Linux Kickstart POST Script to Bond Two NICs

Friday, July 5, 2013

The following can be placed in a kickstart POST script to bond two NICs when it is unknown what two NICs will be active. This is typically more of an issue on physical servers rather than virtual machines.

for i in $(ifconfig -a | sed 's/[ \t].*//;/^\(lo\|\)$/d' | grep eth)
do
STATUS=$(ethtool $i | grep 'Link detected' | awk -F: '{print $2}')

if [ $STATUS == 'yes' ]; then
                COUNTER=$((COUNTER+1))

                NIC[$COUNTER]="$i"
fi
done

cat << EOF1 >/etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
IPADDR=$IPADDRESS
NETMASK=$NETMASK
USERCTL=no
BONDING_OPTS="mode=1 miimon=100 primary=${NIC[1]}"
EOF1

cat << EOF2 >>/etc/sysconfig/network-scripts/ifcfg-${NIC[1]}
MASTER=bond0
SLAVE=yes
EOF2

cat << EOF3 >>/etc/sysconfig/network-scripts/ifcfg-${NIC[2]}
MASTER=bond0
SLAVE=yes
EOF3

echo 'alias bond0 bonding' >> /etc/modprobe.conf


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