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.

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), apt-get(8), sources.list(5)

AUTHOR
Eric Cooper <ecc@cmu.edu>