Trying to get a VM count on a host, why doesn't this work?

PowerShell Help
1

See below:


$vhost = "10.16.14.25"

function get-vmcount
{
$script:myvmcount = get-vmhost $vhost | Select @{N=“NumVM“;E={($_ | Get-VM).Count}}
#write-host "Total VM's on host $vhost = $myvmcount"
$myvmcount

}

get-vmcount
write-host "VM= $myvmcount"

all I get in the output is:

VM= @{NumVM=3}

 

Why?

2

It’s exactly what you’re asking for. What output are you expecting to get?

3

Not sure what benefit you are getting wrapping it in a function, but to answer your question you are returning an object and referencing the entire object versus a property in the object:

$vhost = “10.16.14.25”

$myvmcount = Get-VMHost-Name $vhost | 
             Select @{N=“NumVM“;E={($_ | Get-VM).Count}}

“VM Count = {0}" -f $myvmcount.NumVM
#or
“VM Count = {0}" -f $myvmcount | Select -ExpandProperty NumVM
4

Only had a function so I can reuse in other parts of a huge script. And I understand your explanation, had an idea it was something like that.

Just to be able to print out “The total number of VM’s on host HOST” = 3 (which is the actual number of VM’s on the host). I can do that.

Thank you.

5

This way it is even simpler…

[pre]

$vhost = “10.16.14.25”

$myvmcount = (Get-VM -ComputerName $vhost).Count

[pscustomobject]@{ VMCount = $myvmcount }

[/pre]

Thank you.

 

6

If you’re looking for simpler I’d recommend this snippet:

$vhost = '10.16.14.25'
[pscustomobject]@{ 
    VMCount = (Get-VM -ComputerName $vhost).Count 
}

:wink:

7

[quote quote=243842]If you’re looking for simpler I’d recommend this snippet:

$vhost = ‘10.16.14.25’
[pscustomobject]@{
VMCount = (Get-VM -ComputerName $vhost).Count
} :wink:

[/quote]

Olaf- I get the error "a parameter cannot be found that matches parameter name ‘ComputerName’. Verified code I entered to yours.

8

Also I am using VMware for virtualization

9

Okay, if it isn’t Hyper-V then what Rob suggested is the ideal way, but still, it can be in this way as well…

[pre]

$vhost = “10.16.14.25”

[pscustomobject]@{ VMCount = (Get-VMHost -Name $vhost | Get-VM).Count }

[/pre]

Thank you.
10

[quote quote=243935]Okay, if it isn’t Hyper-V then what Rob suggested is the ideal way, but still, it can be in this way as well…

$vhost = “10.16.14.25” [pscustomobject]@{ VMCount = (Get-VMHost -Name $vhost | Get-VM).Count } Thank you.[/quote]

Well, that works, sorta. I would like to print a line like “Toatal VM’s =” xx. Which is the variable I use, VMCount? Anyway after I incorporated this line in my code the command does not output anything until I exit the script. Maybe out-host? I had this issue before but damned if I remember how I fixed it.

 

…Alan

11

Like this?

$vhost = “10.16.14.25”

$obj = [pscustomobject]@{ VMCount = (Get-VMHost $vhost | Get-VM).Count}

Write-Host "Total VM's = $($obj.VMCount)"
$obj
12

What is the point of wrapping this into an object? It can simply be a variable:

$vhost = “10.16.14.25”

$VMCount = (Get-VMHost $vhost | Get-VM).Count

Write-Host "Total VM's = $VMCount"
13

Agreed if it’s just to write to the screen.