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From 5bc318633fdf2c5bfea88bf2cf03e5aac2e78a1d Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Wed, 29 Jun 2016 17:26:17 +0200
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Subject: [PATCH] network: dhcp before parsing specified dns through cmdline
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I met a problem when passing kdump dns to dracut via "nameserver=x.x.x.x",
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the dns I provided didn't appear in the "/etc/resolv.conf".
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After some debugging, found that when setup dhcp DNS, in setup_interface()
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and setup_interface6(), it has:
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echo "search $search $domain" > /tmp/net.$netif.resolv.conf
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So if "$search $domain" isn't NULL(this is ture in my kdump environment),
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the dns contents(that is, dns1, dns2, nameserver) in "ifup" before dhcp
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will be discarded.
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This patch addresses it by handling dhcp first. In fact this is also the
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way the NetworkManager in 1st kernel works.
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Signed-off-by: Xunlei Pang <xlpang@redhat.com>
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cherry-pick of commit cf376023e6d0d4abd9816fa954bb917fc2557713
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---
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modules.d/40network/ifup.sh | 31 +++++++++++++++----------------
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1 file changed, 15 insertions(+), 16 deletions(-)
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diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
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index 37f51b9d..19b7bbdc 100755
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--- a/modules.d/40network/ifup.sh
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+++ b/modules.d/40network/ifup.sh
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@@ -350,16 +350,15 @@ fi
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ip=$(getarg ip)
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if [ -z "$ip" ]; then
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- for s in $(getargs nameserver); do
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- [ -n "$s" ] || continue
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- echo nameserver $s >> /tmp/net.$netif.resolv.conf
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- done
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-
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if [ "$netroot" = "dhcp6" ]; then
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do_dhcp -6
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else
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do_dhcp -4
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fi
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+ for s in $(getargs nameserver); do
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+ [ -n "$s" ] || continue
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+ echo nameserver $s >> /tmp/net.$netif.resolv.conf
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+ done
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fi
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@@ -386,17 +385,6 @@ for p in $(getargs ip=); do
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[ "$use_bridge" != 'true' ] && \
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[ "$use_vlan" != 'true' ] && continue
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- # setup nameserver
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- for s in "$dns1" "$dns2" $(getargs nameserver); do
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- [ -n "$s" ] || continue
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- echo nameserver $s >> /tmp/net.$netif.resolv.conf
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- done
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-
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- # Store config for later use
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- for i in ip srv gw mask hostname macaddr dns1 dns2 mtu; do
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- eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
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- done > /tmp/net.$netif.override
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-
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for autoopt in $(str_replace "$autoconf" "," " "); do
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case $autoopt in
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dhcp|on|any)
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@@ -412,6 +400,17 @@ for p in $(getargs ip=); do
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done
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ret=$?
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+ # setup nameserver
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+ for s in "$dns1" "$dns2" $(getargs nameserver); do
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+ [ -n "$s" ] || continue
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+ echo nameserver $s >> /tmp/net.$netif.resolv.conf
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+ done
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+
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+ # Store config for later use
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+ for i in ip srv gw mask hostname macaddr dns1 dns2 mtu; do
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+ eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
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+ done > /tmp/net.$netif.override
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+
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if [ $ret -eq 0 ]; then
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> /tmp/net.${netif}.up
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