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5dd137c474
Remove the conditional and Autoconf flag for enabling BosConfig.new handling and change bosserver to always rename BosConfig.new to BosConfig on startup if the former exists. Document BosConfig.new handling in the bosserver and BosConfig man pages. Tone down the warning about the BosConfig file format changing and warn that bosserver rewrites BosConfig when shutting down. Reviewed-on: http://gerrit.openafs.org/211 Reviewed-by: Derrick Brashear <shadow@dementia.org> Tested-by: Derrick Brashear <shadow@dementia.org>
231 lines
7.0 KiB
Plaintext
231 lines
7.0 KiB
Plaintext
=head1 NAME
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BosConfig - Defines server processes for the BOS Server to monitor
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=head1 DESCRIPTION
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The F<BosConfig> file lists the processes that the Basic OverSeer (BOS)
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Server monitors on its server machine, and thus defines which AFS server
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processes run on the machine. It specifies how the BOS Server reacts when
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a process fails, and also defines the times at which the BOS Server
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automatically restarts processes as part of performance maintenance. The
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file must reside in the F</usr/afs/local> directory on each AFS server
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machine.
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A server process entry in the F<BosConfig> file records the following
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information:
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=over 4
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=item *
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The I<entry type>, which is one of the following:
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=over 4
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=item cron
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Designates a server process that runs periodically instead of
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continuously. The BOS Server starts a cron process only at specified
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times, not whenever it fails. All standard AFS process entries except
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C<fs> are simple (there are no standard cron processes).
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=item fs
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Designates a group of interdependent server processes. If one of the
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processes fails, the BOS Server must coordinate its restart with the
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restart of the other processes in the group, possibly by stopping them
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first.
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There is only one standard entry of this type, for which the conventional
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name is C<fs>. It combines three server processes: the File Server
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(B<fileserver> process), the Volume Server (B<volserver> process), and the
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Salvager (B<salvager> process). These processes all operate on the same
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data--the AFS data stored on an AFS server machine's F</vicep> partitions
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and mounted in the AFS filespace--but in different ways. Grouping the
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processes prevents them from attempting to access the same data
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simultaneously, which can cause corruption.
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During normal operation, the Salvager process is not active. If the File
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Server process fails, however, the BOS Server stops the Volume Server
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process and runs the Salvager process to correct any corruption that
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resulted from the failure. (The administrator can also issue the B<bos
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salvage> command to invoke the Salvager process.) If the Volume Server
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fails, the BOS Server can restart it without stopping the File Server or
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running the Salvager.
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=item simple
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Designates a server process that runs independently of any other on the
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server machine. If a simple process fails, the BOS Server does not have to
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coordinate its restart with any other process.
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=back
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=item *
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The I<entry name>. The conventional name for an entry in the F<BosConfig>
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file and the associated process matches the binary filename. When issuing
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any B<bos> command that takes the B<-instance> argument, identify each
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process by the name used in the F<BosConfig> file. For a list of the
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names, see the B<bos create> reference page.
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=item *
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The process's I<status flag>, which determines whether the BOS Server
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attempts to start the process in two cases: each time the BOS Server
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itself restarts, and when the process fails. The F<BosConfig> file
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currently uses a binary notation to indicate whether the BOS Server
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attempts to restart the process as necessary or does not monitor it at
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all. For the sake of clarity, the AFS documentation refers to the flags as
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C<Run> and C<NotRun> instead. Only a system administrator, not the BOS
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Server, can change the flag.
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=item *
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One or more I<command parameters> which the BOS Server invokes to start
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the process or processes associated with the entry:
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=over 4
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=item *
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A C<cron> entry has two command parameters, the first the complete
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pathname to the program, and the second the time at which the BOS Server
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invokes the program.
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=item *
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The C<fs> entry has three command parameters, each the complete pathname
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to the B<fileserver>, B<volserver>, and B<salvager> programs, in that
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order.
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=item *
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A C<simple> entry has only one command parameter, the complete pathname to
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the program.
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=back
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=back
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In addition to server process entries, the F<BosConfig> file specifies the
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times at which the BOS Server performs two types of automatic process
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restarts:
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=over 4
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=item *
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The I<general restart> time at which the BOS Server restarts itself and
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then each process for which the entry in the F<BosConfig> file has status
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flag C<Run>. The default setting is Sunday at 4:00 a.m.
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=item *
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The I<binary restart> time at which the BOS Server restarts any server
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process for which the time stamp on the binary file in the F</usr/afs/bin>
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directory is later than the last restart time for the process. The default
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is 5:00 a.m.
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=back
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Although the F<BosConfig> file is in ASCII format, it is normally best not
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to use a text editor to alter it. The parser is very picky, and
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incorrectly formatted entries can prevent server startup in ways that are
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difficult to diagnose. Instead, use the appropriate commands from the
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B<bos> command suite:
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=over 4
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=item *
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The B<bos create> command to create an entry in the file and start the
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associated process.
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=item *
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The B<bos delete> command to remove an entry from the file after the B<bos
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stop> command is used to stop the associated process.
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=item *
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The B<bos getrestart> command to display the times at which the BOS Server
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performs automatic restarts.
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=item *
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The B<bos setrestart> command to set the times at which the BOS Server
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performs automatic process restarts.
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=item *
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The B<bos start> command to change an entry's status flag to C<Run> and
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start the associated process.
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=item *
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The B<bos status> command to display all processes listed in the file.
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=item *
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The B<bos stop> command to change an entry's status flag to C<NotRun> and
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stop the associated process.
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=back
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There are also bos commands that start and stop processes without changing
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entries in the F<BosConfig> file. The BOS Server reads the F<BosConfig>
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file only when it starts, transferring the information into its
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memory. Thus a process's status as represented in the BOS Server's memory
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can diverge from its status in the F<BosConfig> file. The following
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commands change a process's status in the BOS Server's memory only:
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=over 4
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=item *
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The B<bos restart> command restarts a specified set of processes, all
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processes, or all processes other than the BOS Server.
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=item *
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The B<bos shutdown> command stops a process.
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=item *
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The B<bos startup> command starts a process.
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=back
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When the BOS Server shuts down, it rewrites F<BosConfig>, discarding any
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changes made manually to that file. To change the configuration for the
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next BOS Server restart, instead write a new file to F<BosConfig.new>. If
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F<BosConfig.new> exists when the BOS Server starts, it will rename that
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file to F<BosConfig> before reading its configuration.
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=head1 SEE ALSO
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L<bos_create(8)>,
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L<bos_delete(8)>,
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L<bos_getrestart(8)>,
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L<bos_restart(8)>,
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L<bos_setrestart(8)>,
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L<bos_shutdown(8)>,
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L<bos_start(8)>,
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L<bos_startup(8)>,
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L<bos_status(8)>,
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L<bos_stop(8)>,
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L<bos_salvage(8)>,
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L<fileserver(8)>,
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L<salvager(8)>,
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L<volserver(8)>
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=head1 COPYRIGHT
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IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
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This documentation is covered by the IBM Public License Version 1.0. It was
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converted from HTML to POD by software written by Chas Williams and Russ
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Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
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