approx-gc(8) [centos man page]

APPROX-GC(8)						      System Manager's Manual						      APPROX-GC(8)

NAME

       approx-gc - garbage-collect the cache of Debian archive files

SYNOPSIS

       approx-gc [OPTION]...

DESCRIPTION

       approx-gc  scans  the  cache created by approx(8) and finds files that are corrupted or no longer needed.  With no options specified, these
       files are listed on standard output and removed from the cache.

       A corrupted file is one whose size or checksum does not match the value specified in the Packages or Sources file.

       An unneeded file is one that is not referenced from any distribution's Packages or Sources file.

       approx-gc may take several minutes to finish.

OPTIONS

       -c file, --config file
	      Specify an additional configuration file.  May be used multiple times.

       -f, --fast
	      Don't perform checksum validation.

       -k, --keep, -s, --simulate
	      Don't remove files from the cache.

       -q, --quiet
	      Don't print file names.

       -v, --verbose
	      Print the reason for removal of each file.

EXAMPLES

       To remove all unneeded or corrupted files from the cache:

	      approx-gc --quiet

       This is run as a weekly cron(8) job.

       To list the files that would be removed from the cache, without actually doing so:

	      approx-gc --keep

FILES

       /etc/approx/approx.conf
	      Configuration file for approx and related programs.

       /var/cache/approx
	      Default cache directory for archive files.

SEE ALSO

       approx.conf(5), approx(8), cron(8)

AUTHOR

       Eric Cooper <ecc@cmu.edu>

								     May 2011							      APPROX-GC(8)

APPROX(8)                                                     System Manager's Manual                                                    APPROX(8)

NAME

       approx - proxy server for Debian archive files

SYNOPSIS

       approx [OPTION]...

DESCRIPTION

       approx responds to HTTP requests made by apt-get(8).  It maintains a cache of Debian archive files that have been previously downloaded, so
       that it can respond with a local copy when possible.  If a file not in the cache is requested, approx will download it from a remote Debian
       repository and deliver the contents to the client, simultaneously caching it for future use.

       Over  time,  the approx server cache will grow to contain multiple, unneeded versions of Debian packages.  The approx-gc(8) program removes
       these from the cache.

OPTIONS

       -c file, --config file
              Specify an additional configuration file.  May be used multiple times.

USAGE

       approx is invoked by inetd(8).

EXAMPLES

       Suppose that a client machine's /etc/apt/sources.list file contains the following lines:

              deb     http://apt:9999/debian    testing main
              deb     http://apt:9999/security  testing/updates main
              deb-src http://apt:9999/debian    unstable main

       In this example, apt is the hostname of the approx server machine on the local network.  Each distribution, such as "debian" or "security",
       is mapped to a remote repository in the approx server's configuration file.

       For example, the approx.conf file on the approx server might contain the lines

              debian   http://ftp.debian.org/debian
              security http://security.debian.org

       The mapping scheme is very simple.  If the approx.conf file contains the line

              repository     http://remote-host/initial/path

       then any request to the approx server of the form

              http://approx-server/repository/rest/of/URL

       is rewritten to

              http://remote-host/initial/path/rest/of/URL

       when there is a "cache miss", and that file is cached as

              /var/cache/approx/repository/rest/of/URL

       (Note  that  the repository name on the left-hand side is not included in the rewritten URL unless it is explicitly mentioned in the right-
       hand side's initial path.)

FILES

       /etc/approx/approx.conf
              Configuration file for approx and related programs.

       /var/cache/approx
              Default cache directory for archive files.

SEE ALSO

       approx.conf(5), inetd(8), approx-import(8), approx-gc(8), apt-get(8), sources.list(5)

AUTHOR

       Eric Cooper <ecc@cmu.edu>

                                                                     May 2011                                                            APPROX(8)