Redfish event log for new local user addition

Puli, Apparao apparao.puli at
Sat May 30 01:45:11 AEST 2020

[Subject changed to reflect actual context]

Hi Ratan,

   With current OpenBMC, I don't any event log getting added for new 
local user creation. To implement that below are two place we need to 
add support:

1) Define an new message retry ID for user addition(say UserAdded) in 

2) Add a event log during new user addition inside 
phospor-user-manager(createUser function).

While you are adding event log for new local user creation, Please 
consider other case too( Like Delete, Update, Rename etc..)



On 5/28/2020 6:56 PM, Ratan Gupta wrote:
> Hi Appu,
> Can you get me an example say if I want an redfish event to be 
> generated once any local user gets added on the BMC.
> What would be the steps to be done with the current design and 
> where(which repo)?
> On 5/28/20 12:28 AM, Puli, Apparao wrote:
>> Rajes,
>>    The dictionary to map Redfish resourceType and D-Bus object path( 
>> I believe URI intern) is good. It will be great if you share design 
>> document, if its done.
>> At the moment, redfish event logs file(/var/log/redfish) doesn't have 
>> ResourceTypes and OriginResource fields. The Existing redfish event 
>> log implementation(log service) also doesn't have support for that. 
>> You can propose design change for same along with how it is used in 
>> event log service. Same thing, can be adopted to EventService, once 
>> its agreed by OEM's( I am thinking, it should go under new OEM 
>> specific compiler flag. But that we can ratify later).
>> Thanks,
>> -Appu
>> On 5/27/2020 5:20 PM, RAJESWARAN THILLAIGOVINDAN wrote:
>>> Apparao,
>>> Thanks a lot for your suggestions. We lean towards using a 
>>> dictionary to map Redfish ResourceType to D-Bus objects path and 
>>> vice versa and then using D-Bus match to generate life cycle events. 
>>> This way, the changes are limited to bmcweb. The resource type and 
>>> the origin resource URI will be included in the event log. This 
>>> requires change in the format of event log file /var/log/redfish. I 
>>> have commented the same in the server sent event patch that you have 
>>> uploaded. Kindly see if you can leave the parsing of file to the 
>>> OEMs. That way, the existing infrastructure can be used by the OEMs 
>>> to support other filtering mechanisms as defined in the specification.
>>> Thanks,
>>> Rajes
>>> On 27-05-2020 09:18, Puli, Apparao wrote:
>>>> Hi Rajeswaran,
>>>>   Thanks for your mail. At the moment, I don't have plans to 
>>>> support the "ResourceTypes", "OriginResources" based filtering.  
>>>> Basically Intel uses file systems based redfish event logs( 
>>>> journalctl -> rsync-> filesystem) and doesn't use D-Bus mechanism 
>>>> like IBM uses. So I am not much familiar with D-Bus logging but 
>>>> some of the suggestions:
>>>>  1) While logging redfish events over D-Bus itself,  it can provide 
>>>> details on ResourceTypes and OriginResource URI/Path.
>>>>      This is ideal and most efficient way. Since  we walked a 
>>>> walked long distance from start, Its hard to modify all the 
>>>> services to uses these 2 new input parameters while logging events( 
>>>> Requires change in almost all repo's)
>>>> 2) For resourcesTypes: Can have mapping dictionary against all 
>>>> MessageId's. For OriginResources: I believe, event log over D-Bus 
>>>> is already holding the Path. If so, last 3/4 nodes of uri can be 
>>>> taken and mapped against the resources and that can be used in 
>>>> Event filtering. We did used same mechanism in case of telemetry  
>>>> while mapping MetricReportDefinitions to URI.
>>>> Hope this helps.
>>>> Thanks,
>>>> -Appu
>>>> On 5/26/2020 5:50 PM, RAJESWARAN THILLAIGOVINDAN wrote:
>>>>> Apparao,
>>>>> I see that you have uploaded a 
>>>>> patch( 
>>>>> for supporting server sent events. This patch supports event 
>>>>> filtering based on registry prefix  and/or messageId.
>>>>> I would like to know if you have any plan to support event 
>>>>> filtering based on resource type. If so, I would like to work 
>>>>> together for a better solution. Earlier, I have proposed a 
