=head1 NAME

bos_create - Defines a new process in the BosConfig file and starts it

=head1 SYNOPSIS

=for html
<div class="synopsis">

B<bos create> S<<< B<-server> <I<machine name>> >>>
    S<<< B<-instance> <I<server process name>> >>> S<<< B<-type> <I<server type>> >>>
    S<<< B<-cmd> <I<command lines>>+ >>> S<<< [B<-notifier> <I<notifier program>>] >>>
    S<<< [B<-cell> <I<cell name>>] >>> [B<-noauth>] [B<-localauth>] [B<-help>]

B<bos c> S<<< B<-s> <I<machine name>> >>> S<<< B<-i> <I<server process name>> >>>
    S<<< B<-t> <I<server type>> >>> S<<< B<-cm> <I<command lines>>+ >>>
    S<<< [B<-not> <I<notifier program>>] >>> S<<< [B<-ce> <I<cell name>>] >>> [B<-noa>]
    [B<-l>] [B<-h>]

=for html
</div>

=head1 DESCRIPTION

The B<bos create> command creates a server process entry in the
F</usr/afs/local/BosConfig> file on the server machine named by the
B<-server> argument, sets the process's status to C<Run> in the
F<BosConfig> file and in memory, and starts the process.

A server process's entry in the F<BosConfig> file defines its name, its
type, the command that initializes it, and optionally, the name of a
notifier program that runs when the process terminates.

=head1 CAUTIONS

A server process entry of type B<fs> as described below will not work with
a demand-attach File Server, and a server process entry of type B<dafs>
for a demand-attach File Server will not work with a traditional File
Server. When switching from one File Server implementation to another,
remove the existing server process entry and create a new one. See
L</EXAMPLES> below for an example of switching from a traditional File
Server to a demand-attach File Server.

=head1 OPTIONS

=over 4

=item B<-server> <I<machine name>>

Indicates the server machine on which to define and start the new
process. Identify the machine by IP address or its host name (either
fully-qualified or abbreviated unambiguously). For details, see L<bos(8)>.

=item B<-instance> <I<server process name>>

Names the process to define and start. Any name is acceptable, but for the
sake of simplicity it is best to use the last element of the process's
binary file pathname (or the instance type for B<fs> and B<dafs>), and to
use the same name on every server machine. The conventional names, as used
in all AFS documentation, are:

=over 4

=item buserver

The Backup Server process.

=item dafs

The process that combines the Demand Attach File Server, Volume Server, 
Salvageserver and Salvager processes (B<dafileserver>, B<davolserver>,
B<salvageserver>, and B<dasalvager>).

=item fs

The process that combines the File Server, Volume Server, and Salvager
processes (B<fileserver>, B<volserver>, and B<salvager>).

=item kaserver

The Authentication Server process.

=item ptserver

The Protection Server process.

=item runntp

The controller process for the Network Time Protocol Daemon (obsolete).

=item upclientbin

The client portion of the Update Server process that retrieves binary
files from the F</usr/afs/bin> directory of the binary distribution
machine for this machine's CPU/operating system type. (The name of the
binary is B<upclient>, but the C<bin> suffix distinguishes this process
from C<upclientetc>.)

=item upclientetc

The client portion of the Update Server process that retrieves
configuration files from the F</usr/afs/etc> directory of the system
control machine. (The name of the binary is B<upclient>, but the C<etc>
suffix distinguishes this process from C<upclientbin>.)

=item upserver

The server portion of the Update Server process.

=item vlserver

The Volume Location (VL) Server process.

=back

=item B<-type> <I<server type>>

Specifies the process's type. The acceptable values are:

=over 4

=item cron

Use this value for cron-type processes that the BOS Server starts only at
a defined daily or weekly time, rather than whenever it detects that the
process has terminated. AFS does not define any such processes by default,
but makes this value available for administrator use. Define the time for
command execution as part of the B<-cmd> argument to the B<bos create>
command.

