BOSCONFIG(5)							AFS File Reference						      BOSCONFIG(5)

NAME

       BosConfig - Defines server processes for the BOS Server to monitor

DESCRIPTION

       The BosConfig file lists the processes that the Basic OverSeer (BOS) Server monitors on its server machine, and thus defines which AFS
       server processes run on the machine. It specifies how the BOS Server reacts when a process fails, and also defines the times at which the
       BOS Server automatically restarts processes as part of performance maintenance.	The file must reside in the /var/lib/openafs/local
       directory on each AFS server machine.

       A server process entry in the BosConfig file records the following information:

       o   The entry type, which is one of the following:

	   cron
	       Designates a server process that runs periodically instead of continuously. The BOS Server starts a cron process only at specified
	       times, not whenever it fails. All standard AFS process entries except "fs" are simple (there are no standard cron processes).

	   fs  Designates a group of interdependent server processes. If one of the processes fails, the BOS Server must coordinate its restart
	       with the restart of the other processes in the group, possibly by stopping them first.

	       There is only one standard entry of this type, for which the conventional name is "fs". It combines three server processes: the
	       File Server (fileserver process), the Volume Server (volserver process), and the Salvager (salvager process). These processes all
	       operate on the same data--the AFS data stored on an AFS server machine's /vicep partitions and mounted in the AFS filespace--but in
	       different ways. Grouping the processes prevents them from attempting to access the same data simultaneously, which can cause
	       corruption.

	       During normal operation, the Salvager process is not active. If the File Server process fails, however, the BOS Server stops the
	       Volume Server process and runs the Salvager process to correct any corruption that resulted from the failure. (The administrator
	       can also issue the bos salvage command to invoke the Salvager process.) If the Volume Server fails, the BOS Server can restart it
	       without stopping the File Server or running the Salvager.

	   simple
	       Designates a server process that runs independently of any other on the server machine. If a simple process fails, the BOS Server
	       does not have to coordinate its restart with any other process.

       o   The entry name. The conventional name for an entry in the BosConfig file and the associated process matches the binary filename. When
	   issuing any bos command that takes the -instance argument, identify each process by the name used in the BosConfig file. For a list of
	   the names, see the bos create reference page.

       o   The process's status flag, which determines whether the BOS Server attempts to start the process in two cases: each time the BOS Server
	   itself restarts, and when the process fails. The BosConfig file currently uses a binary notation to indicate whether the BOS Server
	   attempts to restart the process as necessary or does not monitor it at all. For the sake of clarity, the AFS documentation refers to
	   the flags as "Run" and "NotRun" instead.  Only a system administrator, not the BOS Server, can change the flag.

       o   One or more command parameters which the BOS Server invokes to start the process or processes associated with the entry:

	   o   A "cron" entry has two command parameters, the first the complete pathname to the program, and the second the time at which the BOS
	       Server invokes the program.

	   o   The "fs" entry has three command parameters, each the complete pathname to the fileserver, volserver, and salvager programs, in
	       that order.

	   o   A "simple" entry has only one command parameter, the complete pathname to the program.

       In addition to server process entries, the BosConfig file specifies the times at which the BOS Server performs two types of automatic
       process restarts:

       o   The general restart time at which the BOS Server restarts itself and then each process for which the entry in the BosConfig file has
	   status flag "Run". The default setting is Sunday at 4:00 a.m.

       o   The binary restart time at which the BOS Server restarts any server process for which the time stamp on the binary file in the
	   /usr/lib/openafs directory is later than the last restart time for the process. The default is 5:00 a.m.

       Although the BosConfig file is in ASCII format, it is normally best not to use a text editor to alter it.  The parser is very picky, and
       incorrectly formatted entries can prevent server startup in ways that are difficult to diagnose. Instead, use the appropriate commands from
       the bos command suite:

       o   The bos create command to create an entry in the file and start the associated process.

       o   The bos delete command to remove an entry from the file after the bos stop command is used to stop the associated process.

       o   The bos getrestart command to display the times at which the BOS Server performs automatic restarts.

       o   The bos setrestart command to set the times at which the BOS Server performs automatic process restarts.

       o   The bos start command to change an entry's status flag to "Run" and start the associated process.

       o   The bos status command to display all processes listed in the file.

       o   The bos stop command to change an entry's status flag to "NotRun" and stop the associated process.

       There are also bos commands that start and stop processes without changing entries in the BosConfig file. The BOS Server reads the
       BosConfig file only when it starts, transferring the information into its memory. Thus a process's status as represented in the BOS
       Server's memory can diverge from its status in the BosConfig file. The following commands change a process's status in the BOS Server's
       memory only:

       o   The bos restart command restarts a specified set of processes, all processes, or all processes other than the BOS Server.

       o   The bos shutdown command stops a process.

       o   The bos startup command starts a process.

       When the BOS Server shuts down, it rewrites BosConfig, discarding any changes made manually to that file.  To change the configuration for
       the next BOS Server restart, instead write a new file to BosConfig.new.	If BosConfig.new exists when the BOS Server starts, it will rename
       that file to BosConfig before reading its configuration.

SEE ALSO

       bos_create(8), bos_delete(8), bos_getrestart(8), bos_restart(8), bos_setrestart(8), bos_shutdown(8), bos_start(8), bos_startup(8),
       bos_status(8), bos_stop(8), bos_salvage(8), fileserver(8), salvager(8), volserver(8)

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD by software written by Chas
       Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.

OpenAFS 							    2012-03-26							      BOSCONFIG(5)