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== Running OsmoHLR

The OsmoHLR executable (`osmo-hlr`) offers the following command-line
arguments:

=== SYNOPSIS

*osmo-hlr* [-h|-V] [-d 'DBGMASK'] [-D] [-c 'CONFIGFILE'] [-s] [-T] [-e 'LOGLEVEL'] [-l 'DATABASE']

=== OPTIONS

*-h, --help*::
	Print a short help message about the supported options
*-V, --version*::
	Print the compile-time version number of the OsmoBTS program
*-d, --debug 'DBGMASK','DBGLEVELS'*::
	Set the log subsystems and levels for logging to stderr. This
	has mostly been superseded by VTY-based logging configuration,
	see <<logging>> for further information.
*-D, --daemonize*::
	Fork the process as a daemon into background.
*-c, --config-file 'CONFIGFILE'*::
	Specify the file and path name of the configuration file to be
	used. If none is specified, use `osmo-hlr.cfg` in the current
	working directory.
*-s, --disable-color*::
	Disable colors for logging to stderr. This has mostly been
	deprecated by VTY based logging configuration, see <<logging>>
	for more information.
*-T, --timestamp*::
	Enable time-stamping of log messages to stderr. This has mostly
	been deprecated by VTY based logging configuration, see
	<<logging>> for more information.
*-e, --log-level 'LOGLEVEL'*::
	Set the global log level for logging to stderr. This has mostly
	been deprecated by VTY based logging configuration, see
	<<logging>> for more information.
*-l, --database 'DATABASE'*::
	Specify the file name of the SQLite3 database to use as HLR/AUC
	storage

=== Bootstrap the Database

If no database exists yet, OsmoHLR will automatically create and bootstrap a
database file with empty tables. If no `-l` command-line option is provided,
this database file will be created in the current working directory.

Alternatively, you may use the `osmo-hlr-db-tool`, which is installed along
with `osmo-hlr`, to bootstrap an empty database, or to migrate subscriber data
from an old 'OsmoNITB' database. See `osmo-hlr-db-tool --help`.

=== Multiple instances

Running multiple instances of `osmo-hlr` on the same computer is possible if
all interfaces (VTY, CTRL) are separated using the appropriate configuration
options. The IP based interfaces are binding to local host by default. In order
to separate the processes, the user has to bind those services to specific but
different IP addresses and/or ports.

The VTY and the Control interface can be bound to IP addresses from the loopback
address range, for example:

----
line vty
 bind 127.0.0.2
ctrl
 bind 127.0.0.2
----

The GSUP interface can be bound to a specific IP address by the following
configuration options:

----
hlr
 gsup
  bind ip 10.23.42.1
----

NOTE: At the time of writing, OsmoHLR lacks a config option to change the GSUP
port, which is by default TCP port 4222.