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Last login: Mon Aug 3 03:54:46 1998 from polysynaptic.iq.
Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994
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The official
<PRE> _ _
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<CENTER>
<H1>
NNTPCACHE FREQUENTLY ASKED QUESTIONS AND ANSWERS</H1></CENTER>
<CENTER>Peter Tonoli <<A HREF="mailto:anarchie@suburbia.net">anarchie@suburbia.net</A>></CENTER>
<CENTER>This is the list of frequently asked questions, and the answers
to those questions for nntpcache, the caching NNRP server daemon.</CENTER>
<CENTER>
<HR WIDTH="100%"></CENTER>
<CENTER> </CENTER>
<CENTER>
<H2>
Index</H2></CENTER>
Section 1. Introduction and General Information
<BR> Q1.1 <A HREF="#Q1.1">What is nntpcache?</A>
<BR> Q1.2 <A HREF="#Q1.2">What operating systems does
nntpcache support?</A>
<BR> Q1.3 <A HREF="#Q1.3">Where can I find nntpcache?
/ Where is the latest version?</A>
<BR> Q1.4 <A HREF="#Q1.4">Can I use nntpcache freely
or do I have to license it?</A>
<P>Section 2. Frequently encountered problems and solutions
<BR> Q2.1 <A HREF="#Q2.1">My system chokes on all that
damned mmap()ing?!. What can I do?</A>
<BR> Q2.2 <A HREF="#Q2.2">Netscape-news kills itself
when reading news from nntpcache-0.88.3!</A>
<BR> Q2.3 <A HREF="#Q2.3">Expiring with nntpcached -e
doesn't work</A>
<BR> Q2.4 <A HREF="#Q2.4">Help! The size of our cache
keeps growing! What should I do about expiration?</A>
<BR> Q2.5 <A HREF="#Q2.5">nntpcache spits out : 'post
failed From: address not in Internet syntax'. What does that mean?</A>
<BR> Q2.6 <A HREF="#Q2.6">Why does nntpcache-update take
so long to load at initialisation?</A>
<P>Section 3. Support and Resources
<BR> Q3.1 <A HREF="#Q3.1">Is there a nntpcache mailinglist?</A>
<BR> Q3.2 <A HREF="#Q3.2">How do I unsubscribe from the
mailinglist?</A>
<BR> Q3.3 <A HREF="#Q3.3">Is there an archive of the
nntpcache mailinglist?</A>
<BR> Q3.4 <A HREF="#Q3.4">Is there an official nntpcache
home page?</A>
<BR> Q3.5 <A HREF="#Q3.5">Who should I contact if I can't
get nntpcache to work / I've found a bug in nntpcache, what should I do?</A>
<P>Section 4. Configuration of nntpcache
<BR> Q4.1 <A HREF="#Q4.1">What are all those entries
in the servers configuration file?</A>
<BR> Q4.2 <A HREF="#Q4.2">How do I specify the "Xref:full"
part in the "overviewFmt" line in the config file?</A>
<BR> Q4.3 <A HREF="#Q4.3">I've entered a server but nntpcache
doesn't seem to want to know about it.</A>
<BR> Q4.4 <A HREF="#Q4.4">I want to set the nntpcache-virtual-server-size
record, what are some public news-servers I can add to my servers file?</A>
<P>
<HR WIDTH="100%">
<BR><A NAME="Q1.1"></A>Question 1.1. What is nntpcache?
<BR>
<UL>Nntpcache (efficiently) executes on the localhost pretending to be
an NNRP news reading server. In fact, what it does is pass certain NNTP
commands through to real (remote and possibly local) news-servers based
on various pattern matching rules. nntpcache then takes the output from
those servers and caches & indexes it in funky ways (much specific
case magic goes into this). The next time such information is asked for,
or other information which can be logically inferred from the previously
collated information, it is sent directly from the cache, without consulting
the remote servers. It provides multi-server group merging, and sophisticated
weighted content-filtering, access control and a chrooted environment.
It makes heavy use of shared memory, copy-on-write, fd caches, mmaping
and more for efficiency capable of serving thousands of simultaneous users.</UL>
<UL>To sum that up in layman's terms : nntpcache is a cache, similar to
the Squid object-cache, but nntpcache works on newsgroups. By acting as
a cache, nntpcache transparently and efficiently saves bandwidth enough
to feed a small nation. It can also merge dozens of news servers into one
large "virtual" news server, and provide content filtering (censoring!
censoring!). It's a miserly beast with cpu and memory due to some gee-whizz
trickery.</UL>
<HR WIDTH="100%">
<P><A NAME="Q1.2"></A>Question 1.2. What operating systems does nntpcache
support?
