Redfish on OpenBMC
dkodihal at linux.vnet.ibm.com
Thu Feb 1 21:53:01 AEDT 2018
On 01/02/18 2:38 pm, Hariharasubramanian Ramasubramanian wrote:
> 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.
OpenBMC systems already have a "resource model" in the form of the D-Bus
object hierarchy. Do you envision having a separate model to depict the
Redfish hypermedia resources, or coming up with a way to map Redfish
resources to D-Bus objects? This probably ties into the point about how
easy it is to take the implementation and run it outside OpenBMC.
> 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 !
> Inactive hide details for ---01/31/2018 10:17:36 PM---So, I think that
> the first thing we ought to do is get a survey of the di---01/31/2018
> 10:17:36 PM---So, I think that the first thing we ought to do is get a
> survey of the different implementations tha
> From: <Michael.E.Brown at dell.com>
> To: <bradleyb at fuzziesquirrel.com>
> Cc: <alirhas at microsoft.com>, <Balaji.B.Rao at dell.com>,
> <Paul.Vancil at dell.com>, <ed.tanous at intel.com>, <rolfb at us.ibm.com>,
> <jwcarman at us.ibm.com>, <hramasub at in.ibm.com>, <pradeep.kumar36 at tcs.com>,
> <openbmc at lists.ozlabs.org>
> 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 somewhere.
> - 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 fuzziesquirrel.com]
> Sent: Tuesday, January 30, 2018 7:30 PM
> To: Brown, Michael E <Michael_E_Brown at Dell.com>
> Cc: alirhas at microsoft.com; Rao, Balaji B <Balaji_B_Rao at dell.com>;
> Vancil, Paul <Paul_Vancil at Dell.com>; Tanous, Ed <ed.tanous at intel.com>;
> rolfb at us.ibm.com; jwcarman at us.ibm.com; Hariharasubramanian
> Ramasubramanian <hramasub at in.ibm.com>; pradeep.kumar36 at tcs.com; OpenBMC
> Maillist <openbmc at lists.ozlabs.org>
> 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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