V3 API: List All VMs

  • 31 August 2020
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I was writing a quick PowerShell script this morning and I wanted to get all of the VMs in Prism Central via the v3 API calls. I was struggling with the syntax until I found this post:
v3 - vms/list - Host to get full list of VMs?

 

The post lead me to this article:

The Five Hundred (500+ VMs via v3 API)

 

The article lead me to this code sample:

list_vm_v3_large.py

 

After reading those articles a few times I still didn’t understand what I needed to do...I finally figured it out. I could piece together the v3 API call, but I couldn’t get the correct number of VMs to return. After hitting the wall a few times I figured out the part I didn’t understand: the relationship between length and offset.

Here is what you need to understand:

  • The “api/nutanix/v3/vms/list” v3 API command method is POST. That means you must include “body” in your API call
  • To get the total number of VMs you can use this JSON:
    {
    "kind":"vm"
    }

    Note: This will give you the total number of VMs in the cluster/PC. The results will look like this:

  • To get the first 500 VMs, your JSON body should look like this:
    {
    "kind": "vm",
    "length":500,
    "offset":0
    }

    Note: Offset is the index number. You need to tell the cluster/PC to get 500 VMs (length = 500) and to  start at “index = 0” (offset = 0)

  • To get the next 500 VMs your JSON body should look like this:

    {
    "kind": "vm",
    "length":500,
    "offset":500
    }

    Note: You need to tell the cluster/PC to get 500 VMs (length = 500) and to start at “index = 500” (offset = 500) → the “index” starts at 0 so the second request would need to be 500 (we are telling the API call to start at “index = 500” so we don’t duplicate information and we get the correct information)

  • To get the last batch of VMs, your JSON body should look like this:

    {
    "kind":"vm",
    "length":500,
    "offset":1000
    }

    Note: You need to tell the cluster/PC to get 500 VMs (length = 500) and to start at “index = 1000”. 

In this example that will get all 1407 VMs. The code example I included above included a python script that determines how many VMs are in the cluster/PC and makes the appropriate number of calls and adjusts the JSON body included in the v3 API call. I haven’t figured out how to do that in PowerShell yet so I just did it manually.

Hopefully this helps someone save a few minutes...


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