DOKK / manpages / debian 10 / approx / approx.conf.5.en
APPROX.CONF(5) File Formats Manual APPROX.CONF(5)

approx.conf - configuration file for approx proxy server


Each non-blank line of the configuration file should contain a name/value pair, separated by white space. Comments start with a "#" character and continue to the end of the line.

Names that begin with the "$" character are reserved for use as configuration parameters. The following parameters are currently defined:

Specifies the location of the approx cache directory (default: /var/cache/approx). It and all its subdirectories must be owned by the approx server (see also the $user and $group parameters, below.)
Specifies the time in minutes after which a cached file will be considered too old to deliver without first checking with the remote repository for a newer version (default: 60)
Specifies the maximum download rate from remote repositories, in bytes per second (default: unlimited). The value may be suffixed with "K", "M", or "G" to indicate kilobytes, megabytes, or gigabytes per second, respectively.
Specifies the maximum number of HTTP redirections that will be followed when downloading a remote file (default: 5)
$user, $group
Specifies the user and group that owns the files in the approx cache (default: approx)
Specifies the syslog(3) facility to use when logging (default: daemon)
Specifies whether to support IndexFile diffs (default: true)
Specifies whether to deliver (possibly out-of-date) cached files when they cannot be downloaded from remote repositories (default: false)
Specifies how many seconds an approx(8) process will wait for a concurrent download of a file to complete, before attempting to download the file itself (default: 10)
Specifies the path to the curl binary (default: /usr/bin/curl)
Specifies whether informational messages should be printed in the log (default: false)
Specifies whether debugging messages should be printed in the log (default: false)

The other name/value pairs are used to map distribution names to remote repositories. For example,


The port on which approx(8) listens is not specified in this file, but in /etc/inetd.conf. The default value is 9999, for compatibility with apt-proxy(8), but it may be changed by running the command

dpkg-reconfigure approx

approx(8), approx-gc(8), inetd(8)

Eric Cooper <>

Apr 2012