SEL Event logs in Redfish

[Bills, Jason M]

On 6/1/2021 7:32 PM, Lei Yu wrote:
> On Wed, Jun 2, 2021 at 3:05 AM Bills, Jason M
> <jason.m.bills at linux.intel.com> wrote:
>>
>>
>>
>> On 5/28/2021 1:58 AM, Jayashree D wrote:
>>> Classification: Public
>>>
>>> Hi Jason,
>>>
>>> In journalctl log, I found that the sensor value is crossed the threshold value.
>>> But when I tried in Redfish API, I am not able to see any logs, whether anything I am missing here ?
>>> Could you please provide suggestions on this .
>> Unfortunately, we ran into trouble trying to persist the journal to
>> flash, so we have one additional layer where rsyslog watches for any
>> journal entries that have a "REDFISH_MESSAGE_ID" metadata and logs them
>> to '/var/log/redfish' where bmcweb pulls them for the Redfish EventLog.
>>
>> https://github.com/openbmc/openbmc/blob/master/meta-intel-openbmc/meta-common/recipes-extended/rsyslog/rsyslog/rsyslog.conf#L66
>>
>> If you have the journal event, I'd check if you have 'var/log/redfish'
>> populated with that event.  If not, you may need to add the above config
>> to rsyslog to create it and that will hopefully fix the event in Redfish.
> 
> There is a limitation about the way to log SEL event to
> /var/log/redfish, that it only appears in redfish event logs, but not
> in ipmi sel.
When using journal-based logging, the IPMI sel events are in 
'/var/log/ipmi_sel'.
> 
> On g220a it still uses the logging service to represent the event log
> (see [1]), and ipmid is updated to consume the logging entries to get
> the SEL entries.
I would expect that the same logging approach would be used for both 
IPMI SEL and Redfish.  So, either both will use journal-based logging or 
both will use D-Bus logging. I don't know if it would work to mix them.

> The missing part is in bmcweb that it does not support the event log
> entries from DBus. We could probably add some new code to make it
> support consuming data from logging service, and it could be
> implemented under a config, so that the user could config which data
> source to get event log at compile time.
I believe that bmcweb supports Redfish event logs from D-Bus log entries 
with this option: 
https://github.com/openbmc/bmcweb/blob/master/meson_options.txt#L21.

> 
> [1]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/Logging/SEL.metadata.yaml
>