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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
}
# 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() {
local _netdev=$1
local _brif _dev
local _brif _dev _mac _kdumpdev
for _dev in `ls /sys/class/net/$_netdev/brif/`; do
_kdumpdev=$_dev
if kdump_is_bond "$_dev"; then
kdump_setup_bond "$_dev"
elif kdump_is_team "$_dev"; then
@ -108,20 +125,25 @@ kdump_setup_bridge() {
elif kdump_is_vlan "$_dev"; then
kdump_setup_vlan "$_dev"
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" >> ${initdir}/etc/cmdline.d/41bridge.conf
fi
_brif+="$_dev,"
_brif+="$_kdumpdev,"
done
echo " bridge=$_netdev:$(echo $_brif | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/41bridge.conf
}
kdump_setup_bond() {
local _netdev=$1
local _dev
local _dev _mac _slaves _kdumpdev
for _dev in `cat /sys/class/net/$_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
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 $_slaves | sed 's/,$//')" >> ${initdir}/etc/cmdline.d/42bond.conf
# Get bond options specified in ifcfg
. /etc/sysconfig/network-scripts/ifcfg-$_netdev
bondoptions="$(echo :$BONDING_OPTS | sed 's/\s\+/,/')"
@ -130,12 +152,14 @@ kdump_setup_bond() {
kdump_setup_team() {
local _netdev=$1
local slaves _dev
local _dev _mac _slaves _kdumpdev
for _dev in `teamnl $_netdev ports | awk -F':' '{print $2}'`; do
echo -n " ifname=$_dev:$(kdump_get_perm_addr $_dev)" >> ${initdir}/etc/cmdline.d/44team.conf
slaves+="$_dev,"
_mac=$(kdump_get_perm_addr $_dev)
_kdumpdev=$(kdump_setup_ifname $_dev)
echo -n " ifname=$_kdumpdev:$_mac" >> ${initdir}/etc/cmdline.d/44team.conf
_slaves+="$_kdumpdev,"
done
echo " team=$_netdev:$(echo $slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf
echo " team=$_netdev:$(echo $_slaves | sed -e 's/,$//')" >> ${initdir}/etc/cmdline.d/44team.conf
#Buggy version teamdctl outputs to stderr!
#Try to use the latest version of teamd.
teamdctl "$_netdev" config dump > /tmp/$$-$_netdev.conf
@ -153,6 +177,7 @@ kdump_setup_vlan() {
local _netdev=$1
local _phydev="$(awk '/^Device:/{print $2}' /proc/net/vlan/"$_netdev")"
local _netmac="$(kdump_get_mac_addr $_phydev)"
local _kdumpdev
#Just support vlan over bond, it is not easy
#to support all other complex setup
@ -166,7 +191,8 @@ kdump_setup_vlan() {
kdump_setup_bond "$_phydev"
echo " vlan=$_netdev:$_phydev" > ${initdir}/etc/cmdline.d/43vlan.conf
else
echo " vlan=$_netdev:$_phydev ifname=$_phydev:$_netmac" > ${initdir}/etc/cmdline.d/43vlan.conf
_kdumpdev="$(kdump_setup_ifname $_phydev)"
echo " vlan=$_netdev:$_kdumpdev ifname=$_kdumpdev:$_netmac" > ${initdir}/etc/cmdline.d/43vlan.conf
fi
}
@ -199,7 +225,7 @@ kdump_setup_netdev() {
fi
_ip_conf="${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.
# so we have to avoid adding duplicates
@ -216,7 +242,7 @@ kdump_setup_netdev() {
elif kdump_is_vlan "$_netdev"; then
kdump_setup_vlan "$_netdev"
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
fi
@ -261,8 +287,8 @@ kdump_install_net() {
# gateway.
if [ ! -f ${initdir}${initdir}/etc/cmdline.d/60kdumpnic.conf ] &&
[ ! -f ${initdir}/etc/cmdline.d/70bootdev.conf ]; then
echo "kdumpnic=${_netdev}" > ${initdir}/etc/cmdline.d/60kdumpnic.conf
echo "bootdev=${_netdev}" > ${initdir}/etc/cmdline.d/70bootdev.conf
echo "kdumpnic=$(kdump_setup_ifname $_netdev)" > ${initdir}/etc/cmdline.d/60kdumpnic.conf
echo "bootdev=$(kdump_setup_ifname $_netdev)" > ${initdir}/etc/cmdline.d/70bootdev.conf
fi
}