htcacheclean(8) - Clean up the disk cache

[giraffelife]

HTCACHECLEAN(8) 		 htcacheclean		       HTCACHECLEAN(8)



NAME
       htcacheclean - Clean up the disk cache


SYNOPSIS
       htcacheclean [ -D ] [ -v ] [ -t ] [ -r ] [ -n ] [ -Rround ] -ppath
       [-llimit| -Llimit]


       htcacheclean [ -n ] [ -t ] [ -i ] [ -Ppidfile ] [ -Rround ] -dinterval
       -ppath [-llimit| -Llimit]


       htcacheclean [ -v ] [ -Rround ] -ppath [ -a ] [ -A ]


       htcacheclean [ -D ] [ -v ] [ -t ] [ -Rround ] -ppath url



SUMMARY
       htcacheclean is used to keep the size of mod_cache_disk's storage
       within a given size limit, or limit on inodes in use. This tool can run
       either manually or in daemon mode. When running in daemon mode, it
       sleeps in the background and checks the cache directory at regular
       intervals for cached content to be removed. You can stop the daemon
       cleanly by sending it a TERM or INT signal. When run manually, a once
       off check of the cache directory is made for cached content to be
       removed. If one or more URLs are specified, each URL will be deleted
       from the cache, if present.



OPTIONS
       -dinterval
	      Daemonize and repeat cache cleaning every interval minutes. This
	      option is mutually exclusive with the -D, -v and -r options. To
	      shutdown the daemon cleanly, just send it a SIGTERM or SIGINT.

       -D     Do a dry run and don't delete anything. This option is mutually
	      exclusive with the -d option. When doing a dry run and deleting
	      directories with -t, the inodes reported deleted in the stats
	      cannot take into account the directories deleted, and will be
	      marked as an estimate.

       -v     Be verbose and print statistics. This option is mutually
	      exclusive with the -d option.

       -r     Clean thoroughly. This assumes that the Apache web server is not
	      running (otherwise you may get garbage in the cache). This
	      option is mutually exclusive with the -d option and implies the
	      -t option.

       -n     Be nice. This causes slower processing in favour of other
	      processes. htcacheclean will sleep from time to time so that (a)
	      the disk IO will be delayed and (b) the kernel can schedule
	      other processes in the meantime.

       -t     Delete all empty directories. By default only cache files are
	      removed, however with some configurations the large number of
	      directories created may require attention. If your configuration
	      requires a very large number of directories, to the point that
	      inode or file allocation table exhaustion may become an issue,
	      use of this option is advised.

       -ppath Specify path as the root directory of the disk cache. This
	      should be the same value as specified with the CacheRoot
	      directive.

       -Ppidfile
	      Specify pidfile as the name of the file to write the process ID
	      to when daemonized.

       -Rround
	      Specify round as the amount to round sizes up to, to compensate
	      for disk block sizes. Set to the block size of the cache
	      partition.

       -llimit
	      Specify limit as the total disk cache size limit. The value is
	      expressed in bytes by default (or attaching B to the number).
	      Attach K for Kbytes or M for MBytes.

       -Llimit
	      Specify limit as the total disk cache inode limit.

       -i     Be intelligent and run only when there was a modification of the
	      disk cache. This option is only possible together with the -d
	      option.

       -a     List the URLs currently stored in the cache. Variants of the
	      same URL will be listed once for each variant.

       -A     List the URLs currently stored in the cache, along with their
	      attributes in the following order: url, header size, body size,
	      status, entity version, date, expiry, request time, response
	      time, body present, head request.


DELETING A SPECIFIC URL
       If htcacheclean is passed one or more URLs, each URL will be deleted
       from the cache. If multiple variants of an URL exists, all variants
       would be deleted.


       When a reverse proxied URL is to be deleted, the effective URL is
       constructed from the Host header, the port, the path and the query.
       Note the '?' in the URL must always be specified explicitly, whether a
       query string is present or not. For example, an attempt to delete the
       path / from the server localhost, the URL to delete would be
       http://localhost:80/?.


LISTING URLS IN THE CACHE
       By passing the -a or -A options to htcacheclean, the URLs within the
       cache will be listed as they are found, one URL per line. The -A option
       dumps the full cache entry after the URL, with fields in the following
       order:



       url    The URL of the entry.

       header size
	      The size of the header in bytes.

       body size
	      The size of the body in bytes.

       status Status of the cached response.

       entity version
	      The number of times this entry has been revalidated without
	      being deleted.

       date   Date of the response.

       expiry Expiry date of the response.

       request time
	      Time of the start of the request.

       response time
	      Time of the end of the request.

       body present
	      If 0, no body is stored with this request, 1 otherwise.

       head request
	      If 1, the entry contains a cached HEAD request with no body, 0
	      otherwise.


EXIT STATUS
       htcacheclean returns a zero status ("true") if all operations were
       successful, 1 otherwise. If an URL is specified, and the URL was cached
       and successfully removed, 0 is returned, 2 otherwise. If an error
       occurred during URL removal, 1 is returned.




Apache HTTP Server		  2010-11-20		       HTCACHECLEAN(8)