vlserver(8)
NAME
vlserver - Initializes the Volume Location Server
SYNOPSIS
vlserver [-p <number of threads>] [-nojumbo] [-jumbo] [-rxbind]
[-d <debug level>]
[-allow-dotted-principals] [-enable_peer_stats]
[-enable_process_stats] [-auditlog <log path>] [-audit-interface
(file | sysvmq)]
[-help]
DESCRIPTION
The vlserver command initializes the Volume Location (VL) Server, which runs on every database server machine. In the conventional configuration, its binary file is located in the /usr/lib/openafs directory on a file server machine. The vlserver command is not normally issued at the command shell prompt but rather placed into a file server machine's /etc/openafs/BosConfig file with the bos create command. If it is ever issued at the command shell prompt, the issuer must be logged onto a database server machine as the local superuser "root". As it initializes, the VL Server process creates the two files that constitute the Volume Location Database (VLDB), vldb.DB0 and vldb.DBSYS1, in the /var/lib/openafs/db directory if they do not already exist. Use the commands in the vos suite to administer the database. The VL Server maintains the record of volume locations in the Volume Location Database (VLDB). When the Cache Manager fills a file request from an application program, it first contacts the VL Server to learn which file server machine currently houses the volume that contains the file. The Cache Manager then requests the file from the File Server process running on that file server machine. The VL Server records a trace of its activity in the /var/log/openafs/VLLog file. Use the bos getlog command to display the contents of the file. By default, it records on a minimal number of messages. For instructions on increasing the amount of logging, see VLLog(5). By default, the VL Server runs nine lightweight processes (LWPs). To change the number, use the -p argument. This command does not use the syntax conventions of the AFS command suites. Provide the command name and all option names in full.
OPTIONS
-d <debug level>
Sets the detail level for the debugging trace written to the
/var/log/openafs/VLLog file. Provide one of the following values,
each of which produces an increasingly detailed trace: 0, 1, 5, 25,
and 125.
-p <number of threads>
Sets the number of server lightweight processes (LWPs or pthreads)
to run. Provide an integer between 3 and 16. The default is 9.
-jumbo
Allows the server to send and receive jumbograms. A jumbogram is a
large-size packet composed of 2 to 4 normal Rx data packets that
share the same header. The VL Server does not use jumbograms by
default, as some routers are not capable of properly breaking the
jumbogram into smaller packets and reassembling them.
-nojumbo
Deprecated; Jumbograms are disabled by default.
-enable_peer_stats
Activates the collection of Rx statistics and allocates memory for
their storage. For each connection with a specific UDP port on
another machine, a separate record is kept for each type of RPC
(FetchFile, GetStatus, and so on) sent or received. To display or
otherwise access the records, use the Rx Monitoring API.
-enable_process_stats
Activates the collection of Rx statistics and allocates memory for
their storage. A separate record is kept for each type of RPC
(FetchFile, GetStatus, and so on) sent or received, aggregated over
all connections to other machines. To display or otherwise access
the records, use the Rx Monitoring API.
-allow-dotted-principals
By default, the RXKAD security layer will disallow access by
Kerberos principals with a dot in the first component of their
name. This is to avoid the confusion where principals user/admin
and user.admin are both mapped to the user.admin PTS entry. Sites
whose Kerberos realms don't have these collisions between principal
names may disable this check by starting the server with this
option.
-auditlog <log path>
Turns on audit logging, and sets the path for the audit log. The
audit log records information about RPC calls, including the name
of the RPC call, the host that submitted the call, the
authenticated entity (user) that issued the call, the parameters
for the call, and if the call succeeded or failed.
-audit-interface (file | sysvmq)
Specifies what audit interface to use. Defaults to "file". See
fileserver(8) for an explanation of each interface.
-rxbind
Bind the Rx socket to the primary interface only. (If not
specified, the Rx socket will listen on all interfaces.)
-help
Prints the online help for this command. All other valid options
are ignored.
EXAMPLES
The following bos create command creates a vlserver process on the
machine "fs2.abc.com" that uses six lightweight processes. Type the
command on a single line:
% bos create -server fs2.abc.com -instance vlserver -type simple \
-cmd "/usr/lib/openafs/vlserver -p 6"
PRIVILEGE REQUIRED
The issuer must be logged in as the superuser "root" on a file server machine to issue the command at a command shell prompt. It is conventional instead to create and start the process by issuing the bos create command.
SEE ALSO
BosConfig(5), VLLog(5), vldb.DB0(5), bos_create(8), bos_getlog(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.
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
