Host console logs service

[Sai Dasari]

On 10/24/18, 8:56 AM, "openbmc on behalf of Artem Senichev" <openbmc-bounces+sdasari=fb.com at lists.ozlabs.org on behalf of artemsen at gmail.com> wrote:

    Hi All,
    
    As you know, OpenBMC contains obmc-console project that intended to
    work with host's console. It's very useful that omc-console-server
    stores last logs inside its ring buffer, but it would be better to
    make the log collector more smarter.
    
    On our VESNIN server, we have an own extension of obmc-console - it is
    a standalone service that reads log messages from obmc-console-server,
    marks each message with a timestamp and save it to an internal memory
    buffer. We have a custom policy that determines how large a buffer can
    be (limit by time or message numbers), in which cases the buffer
    should be flushed to a file, and how many previous log files can be
    saved on a flash drive (some kind of rotation).
    By default the buffer has limit of 3000 messages and it flushed to a
    file on every significant host state change (host on/off, OS boot
    complete). This gives us the opportunity to store not only the latest
    messages, but also the logs of the last boot process separately
    (hostboot, skiboot, etc).
    
    So, if you find this service useful for the OpenBMC project, we can
    upload the source code to the community.
Thanks Artem! Based on the description above, it looks like very useful feature. Few questions related to design are: Is this stand-alone service designed as a D-Bus service? How does this change the existing user interface with obmc-console i.e. any new CLI options change or behavior change? Can this be used from REST-API or Redfish? How to configure the custom policy to configure? Etc. It would be great if you could use the Design template @ https://github.com/openbmc/docs/tree/master/designs to explain the design details for helping in understanding and providing feedback.
   
    Sources:
    https://github.com/YADRO-KNS/phosphor-hostlogger
    
    Small demo:
    # ls -lA /var/lib/obmc/hostlogs
    -rw-r--r--    1 root     root          6336 Oct 24 09:26
    host_20181024_092655.log.gz
    -rw-r--r--    1 root     root          9589 Oct 24 11:43
    host_20181024_114342.log.gz
    -rw-r--r--    1 root     root          6547 Oct 24 12:01
    host_20181024_120119.log.gz
    # zcat /var/lib/obmc/hostlogs/host_20181024_120119.log.gz
    [ 11:55:02 ]: >>> Log collection started at 24.10.2018 11:55:02
    [ 11:55:02 ]: --== Welcome to Hostboot v2.1-199-g38a9f30-dirty/hbicore.bin/ ==--
    [ 11:55:06 ]:   5.66868|ISTEP  6. 3 - host_init_fsi
    [ 11:55:06 ]:   6.27102|ISTEP  6. 4 - host_set_ipl_parms
    [ 11:55:06 ]:   6.27234|ISTEP  6. 5 - host_discover_targets
    ...
    
    Best regards,
    Artem Senichev
    Software Engineer, YADRO.