A few examples on how to use the two cmdlets.
To try the cmdlets, type:
add-pssnapin mkropsmgr
This command adds the PowerShell snapin. This is required to use the cmdlets. You should only have to use this once in every session you run.
Get-RuleParameter -ClassCriteria "DisplayName like ‘%’" -RuleCriteria "DisplayName like ‘%’" –Verbose
This command will show you all overridable parameters from all rules. If you want to see the whole output, you should be patient 
This command also needs to be run on the RMS server, since it will default to the “localhost” value to connect to the SDK service and the user running the command must have sufficient privileges to query the SCOM environment.
Get-RuleParameter -RootManagementServer "RMS01" -Credential $myCred -ClassCriteria "DisplayName like ‘SQL%’" -RuleCriteria "DisplayName like ‘Collect%’" –Verbose
This command will show you all overrideable parameters of all classes, whose display name starts with “SQL” and for all rules whose display name start with “Collect”. The command will also try to connect to the RMS called “RMS01” and will ask for your credentials to use for connecting to this RMS. And finally it uses the –Verbose switch, to show additional information about the progress of the command.
add-pssnapin mkrOpsMgr
add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client";
set-location "OperationsManagerMonitoring::";
$con = new-managementGroupConnection -ConnectionString:"RMS01" -Credential $myCred;
$mp = get-managementpack | where {$_.Name -eq "mpTestRuleOverride"}
Set-RuleOverride -ManagementPack $mp -ClassCriteria "DisplayName=’SQL 2005 DB’" -RuleCriteria "DisplayName=’Collect Database Free Space (%)’" -Parameter "Enabled" -Value "False" -Verbose –Enforce
These commands will load both the mkrOpsMgr and the Microsoft Operations Manager snapin followed by a connection to the SDK on the server called “RMS01” (it will ask for credentials). It will retrieve the object for the “mpTestRuleOverride” management pack (which must exist) and will disable the rule with DisplayName “Collect Databse Free Space (%)” form the class with the DisplayName “SQL 2005 DB”. This is done by setting the parameter “Enabled” to “False”. This override is enforced with the –Enforce switch.
add-pssnapin mkrOpsMgr
add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client";
set-location "OperationsManagerMonitoring::";
$con = new-managementGroupConnection -ConnectionString:"RMS01" -Credential $myCred;
$mp = get-managementpack | where {$_.Name -eq "mpTestRuleOverride"}
Set-RuleOverride -RootManagementServer "RMS01" -Credential $myCred -ManagementPack $mp -ClassCriteria "DisplayName=’SQL 2005 DB’" -RuleCriteria "DisplayName=’Collect Database Free Space (%)’" -DataSource "DS" -Parameter "IntervalSeconds" -Value "7777"
These commands will override the rule “Collect Database Free Space (%)” from the class “SQL 2005 DB” and set the value for the “IntervalSeconds” parameter to 7777. Note that running these command a second time, will generate an error indicating there is an override conflict on the rule. You can use the override name shown by the error to change the existing override, using the –OverrideId parameter of the Set-OverrideRule cmdlet.
Running this command the second time on my system, resulted in the error shown below:
: Verification failed with [1] errors:
——————————————————-
Error 1:
: Failed to verify Override [mkrOpsMgr.SetOverrideRule.0888eee2d8754f47820bac3e7887d7d5].
Override [mkrOpsMgr.SetOverrideRule.0888eee2d8754f47820bac3e7887d7d5] is a duplicate to Override [mkrOpsMgr.SetOverrideRule.9415ca506dd540d683c907bbdf1062aa] de
fined within the same ManagementPack. Please remove any one of the duplicate overrides.
——————————————————-Failed to verify Override [mkrOpsMgr.SetOverrideRule.0888eee2d8754f47820bac3e7887d7d5].Override [mkrOpsMgr.SetOverrideRule.0888eee2d8754f47820bac3e7887d7d5] is
a duplicate to Override [mkrOpsMgr.SetOverrideRule.9415ca506dd540d683c907bbdf1062aa] defined within the same ManagementPack. Please remove any one of the duplic
ate overrides.
The blue OverrideId is the Id generated by the cmdlet when it was run for the second time. The red OverrideId is the existing one in the management pack. If you need to change an existing override, you should supply the existing OverrideId to the cmdlet:
add-pssnapin mkrOpsMgr
add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client";
set-location "OperationsManagerMonitoring::";
$con = new-managementGroupConnection -ConnectionString:"RMS01" -Credential $myCred;
$mp = get-managementpack | where {$_.Name -eq "mpTestRuleOverride"}
Set-RuleOverride -RootManagementServer "RMS01" -Credential $myCred -ManagementPack $mp -ClassCriteria "DisplayName=’SQL 2005 DB’" -RuleCriteria "DisplayName=’Collect Database Free Space (%)’" -DataSource "DS" -Parameter "IntervalSeconds" -Value "8888" -overrideid "mkrOpsMgr.SetOverrideRule.9415ca506dd540d683c907bbdf1062aa"
These commands will now set the same override to the new value of 8888
I now realize I have not implemented a method to remove an override, so a new version will be build
