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dracut-module-setup: NIC renamed with prefix "kdump-" for native ethX 

We met a problem that eth0 ends up being eth1 and eth1 being eth0
between 1st and 2nd kernel. Because we pass ifname=eth0:$mac to force
it's named eth0 and since "eth0"is already taken by the other NIC, udev
fails to bring up the NIC we want, thus kdump fails.

kernel assigned network interface names are not persistent. So if first
kernel is using kernel assigned interface names, then force it to use
"kdump-" prefixed names in second kernel.

For ethX, we put a prefix "kdump-" before it, so in 2nd kernel, ethX
will name to "kdump-ethX". So that we can avoid the naming conflict.

We only need to change the ethernet card name, that means, for bridge,
vlan, bond, team devices' names , we never prefix them. Because these
names are assigned when they're created by userspace.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
WANG Chao 2014-07-21 15:10:05 +08:00
parent fd4bd5552b
commit ba7660f37e
1 changed files with 41 additions and 15 deletions
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56
dracut-module-setup.sh
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@ -97,10 +97,27 @@ kdump_get_perm_addr() {
fi fi
} }
# Prefix kernel assigned names with "kdump-". EX: eth0 -> kdump-eth0
# Because kernel assigned names are not persistent between 1st and 2nd
# kernel. We could probably end up with eth0 being eth1, eth0 being
# eth1, and naming conflict happens.
kdump_setup_ifname() {
local _ifname
if [[ $1 =~ eth* ]]; then
_ifname="kdump-$1"
else
_ifname="$1"
fi
echo "$_ifname"
}
kdump_setup_bridge() { kdump_setup_bridge() {
local _netdev=$1 local _netdev=$1
local _brif _dev local _brif _dev _mac _kdumpdev
for _dev in `ls /sys/class/net/$_netdev/brif/`; do for _dev in `ls /sys/class/net/$_netdev/brif/`; do
_kdumpdev=$_dev
if kdump_is_bond "$_dev"; then if kdump_is_bond "$_dev"; then
kdump_setup_bond "$_dev" kdump_setup_bond "$_dev"
elif kdump_is_team "$_dev"; then elif kdump_is_team "$_dev"; then
@ -108,20 +125,25 @@ kdump_setup_bridge() {
elif kdump_is_vlan "$_dev"; then elif kdump_is_vlan "$_dev"; then
kdump_setup_vlan "$_dev" kdump_setup_vlan "$_dev"
else else
echo -n " ifname=$_dev:$(kdump_get_mac_addr $_dev)" >> ${initdir}/etc/cmdline.d/41bridge.conf _mac=$(kdump_get_mac_addr $_dev)
_kdumpdev=$(kdump_setup_ifname $_dev)
echo -n " ifname=$_kdumpdev:$_mac" >> ${initdir}/etc/cmdline.d/41bridge.conf
fi fi
_brif+="$_dev," _brif+="$_kdumpdev,"
done done
echo " bridge=$_netdev:$(echo $_brif | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/41bridge.conf echo " bridge=$_netdev:$(echo $_brif | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/41bridge.conf
} }
kdump_setup_bond() { kdump_setup_bond() {
local _netdev=$1 local _netdev=$1
local _dev local _dev _mac _slaves _kdumpdev
for _dev in `cat /sys/class/net/$_netdev/bonding/slaves`; do for _dev in `cat /sys/class/net/$_netdev/bonding/slaves`; do
echo -n " ifname=$_dev:$(kdump_get_perm_addr $_dev)" >> ${initdir}/etc/cmdline.d/42bond.conf _mac=$(kdump_get_perm_addr $_dev)
_kdumpdev=$(kdump_setup_ifname $_dev)
echo -n " ifname=$_kdumpdev:$_mac" >> ${initdir}/etc/cmdline.d/42bond.conf
_slaves+="$_kdumpdev,"
done done
echo -n " bond=$_netdev:$(sed -e 's/ /,/g' /sys/class/net/$_netdev/bonding/slaves)" >> ${initdir}/etc/cmdline.d/42bond.conf echo -n " bond=$_netdev:$(echo $_slaves | sed 's/,$//')" >> ${initdir}/etc/cmdline.d/42bond.conf
# Get bond options specified in ifcfg # Get bond options specified in ifcfg
. /etc/sysconfig/network-scripts/ifcfg-$_netdev . /etc/sysconfig/network-scripts/ifcfg-$_netdev
