Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On 10/29/2009 04:03 PM Dave wrote: On Thu, Oct 29, 2009 at 9:00 AM, Meenoo Shivdasani mee...@gmail.com mailto:mee...@gmail.com wrote: BOOTPROTO=bootp is triggering it. I'm confused. I just rebooted another machine with 'BOOTPROTO=bootp' in /etc/sysconfig/network-scripts/ifup-eth, it did not rewrite /etc/resolv.conf. I haven't followed the entire discussion, but do you have correct settings in /etc/sysconfig/networking/devices/ifcfg-eth0 (or whatever the NIC is) and the two relevant files in /etc/sysconfig/networking/profiles/default/ ?? hth, ken ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
ken wrote: On 10/29/2009 04:03 PM Dave wrote: On Thu, Oct 29, 2009 at 9:00 AM, Meenoo Shivdasani mee...@gmail.com mailto:mee...@gmail.com wrote: BOOTPROTO=bootp is triggering it. I'm confused. I just rebooted another machine with 'BOOTPROTO=bootp' in /etc/sysconfig/network-scripts/ifup-eth, it did not rewrite /etc/resolv.conf. I haven't followed the entire discussion, but do you have correct settings in /etc/sysconfig/networking/devices/ifcfg-eth0 (or whatever the NIC is) and the two relevant files in /etc/sysconfig/networking/profiles/default/ ?? hth, ken To add to Ken's answer... The setting is PEERDNS in the /etc/sysconfig/network-scripts/ifcfg-eth? file. If PEERDNS is set to yes then the resolv.conf file will be rewritten on every reboot. If set to no then the resolv.conf should not change. BTW, I have not read the OP's original post and basing my answer just on the subject line. Phil ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
The consensus of the list seemed to be that I should change the PEERDNS
variable. It seems not to be working. The machine rebooted yesterday,
/etc/resolv.conf got rewritten again. And yet:
find /etc/sysconfig/ -type f -exec grep -iH 'peerdns=' {} \;
/etc/sysconfig/network-scripts/ifcfg-eth0:PEERDNS=no
/etc/sysconfig/network-scripts/ifcfg-eth0.old:PEERDNS=yes
/etc/sysconfig/networking/profiles/default/ifcfg-eth0:PEERDNS=no
/etc/sysconfig/networking/devices/ifcfg-eth0:PEERDNS=no
# chkconfig --list|grep Net
NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off
# /etc/init.d/NetworkManager status
NetworkManager is stopped
# find /etc/sysconfig/ -type f -exec grep -iH 'bootproto=' {} \;
/etc/sysconfig/network-scripts/ifcfg-eth0:BOOTPROTO=none
/etc/sysconfig/network-scripts/ifcfg-eth0.old:BOOTPROTO=none
/etc/sysconfig/network-scripts/ifup-eth:BOOTPROTO=bootp
/etc/sysconfig/networking/profiles/default/ifcfg-eth0:BOOTPROTO=none
/etc/sysconfig/networking/devices/ifcfg-eth0:BOOTPROTO=none
# cat /etc/resolv.conf
; generated by /sbin/dhclient-script
search soest.hawaii.edu
nameserver 1...
nameserver 1...
So, it's not PEERDNS, not DHCP, not NetworkManager. Why is dhclient-script
even being run?
Maybe I should disable selinux altogether, instead of just making it
permissive? I think I'll try that.
# grep resol /sbin/dhclient-script
make_resolv_conf() {
save_previous /etc/resolv.conf
change_resolv_conf $rscf
for resolvfile in /etc/resolv.conf* ; do
/sbin/restorecon $resolvfile /dev/null 21
make_resolv_conf
if [ -f /etc/resolv.conf.predhclient.$interface ]; then
change_resolv_conf /etc/resolv.conf.predhclient.$interface
rm -f /etc/resolv.conf.predhclient.$interface
[r...@lee1 ~]# getenforce
Permissive
How badly would things blow up if I did this?
chmod a-w /etc/resolv.conf
mahalo,
Dave
On Thu, Oct 8, 2009 at 7:41 AM, Dave
tdbtdb+cen...@gmail.comtdbtdb%2bcen...@gmail.com
wrote:
My machine has a static IP, with dhcp and IPv6 disabled. Every time I
reboot, some process rewrites /etc/resolv.conf, including a comment
about dhcpclient. The only package I have installed that shows up in
rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in
there is named dhcpclient.
I'd like to figure out what software is rewriting this file and why.
man 5 resolv.conf and man resolver are unhelpful in this case. rpm
reports /etc/resolv.conf is not owned by any package.
At this point, I am as (or more) interested in pointers regarding how
to find the answer as I am in the actual answer. Please teach me to
fish.
mahalo,
Dave
--
———-
Q: Why should this email be 5 sentences or less?
A: http://five.sentenc.es
IPRC-help FAQ: https://wailua/wiki/index.php/Faq
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
/etc/sysconfig/network-scripts/ifup-eth: BOOTPROTO=bootp
So, it's not PEERDNS, not DHCP, not NetworkManager. Why is dhclient-script
even being run?
BOOTPROTO=bootp is triggering it.
