I’ve been spending a lot of my free time working on a little side project with Python. Rather than waxing on about it, I’ll just post a very quick and dirty video, and the readme.md that will accompany my tool.
You can find the video here. Note that the issue (which worked out as a decent demo) in the video where there were a bunch of 400 errors has been fixed — you can blame silly Python sets not being ordered!
You can find the acitool library here.
ACIPDT – or ACI Power Deployment Tool – is a Python library that is intended to be used for network engineers deploying an ACI fabric. ACIPDT is very much early alpha, later releases should add additional features/functionality as well as optimization and improved error handling.
The “SDN” (hate the term, but it applies) movement has brought a great deal of discussion to the idea of how a network engineer deploys networking equipment. Historically text files, or perhaps macros in Excel have been used as templates for new deployments, and good old-fashioned copy/paste has been the actual deployment vehicle. Among other things, SDN is attempting to change this. With SDN we (networking folk) have been given APIs! However, most network engineers, myself included, have no idea what to do with said APIs.
Cisco ACI, as with the other networky “SDN products,” in the market have provided some nifty tools in order to begin the journey into this API driven next-generation network world, but the bar to entry in any meaningful way is still rather high. In example, ACI provides an API inspector, which displays the XML or JSON payloads that are configuring the ACI fabric, however the payload on its own of course doesn’t do much for a network guy – where am I supposed to paste that into? What became clear to me is that Postman was the obvious answer. Postman is a great tool for getting started with an API, and I have used it extensively with ACI, even to the point of deploying an entire fabric in 2 minutes with a handful of Postman collections. However…
Postman left much to be desired. I’m fairly certain that the way in which I was using it was never really the intended use case. In order to keep the collections to a reasonable size, which in turn kept spreadsheets relatively organized (spreadsheets contained the data to insert as a variable in the payloads), but then I had nine collections to run, which meant nine spreadsheets. On top of all of that, there was very little feedback in terms of even simple success/fail per post — and even if you captured that output, there would be things that would fail no matter what due to the way the spreadsheet was piping in variables (perhaps more on that later, maybe its just how I was using it).
The result of this frustration is the ACIPDT. My intention is to re-create the functionality that I have used Postman for in Python. In doing so, the goal is to have a single spreadsheet (source of data, could be anything but a spreadsheet is easy), to run a single script, and to have valuable feedback about the success or failure of each and every POST. ACIPDT itself is not a script that will configure your ACI fabric, but is instead a library that contains ReST calls that will configure the most common deployment scenarios. In addition to the library itself, I have created a very simple script to ingest a spreadsheet that contains the actual configuration data and pass the data to the appropriate method in the library.
– Have a library that is de-coupled from any deployment type of script.
– This was a goal after early attempts became very intertwined and I was unable to cleanly separate the simple ReST call/payload from the rest of the script.
– Run one script that references one source of data.
– This is more relevant to the run script than it is to the library, but it was taken into consideration when creating the library. A single spreadsheet (with multiple tabs) is used to house all data, is parsed in the run script, then data is passed as kwargs to the appropriate methods for deployment.
– Have discreet configuration items.
– Ensure that an Interface Profile on an L3 Out can be modified without deleting/re-creating the parent object. While this library/script is intended for deployments where this is likely not a big deal, it was at any rate a design goal.
– Capture the status of every single call.
– Each method returns a status code. The run script simply enters this data into the Excel spreadsheet at the appropriate line so you know which POSTs failed and which ones succeeded. This is a simplistic status check, but is leaps better than I was getting with Postman.
I believe the code to be relatively straight-forward (and I am very not good at Python), and have provided comments ahead of every method in the library to document what is acceptable to pass to the method. As this is really just a pet project on the weekends, that’s probably about it from a resources perspective. Feel free to tweet at me (@carl_niger) if you run into any issues or have a burning desire for a feature add.
## Code Example
# Import acidpt from the acitool library from acitool import acipdt # Initialize the FabLogin class with the APIC IP, username, and password fablogin = acipdt.FabLogin(apic, user, pword) # Login to the fabric and capture the challenge cookie cookies = fablogin.login() # Initialize the Fabric Pod Policy class with the APIC IP and the returned cookies from the login class podpol = acipdt.FabPodPol(apic, cookies) # Configure an NTP server of 126.96.36.199 status = podpol.ntp('188.8.131.52', 'created,modified')
## Getting Started
To get started, unzip the zip file and place the entire contents in a directory in your Python path. For me (using OSX), I placed the folder in /usr/local/lib/python2.7/. You can then import as outlined in the code example above.
This is NOT fancy code. It is probably not even “good” code. It does work (for me at least!) though.