=item dafs

Use this value only for the dafs process, which combines the File Server,
Volume Server, Salvage Server, and Salvager processes in order to operate
as a Demand Attach File Server.  If one of the component processes
terminates, the BOS Server shuts down and restarts the process in the
appropriate order.

=item fs

Use this value only for the fs process, which combines the File Server,
Volume Server and Salvager processes. If one of the component processes
terminates, the BOS Server shuts down and restarts the processes in the
appropriate order.

=item simple

Use this value for all processes listed as acceptable values to the
B<-instance> argument, except for the B<fs> and B<dafs> processes.  
There are no interdependencies between simple processes, so the 
BOS Server can stop and start them independently as necessary.

=back

=item B<-cmd> <I<command lines>>+

Specifies each command the BOS Server runs to start the process.  Specify
no more than six commands (which can include the command's options, in
which case the entire string is surrounded by double quotes); any
additional commands are ignored.

For a simple process, provide the complete pathname of the process's
binary file on the local disk (for example, F</usr/afs/bin/ptserver> for
the Protection Server). If including any of the initialization command's
options, surround the entire command in double quotes (C<"">). The
B<upclient> process has a required argument, and the commands for all
other processes take optional arguments.

For the B<fs> process, provide the complete pathname of the local disk
binary file for each of the component processes: B<fileserver>,
B<volserver>, and B<salvager>, in that order. The standard binary
directory is F</usr/afs/bin>.  If including any of an initialization
command's options, surround the entire command in double quotes (C<"">).

For the B<dafs> process, provide the complete pathname of the local disk
binary file for each of the component processes: B<dafileserver>,
B<davolserver>, B<salvageserver>, and B<dasalvager>, in that order. The
standard binary directory is F</usr/afs/bin>.  If including any of an
initialization command's options, surround the entire command in double
quotes (C<"">).

For a cron process, provide two parameters:

=over 4

=item *

The complete local disk pathname of either an executable file or a command
from one of the AFS suites (complete with all of the necessary
arguments). Surround this parameter with double quotes (C<"">) if it
contains spaces.

=item *

A specification of when the BOS Server executes the file or command
indicated by the first parameter. There are three acceptable values:

=over 4

=item *

The string C<now>, which directs the BOS Server to execute the file or
command immediately and only once. It is usually simpler to issue the
command directly or issue the B<bos exec> command.

=item *

A time of day. The BOS Server executes the file or command daily at the
indicated time. Separate the hours and minutes with a colon (I<hh:MM>),
and use either 24-hour format, or a value in the range from C<1:00>
through C<12:59> with the addition of C<am> or C<pm>. For example, both
C<14:30> and C<"2:30 pm"> indicate 2:30 in the afternoon. Surround this
parameter with double quotes (C<"">) if it contains a space.

=item *

A day of the week and time of day, separated by a space and surrounded
with double quotes (C<"">). The BOS Server executes the file or command
weekly at the indicated day and time. For the day, provide either the
whole name or the first three letters, all in lowercase letters (C<sunday>
or C<sun>, C<thursday> or C<thu>, and so on). For the time, use the same
format as when specifying the time alone.

=back

=back

=item B<-notifier> <I<notifier program>>

Specifies the complete pathname on the local disk of a program that the
BOS Server invokes when the process terminates. The AFS distribution does
not include any notifier programs, but this argument is available for
administrator use. See L</NOTES>.

=item B<-cell> <I<cell name>>

Names the cell in which to run the command. Do not combine this argument
with the B<-localauth> flag. For more details, see L<bos(8)>.

=item B<-noauth>

Assigns the unprivileged identity C<anonymous> to the issuer. Do not
combine this flag with the B<-localauth> flag. For more details, see
L<bos(8)>.

=item B<-localauth>

Constructs a server ticket using a key from the local
F</usr/afs/etc/KeyFile> file. The B<bos> command interpreter presents the
ticket to the BOS Server during mutual authentication. Do not combine this
flag with the B<-cell> or B<-noauth> options. For more details, see
L<bos(8)>.