In /etc/sysconfig/network-scripts/ifup-eth:
if [ ${BOOTPROTO} = bootp -o ${BOOTPROTO} = dhcp ]; then
DYNCONFIG=true
fi
Then, later on in that script:
if [ -n ${DYNCONFIG} -a -x /sbin/dhclient ]; then
do a bunch of stuff related to dynamically assigned addresses and names.
And finally:
if /sbin/dhclient ${DHCLIENTARGS} ${DEVICE} ; then
echo $ done.
else
Maybe I should disable selinux altogether, instead of just making it
permissive? I think I'll try that.
selinux shouldn't have anything to do with the resolv.conf file being
rewritten -- unless it's set to enforcing and something that isn't
allowed to do so is trying to rewrite the file.
HTH,
M
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 29, 2009 at 9:00 AM, Meenoo Shivdasani mee...@gmail.com wrote: BOOTPROTO=bootp is triggering it. I'm confused. I just rebooted another machine with 'BOOTPROTO=bootp' in /etc/sysconfig/network-scripts/ifup-eth, it did not rewrite /etc/resolv.conf. Okay, my goof, the one with the problem is actually running fc9. Sorry. I will try sed -i s/BOOTPROTO=bootp/BOOTPROTO=none/ /etc/sysconfig/network-scripts/ifup-eth mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. I'd like to figure out what software is rewriting this file and why. man 5 resolv.conf and man resolver are unhelpful in this case. rpm reports /etc/resolv.conf is not owned by any package. At this point, I am as (or more) interested in pointers regarding how to find the answer as I am in the actual answer. Please teach me to fish. mahalo, Dave Hi Is network-manager enabled? Regards mg. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Hi,
One option would be to comment out the make_resolv_conf() function in
/sbin/dhclient-script.
btw. a more common way would be to create a /etc/dhclient-enter-hooks
with the following content:
make_resolv_conf(){
:
}
Best Regards
Marcus
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: On Thu, Oct 8, 2009 at 11:44 AM, Craig White craigwh...@azapple.com wrote: On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 [snip] PEERDNS=yes - ^^^ change to PEERDNS=no What man page would tell me what this means? How should I have known that's what I should do, if I were lacking the luxury of being told by one wiser than myself? It's in /usr/share/doc/initscripts-version/sysconfig.txt Cheers frank ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
I haven't been following this thread very closely since my last post, but if you want to know who is doing what ... use auditctl. http://kbase.redhat.com/faq/docs/DOC-10108 Barry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 2:20 PM, Ray Van Dolson ra...@bludgeon.org wrote: On Thu, Oct 08, 2009 at 01:32:39PM -1000, Dave wrote: Wow, there it is. I guess I could've found it by doing a careful search of the initscripts package, which contains/owns /etc/sysconfig/network-scripts/ifcfg-eth0, which was the only script in /etc/ that invokes /sbin/dhclient, which a comment in /etc/resolv.conf revealed to be the program that wrote it. Just one of those things you kind of pick up as you go along and remember. Tribal knowledge if you will. Where exactly did you attempt to look first? man 5 resolv.conf Not saying it was smart. second try was rpm -qf /etc/resolv.conf on the theory that some package ought to own every config file and have some sort of documentation about the files it owns. Not much of a theory. I'm just trying to think of where a more obvious place to look would be first. Perhaps a man page documenting all the ifcfg type settings? man ifcfg? That would have taken me just as long as this process did, since I had no connection in my brain initially between resolv.conf and ifcfg. I think if there was an obvious good candidate, we would not be talking about this, I'd have found my answer right away on my own. I think Meenoo Shivdasani probably had the best idea, to google the message I found in my modified /etc/resolv.conf. best, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:40 PM, Marcelo M. Garcia marcelo.maia.gar...@googlemail.com wrote: Is network-manager enabled? No. Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 2:54 PM, Joseph L. Casale
jcas...@activenetwerx.com wrote:
Just one of those things you kind of pick up as you go along and
remember. Tribal knowledge if you will.
There's two pdf's and one command I use often :)
The redhat 5.3 deployment and installation pdf's (or the online versions)
That looks useful to know.
and:
# find /usr/share/doc/ -exec grep PEERDNS '{}' \; -print
PEERDNS=yes|no
file if PEERDNS is not set to no.
/usr/share/doc/initscripts-8.45.25/sysconfig.txt
honor PEERDNS=no for pump and dhcpcd too (#18619)
DEFROUTE defaults on; PEERDNS documented and defaults on
/usr/share/doc/initscripts-8.45.25/ChangeLog
Now you know what doc to read...
