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 exclu-
sive 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 pro-
cesses. 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 direc-
tive.
-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 parti-
tion.
-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, M for MBytes or G for Gbytes.
-Llimit
Specify limit as the total disk cache inode limit. K, M or G
suffix can also be used.
-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 con-
structed 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://local-
host: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 suc-
cessful, 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 2019-08-09 htcacheclean(8)
apache 2.4.41 - Generated Sat Aug 17 12:58:10 CDT 2019