>>>>> solution based on D-Bus match using a dictionary. With that 
>>>>> approach, the major challenge is to map Redfish resource and 
>>>>> properties to D-Bus object and properties respectively.   If D-Bus 
>>>>> applications are modified to include resource type and origin of 
>>>>> condition in the event, then there is no need for a map. But,that 
>>>>> brings Redfish terminology to the application. Also, this will 
>>>>> become an overhead if an OEM is not interested in Redfish event 
>>>>> service.
>>>>> Thanks,
>>>>> Rajes
>>>>> On 25-02-2020 19:36, Puli, Apparao wrote:
>>>>>> Hi Ratan,
>>>>>>    Comments in-line
>>>>>> On 2/24/2020 12:07 PM, Ratan Gupta wrote:
>>>>>>> Hi Apparao,
>>>>>>> On 2/20/20 12:49 AM, Puli, Apparao wrote:
>>>>>>>> Hi,
>>>>>>>>   I am sorry for late response as this mail is buried under and 
>>>>>>>> got struck back of my mind.
>>>>>>>> As i did mentioned in EventService design document, EventLog 
>>>>>>>> Monitor service is not common across the organizations( 
>>>>>>>> Example: Intel uses the redfish event logs file and inotify 
>>>>>>>> mechanism for monitoring the event logs. Where as IBM uses 
>>>>>>>> d-bus event log mechanism and they can relay on match rules). 
>>>>>>>> That said challenges with ResourceType mapping will be 
>>>>>>>> different in both monitoring mechanisms. This is good point. 
>>>>>>>> Initially when i started EventService design, i thought we can 
>>>>>>>> have mapping in bmcweb for ResourceTypes with set of 
>>>>>>>> MessageID's for Logged events ( As per Intel design) but not 
>>>>>>>> sure that may become difficult when we expand supported 
>>>>>>>> ResourceTypes.
>>>>>>> If I am getting correctly, Here is the flow which Intel uses.
>>>>>>>  1. Individual repo have to push the logs using sd_journal_send
>>>>>>>     which will write to the file(/var/log/redfish) by using
>>>>>>>     rsyslog daemon
>>>>>>> sd_journal_send("MESSAGE=%s","journal text","PRIORITY=%i", <LOG_LEVEL>,
>>>>>>>                  "REDFISH_MESSAGE_ID=%s",
>>>>>>>                  "ResourceEvent.1.0.ResourceCreated",NULL);
>>>>>>>       * How you would populate the "OriginOfCondition" during
>>>>>>>         sending of event?
>>>>>>>         (
>>>>>> Currently in logServices( logEntry),  we are not reporting the 
>>>>>> "OriginOfCondition" property as per schema. I will check with 
>>>>>> Jason( Who wrote the logService) and get back on this.
>>>>>> BTW can you give me how this information is fetched in IBM way of 
>>>>>> LogService implementation( D-Bus)? If you already ratified any 
>>>>>> such, i think we can leverage.  If not, We work together for 
>>>>>> solution.
>>>>>>>       * Any plan to add resource path in this journal message
>>>>>>>         which tells that this is the path for which resource
>>>>>>>         created event generated.
>>>>>> Same as above.
>>>>>>>       * Would the path be "Redfish Path/ D-bus Path"?
>>>>>> As per Redfish specification, This should be "" which 
>>>>>> means it should be of resource uri and so we can't use d-bus path 
>>>>>> here for OriginOfConditions.
>>>>>>>       * Where the mapping would be done between
>>>>>>>         D-busPath/Redfish Resource path?
>>>>>>>           Cons: Every application have to make the change(use sd_journal_send).
>>>>>>>           My thought is backend application should not be aware of the redfish terminlogy.
>>>>>> Having separate process only for this mapping may not be good( No 
>>>>>> different from maintaining that map inside bmcweb as there won't 
>>>>>> be any other consumers). Ideal way is, that should be mapped 
>>>>>> while logging logEntry's itself. But we are not doing it 
>>>>>> currently which need to be re-looked. Give me some time, I will 
>>>>>> think and check with other folks and get back.
>>>>>>> *2.* Some application(bmcweb) would do the Inotify on the 
>>>>>>> path(/var/log/redfish) and send the event once there is any 
>>>>>>> activity on this file.
>>>>>>> > I thought we can have mapping in bmcweb for ResourceTypes with set of MessageID's for Logged events ( As 
>>>>>>> per Intel design)
