Easy bond Interface

If you ever set up a bond interface on Linux you know it takes a few file editing. I got tired of doing this, please find my script below creating a bond interface. This is crafted for CentOS or RedHat but it might work on other distributions as well. Feel free to check out the git repo and improve it 😉

#!/bin/bash
#Created by: Laszlo Danielisz: https://github.com/danielisz/linux 
#

_usage() {

cat <<EOF
Usage: $0 [p1p1 p1p2]

Warning, this script was crafted for CentOS/RHEL!

The first interface is what has currently the IP
Please rovide two unique interfaces
The script only handles IPv$, IPv6 must be set manualy
EOF

}

_makebond() {

### backing up current interface config
/bin/cp /etc/sysconfig/network-scripts/ifcfg-$INTERFACE1 /root/
/bin/cp /etc/sysconfig/network-scripts/ifcfg-$INTERFACE2 /root/

IP=`ip address show dev $INTERFACE1 | grep inet | awk '{print $2}' | cut -f1 -d "/" | sed -n '/\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}/p'`
MASK=`ip address show dev $INTERFACE1 | grep inet | awk '{print $2}' | cut -d "/" -f 2 | head -1`
GW=`ip route show | grep default | awk '{print $3}'`
UUID1=`/bin/uuidgen $INTERFACE1`
UUID2=`/bin/uuidgen $INTERFACE2`

cat > /etc/sysconfig/network-scripts/ifcfg-bond0 << EOL
DEVICE=bond0
BONDING_OPTS="miimon=100 mode=active-backup primary=$INTERFACE1"
BONDING_MASTER=yes
BOOTPROTO=none
IPADDR=$IP
PREFIX=$MASK
GATEWAY=$GW
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
NAME=bond0
ONBOOT=yes
DOMAIN=vrt.sourcefire.com
IPV6INIT="NO"
IPV6_PRIVACY="NO"
IPV6_AUTOCONF="NO"
IPV6_FAILURE_FATAL="NO"
EOL

cat > /etc/sysconfig/network-scripts/ifcfg-$INTERFACE1 << EOL
TYPE=Ethernet
NAME=$INTERFACE1
UUID=$UUID1
DEVICE=$INTERFACE1
ONBOOT=yes
MASTER=bond0
SLAVE=yes
IPV6INIT="NO"
IPV6_AUTOCONF="NO"
IPV6_DEFROUTE="NO"
IPV6_FAILURE_FATAL="NO"
IPV6_ADDR_GEN_MODE="NO
EOL

cat > /etc/sysconfig/network-scripts/ifcfg-$INTERFACE2 << EOL
TYPE=Ethernet
NAME=$INTERFACE2
UUID=$UUID2
DEVICE=$INTERFACE2
ONBOOT=yes
MASTER=bond0
SLAVE=yes
IPV6INIT="NO"
IPV6_AUTOCONF="NO"
IPV6_DEFROUTE="NO"
IPV6_FAILURE_FATAL="NO"
IPV6_ADDR_GEN_MODE="NO"
EOL

}

case $2 in

    *[0-9])
	    INTERFACE1=$1
	    INTERFACE2=$2
            _makebond
            ;;
    *)
            _usage
            ;;
esac

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