<BR>
<UL>nntpcache has been known to compile under these systems :
<P>* BSD
<BR> FreeBSD 2.2-CURRENT + GCC2.6.3
<BR> BSDI [something]
<UL> </UL>
* LINUX
<BR> Linux 1.3.77 + GCC 2.7.2 + libc5.2.18
<UL> </UL>
* SOLARIS 2.4 + Native CC
<P>* HP-UX
<BR> HP-UX 9.05 + HP ANSI C
<UL> </UL>
* OSF/1
<P>If you find a OS/compiler/library tuple that nntpcache appears to compile
and run under, then don't keep it to yourself, please let tell the devteam
at <A HREF="mailto:nntpcache@nntpcache.org">nntpcache@nntpcache.org</A>!
(this list is.. err dated - nntpcache works on nearly all modern unixes)</UL>
<HR WIDTH="100%">
<P><A NAME="Q1.3"></A>Question 1.3. Where can I find nntpcache? / Where
is the latest version?
<BR>
<UL>The original archive is at : <A HREF="ftp://ftp.nntpcache.org/pub/nntpcache/nntpcache.tar.gz">ftp://ftp.nntpcache.org/pub/nntpcache/nntpcache.tar.gz</A>
<P>The UK, Europe and US mirror of nntpcache can be accessed at: <A HREF="ftp://planete.theplanet.net/pub/nntpcache/nntpcache.tar.gz">ftp://planete.theplanet.net/pub/nntpcache/nntpcache.tar.gz</A>
<P>The Norwegian and European mirror is at : <A HREF="ftp://ftp.nethelp.no/pub/news/nntpcache-1.0.7.1.tar.gz">ftp://ftp.nethelp.no/pub/news/nntpcache-1.0.7.1.tar.gz</A>
<P>FreeBSD 2.2.x and above has a port/package available in the ports system
in news/nntpcache
<P>Rumors on the wire suggest a Debian package also, but don't oink on
it.
<BR> </UL>
<HR WIDTH="100%">
<P><A NAME="Q1.4"></A>Question 1.4. Can I use nntpcache freely or do I
have to license?
<BR>
<UL>Probably. It depends on who you are. See the LICENSING file for full
details, but in a nutshell, individuals, non-military, non-profit research
groups, non-profit organisations (including educational institutions) and
medical or educational government departments may use nntpcache freely.
Everyone else (that is commercial organisations and government) are required
to license in order to fund on-going development and support.</UL>
<HR WIDTH="100%">
<P><A NAME="Q2.1"></A>Question 2.1. My system chokes on all that damned
mmap()ing?!. What can I do?
<UL>a) upgrade your OS. For instance, linux 1.2.13's mmap() does not work
correctly in shared mode. Linux 2.0 rectified this.
<P>b) get a decent OS. Ultrix mmap is totally broken!</UL>
<HR WIDTH="100%">
<P><A NAME="Q2.2"></A>Question 2.2. Netscape-news kills itself when reading
news from nntpcache-0.88.3!
<BR>
<UL>We know. Didn't get a bugs-bounty either. Geesh. nntpcache-0.90+ formats
its data in a way that makes netscape happier. But it IS netscape's fault
for expecting nnrpd style response messages.</UL>
<HR WIDTH="100%">
<P><A NAME="Q2.3"></A>Question 2.3. Expiring with nntpcached -e doesn't
work
<BR>
<UL>Running nntpcached -e on a system that is already running nntpcache
doesn't work. To expire on a system that is already running nntpcache,
send the nntpcache process the USR2 signal.</UL>
<HR WIDTH="100%">
<P><A NAME="Q2.4"></A>Question 2.4. Help! The size of our cache keeps growing!
What should I do about expiration?
<BR>
<UL>Expiration should be automatic, it is controlled by the following in
the config file:
<BR>
<PRE># expire if there are under this number of blocks in the cache</PRE>
<PRE># partition</PRE>
<PRE>minBlocksFree 1000</PRE>
<PRE># run expire if there are under this number of inodes in the cache</PRE>
<PRE># partition</PRE>
<PRE>minFilesFree 1000</PRE>
<PRE># don't let the history file grow larger than this (bytes) hisHighWater 60M</PRE>
<PRE># when it does, trim it back to this (bytes)</PRE>
<PRE>hisLowWater 40M</PRE>
<PRE># When we do an expire, kill articles older than this</PRE>
<PRE>maxArtAge 2w</PRE>
<PRE># check disk space, etc for automatic expiry this often</PRE>
<PRE># (but only after a client connects or disconnects)</PRE>
<PRE>expireCheckPeriod 5m</PRE>
The important point that isn't made clear here is that expire runs only
occur when <I>minBlocksFree</I> or <I>minFilesFree</I> are not satisfied.
i.e the cache will happily grow until the disk starts filling up. Cache
expiration isn't incredibly intelligent, although it is very fast and tries
to track the actual state of affairs on the remote server.</UL>
<HR WIDTH="100%">
<P><A NAME="Q2.5"></A>Question 2.5. nntpcache spits out : 'post failed
From: address not in Internet syntax'. What does that mean?
