Date: Sat, 6 Dec 2008 02:50:36 +0000 From: RW <fbsd06@mlists.homeunix.com> To: freebsd-questions@freebsd.org Subject: Re: named and ntpd start order in rc.d Message-ID: <20081206025036.3ceba57b@gumby.homeunix.com> In-Reply-To: <4939C33A.8070108@cordula.ws> References: <560f92640811211647q551daccnaec4e8085bb8e042@mail.gmail.com> <20081205190703.0dfb952d@gumby.homeunix.com> <4939C33A.8070108@cordula.ws>
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On Sat, 06 Dec 2008 01:11:38 +0100
cpghost <cpghost@cordula.ws> wrote:
> RW wrote:
> > I have a similar issue with PPP not having connected by the time
> > ntpdate runs , so I just have a script that runs between named and
> > ntpdate, and blocks waiting for access.
> >
> Those timing / start-order issues are getting more and more
> annoying, IMHO. On my PPPoE / mpd5 connected systems,
> it's the same problem:
> * openntpd (from ports) can't start, because named is not ready
> * pf can't parse /etc/pf.conf because the ng0 interface is not yet
> there etc, etc, etc...
>
> Isn't there a generic way to delay some scripts from starting
> until a specific subset is ready (say: networking fully up,
> and named ready to reply)? Perhaps some keyword or class
> to add to a startup script would be nice to have!
I don't think there's a generic solution, but I've pasted my own
script below, I think if you set "networkwait_ping_hosts" to a
name, rather than IP addresses, it might solve both your
problems. You'll be polling on dns, and then resyncing the pf rules.
$ cat /usr/local/etc/rc.d/networkwait
#!/bin/sh
#
# PROVIDE: networkwait
# REQUIRE: named
# BEFORE: ntpdate
. /etc/rc.subr
networkwait_enable=${networkwait_enable:-"NO"}
name="networkwait"
rcvar=`set_rcvar`
stop_cmd=":"
start_cmd="networkwait_start"
networkwait_start(){
if [ "$networkwait_ping_hosts" ] ; then
host_list="${networkwait_ping_hosts}"
else
# No hosts supplied - use external nameservers
host_list=`awk '/^ *nameserver/ {print $2}
'< /etc/resolv.conf | grep -E -v '^127\.0+\.0+\.0*1'`
fi
echo -n "Waiting for network access ... "
while true ; do
for inet_host in $host_list ; do
if ping -nc1 $inet_host 2>&1 > /dev/null ; then
echo "ping to ${inet_host} succeeded."
# Re-Sync ipfilter and pf in case
# they had failed DNS lookups
/etc/rc.d/ipfilter resync
/etc/rc.d/pf resync
exit 0
fi
done
sleep 5
done
}
load_rc_config ${name}
run_rc_command "$1"
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