Redfish on OpenBMC

Hariharasubramanian Ramasubramanian hramasub at
Thu Feb 1 20:08:57 AEDT 2018

Hi Michael,

Thanks for  enumerating the attributes for comparison.

I want to list down a few additional criteria that may be evaluated:

1) Data-Driven Resource Discovery:
     - The Redfish server should ideally build it's resource model from a
"config file". This config file could potentially be hand-coded or built
out of a "system definition file". The following are examples of system
definition files for 2 of the systems currently running OpenBMC firmware.
The system architecture (sled vs blade etc.), number of processors, number
of fans etc. can be determined from the system definition file to generate
the config file.

The intent is to make the redfish implementation as system agnostic as

2) Separation of the Redfish front-end (view) and back-end (infrastructure)
layers. The infrastructure API exposed as dbus services would be one of the
means to make this separation of concerns.

3) Performance :
     - Runtime memory foot print.This could potentially  have a negative
impact on "how fast" the server is. Hence the trade-off should consider
what can be cached vs what needs to be queried from the infrastructure.
     - Michael, why did you consider SSL being separately implemented by
the Redfish server? Would this be in the scope of the webserver ?

4) Eventing: Current version of the Redfish spec has left it open for the
OEMs to define the specific Event Messages. i.e. there is no standard /
common Event Registry. Redfish server implementation on the OpenBMC should
define this common Event Registry and perhaps accepted by DMTF. Does the
Eventing support filtering of events based on the event type, source
resource and the message Id ?

5) Leverage existing open source projects:
   - Does the implementation compose existing services and frameworks ?
Such as a webserver(say, nginx) and a rest framework (flask).

Hari !

From:	<Michael.E.Brown at>
To:	<bradleyb at>
Cc:	<alirhas at>, <Balaji.B.Rao at>,
            <Paul.Vancil at>, <ed.tanous at>,
            <rolfb at>, <jwcarman at>,
            <hramasub at>, <pradeep.kumar36 at>,
            <openbmc at>
Date:	01/31/2018 10:17 PM
Subject:	RE: Redfish on OpenBMC

So, I think that the first thing we ought to do is get a survey of the
different implementations that are out there, and establish criteria for
judging different implementations.

Here would be a list of questions I would have for everybody on the list. I
think it would probably be best to compile all of these into a wiki page

   - Do you have a redfish server implementation?
   - Is it Open Source?
		 - If not, are you planning on open sourcing it?
		 - What is the license?
		 - Is it posted to github or other public source control?
   - Does it pass the DMTF redfish service validator?
   - What language is it written in?
   - How big is it?
   - Can it be easily extended/re-used by anybody else shipping compliant
openbmc implementations?
		 - Can you add OEM extensions to existing Redfish Resources
without "forking" the codebase?
		 - Can you change the implementation for a single Redfish
Resource Property without forking?
		 - Can you add new Redfish Resources without forking?
   - Performance
		 - How fast is it?
		 - Does it implement SSL?
   - Security
		 - What is the security model?
		 - Non-root support? Can it run as a non-privileged user?
		 - Does it implement basic authentication and the redfish spec
x-auth-token authentication?
		 - Does it implement the redfish standard privilege map model?
   - Eventing:
		 - For writing a UI on top of redfish, something like SSE is a
nice-to-have to avoid polling in the browser. There are a couple of
proposed SSE extensions that have not yet been approved.
		 		 - How much work to implement SSE support to do
things like watch Property changes?
		 - Is the standard redfish eventing model supported?
		 - Security model integrated with eventing? Do eventing records
get the same security treatment as GET requests?
   - Development: can it run outside of openbmc?
   - Special sauce: is there anything not captured above that makes the
implementation special in any way?


-----Original Message-----
From: Brad Bishop [mailto:bradleyb at]
Sent: Tuesday, January 30, 2018 7:30 PM
To: Brown, Michael E <Michael_E_Brown at>
Cc: alirhas at; Rao, Balaji B <Balaji_B_Rao at>; Vancil,
Paul <Paul_Vancil at>; Tanous, Ed <ed.tanous at>;
rolfb at; jwcarman at; Hariharasubramanian Ramasubramanian
<hramasub at>; pradeep.kumar36 at; OpenBMC Maillist
<openbmc at>
Subject: Redfish on OpenBMC

Hi Michael

The project could really use someone to get everyone that has expressed
interest in the future of Redfish support in OpenBMC rowing in the same
direction.  So thank you for volunteering to lead that conversation at the
community call yesterday.

I’ve CC’ed everyone that I know of that has expressed an interest.
OpenBMC community: feel free to speak up if you’d like to be involved and I
forgot you.

The only thing I’d ask is to please post links to any meetings, minutes, or
correspondence here on the list, so everyone can easily keep up with how
things are going or jump in to provide feedback.

thanks again


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