Service fabric change application count without having to redeploy the whole package - azure-service-fabric

Question

Is is possible to decrease the instance count of an application hosted in Service fabric without having to redeploy the whole package.
When I deployed it the application instance count is set to -1. now I would like to reduce it to 3

Answer 1

Here is the powershell script I'm using. It will translate xml to powershell parameter and run Start-ServiceFabricApplicationUpgrade with it:
Param
(
[Parameter(Mandatory=$true)]
[String]
$ApplicationName,
[Parameter(Mandatory=$true)]
[String]
$ApplicationTypeVersion,
[Parameter(Mandatory=$true)]
[String]
$ApplicationParameterFile
)
function Read-ApplicationParameters
{
Param (
[ValidateScript({Test-Path $_ -PathType Leaf})]
[String]
$ApplicationParameterFile
)
$applicationParameterXml = [Xml] (Get-Content $ApplicationParameterFile)
$applicationParameter = #{}
$applicationParameterXml.Application.Parameters.ChildNodes | Foreach {$applicationParameter[$_.Name] = $_.Value}
return $applicationParameter
}
$appParams = Read-ApplicationParameters $ApplicationParameterFile
Start-ServiceFabricApplicationUpgrade -ApplicationName $ApplicationName -ApplicationTypeVersion $ApplicationTypeVersion -ApplicationParameter $appParams -UnmonitoredAuto
Take latest application parameters xml file
Modify values you want to update (leave the other one untouched)
Connect to the cluster
Run Get-ServiceFabricApplication
Run the script above and take ApplicationName, ApplicationTypeVersion values from execution of point 4. ApplicationParameterFile is path to the newly modified xml file.
Monitor upgrade by using Get-ServiceFabricApplicationUpgrade -ApplicationName fabric:/MyApp
Once it is done, verify parameters by running Get-ServiceFabricApplication again.