Yeah, but by the time I knew PEERDNS was involved, all the hard work
was done. Try that find command with 'resolv.conf' instead of PEERDNS
and you get way too many hits.
mahalo,
Dave
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 10:41 AM, Dave tdbtdb+cen...@gmail.com wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. I don't know that answer, but one workaround would be to maintain a backup copy of the file and initiate a late-boot service that replaces the rewritten one with the backup if they don't match. mhr ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 1:41 PM, Dave tdbtdb+cen...@gmail.com wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. Looks like the dhclient script is still being called. One option would be to comment out the make_resolv_conf() function in /sbin/dhclient-script. M ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Maybe it overwritten by NetworkManager? On Thu, Oct 8, 2009 at 9:41 PM, Dave tdbtdb+cen...@gmail.comtdbtdb%2bcen...@gmail.com wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. I'd like to figure out what software is rewriting this file and why. man 5 resolv.conf and man resolver are unhelpful in this case. rpm reports /etc/resolv.conf is not owned by any package. At this point, I am as (or more) interested in pointers regarding how to find the answer as I am in the actual answer. Please teach me to fish. mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Sergey Smirnov email/xmpp: sergey.a.smir...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 7:52 AM, Sergey Smirnov sergey.a.smir...@gmail.com wrote: Maybe it overwritten by NetworkManager? I almost wish. [root@ ~]# /etc/init.d/NetworkManager status NetworkManager is stopped [root@ ~]# chkconfig --list|grep Netw NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
I almost wish. Add a PEERDNS=no to your ifcfg file. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
about dhcpclient. The only package I have installed that shows up in It's called dhclient, so searching for dhcp won't give you a hit on that. chkconfig for dhclient too, and see what that results. Also, look at /etc/sysconfig/network-scripts/ifcfg-eth0. It's possible to have addresses statically assigned via DHCP based on MAC addresses. If resolv.conf is getting populated by dhclient, then I'm guessing the odds of you having a dhcp server on your network is good. :) In all likelihood, you have a static IP assigned in your ifcfg-eth0, and the resolv.conf is being over-written by dhclient. -- Spiro Harvey Knossos Networks Ltd 021-295-1923 www.knossos.net.nz signature.asc Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: On Thu, Oct 8, 2009 at 7:52 AM, Sergey Smirnov sergey.a.smir...@gmail.com wrote: Maybe it overwritten by NetworkManager? I almost wish. [root@ ~]# /etc/init.d/NetworkManager status NetworkManager is stopped [root@ ~]# chkconfig --list|grep Netw NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi Try adding PEERDNS=no to /etc/sysconfig/network :) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Meenoo Shivdasani wrote: One option would be to comment out the make_resolv_conf() function in /sbin/dhclient-script. That's the last-ditch solution. Never use it, unless everything else fails. -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in What happens when you do this: grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg-* -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Clint Dilks wrote: Try adding PEERDNS=no to /etc/sysconfig/network :) aw, man :) This is not fixing the leaking faucet. It's hammering the water pipe shut instead. -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. Is that dhcpclient, or dhclient? The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. What is the output of these commands? rpm -qa | grep dhc # to see what's actually installed as a package find / -name dhclient # to see if and where is the executable installed grep -rI dhclient /etc | grep -v selinux | grep -v /ifup-eth: \ | grep -v /ifdown-eth: # to see if it's called from somewhere else than the regular places -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
aw, man :) This is not fixing the leaking faucet. It's hammering the water pipe shut instead. Huh, what r u talking about? This is the right way to do this. Check the deployment docs on network scripts. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 9:49 AM, Spiro Harvey sp...@knossos.net.nz wrote: chkconfig for dhclient too, and see what that results. [root@ ~]# chkconfig --list|grep -e dh -e clie [root@ ~]# Also, look at /etc/sysconfig/network-scripts/ifcfg-eth0. [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes DHCP_HOSTNAME=[snip] DNS1=1[snip]0 DNS2=1[snip].2 NM_CONTROLLED=no SEARCH=[snip] NETMASK=255.255.255.0 DNS3=1[snip]0 GATEWAY=1[snip]0.1 TYPE=Ethernet USERCTL=no PEERDNS=yes IPV6INIT=no It's possible to have addresses statically assigned via DHCP based on MAC addresses. If resolv.conf is getting populated by dhclient, then I'm guessing the odds of you having a dhcp server on your network is good. :) You guessed right. But the question remains, what software is writing the file? In all likelihood, you have a static IP assigned in your ifcfg-eth0, and the resolv.conf is being over-written by dhclient. What is invoking dhclient, how do I find it? rpm -qR dhclient /bin/bash initscripts = 6.75 libc.so.6()(64bit) libc.so.6(GLIBC_2.2.5)(64bit) libc.so.6(GLIBC_2.3)(64bit) libc.so.6(GLIBC_2.3.4)(64bit) libc.so.6(GLIBC_2.4)(64bit) libc.so.6(GLIBC_2.8)(64bit) rpmlib(CompressedFileNames) = 3.0.4-1 rpmlib(PayloadFilesHavePrefix) = 4.0-1 rpmlib(VersionedDependencies) = 3.0.3-1 rtld(GNU_HASH) Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 10:10 AM, Florin Andrei flo...@andrei.myip.org wrote: What happens when you do this: grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg-* grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg-* /etc/sysconfig/network-scripts/ifcfg-eth0:BOOTPROTO=none Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
You guessed right. But the question remains, what software is writing the file? /etc/init.d/network calls /etc/sysconfig/network-scripts/ifup which calls /sbin/dhclient which calls /sbin/dhclient-script which overwrites your resolv.conf with the info it gets from the DHCP server on the network. M ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:27 AM, Meenoo Shivdasani mee...@gmail.com wrote:
/etc/init.d/network calls /etc/sysconfig/network-scripts/ifup which
calls /sbin/dhclient which calls /sbin/dhclient-script which
overwrites your resolv.conf with the info it gets from the DHCP server
on the network.