>>>>>>>      Can you explain more here. What is your plan? How you would do the Resource Type based event filtering?REDFISH_MESSAGE_ID is different than the resource type.
>>>>>> Initially i thought "ResourceType" based event filtering can be 
>>>>>> done using minimal mapping( Using MessageID and args). But that 
>>>>>> will work for minimal set. If the supported ResourceTypes grows, 
>>>>>> we will have bigger challenges which i can sense it now.  Anyway, 
>>>>>> Supported Resources are completely implementation specific. If 
>>>>>> this value is empty means, by default all event logs will be sent 
>>>>>> to subscribers. This is what we can start with before supported  
>>>>>> ResourceTypes list grows.
>>>>>>>> As per my reading from below query, You are looking at d-bus 
>>>>>>>> match rules and ResourceTypes mapping which is more specific to 
>>>>>>>> d-bus event logging(IBM way of implementing event logging). 
>>>>>>>> reading it from journal logs will give more information but 
>>>>>>>> that will impact the performance to large extent. This might be 
>>>>>>>> one of the reason why we (Intel) uses Redfish message ID while 
>>>>>>>> logging redfish events logs to journal(You can refer design 
>>>>>>>> document for same at 
>>>>>>>> In opinion, in your d-bus if you are using some kind of 
>>>>>>>> filter(Example REDFISH_MESSAGE_ID) while logging in journal 
>>>>>>>> logs for all events and figure out the way to monitor the 
>>>>>>>> journal logs without impacting the performance, that should be 
>>>>>>>> ok as long as match filters are satisfied for Redfish 
>>>>>>>> EventService subscriptions and supported Types(Again differs 
>>>>>>>> with implementation).
>>>>>>>> Thanks,
>>>>>>>> -Appu
>>>>>>>> On 2/10/2020 1:52 AM, RAJESWARAN THILLAIGOVINDAN wrote:
>>>>>>>>> ApparaRao.
>>>>>>>>> As you have shown interest in this feature and submitted the 
>>>>>>>>> design document, do you have any opinion on this? Do you see 
>>>>>>>>> any merit in using D-Bus match in bmcweb to create event logs 
>>>>>>>>> for life cycle events?  Please feel free to weigh in.
>>>>>>>>> Thanks,
>>>>>>>>> Rajes
>>>>>>>>> On 01-02-2020 02:23, RAJESWARAN THILLAIGOVINDAN wrote:
>>>>>>>>>> Hi,
>>>>>>>>>> I am going through the bmcweb code for implementing Redfish 
>>>>>>>>>> EventService based on the design document 
>>>>>>>>>> This design is hooked to the journal based Redfish Event 
>>>>>>>>>> Logging. For life cycle events(ResourceAdded, 
>>>>>>>>>> ResourceRemoved, ResourceUpdated),  using D-Bus match, bmcweb 
>>>>>>>>>> can create an event log. This requires a JSON dictionary, 
>>>>>>>>>> comprising an array of Redfish Resource Name and the D-Bus 
>>>>>>>>>> path. This approach works only in case of one to one mapping 
>>>>>>>>>> of Redfish Resource Name and the D-Bus path. For 
>>>>>>>>>> propertiesChanged events, if the Redfish Resource property is 
>>>>>>>>>> not on the same D-Bus path or the Redfish Resource property 
>>>>>>>>>> name is different from the D-Bus property name, then an 
>>>>>>>>>> additional JSON dictionary to maintain this information is 
>>>>>>>>>> required. With D-Bus match alone in the bmcweb, Redfish 
>>>>>>>>>> EventService can't be fully supported. For the Message 
>>>>>>>>>> Registers and the Resource Types that are supported, the 
>>>>>>>>>> relevant OpenBMC application must create an event log in the 
>>>>>>>>>> journal using either the phosphor::logging::entry or 
>>>>>>>>>> sd_journal_send() command.
>>>>>>>>>> After realizing that with D-Bus match in the bmcweb alone 
>>>>>>>>>> can't help to fully implement EventService, I prefer to avoid 
>>>>>>>>>> using D-Bus match in bmcweb. Instead, I prefer to modify the 
>>>>>>>>>> OpenBMC application that generated the event to create an 
>>>>>>>>>> event log in the journal. Do you see any advantage of using 
>>>>>>>>>> combination of D-Bus match in the bmcweb wherever it is 
>>>>>>>>>> possible and changes to OpenBMC application in other cases to 
>>>>>>>>>> create an event log ?
>>>>>>>>>> Your views are highly appreciated.
>>>>>>>>>> Thanks,
>>>>>>>>>> Rajes
>>>>>>> Thanks
>>>>>>> Ratan
> Ratan
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