymon] Windows PS client svcs data missing
Scot Kreienkamp
SKreien at la-z-boy.com
Mon Jun 6 16:10:46 CEST 2011
David,
First, the services information is unreliable. This can fix that, if we can make it work.
If you are happy to do without the PID of currently running services, can probably grab service startup status from registry and be done with it.
[Scot Kreienkamp]
As long as the service shows the executable name I don't think the PID is required, and it's not shown now anyway. The pertinent information is Name, Start type, Status, and DisplayName. The PID can be found by using the EXE name on the CPU page if one needed that information.
Second, the PS client as a whole is a bit of a hog. It takes 8-10 seconds at 100% CPU to run with no logfiles. Contrast that with BBWin which takes 3-4 seconds including logfiles. I've already had two admins ask to remove the PS client because users were seeing an impact.
Completely agree that the overhead has to be as low as possible. A monitoring agent shouldn't impact unduly on what it is monitoring!
[Scot Kreienkamp]
So what can we do to lower the load? The only other suggestion I have is the WMI calls.
I did add the following line to the top of the PS client to get it to run at the lowest priority of the system:
get-Process -id $PID | foreach {$_.PriorityClass= [System.Diagnostics.ProcessPriorityClass]::Idle}
I can add an option to set the priority of the client at startup.
[Scot Kreienkamp]
Great!
that way hopefully it will cause less of an impact on the system as the PS client is strictly CPU load. I'll try using Ray's P/Invoke, but it may be above my head as I am not a programmer.
I really can't get excited about such gruesome delving into the bowels of Windows. A big attraction of using PS in the first place should be to avoid resorting to such ugly machinery. .Net classes and WMI is fair enough (as long as they don't overly burden the system), COM objects so-so, but directly invoking DLLs and similar seems pretty fragile as a long term proposition.
[Scot Kreienkamp]
I'm not excited about it either. Actually, I've given up on it. I'm not a programmer; Its over my head.
Just out of curiosity I rewrote the services piece in AutoIt because I can easily tap into DLL's. I know you don't want to branch things like that off to yet another technology, I just did it out of curiosity to see the difference between using .Net and WMI. It was a considerable difference. Not only was it much faster, but the CPU load was significantly less. If that holds true across the board, anything that could easily be moved off WMI calls to .Net calls would show a considerable return.
Thanks for being open minded and willing to take suggestions. J
Scot Kreienkamp
From: David Baldwin [mailto:david.baldwin at ausport.gov.au]
Sent: Wednesday, June 01, 2011 10:49 PM
To: Storer, Raymond
Cc: Scot Kreienkamp; xymon at xymon.com
Subject: Re: [Xymon] Windows PS client svcs data missing
I can't see that this code gets anything more than Get-Service - since Get-Service is an interface to [System.ServiceProcess.ServiceController]
Some of the info can be derived from the registry or running SC.EXE - registry interpretation requires information about enumerations for various keys, SC would require parsing output. Neither gives you information about the running process if there is one which also used by the client.
Looks like no way of getting away from the overhead of WMI - digging around for extra information or messing around with unstructured text will get you so far, but not all the info sought.
David.
PS C:\WINDOWS\system32\windowspowershell\v1.0> Get-WmiObject -Filter "Name='dnscache'" win32_service | fl *
Name : Dnscache
Status : OK
ExitCode : 0
DesktopInteract : False
ErrorControl : Normal
PathName : C:\WINDOWS\system32\svchost.exe -k NetworkService
ServiceType : Share Process
StartMode : Auto
__GENUS : 2
__CLASS : Win32_Service
__SUPERCLASS : Win32_BaseService
__DYNASTY : CIM_ManagedSystemElement
__RELPATH : Win32_Service.Name="Dnscache"
__PROPERTY_COUNT : 25
__DERIVATION : {Win32_BaseService, CIM_Service, CIM_LogicalElement, CIM_ManagedSystemElement}
__SERVER : ITMANSV
__NAMESPACE : root\cimv2
__PATH : \\ITMANSV\root\cimv2:Win32_Service.Name="Dnscache <file:///\\%5C%5CITMANSV%5Croot%5Ccimv2:Win32_Service.Name=%22Dnscache> "
AcceptPause : False
AcceptStop : True
Caption : DNS Client
CheckPoint : 0
CreationClassName : Win32_Service
Description : Resolves and caches Domain Name System (DNS) names for this computer. If this service is stopped, this computer will not be able to resolve DNS names and locate Active Directory domain controllers. If this service is disabled, any services that explicitly depend on it will fail to start.
