Re: tmpfs

Hi Boris

Am 19.11.2024 um 22:47 schrieb Boris:
> Hej Erich,
> 
...

> aproximately 25 MB while being rotated (kept) 4 days.
> 
> So, if there are 36 MB logged (and compressed) in 4 days and the box ia 
> up for 10 days, we don't even reach the 121 MB from df .
> 
> Funny, isn't it?
> 
> With the uncompressed logs, df -h shows
> tmpfs                   800.0M    149.0M    651.0M  19% /var/log
> 
> For me it smells like tmpfs does not release former occupied storage 
> after logrotating.

I doubt this, in my case to clear the space a correct restart of the 
service was needed. If it was tmpfs which is widely used many people 
would have reported it and it would have been fixed in the code.

To me it feels like the logging daemon dispatches a separate process per 
file and if this process is not terminated correctly the file descriptor 
is kept alive and the file space is not passed back to file management.

> 
> And no - no SSD on my box. To be honest I forgot the details aof the 
> hardware. ;-) But I'm shure there is no SSD.
> 
> My habit ist to reboot the box when finding it on 100%.

Well right, this clears the memory storage.

what you can do is play with the LOGSIZE parameter. It determines if a 
log gets rotated and if I am not mistaken it is in KB. Then to watch 
what logrotate does you can always start it like

sh -x /usr/bin/logrotate

You will see that savelog is used to compress and rename the file

here is an excerpt from a testrun on my system for lighttpd

+ . /etc/logrotate.d/lighttpd
+ LOGS_DAILY='lighttpd/access.log lighttpd/error.log'
+ LOGS_WEEKLY=

Here we set the minimum size for a file to be rotated

+ LOGSIZE=1024
+ USER=sh-httpd
+ DAEMON=lighttpd
+ METHOD=restart
+ COMPRESS_ALL=1
+ LOGFILES='lighttpd/access.log lighttpd/error.log'
+ date '+%u'
+ DAY_OF_WEEK=2
+ date '+%d'
+ DAY_OF_MONTH=19
+ '[' 19 -eq 1 ]
+ '[' 2 -eq 7 ]
+ USER=sh-httpd
+ GROUP=adm
+ MODE=640
+ METHOD=restart
+ LOGDEPTH=4
+ LOGDIR=/var/log
+ COMPRESS_ALL=1
+ LOGSIZE=1024
+ SAVELOG=/usr/bin/savelog
+ '[' 1 '!=' 0 ]
+ SAVELOG='/usr/bin/savelog -a'
+ '[' 'lighttpd/access.log lighttpd/error.log' '!='  ]
+ cd /var/log
+ '[' -f lighttpd/access.log ]

looks like there is no access.log (which is true)

+ '[' -f lighttpd/error.log ]
+ du lighttpd/error.log
+ cut -f 1
+ set 8
+ '[' 1024 '=='  ]
+ '[' 8 -gt 1024 ]

Nothing happens because the error.log is too small

+ '[' lighttpd '!='  ]
+ /etc/init.d/lighttpd restart

the lighttpd service is started nevertheless.

+ '['  '!='  ]


Hope this helps

ET

-- 
„Wer von seinem Tag nicht zwei Drittel für sich hat, ist ein Sklave.“
―Friedrich Nietzsche



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