<BR>
<UL>That error message translated into normal English means: Your attempt
to post failed because the address in the "From:" field was not in the
format user@host. To solve the problem, ensure you have a correct reply-to
address configured in the newsreader.</UL>
<HR WIDTH="100%">
<BR><A NAME="Q2.6"></A>Question 2.6. Why does nntpcache-update take so
long to load at initialisation?
<UL>nntpcache update takes a while on master startup since it loads overview.fmt,
active, newsgroups and active.times lists from the providing server(s).
these lists typically run into several mega-bytes, and nntpcache isn't
able to serve clients till it has its hot little hands on this vital information.</UL>
<HR WIDTH="100%">
<BR><A NAME="Q3.1"></A>Question 3.1. Is there a nntpcache mailinglist?
<BR>
<UL>Sure is! To join the thrills and spills of the mailinglist! Poke fun
at Julian's coding style! Find bugs in Herbert Xu's bug fixes! Submit nntpcache
filters to filter out all messages posted by the Kook of the Month and
more! Send a message with the subject of 'subscribe' to the address '<A HREF="mailto:nntpcache-users-request@nntpcache.org">nntpcache-users-request@nntpcache.org</A>'
(without the single quotes).</UL>
<HR WIDTH="100%">
<P><A NAME="Q3.2"></A>Question 3.2. How do I unsubscribe from the mailinglist?
<BR>
<UL>Unsubscribing from the mailinglist is as simple as subscribing. To
unsubscribe, send a message with the subject of 'unsubscribe' to the address
'<A HREF="mailto:nntpcache-users-request@nntpcache.org">nntpcache-users-request@nntpcache.org</A>'
(without the single quotes).</UL>
<HR WIDTH="100%">
<P><A NAME="Q3.3"></A>Question 3.3. Is there an archive of the nntpcache
mailinglist?
<BR>
<UL>Yes! There are actually two archives of the nntpcache mailinglist.
The first archive is at : <A HREF="ftp://ftp.nntpcache.org/pub/nntpcache/mailinglist">ftp://ftp.nntpcache.org/pub/nntpcache/mailinglist</A>
<P>A HTML version of the mailinglist archive is available at: <A HREF="http://www.support.nl/online/nntpquery.html">http://www.support.nl/online/nntpquery.html</A></UL>
<HR WIDTH="100%">
<P><A NAME="Q3.4"></A>Question 3.4. Is there an official nntpcache home
page?
<BR>
<UL>Is the pope catholic? The official nntpcache home-page is accessible
at <A HREF="http://www.nntpcache.org/">http://www.nntpcache.org/</A></UL>
<HR WIDTH="100%">
<P><A NAME="Q3.5"></A>Question 3.5. Who should I contact if I can't get
nntpcache to work / I've found a bug in nntpcache, what should I do?
<BR>
<UL>If you're not subscribed to the mailinglist, send your report to '<A HREF="mailto:nntpcache@nntpcache.org">nntpcache@nntpcache.org</A>',
otherwise send your report to the mailinglist. Along with your report,
send your servers and access files and syslog output if appropiate to expedite
a fix to your problem. ok. ok. expedite is a euphemism :)</UL>
<HR WIDTH="100%">
<BR><A NAME="Q4.1"></A>Question 4.1. What are all those entries in the
servers configuration file?
<BR>
<UL>They signify how long nntpcache should keep the following
<P>* Active
<BR>the active file
<P>* Act.tim
<BR>active.times
<P>* Newsgrp
<BR>newsgroups
<P>* Group
<BR>What you get if you / a client types 'group some.newsgroup'
<P>* Xover
<BR>What you get if you / a client types 'xover low-high'
<P>* Arts
<BR>What you get if you / a client types 'head/body/article no'</UL>
<HR WIDTH="100%">
<BR><A NAME="Q4.2"></A>Question 4.2. How do I specify the "Xref:full" part
in the "overviewFmt" line in the config file?
<BR>
<UL>You shouldn't have to specify the overviewFmt thing if the remote server
supports 'LIST overview.fmt'. But if you insist, just 'Xref' will do.</UL>
<HR WIDTH="100%">
<P><A NAME="Q4.3"></A>Question 4.3. I've entered a server but nntpcache
doesn't seem to want to know about it.
<BR>
<UL>Have you made sure there's a period ('.') after the domain name of
your server?
<P>For example:
<UL>
<PRE>news.mynet.net DEFAULT 4h 2d 2d 30m 60d 60d</PRE>
is probably wrong, but:
<PRE>news.mynet.net. DEFAULT 4h 2d 2d 30m 60d 60d</PRE>
is likely correct.
