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Showing posts from April, 2017

Powershell: How to get REST API data in JSON format rather than XML using invoke-restmethod

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Summary:
I was exploring a REST API interface for an internal tool being built.  Being that I'm so accustomed to powershell, I wanted to explore how I could get data from it.  The Invoke-RestMethod is perfect for this, but I was having issues getting data back in straight json format.  Data kept coming back in ugly as hell xml format by default.

Details:
The short answer was that I need to make a hash table to pass to the -Header parameter of the invoke-method cmdlet.  Basically, it looks like this:

$Headers = @{"Accept" = "application/json"} Invoke-RestMethod -URI "https://myrestapi/endpoint" -Method:Get -Headers $Headers
Once I did this, I received the data back in json format and powershell automatically captures it as a system.array object.  Making it immensely easier to work with rather than the xml return.  See below pictures as examples of the difference.

As you can see, the return I received when in json looks like any other object return from s…

VMware: ESXi 6 503 Service Unavailable endpoint: [N7Vmacore4Http16LocalServiceSpecE:0x1f098b08] _serverNamespace = / _isRedirect = false _port = 8309)

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Summary:
Basically I enabled SR-IOV on the only two pNIC's I had in my ESXi host in my lab.  This doesn't necessarily cause a connectivity problem, but the ESXi management agents did not like this at all.  Meaning I could connect to my hosts, as evident in the error message, but the agents basically broke once SR-IOV was enabled on the only two physical uplinks I had.



Workaround:
Unfortunately, the only workaround I've found is to:

"Reset System Configuration" from DCUIThis basically bring ESXi back to default install config.  root password is blanked out, etc. etc. or
Re-Deploy the host.  For my testing though, I can enable on one of the physical uplinks and work w/ that just fine, just not both in my case.  The other aspect that I didn't realize is that the CNA cards I was using lose their Fiber Channel connectvity as well.

SR-IOV effectively changed my CNA cards to NIC adapters only.

Config:
ESXi 6.0 Build 5050593
Dell FX2 - FC630 - Qlogic 57810 adapters