DisplayName : DNS Client
InstallDate :
ProcessId : 872
ServiceSpecificExitCode : 0
Started : True
StartName : NT AUTHORITY\NetworkService
State : Running
SystemCreationClassName : Win32_ComputerSystem
SystemName : ITMANSV
TagId : 0
WaitHint : 0
Scope : System.Management.ManagementScope
Path : \\ITMANSV\root\cimv2:Win32_Service.Name="Dnscache <file:///\\%5C%5CITMANSV%5Croot%5Ccimv2:Win32_Service.Name=%22Dnscache> "
Options : System.Management.ObjectGetOptions
ClassPath : \\ITMANSV\root\cimv2:Win32_Service <file:///\\%5C%5CITMANSV%5Croot%5Ccimv2:Win32_Service>
Properties : {AcceptPause, AcceptStop, Caption, CheckPoint...}
SystemProperties : {__GENUS, __CLASS, __SUPERCLASS, __DYNASTY...}
Qualifiers : {dynamic, Locale, provider, UUID}
Site :
Container :
_______________________________________________________________________________________________________________________________________________
PS C:\WINDOWS\system32\windowspowershell\v1.0> Get-Service dnscache | fl *
Name : dnscache
RequiredServices : {Tcpip}
CanPauseAndContinue : False
CanShutdown : False
CanStop : True
DisplayName : DNS Client
DependentServices : {}
MachineName : .
ServiceName : dnscache
ServicesDependedOn : {Tcpip}
ServiceHandle : SafeServiceHandle
Status : Running
ServiceType : Win32ShareProcess
Site :
Container :
_______________________________________________________________________________________________________________________________________________
PS C:\WINDOWS\system32\windowspowershell\v1.0> Get-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Services\Dnscache
PSPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache
PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
PSChildName : Dnscache
PSDrive : HKLM
PSProvider : Microsoft.PowerShell.Core\Registry
Type : 32
Start : 2
ErrorControl : 1
ImagePath : C:\WINDOWS\system32\svchost.exe -k NetworkService
DisplayName : DNS Client
Group : TDI
DependOnService : {Tcpip}
DependOnGroup : {}
ObjectName : NT AUTHORITY\NetworkService
Description : Resolves and caches Domain Name System (DNS) names for this computer. If this service is stopped, this computer will not be able to resolve DNS names and locate Active Directory domain controllers. If this service is disabled, any services that explicitly depend on it will fail to start.
PS C:\WINDOWS\system32\windowspowershell\v1.0> sc.exe qc dnscache
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: dnscache
TYPE : 20 WIN32_SHARE_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\WINDOWS\system32\svchost.exe -k NetworkService
LOAD_ORDER_GROUP : TDI
TAG : 0
DISPLAY_NAME : DNS Client
DEPENDENCIES : Tcpip
SERVICE_START_NAME : NT AUTHORITY\NetworkService
On 2/06/11 8:50 AM, Storer, Raymond wrote:
Scott and David, I’m not finding any .net call that will produce the “StartupType” for a service that is already installed. There is a documented way to do it from a Win32 API; but, that involves using P/Invoke. See here: http://www.leeholmes.com/blog/2009/01/19/powershell-pinvoke-walkthrough/ and here: http://pinvoke.net/default.aspx/advapi32/QueryServiceConfig.html
Ray
From: Scot Kreienkamp [mailto:SKreien at la-z-boy.com]
Sent: Wednesday, June 01, 2011 11:03 AM
To: Storer, Raymond; David Baldwin
Cc: xymon at xymon.com
Subject: RE: [Xymon] Windows PS client svcs data missing
This is what I have so far:
function XymonSvcsNET2
{
$result = [reflection.Assembly]::LoadWithPartialName("System.ServiceProcess")
$Services = [System.ServiceProcess.ServiceController]::GetServices()
$COLUMNNAME="Name"
$COLUMNSTATUS="Status"
$COLUMNDESCRIPTION="Description"
#[Reflection.Assembly]::Load(‘System.ServiceProcess, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’)
#get all the services installed on the local machine
$serviceController = [System.ServiceProcess.ServiceController]::GetServices()
"[svcs]"
"--------------------------------------------------------------------------------------------------------------"
"{0,-50} {1,-20} {2,-20}" -f `
$COLUMNNAME, $COLUMNSTATUS, $COLUMNDESCRIPTION
"--------------------------------------------------------------------------------------------------------------"
foreach ($svc in $serviceController) {
"{0,-50} {1,-20} {2,-20}" -f `
$svc.Name, $svc.Status, $svc.DisplayName
}
}
I did get the formatting figured out finally after about 6 hours. The only piece that I cannot figure out is the service startup type, if I can get some help on that I think this is workable.
