lb_admin - Location Broker Administrative Tool
/etc/ncs/lb_admin [ -version ] [ -nq]
The tool monitors and administers the registrations of DECrpc-based servers in Global Local Broker (GLB) or Local Location Broker (LLB)
databases. A server registers Universal Unique Identifiers (UUIDs) specifying an object, a type, and an interface, along with a socket
address specifying its location. A client can locate servers by issuing lookup requests to GLBs and LLBs.
In accepting input or displaying output, uses either character strings or descriptive textual names to identify objects, types, and inter-
faces. A character string directly represents the data in a UUID in the following format:
where each n is a hexadecimal digit.
With you examine or modify only one database at a time, referred to as the current database. The command selects the type of Location Bro-
ker database, GLB or LLB. The command selects the host whose LLB database is to be accessed.
Information about individual command interfaces is available through the command.
-nq Do not query for verification of wildcard expansions in operations.
-version Display the version of the Network Computing Kernel (NCK) that this belongs to, but do not start the tool. (NCK is
part of the Network Computing System (NCS) on which DECrpc is based.)
In the descriptions of and the object, type, and interface arguments can be either character strings representing UUIDs or textual names
corresponding to UUIDs, as described earlier.
In the descriptions of and the location argument is a string in the format family:host[port], where family is an address family, host is a
host name, and port is a port number. The only value for family is ip. You can use a leading number sign (#) to indicate that a host name
is in the standard numeric form. For example, ip:vienna, and ip:#220.127.116.11 are both acceptable location specifiers.
Find and delete obsolete entries in the current database.
When you issue the command, attempts to contact each server registered in the database. If the server does not respond, tries to
look up its registration in the LLB database at the host where the server is located, tells you the result of this lookup, and
asks whether you want to delete the entry. If a server responds, but its UUIDs do not match the entry in the database, tells you
this result and asks whether you want to delete the entry, even if you used the -nq option to
There are two situations in which it is likely that a database entry should be deleted:
o The server does not respond, succeeds in contacting the LLB at the host where the server is located, and the server is not
registered with that LLB. The server is probably no longer running.
o A server responds, but its UUIDs do not match the entry in the database. The server that responded is not the one that
registered the entry.
Entries that meet either of these conditions are probably safe to delete and are considered eligible for automatic deletion
(described in the next paragraph). In other situations, it is best not to delete the entry unless you can verify directly that
the server is not running (for example, by listing the processes running on its host).
When the command asks whether you want to delete an entry, choose one of the following responses:
Delete the entry.
n[o] Leave the entry intact in the current database.
g[o] Invoke automatic deletion, in which all eligible entries (see the previous paragraph) are deleted and all ineligible entries
are left intact, without your being queried, until all entries have been checked.
Terminate the operation.
Display a description of the specified command or, if none is
specified, list all of the commands.
Look up and display all entries with matching object, type, and
interface fields in the current database. Use the letter l to list all of the entries in the database. You can use asterisks
as wildcards for any of the arguments. If all the arguments are wildcards, or if no arguments are given, displays the entire
Exit the session.
Add the specified entry to the current database. You can use an
asterisk to represent the nil UUID in the object, type, and interface fields.
The annotation is a string of up to 64 characters annotating the entry. Use double quotation marks (" ") to delimit a string
that contains a space or contains no characters. To embed a double quotation mark in the string, precede it with a backslash
The flag is either local (the default) or global, indicating whether the entry should be marked for local registration only or
for registration in both the LLB and the GLB databases. The flag is a field that is stored with the entry; it does not affect
where the entry is registered. The and commands select the particular LLB or GLB database for registration.
Set the host for the current LLB or GLB. If you specify global as
the broker_switch, sets the current GLB; otherwise, it sets the current LLB. The host is a location specifier as described ear-
lier, but the [port] portion is ignored and can be omitted.
Issue the command, not the command, to determine whether subsequent operations will access the LLB or the GLB.
Set the timeout period used by
for all of its operations. With an argument of short or long, sets the timeout accordingly. With no argument, it displays the
current timeout value.
Delete the specified entry from the current database.
You can use an asterisk as a wildcard in the object, type, and interface fields to match any value for the field. Unless you
suppress queries by specifying the -nq option of asks you whether to delete each matching entry. Choose one of the following
Delete the entry.
n[o] Leave the entry in the database.
g[o] Delete all remaining database entries that match, without your being queried.
Terminate the operation, without deleting any more entries.
Select the type of database that subsequent operations will access, GLB
or LLB. The broker_switch is either global or local. If you do not supply a broker_switch, tells whether the current database
is global or local.
Use to select the host whose GLB or LLB is to be accessed.
Guide to the Location Broker