SYNOPSIS

ionadmin [ commands_filename | . ]

DESCRIPTION

ionadmin configures, starts, manages, and stops the ION node on the local computer.

It configures the node and sets (and reports on) global operational settings for the DTN protocol stack on the local computer in response to ION configuration commands found in commands_filename, if provided; if not, ionadmin prints a simple prompt (:) so that the user may type commands directly into standard input. If commands_filename is a period (.), the effect is the same as if a command file containing the single command 'x' were passed to ionadmin --- that is, the ION node's rfxclock task is stopped.

The format of commands for commands_filename can be queried from ionadmin by entering the command 'h' or '?' at the prompt. The commands are documented in ionrc(5).

Note that ionadmin always computes a congestion forecast immediately before exiting. The result of this forecast --- maximum projected occupancy of the DTN protocol traffic allocation in ION's SDR database --- is retained for application flow control purposes: if maximum projected occupancy is the entire protocol traffic allocation, then a message to this effect is logged and no new bundle origination by any application will be accepted until a subsequent forecast that predicts no congestion is computed. (Congestion forecasts are constrained by horizon times, which can be established by commands issued to ionadmin. One way to re-enable data origination temporarily while long-term traffic imbalances are being addressed is to declare a congestion forecast horizon in the near future, before congestion would occur if no adjustments were made.)

EXAMPLES

ionadmin

Enter interactive ION configuration command entry mode.

ionadmin host1.ion

Execute all configuration commands in host1.ion, then terminate immediately.

FILES

Status and diagnostic messages from ionadmin and from other software that utilizes the ION node are nominally written to a log file in the current working directory within which ionadmin was run. The log file is typically named ion.log.

See also ionconfig(5) and ionrc(5).

DIAGNOSTICS

Note: all ION administration utilities expect source file input to be lines of ASCII text that are NL-delimited. If you edit the ionrc file on a Windows machine, be sure to use dos2unix to convert it to Unix text format before presenting it to ionadmin. Otherwise ionadmin will detect syntax errors and will not function satisfactorily.

The following diagnostics may be issued to the log file:

Can't open command file...

The commands_filename specified in the command line doesn't exist.

ionadmin SDR definition failed.

A node initialization command was executed, but an SDR database already exists for the indicated node. It is likely that an ION node is already running on this computer or that destruction of a previously started the previous ION node was incomplete. For most ION installations, incomplete node destruction can be repaired by (a) killing all ION processes that are still running and then (b) using ipcrm to remove all SVr4 IPC objects owned by ION.

ionadmin can't get SDR parms.

A node initialization command was executed, but the ion_config_filename passed to that command contains improperly formatted commands. Please see ionconfig(5) for further details.

Various errors that don't cause ionadmin to fail but are noted in the log file may be caused by improperly formatted commands given at the prompt or in the commands_filename. Please see ionrc(5) for details.