How would I find this out on my own? And it seems not to be correct.
At least, if /etc/sysconfig/network-scripts/ifup calls
/sbin/dhclient, it must use some indirection, as dhclient is not
mentioned in the script explicitly:
grep -i dhc /etc/sysconfig/network-scripts/ifup
if [ ${BOOTPROTO} = bootp -o ${BOOTPROTO} = dhcp ]; then
Why does it overwrite /etc/resolv.conf when the machine is not set to
use DHCP? The IP address etc. is set statically using
/usr/bin/system-config-network.
Dave
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Joseph L. Casale wrote: aw, man :) This is not fixing the leaking faucet. It's hammering the water pipe shut instead. Huh, what r u talking about? This is the right way to do this. Check the deployment docs on network scripts. Yes, I know the docs. What I was saying is - it will not help finding the cause, which is what the OP requested. It will just make the problem go away. -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: On Thu, Oct 8, 2009 at 9:49 AM, Spiro Harvey sp...@knossos.net.nz wrote: chkconfig for dhclient too, and see what that results. [root@ ~]# chkconfig --list|grep -e dh -e clie [root@ ~]# Also, look at /etc/sysconfig/network-scripts/ifcfg-eth0. [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes DHCP_HOSTNAME=[snip] DNS1=1[snip]0 DNS2=1[snip].2 NM_CONTROLLED=no SEARCH=[snip] NETMASK=255.255.255.0 DNS3=1[snip]0 GATEWAY=1[snip]0.1 TYPE=Ethernet USERCTL=no PEERDNS=yes - ^^^ change to PEERDNS=no Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Yes, I know the docs. What I was saying is - it will not help finding the cause, which is what the OP requested. It will just make the problem go away. Uhm, am I missing something? It *is* the cause? Its designed to do just what it's doing, and here's a real shocker, it's doing it:) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:44 AM, Craig White craigwh...@azapple.com wrote: On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 [snip] PEERDNS=yes - ^^^ change to PEERDNS=no What man page would tell me what this means? How should I have known that's what I should do, if I were lacking the luxury of being told by one wiser than myself? rpm -qf /etc/sysconfig/network-scripts/ifcfg-eth0 file /etc/sysconfig/network-scripts/ifcfg-eth0 is not owned by any package man ifcfg No manual entry for ifcfg man ifcfg-eth0 No manual entry for ifcfg-eth0 mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 10:29 AM, Florin Andrei flo...@andrei.myip.org wrote:
What is the output of these commands?
rpm -qa | grep dhc
# to see what's actually installed as a package
rpm -qa | grep dhc
dhcpv6-client-1.0.14-1.fc9.x86_64
libdhcp4client-4.0.0-22.fc9.x86_64
libdhcp6client-1.0.14-1.fc9.x86_64
libdhcp-1.99.8-1.fc9.x86_64
dhclient-4.0.0-22.fc9.x86_64
find / -name dhclient
# to see if and where is the executable installed
I hope this is an acceptable substitute:
rpm -qfs /sbin/dhclient
normal/sbin/dhclient
normal/sbin/dhclient-script
normal/usr/share/doc/dhclient-4.0.0
normal/usr/share/doc/dhclient-4.0.0/dhclient.conf.sample
normal/usr/share/man/man5/dhclient.conf.5.gz
normal/usr/share/man/man5/dhclient.leases.5.gz
normal/usr/share/man/man5/dhcp-eval.5.gz
normal/usr/share/man/man5/dhcp-options.5.gz
normal/usr/share/man/man8/dhclient-script.8.gz
normal/usr/share/man/man8/dhclient.8.gz
normal/var/lib/dhclient
grep -rI dhclient /etc | grep -v selinux | grep -v /ifup-eth: \
| grep -v /ifdown-eth:
# to see if it's called from somewhere else than the regular places
Substituting:
