{"id":2657,"date":"2013-01-03T12:11:16","date_gmt":"2013-01-03T17:11:16","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=2657"},"modified":"2013-01-03T12:11:16","modified_gmt":"2013-01-03T17:11:16","slug":"hyper-v-id-hash-table","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2657\/hyper-v-id-hash-table\/","title":{"rendered":"Hyper-V ID Hash Table"},"content":{"rendered":"

\"Microsoft<\/a>In Hyper-V, one of the challenges (at least that I've run into) has to do with naming. In addition to a name, Hyper-V objects such as virtual machines, are identified with a GUID. Most of the VM-related PowerShell cmdlets will let you specify a virtual machine name. But sometimes you'll run across the GUID and wonder what is the corresponding virtual machine. Here's a WMI query using Get-CIMInstance that shows the currently open terminal connections to a few virtual machines.<\/p>\n


\nPS C:\\> get-ciminstance -Namespace root\\virtualization -class msvm_terminalconnection | Select connectionID,installdate<\/p>\n

connectionID installdate
\n------------ -----------
\nMicrosoft:13876524-BFD8-40A1-95E3-926E37ACFBAB\\1 1\/3\/2013 11:27:50 AM
\nMicrosoft:80E967E6-57F9-4ECF-998A-D07B20B2287F\\2 1\/3\/2013 8:12:56 AM
\nMicrosoft:E1EDE8DA-D632-4F77-81C4-B117FFF1FE15\\1 1\/3\/2013 8:08:35 AM<\/p>\n

<\/code><\/p>\n

The GUID in the connection ID corresponds to a virtual machine. Here's my approach for \"translating\" the GUID to a name. Every VM has an ID.<\/p>\n


\nPS C:\\> (get-vm chi-dc01).id<\/p>\n

Guid
\n----
\nf7d3ad8b-6329-43a3-991e-8a630a94ec40
\n<\/code><\/p>\n

There is also an VMID property but that is merely an alias to ID. As you can see, the ID is a GUID object so to get just the GUID string takes another step.<\/p>\n


\nPS C:\\> (get-vm chi-dc01).id.guid
\nf7d3ad8b-6329-43a3-991e-8a630a94ec40
\n<\/code><\/p>\n

Now that I know how to capture this information, I can build a \"lookup\" object using a hash table.<\/p>\n


\nPS C:\\> Get-VM | Group-Object -property {$_.ID.GUID} -AsHashTable -AsString
\n<\/code><\/p>\n

Here's what I end up with:<\/p>\n

\"vmidhash\"<\/a><\/p>\n

Naturally, it makes more sense to save this to a variable.<\/p>\n


\nPS C:\\> $vmhash = Get-VM | Group-Object -property {$_.ID.GUID} -AsHashTable -AsString
\n<\/code><\/p>\n

The VM GUID is the key and the VM object is the value. I can get items a few ways.<\/p>\n


\nPS C:\\> $vmhash.'13876524-bfd8-40a1-95e3-926e37acfbab'<\/p>\n

Name State CPUUsage(%) MemoryAssigned(M) Uptime Status
\n---- ----- ----------- ----------------- ------ ------
\nCHI-FP01 Running 0 761 03:34:51 Operating normally<\/p>\n

PS C:\\> $vmhash.item('13876524-bfd8-40a1-95e3-926e37acfbab')<\/p>\n

Name State CPUUsage(%) MemoryAssigned(M) Uptime Status
\n---- ----- ----------- ----------------- ------ ------
\nCHI-FP01 Running 0 761 03:35:11 Operating normally<\/p>\n

PS C:\\> $vmhash.GetEnumerator() | where {$_.name -match '13876524-bfd8-40a1-95e3-926e37acfbab'} | se
\nlect -ExpandProperty Value<\/p>\n

Name State CPUUsage(%) MemoryAssigned(M) Uptime Status
\n---- ----- ----------- ----------------- ------ ------
\nCHI-FP01 Running 0 761 03:36:29 Operating normally
\n<\/code><\/p>\n

Now I can add some logic to my Get-CIMInstance command to resolve the GUID to the VM name.<\/p>\n