I'm a complete newbie at powershell, so comments/help appreciated.
Scot Kreienkamp
Senior Systems Engineer
skreien at la-z-boy.com
From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf Of Storer, Raymond
Sent: Monday, May 16, 2011 10:38 AM
To: David Baldwin
Cc: xymon at xymon.com
Subject: Re: [Xymon] Windows PS client svcs data missing
David, you can also use the “Load” method instead as follows:
[Reflection.Assembly]::Load(‘System.ServiceProcess, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’)
Ray
From: David Baldwin [mailto:David.Baldwin at ausport.gov.au]
Sent: Monday, May 16, 2011 12:39 AM
To: 'Scot Kreienkamp'; Storer, Raymond
Cc: xymon at xymon.com
Subject: RE: [Xymon] Windows PS client svcs data missing
Ray,
Thanks for the code. I’m a bit wary of using something with such a version specific path though – is that seriously a “standard” interface to a .Net DLL that can be expected to have some degree of persistence?
I’m offsite this week, will try to take a look next week.
Thanks, David.
From: Scot Kreienkamp [mailto:SKreien at la-z-boy.com]
Sent: Saturday, 14 May 2011 5:54 AM
To: Storer, Raymond; David Baldwin
Cc: xymon at xymon.com
Subject: RE: [Xymon] Windows PS client svcs data missing
Thank you Raymond… If I knew how to implement it I would. Hopefully David or Henrik can find the time to experiment with it.
I'm seeing all kinds of problems with the PS client…. If this keeps up I'll have to remove it. It pegged one of my servers at 100% for over an hour, stuck on the WMI yesterday.
Scot Kreienkamp
Senior Systems Engineer
skreien at la-z-boy.com
From: Storer, Raymond [mailto:storerr at nibco.com]
Sent: Friday, May 13, 2011 12:58 PM
To: David Baldwin; Scot Kreienkamp
Cc: xymon at xymon.com
Subject: RE: [Xymon] Windows PS client svcs data missing
Opps… I missed the “.” in the [Reflection.Assembly]. Also, you can pipe it to out-null to avoid any unwanted output. So:
[Reflection.Assembly]::LoadFile(‘C:\WINDOWS\Microsoft.Net\Framework\v2.0.50727\System.ServiceProcess.dll’) | out-null
Ray
From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf Of Storer, Raymond
Sent: Friday, May 13, 2011 11:40 AM
To: David Baldwin; Scot Kreienkamp
Cc: xymon at xymon.com
Subject: Re: [Xymon] Windows PS client svcs data missing
Scot and David, if you’d prefer to implement a .net pure call for services you can try the following:
# your path to the file may very
[ReflectionAssembly]::LoadFile(‘C:\WINDOWS\Microsoft.Net\Framework\v2.0.50727\System.ServiceProcess.dll’)
#get all the services installed on the local machine
$serviceController = [System.ServiceProcess.ServiceController]::GetServices()
foreach ($svc in $serviceController) {
# should indicate: Stopped, Running, or Paused … others???
write-host $svc.Status
# the service name
write-host $svc.Name
# the service display name
write-host $svc.DisplayName
}
Ray
[snip]
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notify us immediately by return email and promptly delete this message
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David Baldwin - IT Unit
Australian Sports Commission www.ausport.gov.au
Tel 02 62147830 Fax 02 62141830 PO Box 176 Belconnen ACT 2616
david.baldwin at ausport.gov.au Leverrier Street Bruce ACT 2617
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Keep up to date with what's happening in Australian sport visit www.ausport.gov.au
This message is intended for the addressee named and may contain confidential and privileged information. If you are not the intended recipient please note that any form of distribution, copying or use of this communication or the information in it is strictly prohibited and may be unlawful. If you receive this message in error, please delete it and notify the sender.
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This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, please note that you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by e-mail or by telephone at the above number. Thank you.
--
David Baldwin - IT Unit
Australian Sports Commission www.ausport.gov.au
Tel 02 62147830 Fax 02 62141830 PO Box 176 Belconnen ACT 2616
david.baldwin at ausport.gov.au Leverrier Street Bruce ACT 2617
This message is intended only for the individual or entity to which it is addressed. It may contain privileged, confidential information which is exempt from disclosure under applicable laws. If you are not the intended recipient, please note that you are strictly prohibited from disseminating or distributing this information (other than to the intended recipient) or copying this information. If you have received this communication in error, please notify us immediately by e-mail or by telephone at the above number. Thank you.
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