find /etc -type f -exec grep -iH dhclient {} \; | grep -v selinux
/etc/bluetooth/network.conf:Script=dhclient
/etc/rwtab:empty/var/lib/dhclient
/etc/resolv.conf.save:; generated by /sbin/dhclient-script
/etc/sysconfig/network-scripts/ifdown-eth:[ -n `pidof -x dhclient` ] {
/etc/sysconfig/network-scripts/ifdown-eth: if [ -f
/var/run/dhclient-${DEVICE}.pid ]; then
/etc/sysconfig/network-scripts/ifdown-eth: dhcpid=`cat
/var/run/dhclient-${DEVICE}.pid`
/etc/sysconfig/network-scripts/ifdown-eth:
/sbin/dhclient -r -lf /var/lib/dhclient/dhclient-${DEVICE}.leases -pf
/var/run/dhclient-${DEVICE}.pid ${DEVICE} /dev/null 21
/etc/sysconfig/network-scripts/ifdown-eth:
reason=STOP interface=${DEVICE} /sbin/dhclient-script
/etc/sysconfig/network-scripts/ifdown-eth: if [ -f
/var/run/dhclient-${DEVICE}.pid ]; then
/etc/sysconfig/network-scripts/ifdown-eth: rm -f
/var/run/dhclient-${DEVICE}.pid
/etc/sysconfig/network-scripts/ifup-eth:if [ -n ${DYNCONFIG} -a -x
/sbin/dhclient ]; then
/etc/sysconfig/network-scripts/ifup-eth:# Remove any temporary
references which were previously added to dhclient config
/etc/sysconfig/network-scripts/ifup-eth:if [ -w
/etc/dhclient-${DEVICE}.conf ] ; then
/etc/sysconfig/network-scripts/ifup-eth:LC_ALL=C grep -v #
temporary RHL ifup addition /etc/dhclient-${DEVICE}.conf
/etc/dhclient-${DEVICE}.conf.ifupnew 2 /dev/null
/etc/sysconfig/network-scripts/ifup-eth:cat
/etc/dhclient-${DEVICE}.conf.ifupnew /etc/dhclient-${DEVICE}.conf
/etc/sysconfig/network-scripts/ifup-eth:rm -f
/etc/dhclient-${DEVICE}.conf.ifupnew
/etc/sysconfig/network-scripts/ifup-eth:if [[
${PERSISTENT_DHCLIENT} = [yY1]* ]]; then
/etc/sysconfig/network-scripts/ifup-eth: if [ -w
/etc/dhclient-${DEVICE}.conf ] ; then
/etc/sysconfig/network-scripts/ifup-eth: if ! LC_ALL=C grep
send *host-name *\${DHCP_HOSTNAME}\ /etc/dhclient-${DEVICE}.conf
/dev/null 21 ; then
/etc/sysconfig/network-scripts/ifup-eth: echo send
host-name \${DHCP_HOSTNAME}\; # temporary RHL ifup addition
/etc/dhclient-${DEVICE}.conf
/etc/sysconfig/network-scripts/ifup-eth: elif ! [ -e
/etc/dhclient-${DEVICE}.conf ] ; then
/etc/sysconfig/network-scripts/ifup-eth: echo send
host-name \${DHCP_HOSTNAME}\; # temporary RHL ifup addition
/etc/dhclient-${DEVICE}.conf
/etc/sysconfig/network-scripts/ifup-eth:# allow users to use
generic '/etc/dhclient.conf' (as documented in manpage!)
/etc/sysconfig/network-scripts/ifup-eth:if [ -s
/etc/dhclient-${DEVICE}.conf ]; then
/etc/sysconfig/network-scripts/ifup-eth: DHCLIENTCONF=-cf
/etc/dhclient-${DEVICE}.conf;
/etc/sysconfig/network-scripts/ifup-eth: DHCLIENTCONF='';
/etc/sysconfig/network-scripts/ifup-eth:if [ -f
/dev/.dhclient-${DEVICE}.leases ] ; then
/etc/sysconfig/network-scripts/ifup-eth:mv -f
/dev/.dhclient-${DEVICE}.leases
/var/lib/dhclient/dhclient-${DEVICE}.leases
/etc/sysconfig/network-scripts/ifup-eth:[ -x /sbin/restorecon
] restorecon /var/lib/dhclient/dhclient-${DEVICE}.leases
/dev/null 21
/etc/sysconfig/network-scripts/ifup-eth:
DHCLIENTARGS=${DHCLIENTARGS} ${ONESHOT} -q ${DHCLIENTCONF} -lf
/var/lib/dhclient/dhclient-${DEVICE}.leases -pf
/var/run/dhclient-${DEVICE}.pid
/etc/sysconfig/network-scripts/ifup-eth:if [[
${PERSISTENT_DHCLIENT} != [yY1]* ]] check_link_down ${DEVICE};
then
/etc/sysconfig/network-scripts/ifup-eth:if /sbin/dhclient
${DHCLIENTARGS} ${DEVICE} ; then
/etc/sudoers:Cmnd_Alias NETWORKING = /sbin/route, /sbin/ifconfig,
/bin/ping, /sbin/dhclient, /usr/bin/net, /sbin/iptables,
/usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool
Script=dhclient looks interesting, but that's for bluetooth?
