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  $ok = $bos->restart_bos;
  $ok = $bos->restart_all;
  $ok = $bos->stop(['vlserver']);

  my $restricted = $bos->getrestricted;
  $ok = $bos->setrestricted('on');

  $ok = $bos->create('kaserver', 'simple', ['/usr/afs/bin/kaserver']);
  $ok = $bos->delete('instance');

  $ok = $bos->exec('/sbin/shutdown -r now');

  my @logentries = $bos->getlog('FileLog');

  my ($all, $bak, $old, $core) = (0, 0, 0, 1);
  $ok = $bos->prune($all, $bak, $old, $core);

  $ok = $bos->salvage('/vicepa');

  $ok = $bos->setauth('on');

  $ok = $bos->setcellname('newcell.example.com');

=head1 DESCRIPTION

This class is used to communicate with a B<AFS Basic Overseer Server>,
which runs on every AFS server machine. It monitors and administers
the other server processes on that machine.  It has also methods to
maintain system configuration files.

Before you can submit any tasks to a Basic OverSeer (BOS) Server you
must establish a connection to a BOS Server.  This is done by the
constructor method I<new> which returns a BOS object.  A BOS object is
essentially a handle to talk to a Basic OverSeer Server on a given
server machine.  Such a BOS object is required before any of the other
BOS instance methods can be called.

=head1 COMPATIBILITY

There was no version 1 implementation and hence there are no version
conflicts :-)

=head1 METHODS

=over 4

=item B<CONSTRUCTOR>

=item S< >

=item B<$bos = AFS::BOS-E<gt>new(SERVER [, NOAUTH [, LOCALAUTH [, CELL [, ENCRYPT]]]]);>

Creates a new object of the class AFS::BOS and establishes a
connection to the Basic Overseer Server running on the SERVER machine.
An AFS::BOS object is essentially a handle to talk to the Basic
Overseer Server.  Internally an AFS::BOS object is a pointer to a
rx_connection structure, although this may change and the value
returned from AFS::BOS::new should always be treaded as an opaque
handle.

Set LOCALAUTH (default 0) to 1 only when issuing a command on a server
machine.  If NOAUTH is 1 (default 0) it establishes an unauthenticated
connection to the server, in which the server treats the issuer as an
unprivileged user.  CELL (default NULL) specifies the cell in which to
run the command.  Set ENCRYPT (default 1) to 0 if you want to use an
unencrypted connection. HANDLE WITH CARE!

=item B<DESTRUCTOR>

=item S< >

=item B<$bos-E<gt>DESTROY;>

Destroys the connection to the Basic Overseer Server and frees the
rx_connection structure.

=item B<INSTANCE METHODS>

=item S< >

=item B<$ok = $bos-E<gt>addhost(HOST [, CLONE]);>

=item B<$ok = $bos-E<gt>addhost(\@HOST [, CLONE]);>

Adds the given HOST to the local C<CellServDB> file.  HOST is either a
scalar value or a reference to an array of hosts.  If CLONE is set to
1 (default 0) the ubik vote of this host does not count.  This
argument is only available under OpenAFS.  It calls the AFS system
library function I<BOZO_AddCellHost>.

=item B<$ok = $bos-E<gt>addkey(KVNO [, STRING]);>

B<NOT YET RELEASED>

Constructs a server encryption key from the text STRING provided,
assigns it the key version number KVNO, and adds it to the local
C<KeyFile> file.  If STRING is omitted, the BOS Server prompts for the
string and does not echo it visibly.  It calls the AFS system library
function I<BOZO_AddKey>.

=item B<$ok = $bos-E<gt>adduser(USER);>

=item B<$ok = $bos-E<gt>adduser(\@USER);>

Adds the given USER to the list of privileged users in the local
C<UserList> file.  USER is either a scalar value or a reference to an
array of names.  It calls the AFS system library function
I<BOZO_AddSUser>.

=item B<$ok = $bos-E<gt>create(PROCESS, TYPE, COMMAND [, NOTIFIER]);>

=item B<$ok = $bos-E<gt>create(PROCESS, TYPE, \@COMMAND [, NOTIFIER]);>

Creates a server PROCESS entry in the local C<BosConfig> file on the
server machine, sets the process's status to I<Run> in the
C<BosConfig> file and in memory, and starts the process.  TYPE
specifies the process's type. Acceptable values are: 'simple', 'cron',
and 'fs'.  COMMAND is either a scalar value or an array reference
containing the commands the BOS Server should run to start the
process.  NOTIFIER specifies the complete pathname of a program that
the BOS Server invokes when the process terminates.  It calls the AFS
system library function I<BOZO_CreateBnode>.

=item B<$ok = $bos-E<gt>delete(INSTANCE);>

=item B<$ok = $bos-E<gt>delete(\@INSTANCE);>

Deletes the entry INSTANCE from the local C<BosConfig> file.  INSTANCE
is either a scalar value or a reference to an array of instance names.

Before using this method, issue the stop method to stop the process
and set its status flag in the BosConfig file to NotRun. The delete
method fails with an error message if a process's status flag is Run.
It calls the AFS system library function I<BOZO_DeleteBnode>.

=item B<$ok = $bos-E<gt>exec(COMMAND);>

Executes the indicated COMMAND on the BOS server machine.  It calls
the AFS system library function I<BOZO_Exec>.

=item B<@logfile = $bos-E<gt>getlog(LOGFILE);>

Returns an array with the contents of the specified LOGFILE from the
BOS server.  It calls the AFS system library function
I<StartBOZO_GetLog>.

=item B<($GTIME, $BTIME) = $bos-E<gt>getrestart;>

Returns the restart times GTIME and BTIME from the local C<BosConfig>
file.  GTIME is the general restart time at which the BOS Server
process automatically restarts itself.  BTIME is the binary restart
time at which the BOS Server automatically restarts any process for
which the time stamp on the binary file in the local C</usr/afs/bin>
directory is later than the last restart time for the process.  It
calls the AFS system library function I<BOZO_GetRestartTime>.

=item B<$restricted = $bos-E<gt>getrestricted;>

Returns the current I<restricted mode> of the BOS server. Return value
1 means I<restriced mode> enabled, 0 means disabled. This method is
only available under OpenAFS if the AFS system libraries were compiled
with the I<Restricted Mode Option>.  It calls the AFS system library
function I<BOZO_GetRestrictedMode>.

=item B<($CELL, $HOSTS) = $bos-E<gt>listhosts;>

Returns the name of the CELL and an array reference HOSTS
containing the list of database server machines.  It calls the AFS
system library function I<BOZO_Listhost>.

You can find an example how to print the entire content of the array
reference C<$HOSTS> in the C<examples/v2/bos> directory.

=item B<my($DATE, $KEYS) = $bos-E<gt>listkeys([SHOW]);>

Returns the DATE when a key was last added to the local C<KeyFile>
file and the hash reference KEYS containing the server encryption keys.
The hash keys are the key version numbers.  Set SHOW to 1 (default
0) to see the octal digits that constitute each key.  It calls the AFS