CYCBUFF.CONF(5)CYCBUFF.CONF(5)NAMEcycbuff.conf - configuration file for CNFS method
DESCRIPTION
The file <pathetc in inn.conf>/cycbuff.conf is required if
CNFS (Cyclic News File System) method is used. CNFS is
one of storage method which can be defined at stor_
age.conf(5).
The file consists of a series of lines; blank lines and
lines beginning with a number sign (``#'') are ignored.
There are four kinds of configuration lines: ``cycbuffup
date'', ``refreshinterval'', ``cycbuff'' and ``metacy
cbuff.'' The order of lines in this file is not important
among the same kind of configuration line. But all
``cycbuff'' lines should be presented before any ``metacy
cbuff'' lines.
``Cycbuffupdate'' line is formatted as:
cycbuffupdate:update
``Update'' is how many article-stores between cycbuff
header updates. This line can be omitted and the default
value is ``25.''
``Refreshinterval'' line is formatted as:
refreshinterval:interval
``Inerval'' is what interval (seconds) between rereading
cycbuff header if cycbuff is preopend. (This is in the
case nnrpd(8) runs as a daemon.) This line can be omitted
and the default value is ``30.''
``Cycbuff'' line is formatted as:
cycbuff:buffer_name:file_name:buffer_size
``Buffer_name'' is the symbolic name of the buffer. The
length of this name should be within 7 letters. This name
is referred at ``metacycbuff'' lines. ``File_name'' is
the path to buffer file. The length of this path should
be within 63 letters. ``Buffer_size'' is the length of
buffer file in kilobytes in decimal (1KB = 1024 bytes).
If the ``file_name'' is not a special device, the file
should be buffer_size * 1024 bytes.
``Metacycbuff'' line is formatted as:
metacycbuff:meta_cyclic_buffer_name:buffer_names[:mode]
``Meta_cyclic_buffer_name'' is the symbolic name of meta-
cyclic buffer. This name is referred at ``options'' field
at ``cnfs'' entries in storage.conf(5). ``Buffer_names''
is comma separated list of symbolic names of ``cycbuff.''
These buffer names should be defined at ``cycbuff'' lines.
If ``buffer_names'' has more than one buffer names, CNFS
method stores articles into each ``cycbuff'' in order
cyclically. ``Mode'' is the mode of storing article.
Currently there are two mode; ``INTERLEAVE'' and ``SEQUEN
TIAL''. Mode ``INTERLEAVE'' is to store articles into
each cycbuff in round robin way. Mode ``SEQUENTIAL'' is
to store articles sequentially into one cycbuff until it
is filled up. ``Mode'' is optional and the default value
without this option is ``INTERLEAVE''.
Also it is necessary to set up ``options'' field at
``cnfs'' entries in storage.conf(5) to use CNFS method.
That field should be one of ``meta_cyclic_buffer_name''
defined at ``metacycbuff'' lines.
To create new ``cycbuff'', there are two different methods
for creating the cyclic buffer files.
1. Create a big file on top of a standard filesystem.
The use "dd" to create the ``cycbuff'' files, such
as "dd if=/dev/zero of=/path/to/cycbuff bs=32k
count=N" where N is the buffer_size divided by 32.
2. Use block disk devices directly.
If your operating system will allow you to mmap()
block disk devices (Solaris does, FreeBSD does
not), this is the recommended method. Partition
the disks to make each partition slightly larger (a
few MB larger) than the intended size of each
cycbuff. It is not recommend to use the block
device files already located in ``/dev.'' Instead,
use "mknod" to create a new set of block device
files. In order to do this, do an "ls -Ll" of the
/dev/dsk partition. The major and minor device
numbers are in the fifth and sixth columns (right
before the date) respectively. This information
should be fed to "mknod" to make a "block-type spe
cial file" (b). Here is a short script that accom
plishes this when fed the ``/dev/dsk/'' partition
name:
#!/bin/sh
disk=$1
link=`ls -l /dev/dsk/$disk | awk '{print $11}'`
major=`ls -l /dev/dsk/$link | awk '{print $5}' | tr -d ,`
minor=`ls -l /dev/dsk/$link | awk '{print $6}`
mkdir /cycbuff
mknod /cycbuff/$disk b $major $minor
The created device files themselves consume very
little space.
In either case, make certain that each overview buffer
file is owned by <USER speci_
fied with --with-news-user at configure>, <GROUP speci_
fied with --with-news-group at configure>, and has
read/write modes for the owner and group (mode ``0664'' or
``0660'').
When you first start innd and everything is configured
properly, you should see messages in news.notice which
look like:
Mar 1 00:00:00 kevlar innd: CNFS-sm No magic cookie found for cycbuff ONE, initializing
HISTORY
Written by Katsuhiro Kondou <kondou@nec.co.jp> for Inter
NetNews. This is revision 1.13.2.1, dated 2000/08/17.
SEE ALSOinn.conf(5), storage.conf(5).
CYCBUFF.CONF(5)