=item B<-help>

Prints the online help for this command. All other valid options are
ignored.

=back

=head1 EXAMPLES

The following command defines and starts the simple process
C<ptserver> on the machine C<fs3.abc.com>:

   % bos create -server fs3.abc.com -instance ptserver -type simple \
                -cmd /usr/afs/bin/ptserver

The following command defines and starts the simple process C<upclientbin>
on the machine C<fs4.abc.com>. It references C<fs1.abc.com> as the source
for updates to binary files, checking for changes to the F</usr/afs/bin>
directory every 120 seconds.

   % bos create -server fs4.abc.com -instance upclientbin -type simple \
                -cmd "/usr/afs/bin/upclient fs1.abc.com -clear -t 120 \
                /usr/afs/bin"

The following command creates the B<fs> process C<fs> on the machine
C<fs4.abc.com> (a traditional File Server with associated processes). Type
the command on a single line.

   % bos create -server fs4.abc.com -instance fs -type fs \
                -cmd /usr/afs/bin/fileserver /usr/afs/bin/volserver \
                /usr/afs/bin/salvager

The following command creates the B<dafs> process C<dafs> on the machine
C<fs4.abc.com> (a demand-attach File Server with associated processes).
Type the command on a single line.

   % bos create -server fs4.abc.com -instance dafs -type dafs \
                -cmd /usr/afs/bin/dafileserver \
                /usr/afs/bin/davolserver \
                /usr/afs/bin/salvageserver /usr/afs/bin/dasalvager

The following command creates a cron process called C<userbackup> on the
machine C<fs5.abc.com>, so that the BOS Server issues the indicated B<vos
backupsys> command each day at 3:00 a.m. (the command creates a backup
version of every volume in the file system whose name begins with
C<user>). Note that the issuer provides the complete pathname to the
B<vos> command, includes the B<-localauth> flag on it, and types the
entire B<bos create> command on one line.

   % bos create -server fs5.abc.com -instance userbackup -type cron  \
       -cmd "/usr/afs/bin/vos backupsys -prefix user -localauth" 03:00

To switch from a traditional File Server to a demand-attach File Server,
run:

   % bos status localhost -instance fs -long

to see the current B<fileserver> and B<volserver> flags for an existing
traditional File Server configuration. (Substitute the C<dafs> instance
for an existing demand-attach File Server.) Then, run:

   % bos stop localhost fs -localauth
   % bos delete localhost fs -localauth
   % bos create localhost dafs dafs \
       "/usr/afs/bin/dafileserver <fileserver-flags>" \
       "/usr/afs/bin/davolserver <volserver-flags>" \
       /usr/afs/bin/salvageserver /usr/afs/bin/dasalvager

replacing <fileserver-flags> and <volserver-flags> with the flags from the
previous configuration. This will stop the traditional File Server and
start a demand-attach File Server. The binaries at the paths provided must
already be updated to binaries built with demand-attach enabled.

=head1 PRIVILEGE REQUIRED

The issuer must be listed in the F</usr/afs/etc/UserList> file on the
machine named by the B<-server> argument, or must be logged onto a server
machine as the local superuser C<root> if the B<-localauth> flag is
included.

The B<bos create> command cannot be run against servers which are in
restricted mode.

=head1 NOTES

If the B<-notifier> argument is included when this command is used to
define and start a process, the BOS Server invokes the indicated
I<notifier program> when the process exits. The intended use of a notifier
program is to inform administrators when a process exits unexpectedly, but
it can be used to perform any appropriate actions.  The following
paragraphs describe the bnode and bnode_proc structures in which the
BOS Server records information about the exiting process.

The BOS Server constructs and sends on the standard output stream one
bnode and one bnode_proc structure for each exiting process associated
with the notifier program. It brackets each structure with appropriate
C<BEGIN> and C<END> statements (C<BEGIN bnode> and C<END bnode>, C<BEGIN
bnode_proc> and C<END bnode_proc>), which immediately follow the preceding
newline character with no intervening spaces or other characters. If the
notifier program does not need information from a structure, it can scan
ahead in the input stream for the C<END> statement.

