Answer by ader1990 for My heat template is like: windows_instance: type: OS::Nova::Server properties: image: {get_param: imagever } flavor: m1.large key_name: test networks: - port: { get_resource: publicport } user_data_format: RAW user_data: str_replace: template: | #ps1 testps "$srcurl" "$dest" -Verbose params: $dest: { get_param: target_location } $srcurl: { get_param: url_src } testps: { get_file: test1.ps1 } test1.ps1 : param([String]$src, [String]$dest) Write-Host "url is:" + $src write-host "dest is:" + $dest But cloudbase-init.log reported: executeuserdatascript C:\Program Files (x86)\Cloudbase Solutions\Cloudbase-Init\Python27\lib\site-packages\cloudbaseinit\plugins\windows\userdatautils.py:58 2015-04-27 18:40:06.905 1788 DEBUG cloudbaseinit.plugins.windows.userdatautils [-] Userdata stderr: The term 'param' is not recognized as the name of a cmdlet, function, script fi le, or operable program. Check the spelling of the name, or if a path was inclu ded, verify that the path is correct and try again. At C:\Users\cloudbase-init\appdata\local\temp\6ea2afb5-645b-430c-91a2-a67c3201f 5db.ps1:7 char:7 param <<<< ([String]$src, [String]$dest) CategoryInfo : ObjectNotFound: (param:String) [], CommandNotFou ndException FullyQualifiedErrorId : CommandNotFoundException So what is the correct way to pass parameter to a powershell script using heat template?

Hello, You have here some complete examples of Heat templates with PowerShell https://github.com/openstack/heat-templates/blob/master/hot/Windows Hope it helps.