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Full Discussion: Gzip behavior on open files?
Top Forums Shell Programming and Scripting Gzip behavior on open files? Post 302800043 by dan-e on Sunday 28th of April 2013 09:51:51 PM
Old 04-28-2013
Quote:
Originally Posted by alister
The way this is typically done during logrotation is to rename the logfile, then send a signal to the logging process to inform it that it needs to close its file descriptor and create a new logfile, and finally, compress.

Another safe alternative, though more brutish, is to shut down the logging process during rotation.
Yes this is what I thought. The problem is that the logging process is basically a black box as far as I'm concerned. I don't know if it holds a file descriptor, or just keeps atomically opening-appending-closing the file, nor do I know if it would respond to signals. It's also not possible to shut down the logging process, for various reasons but mainly because the traffic is real-time and needs to be logged as such.

Looks like there's no way to do what I need without the logging process explicitly cooperating. I guess the next best approach would be to strip only data out of the capture which definitely appears in the gz after the archiving is complete. And that's something I have no clue how to do yet... stay tuned for another thread Smilie
 

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LEARN ABOUT MINIX

cachefslog

cachefslog(1M)						  System Administration Commands					    cachefslog(1M)

NAME

       cachefslog - Cache File System logging

SYNOPSIS

       cachefslog [-f logfile | -h]  cachefs_mount_point

DESCRIPTION

       The  cachefslog	command displays where CacheFS statistics are being logged. Optionally, it sets where CacheFS statistics are being logged,
       or it halts logging for a cache specified by cachefs_mount_point. The cachefs_mount_point argument is a mount point of a cache file system.
       All file systems cached under the same cache as cachefs_mount_point will be logged.

OPTIONS

       The following options are supported. You must be super-user to use the -f and -h options.

       -f logfile      Specify the log file to be used.

       -h	       Halt logging.

OPERANDS

       cachefs_mount_point     A mount point of a cache file system.

USAGE

       See largefile(5) for the description of the behavior of cachefslog when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXAMPLES

       Example 1: Checking the Logging of a directory.

       The example below checks if the directory /home/sam is being logged:

       example% cachefslog /home/sam
       not logged: /home/sam

       Example 2: Changing the logfile.

       The example below changes the logfile of  /home/sam to /var/tmp/samlog:

       example# cachefslog -f /var/tmp/samlog /home/sam
       /var/tmp/samlog: /home/sam

       Example 3: Verifying the change of a logfile.

       The example below verifies the change of the previous example:

       example% cachefslog /home/sam
       /var/tmp/samlog: /home/sam

       Example 4: Halting the logging of a directory.

       The example below halts logging for the /home/sam directory:

       example# cachefslog -h /home/sam
       not logged: /home/sam

EXIT STATUS

       The following exit values are returned:

       0	       success

       non-zero        an error has occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cachefsstat(1M), cachefswssize(1M), cfsadmin(1M), attributes(5), largefile(5)

DIAGNOSTICS

       Invalid path    It is illegal to specify a path within a cache file system.

SunOS 5.10							    7 Feb 1997							    cachefslog(1M)
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