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes DHCP_HOSTNAME=[snip] DNS1=1[snip]0 DNS2=1[snip].2 NM_CONTROLLED=no SEARCH=[snip] NETMASK=255.255.255.0 DNS3=1[snip]0 GATEWAY=1[snip]0.1 TYPE=Ethernet USERCTL=no PEERDNS=yes IPV6INIT=no Holy cow, something put every single option in that file. For static address, the minimum you need is this: DEVICE=eth0 BOOTPROTO=none HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes NETMASK=255.255.255.0 TYPE=Ethernet And you can either leave GATEWAY there or put it in /etc/sysconfig/network I assume it's because of PEERDNS=yes, and you'll have to try to be sure, but anyway all that junk serves no purpose there (well, arguably you could put back USERCTL and stuff like that, if you really need it). -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Quoting Dave tdbtdb+cen...@gmail.com: On Thu, Oct 8, 2009 at 11:44 AM, Craig White craigwh...@azapple.com wrote: On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 [snip] PEERDNS=yes - ^^^ change to PEERDNS=no What man page would tell me what this means? How should I have known that's what I should do, if I were lacking the luxury of being told by one wiser than myself? /usr/share/doc/initscripts-*/sysconfig.txt ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 5:39 PM, Dave tdbtdb+cen...@gmail.com wrote: On Thu, Oct 8, 2009 at 11:27 AM, Meenoo Shivdasani mee...@gmail.com wrote: /etc/init.d/network calls /etc/sysconfig/network-scripts/ifup which calls /sbin/dhclient which calls /sbin/dhclient-script which overwrites your resolv.conf with the info it gets from the DHCP server on the network. And it seems not to be correct. At least, if /etc/sysconfig/network-scripts/ifup calls /sbin/dhclient, it must use some indirection, as dhclient is not mentioned in the script explicitly: My bad -- on the 4.x system I referred to, ifup is where it's called. On my 5.x system, it's called by ifup-eth. Why does it overwrite /etc/resolv.conf when the machine is not set to use DHCP? The IP address etc. is set statically using /usr/bin/system-config-network. Are there any interfaces that have BOOTPROTO=dhcp? Perhaps one that's not connected to the network? grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg* How would I find this out on my own? That's a harder one to answer. I would start with the comment that got added to the resolv.conf file -- and Google resolv.conf dhclient. That brings up hits that describe several ways of avoiding the whole issue (and confirms for you that you're on the right track). man dhclient mentions dhclient-script, then poking around in various etc directories gets you to where it gets called from. Making the leap to figuring out that PEERDNS is one of the ways that you can control whether or not resolv.conf gets modified would mean looking through the various definitions in ifcfg-eth0 and making sure that you know what each one does. When you hit one that you don't recognize, look it up. In this case: PEERDNS=answer, where answer is one of the following: yes — Modify /etc/resolv.conf if the DNS directive is set. If using DCHP, then yes is the default. no — Do not modify /etc/resolv.conf. M ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Joseph L. Casale wrote: Yes, I know the docs. What I was saying is - it will not help finding the cause, which is what the OP requested. It will just make the problem go away. Uhm, am I missing something? It *is* the cause? Its designed to do just what it's doing, and here's a real shocker, it's doing it:) Take a step back and look at the whole picture. Your suggestion will override a DHCP-related config item somewhere else. Yes, it will likely stop the system from over-writing resolv.conf - in that, you are correct. No, it will not satisfy the requirement of the the o.p. which was, I quote: At this point, I am as (or more) interested in pointers regarding how to find the answer as I am in the actual answer. Please teach me to fish. What I'm trying to do here is to help the o.p. to find what causes the modification of resolv.conf, not how to cover up the issue. It's easy to hide the problem, either do what you suggest, or edit away make_resolv_conf(). But the underlying cause will remain, and may resurface if these changes are undone. -- Florin Andrei http://florin.myip.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:50 AM, Dave tdbtdb+cen...@gmail.com wrote:
On Thu, Oct 8, 2009 at 10:29 AM, Florin Andrei flo...@andrei.myip.org wrote:
What is the output of these commands?
rpm -qa | grep dhc
# to see what's actually installed as a package
rpm -qa | grep dhc
dhcpv6-client-1.0.14-1.fc9.x86_64
libdhcp4client-4.0.0-22.fc9.x86_64
libdhcp6client-1.0.14-1.fc9.x86_64
libdhcp-1.99.8-1.fc9.x86_64
dhclient-4.0.0-22.fc9.x86_64
find / -name dhclient
# to see if and where is the executable installed
I hope this is an acceptable substitute:
rpm -qfs /sbin/dhclient
normal /sbin/dhclient
normal /sbin/dhclient-script
normal /usr/share/doc/dhclient-4.0.0
normal /usr/share/doc/dhclient-4.0.0/dhclient.conf.sample
normal /usr/share/man/man5/dhclient.conf.5.gz
normal /usr/share/man/man5/dhclient.leases.5.gz
normal /usr/share/man/man5/dhcp-eval.5.gz
normal /usr/share/man/man5/dhcp-options.5.gz
normal /usr/share/man/man8/dhclient-script.8.gz
normal /usr/share/man/man8/dhclient.8.gz
normal /var/lib/dhclient
grep -rI dhclient /etc | grep -v selinux | grep -v /ifup-eth: \
| grep -v /ifdown-eth:
# to see if it's called from somewhere else than the regular places
Substituting:
find /etc -type f -exec grep -iH dhclient {} \; | grep -v selinux
[snip]
/etc/sysconfig/network-scripts/ifup-eth:if [ -n ${DYNCONFIG} -a -x
/sbin/dhclient ]; then
/etc/sysconfig/network-scripts/ifup-eth: # Remove any temporary
references which were previously added to dhclient config
[snip]
Previous poster Meenoo Shivdasani was close, looks like it is
/etc/sysconfig/network-scripts/ifup-eth (not
/etc/sysconfig/network-scripts/ifup) that invokes dhclient.
