not being able to save changes in /etc/resolv.conf

b0nd · 03-03-2006, 08:05 PM

Hello all,
I'm used to of vi editor.
But after making changes in /etc/resolv.conf, they are available till i don't reboot the system or i do not restart the network services (/etc/rc.d/rc.inet1 stop...../etc/rc.d/rc.inet1 start)

what could be the problem ???

regards

chakkerz · 03-03-2006, 08:57 PM

a bunch of things. 1) you are editing the file without write permissions (which means you get an error trying to save). 2) your rc scripts regenerate the resolv.conf at boot time (unlikely) ... what is the last time the file was changed? if it is during reboot, run a

grep -R resolv.conf /etc/*

and see if anything pipes to the file, or copies over it.

detpenguin · 03-03-2006, 09:05 PM

i had the same problem...this thread may help you out. it's how i fixed mine.

b0nd · 03-03-2006, 10:47 PM

Quote:

Originally Posted by chakkerz

a bunch of things. 1) you are editing the file without write permissions (which means you get an error trying to save). 2) your rc scripts regenerate the resolv.conf at boot time (unlikely) ... what is the last time the file was changed? if it is during reboot, run a

grep -R resolv.conf /etc/*

and see if anything pipes to the file, or copies over it.

hi,
here is the output....but i can't understand whether some script is writing /etc/resolv.conf or not

Quote:

root@bond:~# grep -R resolv.conf /etc/*
/etc/dnsmasq.conf:# somewhere other that /etc/resolv.conf
/etc/dnsmasq.conf:# /etc/resolv.conf
/etc/dnsmasq.conf:# If you don't want dnsmasq to read /etc/resolv.conf or any other
/etc/dnsmasq.conf:# If you don't want dnsmasq to poll /etc/resolv.conf or other resolv
/etc/dnsmasq.conf:# dnsmasq to read /etc/ppp/resolv.conf since dnsmasq now uses the
/etc/mutt/Muttrc:# /etc/resolv.conf.
/etc/pcmcia/network.opts: # Things to add to /etc/resolv.conf for this interface
/etc/pcmcia/network:RESOLV=/etc/resolv.conf
/etc/pcmcia/network: if [ -e /etc/dhcpc/resolv.conf ] ; then
/etc/pcmcia/network: cat /etc/dhcpc/resolv.conf >> $RESOLV.N
/etc/rc.d/rc.yp:# # the same as your DNS domainname, set in /etc/resolv.conf. The NIS
root@bond:~#

As "detpenguin" adviced i added '-R'

Quote:

echo "/etc/rc.d/rc.inet1: /sbin/dhcpcd -d -t 10 -h ${DHCP_HOSTNAME[$1]} eth${1}" | $LOGGER
/sbin/dhcpcd -d -t 10 -h ${DHCP_HOSTNAME[$1]} eth${1} -R
else
echo "/etc/rc.d/rc.inet1: /sbin/dhcpcd -d -t 10 eth${1}" | $LOGGER
/sbin/dhcpcd -d -t 10 eth${1} -R
fi

now i made changes to /etc/resolv.conf and removed the entry of one DNS.
rebooted the machine.
#cat /etc/resolv.conf ......was fine

but when i connected the machine to internet (#pppoe-start) and checked the /etc/resolv.conf again.....old entries appeared.

what should i do now ???

regards

gbonvehi · 03-03-2006, 11:30 PM

Your "problem" is this from /usr/sbin/pppoe-connect (called by pppoe-start):

Code:

# Jigger DNS if required...
if test "$DNSTYPE" = "SERVER" ; then
    # Sorry, dude...
    rm -f /etc/resolv.conf
    ln -s /etc/ppp/resolv.conf /etc/resolv.conf
elif test "$DNSTYPE" = "SPECIFY" ; then
    # Sorry, dude...
    rm -f /etc/resolv.conf
    echo "nameserver $DNS1" > /etc/resolv.conf
    if test -n "$DNS2" ; then
	echo "nameserver $DNS2" >> /etc/resolv.conf
    fi
fi

Change in /etc/ppp/pppoe.conf this stuff:

Code:

# DNS type: SERVER=obtain from server; SPECIFY=use DNS1 and DNS2;
# NOCHANGE=do not adjust.
DNSTYPE=SPECIFY

# Obtain DNS server addresses from the peer (recent versions of pppd only)
# In old config files, this used to be called USEPEERDNS.  Changed to
# PEERDNS for better Red Hat compatibility
PEERDNS=yes

DNS1=
DNS2=

Put your dns servers in DNS1 and DNS2

Or, instead of editing it manually, use pppoe-setup again, and choose to specify DNS servers.

chakkerz · 03-03-2006, 11:43 PM

gbonvehi looks like he got the answer ... that has a lot of potential i think.

So take a look at his solution. If that doesn't work out, then i would consider looking at those two lines you found in your /etc:

/etc/pcmcia/network: if [ -e /etc/dhcpc/resolv.conf ] ; then
/etc/pcmcia/network: cat /etc/dhcpc/resolv.conf >> $RESOLV.N

b0nd · 03-03-2006, 11:48 PM

Thanks gbonvehi.
It worked.

i edited the file /etc/ppp/pppoe.conf and replaced the old DNS with a new one.

regards