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<p class="MsoPlainText"><span lang="EN-US">Hi Nan,<o:p></o:p></span></p>
<p class="MsoPlainText" style="text-indent:12.0pt"><span lang="EN-US">Thank you for the announcement, and here is a little feedback for the introduction.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Hope it will be helpful to you.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">On Mon, Mar 08, 2021 at 01:45:00PM -0800, Nan Zhou wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> We found there are some improvements as listed below,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Logs are not exposed to Redfish until they reach BUF_MAXSIZE or BUF_MAXTIME
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> (defined in https://github.com/openbmc/phosphor-hostlogger), but we want
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> to achieve a stream-like console. We could set BUF_MAXSIZE to 1 or BUF_MAXTIME<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> to a very short interval, but it will amplify the overhead of compression and
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> decompression.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Just remind that hostlogger message can manual flush by trigger signal SIGUSR1.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Persistence isn</span><span lang="EN-US" style="font-family:"Courier New"">¡¦</span><span lang="EN-US">t optional. phosphor-hostlogger doesn</span><span lang="EN-US" style="font-family:"Courier New"">¡¦</span><span lang="EN-US">t
expose any IPC interface. <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> bmcweb can only talk to phosphor-hostlogger via zip files, which makes persistence of logs a necessary condition.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Method 1: *D-Bus Signal*; phosphor-hostlogger implements an interface<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> which contains a signal. The payload of the signal should contain<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> timestamps and log messages. BmcWeb registers as a listener and once it<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> receives a signal, it populates a new LogEntry. BmcWeb should implement its<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> own configurable ring buffer to store log entries received from D-Bus.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">I think this method can be covered by phosphor-hostlogger if we using SIGUSR1 to trigger the message.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">But the performance will be a problem.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Method 2: *File Watcher*; add file watchers in BmcWeb to monitor the<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> log files produced by phosphor-hostlogger. This method is similar to method<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> 1. But persistence is still a necessary condition.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Method 3: *obmc-console + bmcweb*: install the console collection and<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> ring buffer parts of phosphor-hostlogger as a library. Use the library<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> directly in BmcWeb to collect console logs.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">I prefer to this method, but how to implement the phosphor-hostlogger as a library and install into the existing bmcweb may be a problem.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> - Method 4: *phosphor-hostlogger + journal + rsyslog + bmcweb*: this<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> architecture is very similar to what the current OpenBMC uses for<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> redfish-event<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> <<a href="https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fopenbmc%2Fdocs%2Fblob%2Fmaster%2Farchitecture%2Fredfish-logging-in-bmcweb.md&data=04%7C01%7CSpencer.Ku%40quantatw.com%7Cb9cdaaa48d1d4d20771208d8e307e0a5%7C179b032707fc4973ac738de7313561b2%7C1%7C0%7C637508970271861045%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7RwG8tjsFT5NHT6KhdxRcPi6jNJqi7LLV3QuaeoMpd8%3D&reserved=0">https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fopenbmc%2Fdocs%2Fblob%2Fmaster%2Farchitecture%2Fredfish-logging-in-bmcweb.md&data=04%7C01%7CSpencer.Ku%40quantatw.com%7Cb9cdaaa48d1d4d20771208d8e307e0a5%7C179b032707fc4973ac738de7313561b2%7C1%7C0%7C637508970271861045%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7RwG8tjsFT5NHT6KhdxRcPi6jNJqi7LLV3QuaeoMpd8%3D&reserved=0</a>>.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> Add a new schema for log entries. Publish journal logs in<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> phosphor-hostlogger. Add file watchers in BmcWeb to monitor the log files<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> produced by rsyslog. rsyslog should have log rotation enabled. Persistence<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">> is still a necessary condition.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Sincerely,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Spencer Ku<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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