<BR>
<BR> </UL>
It isn't essential to use a period after the domain name ('.'), but it
is essential that you use do so *consistently*. The period is used to anchor
the domain to speed domain lookups, and nntpcache will treat references
to a server without a period as an entirely different server to one with
a period. If the server in questions is in /etc/hosts and you /etc/resolv.conf
(or equivalent) tells your DNS resolver library routines to search /etc/hosts
before NIS/DNS then you probably DON'T want the period appended (unless
you have a corresponding period in the /etc/hosts entry)</UL>
<HR WIDTH="100%">
<P><A NAME="Q4.4"></A>Question 4.4. I want to set the nntpcache-virtual-server-size
record, what are some public news-servers I can add to my servers file?
<BR>
<UL>>Does anyone have a list of corporate newsservers (ie: msnews.microsoft.com
>for microsoft.*, news.3dfx.com for 3dfx.*, etc.)?
<P>If anyone can add to or has corrections for this list, please let me
know. Some entries are commented because I haven't had time to specifically
add all groups they carry or because they weren't responding.
<BR>
<PRE>newsgroups.intel.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>msnews.microsoft.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.3dfx.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>miriam.fuller.edu. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>adesknews.autodesk.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>forums.borland.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>hope.harvard.net. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>cnews.corel.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.avault.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.linkexchange.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>#forums.macromedia.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>#news.activeie.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>#news.interaktiv-media.se. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>publicnews.msn.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.netobjects.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>secnews.netscape.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>beetle.privatei.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>massena.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>cor.newman.upenn.edu. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>forums.powersoft.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.sff.net. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>nntp.net-link.net. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>service.symantec.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>#jazz.trumpet.com.au. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.turbopower.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.ksc.nasa.gov. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>news.glbs.com. DEFAULT 24h 4d 4d 30m 60d 60d</PRE>
<PRE>%BeginGroups</PRE>
<PRE># Group pattern Host</PRE>
<PRE>* your.main.server.here</PRE>
<PRE>alt.oui.support* beetle.privatei.com.</PRE>
<PRE>asp.* news.glbs.com.</PRE>
<PRE>audioweb.* news.glbs.com.</PRE>
<PRE>3dfx.* news.3dfx.com.</PRE>
<PRE>autodesk.* adesknews.autodesk.com.</PRE>
<PRE>avault.* news.avault.com.</PRE>
<PRE>borland.* forums.borland.com.</PRE>
<PRE>cakewalk.* hope.harvard.net.</PRE>
<PRE>corel.* cnews.corel.com.</PRE>
<PRE>crescent.* news.glbs.com.</PRE>
<PRE>db.* news.glbs.com.</PRE>
<PRE>forum.* news.avault.com.</PRE>
<PRE>glbs.* news.glbs.com.</PRE>
<PRE>intel.* newsgroups.intel.com.</PRE>
<PRE>le.* news.linkexchange.com.</PRE>
<PRE>linux.* miriam.fuller.edu.</PRE>
<PRE>microsoft.* msnews.microsoft.com.</PRE>
<PRE>msn.* publicnews.msn.com.</PRE>
<PRE>net-link.* nntp.net-link.net.</PRE>
<PRE>netobjects.* news.netobjects.com.</PRE>
<PRE>netscape.* secnews.netscape.com.</PRE>
<PRE>ntworthy* news.glbs.com.</PRE>
<PRE>people.* secnews.netscape.com.</PRE>
<PRE>pilot.* massena.com.</PRE>
<PRE>powerbasic.* news.glbs.com.</PRE>
<PRE>powersoft.* forums.powersoft.com.</PRE>
<PRE>sff.* news.sff.net.</PRE>
<PRE>sybase.* forums.powersoft.com.</PRE>
<PRE>symantec.* service.symantec.com.</PRE>
<PRE>#trumpet.* jazz.trumpet.com.au.</PRE>
<PRE>turbopower.* news.turbopower.com.</PRE>
<PRE>woll2woll* news.glbs.com.</PRE>
<PRE>mail.winvn news.ksc.nasa.gov.</PRE>
<PRE>perl.porters-gw cor.newman.upenn.edu.</PRE>
</UL>
<HR WIDTH="100%">
<P>Acknowledgements:
<UL>Alan Brown <<A HREF="mailto:alan@manawatu.gen.nz">alan@manawatu.gen.nz</A>>
<BR>Herbert Xu <<A HREF="mailto:herbert@greathan.apana.org.au">herbert@greathan.apana.org.au</A>>
<BR>Julian Assange <<A HREF="mailto:proff@nntpcache.org">proff@nntpcache.org</A>>
<BR>Ken Eves <<A HREF="mailto:cyberw4@cyberworldcafe.com">cyberw4@cyberworldcafe.com</A>></UL>
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