bondinator.sh

#!/bin/sh

# This is a (relatively) quick script you can use to
# configure bonding on production servers like splunk
# db's or any other prod bare metal.
# Usage is straight forward, invoke the script with 
# the standard ./bondinator , and hopefully the server
# comes back with a clean and bonded interface.  If not,
# to the IPMI-mobile to resurect.  Backups of the 
# network-scripts files  are stored in
# /tmp/network-scripts_bak directory.

# Quick test to ensure machine isn't already bonded.

bond_test=$(cat /proc/net/bonding/bond0)
if [[ $? -eq 0 ]]; then
  echo "This server appears to be bonded already, exiting."
  exit 1
else
  echo "No bond detected, attempting to create"
fi

up_interfaces=($(ip addr | grep ' UP ' | awk '{print $2}' | cut -d: -f1))

echo "I found the following active interfaces: ${up_interfaces[*]}"
ip_address=$(ip addr | grep "global ${up_interfaces[0]}" | awk '{print $2}' | cut -d/ -f1)
echo "Primary IP is: $ip_address"

echo "Backing up network-scripts folder to /var/tmp/network-scripts_bak"
mkdir -p /var/tmp/network-scripts_bak
cp /etc/sysconfig/network-scripts/* /var/tmp/network-scripts_bak

echo "Removing ifcfg files"
rm -f /etc/sysconfig/network-scripts/ifcfg-e*

echo "Creating new bonding scripts"

cat > /etc/sysconfig/network-scripts/ifcfg-bond0 <<EOF
DEVICE=bond0
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=none
NM_CONTROLLED=no
USERCTL=no
BONDING_OPTS="mode=4 miimon=100"
IPADDR=$ip_address
NETMASK=255.255.240.0
EOF

cat > /etc/sysconfig/network-scripts/ifcfg-${up_interfaces[0]} <<EOF
DEVICE=${up_interfaces[0]}
USERCTL=no
ONBOOT=yes
NM_CONTROLLED=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
$(grep HWADDR /var/tmp/network-scripts_bak/ifcfg-${up_interfaces[0]})
EOF

cat > /etc/sysconfig/network-scripts/ifcfg-${up_interfaces[1]} <<EOF
DEVICE=${up_interfaces[1]}
USERCTL=no
ONBOOT=yes
NM_CONTROLLED=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
$(grep HWADDR /var/tmp/network-scripts_bak/ifcfg-${up_interfaces[1]})
EOF

echo "flushing ${up_interfaces[0]}"
ip addr flush dev ${up_interfaces[0]}
echo "flushing ${up_interfaces[1]}"
ip addr flush dev ${up_interfaces[1]}
echo "restarting network service"
service network restart