This is a discussion on RE: Number of CPUs detected by Bind 9.4.2 on 4 CPU system running RedHat es 4. - DNS ; I'm sorry but doesn't this risk someone getting into your chroot environment and changing your SCSI setup or other things which is done by echoing things into /proc/scsi/...? If it's really required should it be a read only mount? The ...
I'm sorry but doesn't this risk someone getting into your chroot
environment and changing your SCSI setup or other things which is done
by echoing things into /proc/scsi/...? If it's really required should
it be a read only mount? The whole point of chroot is to limit what
can be accessed if the chroot environment is compromised. Giving direct
access to something like /proc seems counterintuitive to me.
I feel I'm missing something important here.
From: email@example.com [mailto:firstname.lastname@example.org] On
Behalf Of greg kuechle
Sent: Tuesday, April 01, 2008 11:09 AM
To: Adam Tkac
Subject: Re: Number of CPUs detected by Bind 9.4.2 on 4 CPU system
running RedHat es 4.
On Tue, Apr 1, 2008 at 6:23 AM, Adam Tkac
> On Mon, Mar 31, 2008 at 11:59:10AM -0600, greg kuechle wrote:
> > Hello,
> > I have install bind 9.4.2 on a system with 4 CPUs running RedHat
> > compiled named with the --enable-threads and used the -n 4 flag
> > start named.
> > Mar 31 10:12:24 ******** named: starting BIND 9.4.2 -t
> > -u named -n 4 -c /etc/named.conf
> > Mar 31 16:12:24 ******** named: found 1 CPU, using 4 worker
> > Before I upgraded the system it was running an older version of
> > comes packaged with the OS.
> > Here is the output from the logfile.
> > Mar 24 11:34:13 ******** named: starting BIND 9.2.4
> > Mar 24 11:34:13 ******** named: using 4 CPUs
> > Did I compile named wrong?
> > Will BIND 9.4.2 use all of the CPUs if I use the -n 4 option at
> > It looks like named is only running on one CPU. Will named start
> > other CPUs once one CPU is up to 100% ?
> > Thank you for any help.
> I think you forgot mount /proc filesystem into chroot. You can try it
> with /proc mounted in chroot (for example $mount --bind /proc
> Adam Tkac, Red Hat, Inc.
Thank you Adam,
That did the trick. I mounted /proc in chroot and restarted named.
I am still using the -n 4 switch. The log output is:
Apr 1 14:01:58 dnsserver-1 named: found 4 CPUs, using 4 worker
When I run a ps -ef | grep name I only see one named process running. Is
this correct ?
I thought I would see 4 running.
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