[Buildroot] log storage strategy
arnout at mind.be
Thu Mar 5 22:08:18 UTC 2015
On 05/03/15 10:30, Sylvain LG wrote:
> many services like to write log files.
> I suppose that it could be a problem on an embedded device, since space is
> limited and NAND has write limitation in time.
> What is the correct strategy to deal with log?
There is no single strategy that will work for everybody.
Often the logs are put in a tmpfs so they are never committed to NAND. But then
of course you loose them when the system reboots.
If you do write to flash, with a decent wear-levelling filesystem the write
limit is not necessarily a problem, especially if you enable some write
buffering (which defaults to 5-30 secs anyway, cfr. sysctl
vm.dirty_writeback_centisecs and vm.dirty_expire_centisecs) and rate limiting
(rsyslogd and journald have controls for that).
And finally, you'll have to clean up old logs. You can use logrotate, or the
built-in rotation in rsyslogd and journald.
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
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