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The Journal - a proposed syslog replacementThe Journal - a proposed syslog replacementPosted Nov 19, 2011 17:57 UTC (Sat) by endecotp (guest, #36428)In reply to: The Journal - a proposed syslog replacement by PO8 Parent article: The Journal - a proposed syslog replacement
> I'm not sure requiring HW is a non-starter. It would
> have to be cheap---say $20 or less---to start with.
Here's an idea that I had a while ago: make a USB dongle that appears to be a USB-to-serial converter. Data that is sent to it is recorded in its flash; you configure your system to send log messages to it like a serial console.
My aim was to have a "dying breath" log for machines where networked logging wasn't feasible, e.g. a single co-located server. The idea is that if there is a kernel panic and the critical last log messages don't make it to the disk, they might still make it to this device. You could then re-mount it, potentially on another machine, where it would appear as a storage device containing the log files.
You could make this relatively secure by not allowing a transition from logging mode to read mode without re-plugging.
This could be implemented by a simplish microcontroller with USB device functionality. Maybe a bit more than a PIC, but not much more.
One thing that I was unsure of was how likely it would be that the host's USB system would keep running for long enough after a kernel crash. Perhaps a real serial device, or a console video recorder, would work in more cases. This device would be rather pointless if it were no more reliable than the disk.
Anyway, just a tangential thought for you all...
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There are already such devices on the market... Posted Nov 20, 2011 8:04 UTC (Sun) by khim (subscriber, #9252) [Link] What you are describing looks awfully close to the "P33 JailBreak dongle". PS3 Jailbreak works by overflowing receiving buffer in the PS3 so it needs to emulate four or five (depending on Jailbreak payload) USB devices, return bogus information with jailbreak code, etc. Significantly more then what your "logging device" should do. These devices price is starting from about $10 retail and this is with tiny runs so not much of the "economy of scale". More expensive ones (in the aforementioned range of about $20) may even emulate USB stick to make use after successfull JailBreak more pleasant! In short: what you are describing looks perfectly doable.
The Journal - a proposed syslog replacement Posted Nov 23, 2011 22:42 UTC (Wed) by cas (subscriber, #52554) [Link] Here's an idea that I had a while ago: make a USB dongle that appears to be a USB-to-serial converter. Data that is sent to it is recorded in its flash; you configure your system to send log messages to it like a serial console. This bit of the idea is good You could make this relatively secure by not allowing a transition from logging mode to read mode without re-plugging. but this bit isn't. It would make more sense and be far more usable if the USB dongle presented two devices. The first device being a (perhaps serial) output device for writing log entries with maybe a control option for rotating log files by YYYYMMDD or whatever. each line sent to the device should have a "filename" (or syslog facility, or some other identifier) as the first word/field, with the remainder of the line being the log entry The second a *read-only* USB storage device for reading the logs whenever you like. so, the one device would provide write-once/append-only logging, and random read access to those logs such a device could be made dirt cheap, too. it's just a USB flash disk with a slightly more capable processor & USB interface
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