From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@coraid.com>
Date: Wed, 15 Oct 2008 08:42:07 -0400
To: 9fans@9fans.net
Message-ID: <7807852439120719b87d05dc1e00b529@coraid.com>
In-Reply-To: <20081015082813.GD1296@hermes.my.domain>
References: <20081015082813.GD1296@hermes.my.domain>
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Subject: Re: [9fans] How to get the diagnostics of fs(3)
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we have three different console servers at coraid.
so i've changed how consoles and console logging
works.  maybe this will be useful to other people.

here are the changes that make this work
1. instead of consoledb use /lib/ndb/consoledb.$sysname.
and have a general test for this new file in cpurc.
	if(test -f /lib/ndb/consoledb.$sysname){
		aux/consolefs -c /lib/ndb/consoledb.$sysname
		startclog
	}
2. startclog (attached) uses a new consoledb tuple
clog=$sysname, e.g. from /lib/ndb/consoledb.baron
	console=ila dev=/dev/eia5
		gid=sys
		clog=baron

(the -r flag is part of a very sneaky trick involving booting
from a skeleton kfs and binding large bits of the namespace
back via aan so that the console logger can survive loosing
its connection to the fs without having console logging
end up someplace other than the man fs.  the way to start
it is startclog; startclog -r.  this setup survived a switch gone
wild a few weeks ago.)

3. add the directory /sys/log/clog & create the console
files you wish.

- erik
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#!/bin/rc
rfork e
rflag=0
if(~ $1 -r)
	rflag=1
cd /mnt/consoles
for(i in *){
	x = `{ndb/query -f/lib/ndb/consoledb.$sysname console $i clog}
	if(~ $rflag 0 && ~ $x $sysname){
		log=/sys/log/clog/$i
		if(~ $rflag 1){
			mkdir -p /tmp/clog
			log=/tmp/clog/$i
		}
		while(~ 1 1){
			echo aux/clog $log /mnt/consoles/$i
			aux/clog /mnt/consoles/$i $log && echo clog exits $status
			sleep 10;
		}
	}&
}
fn rotate{
	rm /tmp/oclog/*
	cp /tmp/clog/* /tmp/oclog
	rm /tmp/clog/*
}
if(~ $rflag 1){
	mkdir -p /tmp/oclog /tmp/clog
	while(~ 1 1){
		sleep 600
		s=`{du -a /tmp/clog| sed 's/[ 	].*//g'}
		if(test $s -gt 10000)
			rotate
	}
}&
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