Understand OpenBMC Event logging mechanism for beginner

[Deepak Kodihalli]

On 28/11/18 5:18 PM, A, Maheswari wrote:
> Hi,
> 
> I found some OpenBMC document to understand LED Control architecture.
> 
> Document is very useful for beginner.
> 
> But There is no document to understand workflow of OpenBMC event 
> management for beginner.


Agree. I volunteer to write a document related to phosphor-logging.

> We need to understand BMC SEL logging mechanism in OpenBMC.


You should look at 
https://gerrit.openbmc-project.xyz/#/q/topic:%22IPMI+SEL%22. The high 
level idea is to log SEL related messages and metadata to the journal, 
and then have a deamon look at the journal to make a SEL repository.

>  1. BMC Need to log chassis intrusion SEL.
>  2. We need to log Event while Emergency Power OFF case . 
> 
> I hope below packages are concerns to record events.
> 
> Phosphor-logging   ( getting fan ReadFailure log in REST command 
> xyz.openproject.logging ).

phosphor-logging looks at journal metadata (placed in the journal via 
the log<>() or elog<>() APIs) and makes D-Bus objects to represent 
errors/events.

> Phosphor-event
> 
> Phosphor-dbus-monitor
> 
> obmc-event-mgmt is removed from stack.
> 
> Please clarify which recipes are needed to log events in BMC.
> 
> Please explain some basic understanding to log test event.
> 
> How do verify logged events .


If you're just interested in IPMI SELs, you should look at those reviews 
I posted above. Were you looking at something else though as the 
external interface - such as Redfish?

> Thanks
> 
> Maheswari A
> 

Regards,
Deepak