[CentOS] Convert DHCP to static during kickstart

Marcus Moeller mail at marcus-moeller.de
Mon Mar 8 08:54:04 UTC 2010


2010/3/8 Marcus Moeller <mail at marcus-moeller.de>:
> Hi Christoph,
>
>>> is there an easy way to kickstart a system using DHCP, but then use
>>> the obtained settings to define static network configurations on the
>>> installed system?
>>>
>>> Best Regards
>>> Marcus
>>
>>
>> A simple %post script comes to mind.
>
> And also to this list ?-)

Okay, got one.

KSDEVICE=`LANG=C /sbin/route -n | awk '/^0.0.0.0/ { print $8 }'`
IP=`LANG=C /sbin/ifconfig $KSDEVICE | /bin/awk '/inet/ && !/inet6/
{sub(/addr:/, ""); print $2}'`
HOSTNAME=`LANG=C /usr/bin/host $IP | /bin/awk '{sub(/\.$/, ""); print $5}'`
NETMASK=`LANG=C /sbin/ifconfig $KSDEVICE | /bin/awk '/inet/ &&
!/inet6/ {sub(/Mask:/, ""); print $4}'`
NETWORK=`LANG=C /bin/ipcalc $IP -n $NETMASK | /bin/cut -d\= -f2`
GATEWAY=`LANG=C echo $NETWORK | awk -F'.' '{print $1"."$2"."$3"."$4+1}'`
HWADDR=`LANG=C /sbin/ifconfig $KSDEVICE | /bin/awk '/HWaddr/ { print $5 }'`

cat << EOF > /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=$HOSTNAME
GATEWAY=$GATEWAY
EOF

cat << EOF > /etc/sysconfig/network-scripts/ifcfg-$KSDEVICE
DEVICE=$KSDEVICE
BOOTPROTO=static
IPADDR=$IP
NETMASK=$NETMASK
ONBOOT=yes
HWADDR=$HWADDR
EOF

Best Regards
Marcus


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