In general, each field in a structure is a string of ASCII text terminated
by the newline character. The format of the information within a structure
possibly varies slightly depending on the type of process associated with
the notifier program.

The C code for the bnode and bnode_proc structures follows. Note that the
structures sent by the BOS Server do not necessarily include all of the
fields described here, because some are used only for internal record
keeping. The notifier process must robustly handle the absence of expected
fields, as well as the presence of unexpected fields, on the standard
input stream.

For proper performance, the notifier program must continue processing the
input stream until it detects the end-of-file (EOF). The BOS Server closes
the standard input file descriptor to the notifier process when it has
completed delivery of the data, and it is the responsibility of the
notifier process to terminate properly.

struct bnode contents:

   struct bnode {
      struct bnode *next;      /* next pointer in top-level's list */
      char *name;              /* instance name */
      long nextTimeout;        /* next time this guy should be awakened */
      long period;             /* period between calls */
      long rsTime;             /* time we started counting restarts */
      long rsCount;            /* count of restarts since rsTime */
      struct bnode_type *type; /* type object */
      struct bnode_ops *ops;   /* functions implementing bnode class */
      long procStartTime;      /* last time a process was started */
      long procStarts;         /* number of process starts */
      long lastAnyExit;        /* last time a process exited for any reason */
      long lastErrorExit;      /* last time a process exited unexpectedly */
      long errorCode;          /* last exit return code */
      long errorSignal;        /* last proc terminating signal */
      char *lastErrorName;     /* name of proc that failed last */
      short refCount;          /* reference count */
      short flags;             /* random flags */
      char goal;               /* 1=running or 0=not running */
      char fileGoal;           /* same, but to be stored in file */
};

Format of struct bnode explosion:

   printf("name: %s\n",tp->name);
   printf("rsTime: %ld\n", tp->rsTime);
   printf("rsCount: %ld\n", tp->rsCount);
   printf("procStartTime: %ld\n", tp->procStartTime);
   printf("procStarts: %ld\n", tp->procStarts);
   printf("lastAnyExit: %ld\n", tp->lastAnyExit);
   printf("lastErrorExit: %ld\n", tp->lastErrorExit);
   printf("errorCode: %ld\n", tp->errorCode);
   printf("errorSignal: %ld\n", tp->errorSignal);
   printf("lastErrorName: %s\n", tp->lastErrorName);
   printf("goal: %d\n", tp->goal);

struct bnode_proc contents:

   struct bnode_proc {
      struct bnode_proc *next; /* next guy in top-level's list */
      struct bnode *bnode;     /* bnode creating this process */
      char *comLine;           /* command line used to start this process */
      char *coreName;          /* optional core file component name */
      long pid;                /* pid if created */
      long lastExit;           /* last termination code */
      long lastSignal;         /* last signal that killed this guy */
      long flags;              /* flags giving process state */
};

Format of struct bnode_proc explosion:

   printf("comLine: %s\n", tp->comLine);
   printf("coreName: %s\n", tp->coreName);
   printf("pid: %ld\n", tp->pid);
   printf("lastExit: %ld\n", tp->lastExit);
   printf("lastSignal: %ld\n", tp->lastSignal);

=head1 SEE ALSO

L<BosConfig(5)>,
L<KeyFile(5)>,
L<UserList(5)>,
L<bos(8)>,
L<buserver(8)>,
L<dafileserver(8)>,
L<dasalvager(8)>,
L<davolserver(8)>,
L<fileserver(8)>,
L<kaserver(8)>,
L<ptserver(8)>,
L<salvager(8)>,
L<salvageserver(8)>,
L<upclient(8)>,
L<upserver(8)>,
L<vlserver(8)>,
L<volserver(8)>,
L<vos_backupsys(1)>

=head1 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.
