apt-cacher-ng(8) caching proxy for software package downloads


apt-cacher-ng [-c confdir] [-h] [optname=optvalue ...]


Apt-Cacher NG is a caching proxy for software packages which are downloaded by Unix/Linux system distribution mechanisms from mirror servers accessible via HTTP.


The command-line options supported by apt-cacher-ng are:

-c confdir
Scan the specified configuration directory and interpret configuration files find there.
Short option summary
The options from the configuration can be passed on the command line as key=value pairs.


Apt-Cacher NG is configured by a multi-config directory, i.e. the configuration is split into many configuration files having names with suffix .conf and stored in a single directory. Variables can override previously configured settings from other files, sometimes that settings are merged (depending on the variable).

The configuration directory is typically /etc/apt-cacher-ng but it can be adjusted with the -C option (see systemd service file for details or wherever the init system starts the daemon).

On Debian systems, there are at least three files installed by default: acng.conf (containing documented examples), security.conf (containing sensible data and only readable for special users) and zz_debconf.conf (containing popular settings which are set by the Debian Configuration mechanism).


Only few signals are handled in non-default ways.

SIGUSR1 closes and reopens log files.

SIGTERM and SIGINT close log files and stop the daemon.


For more information on Apt-Cacher NG, read the User Manual which can be found either in the doc/pdf directory of the software source package or installed in the documentation directory of apt-cacher-ng by your distribution.