\n$vmhash = Get-VM | Group-Object -property {$_.ID.GUID} -AsHashTable -AsString<\/p>\n

Get-CimInstance -Namespace root\\virtualization -class msvm_terminalconnection |
\nSelect @{Name=\"Started\";Expression={$_.installdate}},
\n@{Name=\"RunTime\";Expression={(Get-Date)-$_.InstallDate}},
\n@{Name=\"VM\";Expression={
\n #define a GUID regex
\n [regex]$rx=\"(\\{){0,1}[0-9a-fA-F]{8}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{4}\\-[0-9a-fA-F]{12}(\\}){0,1}\"<\/p>\n

$guid = $rx.Match($_.ConnectionID).Value
\n $vmhash.item($guid).Name
\n}}
\n<\/code><\/p>\n

I also tweaked a few other properties. I extracted the GUID using a regular expression and then found the corresponding entry in the hash table. I could have added a little extra logic to test if the GUID existed as a key but I decided to just plow ahead. <\/p>\n

\"vmidhashlookup\"<\/a><\/p>\n

The hash table makes it very easy now to resolve virtual machine GUID's to a user friendly name.<\/p>\n","protected":false},"excerpt":{"rendered":"

In Hyper-V, one of the challenges (at least that I’ve run into) has to do with naming. In addition to a name, Hyper-V objects such as virtual machines, are identified with a GUID. Most of the VM-related PowerShell cmdlets will let you specify a virtual machine name. But sometimes you’ll run across the GUID and…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[401,4,407],"tags":[199,573,534],"class_list":["post-2657","post","type-post","status-publish","format-standard","hentry","category-hyper-v","category-powershell","category-windows-server-2012","tag-hashtable","tag-hyper-v","tag-powershell"],"yoast_head":"\nHyper-V ID Hash Table • The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/powershell\/2657\/hyper-v-id-hash-table\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hyper-V ID Hash Table • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"In Hyper-V, one of the challenges (at least that I've run into) has to do with naming. 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The hardware is at least 5 years old and my VMware license has expired. I can still bring up the server and see the virtual machines, but that's about it. I still keep the box so\u2026","rel":"","context":"In "Hyper-V"","block_context":{"text":"Hyper-V","link":"https:\/\/jdhitsolutions.com\/blog\/category\/hyper-v\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5744,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/5744\/extending-hyper-v-with-powershell\/","url_meta":{"origin":2657,"position":3},"title":"Extending Hyper-V with PowerShell","author":"Jeffery Hicks","date":"November 7, 2017","format":false,"excerpt":"Lately I've been writing about my use of PowerShell type extensions as a way to get more done quickly. Or at least give me the information I want with minimal effort. I use Hyper-V a great deal and the Hyper-V cmdlets are invaluable. And while a command like Get-VM provides\u2026","rel":"","context":"In "Hyper-V"","block_context":{"text":"Hyper-V","link":"https:\/\/jdhitsolutions.com\/blog\/category\/hyper-v\/"},"img":{"alt_text":"image","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2017\/11\/image_thumb-4.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2017\/11\/image_thumb-4.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2017\/11\/image_thumb-4.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2017\/11\/image_thumb-4.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":4457,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/4457\/creating-a-hyper-v-vm-memory-report\/","url_meta":{"origin":2657,"position":4},"title":"Creating a Hyper-V VM Memory Report","author":"Jeffery Hicks","date":"July 20, 2015","format":false,"excerpt":"I use Hyper-V to run my lab environment. Since I work at home I don't have access to a \"real\" production network so I have to make do with a virtualized environment. Given budgetary constraints I also don't have a lot of high end hardware with endless amount of RAM\u2026","rel":"","context":"In "Hyper-V"","block_context":{"text":"Hyper-V","link":"https:\/\/jdhitsolutions.com\/blog\/category\/hyper-v\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4685,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/4685\/adding-some-power-to-hyper-v-vm-notes\/","url_meta":{"origin":2657,"position":5},"title":"Adding Some Power to Hyper-V VM Notes","author":"Jeffery Hicks","date":"December 15, 2015","format":false,"excerpt":"I use they Hyper-V virtual machine note to store system information. 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