bondoptions="$(echo :$BONDING_OPTS | sed 's/\s\+/,/')" bondoptions="$(echo :$BONDING_OPTS | sed 's/\s\+/,/')"
@ -130,12 +152,14 @@ kdump_setup_bond() {
kdump_setup_team() { kdump_setup_team() {
local _netdev=$1 local _netdev=$1
local slaves _dev local _dev _mac _slaves _kdumpdev
for _dev in `teamnl $_netdev ports | awk -F':' '{print $2}'`; do for _dev in `teamnl $_netdev ports | awk -F':' '{print $2}'`; do
echo -n " ifname=$_dev:$(kdump_get_perm_addr $_dev)" >> ${initdir}/etc/cmdline.d/44team.conf _mac=$(kdump_get_perm_addr $_dev)
slaves+="$_dev," _kdumpdev=$(kdump_setup_ifname $_dev)
echo -n " ifname=$_kdumpdev:$_mac" >> ${initdir}/etc/cmdline.d/44team.conf
_slaves+="$_kdumpdev,"
done done
echo " team=$_netdev:$(echo $slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf echo " team=$_netdev:$(echo $_slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf
#Buggy version teamdctl outputs to stderr! #Buggy version teamdctl outputs to stderr!
#Try to use the latest version of teamd. #Try to use the latest version of teamd.
teamdctl "$_netdev" config dump > /tmp/$$-$_netdev.conf teamdctl "$_netdev" config dump > /tmp/$$-$_netdev.conf
@ -153,6 +177,7 @@ kdump_setup_vlan() {
local _netdev=$1 local _netdev=$1
local _phydev="$(awk '/^Device:/{print $2}' /proc/net/vlan/"$_netdev")" local _phydev="$(awk '/^Device:/{print $2}' /proc/net/vlan/"$_netdev")"
local _netmac="$(kdump_get_mac_addr $_phydev)" local _netmac="$(kdump_get_mac_addr $_phydev)"
local _kdumpdev
#Just support vlan over bond, it is not easy #Just support vlan over bond, it is not easy
#to support all other complex setup #to support all other complex setup
@ -166,7 +191,8 @@ kdump_setup_vlan() {
kdump_setup_bond "$_phydev" kdump_setup_bond "$_phydev"
echo " vlan=$_netdev:$_phydev" > ${initdir}/etc/cmdline.d/43vlan.conf echo " vlan=$_netdev:$_phydev" > ${initdir}/etc/cmdline.d/43vlan.conf
else else
echo " vlan=$_netdev:$_phydev ifname=$_phydev:$_netmac" > ${initdir}/etc/cmdline.d/43vlan.conf _kdumpdev="$(kdump_setup_ifname $_phydev)"
echo " vlan=$_netdev:$_kdumpdev ifname=$_kdumpdev:$_netmac" > ${initdir}/etc/cmdline.d/43vlan.conf
fi fi
} }
@ -199,7 +225,7 @@ kdump_setup_netdev() {
fi fi
_ip_conf="${initdir}/etc/cmdline.d/40ip.conf" _ip_conf="${initdir}/etc/cmdline.d/40ip.conf"
_ip_opts=" ip=${_static}$_netdev:${_proto}" _ip_opts=" ip=${_static}$(kdump_setup_ifname $_netdev):${_proto}"
# dracut doesn't allow duplicated configuration for same NIC, even they're exactly the same. # dracut doesn't allow duplicated configuration for same NIC, even they're exactly the same.
# so we have to avoid adding duplicates # so we have to avoid adding duplicates
@ -216,7 +242,7 @@ kdump_setup_netdev() {
elif kdump_is_vlan "$_netdev"; then elif kdump_is_vlan "$_netdev"; then
kdump_setup_vlan "$_netdev" kdump_setup_vlan "$_netdev"
else else
_ifname_opts=" ifname=$_netdev:$(kdump_get_mac_addr $_netdev)" _ifname_opts=" ifname=$(kdump_setup_ifname $_netdev):$(kdump_get_mac_addr $_netdev)"
echo "$_ifname_opts" >> $_ip_conf echo "$_ifname_opts" >> $_ip_conf
fi fi
@ -261,8 +287,8 @@ kdump_install_net() {
# gateway. # gateway.
if [ ! -f ${initdir}${initdir}/etc/cmdline.d/60kdumpnic.conf ] && if [ ! -f ${initdir}${initdir}/etc/cmdline.d/60kdumpnic.conf ] &&
[ ! -f ${initdir}/etc/cmdline.d/70bootdev.conf ]; then [ ! -f ${initdir}/etc/cmdline.d/70bootdev.conf ]; then
echo "kdumpnic=${_netdev}" > ${initdir}/etc/cmdline.d/60kdumpnic.conf echo "kdumpnic=$(kdump_setup_ifname $_netdev)" > ${initdir}/etc/cmdline.d/60kdumpnic.conf
echo "bootdev=${_netdev}" > ${initdir}/etc/cmdline.d/70bootdev.conf echo "bootdev=$(kdump_setup_ifname $_netdev)" > ${initdir}/etc/cmdline.d/70bootdev.conf
fi fi
} }