NAME

       apt-cacher-ng - caching proxy for software package downloads

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

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

       -c confdir
              Scan the specified configuration directory and interpret configuration files  found
              there.

       -h     Short option summary

       -i     Ignore  some  non-critical  configuration errors on startup. Regular operation with
              this switch is not recommended.

       -v     Enable additional verbosity in log output.

       -e     Invoke expiration task immediately after startup. This  option  exists  for  legacy
              compatibility and can be dangerous to use due to filesystem permission issues (i.e.
              danger to cause them).  Using  acngtool  to  control  such  operations  instead  is
              advisable.

       varname=varopt
              The  options  from the configuration can be passed on the command line as key=value
              pairs.

CONFIGURATION

       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 those 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).

SIGNALS

       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.

MORE INFORMATION

       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.