Dave
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
At Thu, 8 Oct 2009 07:41:33 -1000 CentOS mailing list centos@centos.org wrote: My machine has a static IP, with dhcp and IPv6 disabled. Every time I reboot, some process rewrites /etc/resolv.conf, including a comment about dhcpclient. The only package I have installed that shows up in rpm -qa|grep -i dhcp is dhcpv6-client-1.0.10-16.el5, and nothing in there is named dhcpclient. I'd like to figure out what software is rewriting this file and why. man 5 resolv.conf and man resolver are unhelpful in this case. rpm reports /etc/resolv.conf is not owned by any package. At this point, I am as (or more) interested in pointers regarding how to find the answer as I am in the actual answer. Please teach me to fish. Is NetworkManager running? If so, stop it: sudo /sbin/service NetworkManager stop and disable it: sudo /sbin/chkconfig NetworkManager off mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Robert Heller -- 978-544-6933 Deepwoods Software-- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows hel...@deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
At Thu, 08 Oct 2009 14:54:36 -0700 CentOS mailing list centos@centos.org wrote: Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes DHCP_HOSTNAME=[snip] DNS1=1[snip]0 DNS2=1[snip].2 NM_CONTROLLED=no SEARCH=[snip] NETMASK=255.255.255.0 DNS3=1[snip]0 GATEWAY=1[snip]0.1 TYPE=Ethernet USERCTL=no PEERDNS=yes IPV6INIT=no Holy cow, something put every single option in that file. For static address, the minimum you need is this: DEVICE=eth0 BOOTPROTO=none Shouldn't that be: BOOTPROTO=static HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes NETMASK=255.255.255.0 TYPE=Ethernet And you can either leave GATEWAY there or put it in /etc/sysconfig/network I assume it's because of PEERDNS=yes, and you'll have to try to be sure, but anyway all that junk serves no purpose there (well, arguably you could put back USERCTL and stuff like that, if you really need it). -- Robert Heller -- 978-544-6933 Deepwoods Software-- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows hel...@deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
At Thu, 8 Oct 2009 11:19:18 -1000 CentOS mailing list centos@centos.org wrote: On Thu, Oct 8, 2009 at 9:49 AM, Spiro Harvey sp...@knossos.net.nz wrote: chkconfig for dhclient too, and see what that results. [root@ ~]# chkconfig --list|grep -e dh -e clie [root@ ~]# Also, look at /etc/sysconfig/network-scripts/ifcfg-eth0. [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none BOOTPROTO=static HWADDR=00:18:8b:0f:ad:c2 IPADDR=1[snip]0 ONBOOT=yes DHCP_HOSTNAME=[snip] ??? DNS1=1[snip]0 DNS2=1[snip].2 ??? NM_CONTROLLED=no SEARCH=[snip] NETMASK=255.255.255.0 DNS3=1[snip]0 ??? GATEWAY=1[snip]0.1 TYPE=Ethernet USERCTL=no PEERDNS=yes ??? IPV6INIT=no It's possible to have addresses statically assigned via DHCP based on MAC addresses. If resolv.conf is getting populated by dhclient, then I'm guessing the odds of you having a dhcp server on your network is good. :) You guessed right. But the question remains, what software is writing the file? In all likelihood, you have a static IP assigned in your ifcfg-eth0, and the resolv.conf is being over-written by dhclient. What is invoking dhclient, how do I find it? rpm -qR dhclient /bin/bash initscripts = 6.75 libc.so.6()(64bit) libc.so.6(GLIBC_2.2.5)(64bit) libc.so.6(GLIBC_2.3)(64bit) libc.so.6(GLIBC_2.3.4)(64bit) libc.so.6(GLIBC_2.4)(64bit) libc.so.6(GLIBC_2.8)(64bit) rpmlib(CompressedFileNames) = 3.0.4-1 rpmlib(PayloadFilesHavePrefix) = 4.0-1 rpmlib(VersionedDependencies) = 3.0.3-1 rtld(GNU_HASH) Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Robert Heller -- 978-544-6933 Deepwoods Software-- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows hel...@deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 1:04 PM, Robert Heller hel...@deepsoft.com wrote: Is NetworkManager running? If so, stop it: /etc/init.d/NetworkManager status NetworkManager is stopped mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:57 AM, Barry Brimer li...@brimer.org wrote: Quoting Dave tdbtdb+cen...@gmail.com: On Thu, Oct 8, 2009 at 11:44 AM, Craig White craigwh...@azapple.com wrote: On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 [snip] PEERDNS=yes - ^^^ change to PEERDNS=no What man page would tell me what this means? How should I have known that's what I should do, if I were lacking the luxury of being told by one wiser than myself? /usr/share/doc/initscripts-*/sysconfig.txt Wow, there it is. I guess I could've found it by doing a careful search of the initscripts package, which contains/owns /etc/sysconfig/network-scripts/ifcfg-eth0, which was the only script in /etc/ that invokes /sbin/dhclient, which a comment in /etc/resolv.conf revealed to be the program that wrote it. Thanks guys, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 1:04 PM, Robert Heller hel...@deepsoft.com wrote: At Thu, 08 Oct 2009 14:54:36 -0700 CentOS mailing list centos@centos.org wrote: Dave wrote: BOOTPROTO=none Shouldn't that be: BOOTPROTO=static My options (according to /usr/share/doc/initscripts-8.76.4/sysconfig.txt) are: BOOTPROTO=none|bootp|dhcp This was all set by the network panel (/usr/bin/system-config-network). I have an embarrassing admission to make - I just realized the system I was looking at is running fedora 9. I've noticed the same behavior on my centos systems, though. Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 11:57 AM, Meenoo Shivdasani mee...@gmail.com wrote: Are there any interfaces that have BOOTPROTO=dhcp? Perhaps one that's not connected to the network? grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg* grep BOOTPROTO /etc/sysconfig/network-scripts/ifcfg* /etc/sysconfig/network-scripts/ifcfg-eth0:BOOTPROTO=none mahalo, Dave ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 08, 2009 at 01:32:39PM -1000, Dave wrote: On Thu, Oct 8, 2009 at 11:57 AM, Barry Brimer li...@brimer.org wrote: Quoting Dave tdbtdb+cen...@gmail.com: On Thu, Oct 8, 2009 at 11:44 AM, Craig White craigwh...@azapple.com wrote: On Thu, 2009-10-08 at 11:19 -1000, Dave wrote: [r...@lee1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 [snip] PEERDNS=yes - ^^^ change to PEERDNS=no What man page would tell me what this means? How should I have known that's what I should do, if I were lacking the luxury of being told by one wiser than myself? /usr/share/doc/initscripts-*/sysconfig.txt Wow, there it is. I guess I could've found it by doing a careful search of the initscripts package, which contains/owns /etc/sysconfig/network-scripts/ifcfg-eth0, which was the only script in /etc/ that invokes /sbin/dhclient, which a comment in /etc/resolv.conf revealed to be the program that wrote it. Just one of those things you kind of pick up as you go along and remember. Tribal knowledge if you will. Where exactly did you attempt to look first? I'm just trying to think of where a more obvious place to look would be first. Perhaps a man page documenting all the ifcfg type settings? man ifcfg? Ray ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
Just one of those things you kind of pick up as you go along and
remember. Tribal knowledge if you will.
There's two pdf's and one command I use often :)
The redhat 5.3 deployment and installation pdf's (or the online versions)
and:
# find /usr/share/doc/ -exec grep PEERDNS '{}' \; -print
PEERDNS=yes|no
file if PEERDNS is not set to no.
/usr/share/doc/initscripts-8.45.25/sysconfig.txt
honor PEERDNS=no for pump and dhcpcd too (#18619)
DEFROUTE defaults on; PEERDNS documented and defaults on
/usr/share/doc/initscripts-8.45.25/ChangeLog
Now you know what doc to read...
Also:
man -K PEERDNS
But that's generally a slow and last ditch effort even after google:)
It also never helped with this string but its useful to know.
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Fri, 2009-10-09 at 00:54 +, Joseph L. Casale wrote: snip Also: man -K PEERDNS But that's generally a slow and last ditch effort even after google:) It also never helped with this string but its useful to know. And don't forget to run makewhatis occasionally (if not automatically done) so that the man -k and apropos have a current database to search. snip sig stuff -- Bill ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] resolv.conf rewritten every reboot. How to figure out who and why?
On Thu, Oct 8, 2009 at 4:39 PM, Dave tdbtdb+cen...@gmail.com wrote:
On Thu, Oct 8, 2009 at 11:27 AM, Meenoo Shivdasani mee...@gmail.com wrote:
/etc/init.d/network calls /etc/sysconfig/network-scripts/ifup which
calls /sbin/dhclient which calls /sbin/dhclient-script which
overwrites your resolv.conf with the info it gets from the DHCP server
on the network.
How would I find this out on my own? And it seems not to be correct.
At least, if /etc/sysconfig/network-scripts/ifup calls
/sbin/dhclient, it must use some indirection, as dhclient is not
mentioned in the script explicitly:
grep -i dhc /etc/sysconfig/network-scripts/ifup
if [ ${BOOTPROTO} = bootp -o ${BOOTPROTO} = dhcp ]; then
Why does it overwrite /etc/resolv.conf when the machine is not set to
use DHCP? The IP address etc. is set statically using
/usr/bin/system-config-network.
Dave
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
i feel the pain as i went through this just last night on a multihomed
CentOS 5.3 box. It was using old and wrong lease info which helped me
notice it as a problem.
i ended up deleting:
/var/lib/dhcpd/dhclient.leases
/var/lib/dhcpd/dhclient.leases~
/etc/dhclient.conf (but you should make a backup or at least look at
the dhclient.conf because i think you can tell it what ethX to work on
or not).
rm anything else associated with dhclient
Some guys say to uninstall NetworkManager, not just keep it from running.
Setting a static dhcp lease in our separate dhcpd server you would
think would fix this. But static lease made things worse because
dhclient broke /etc/sysconfig/network-scripts/ifup-routes calls to
'/sbin/ip/route add and /sbin/ip/rule add. With dhclient, i could
not set a default gw rule for each different network interface card.
After deleting the lease info and maybe changing the
/etc/dhclient.conf and then deleting it, i could have a separate
default gateway for each nic.
Ok, the other BUG is ping. There is a bug in ping that has sucked up
much of my life for the last 2 or 3 years. i will post separately on
the ping -I bug.
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
