CentOS 6 Channel Bonding allows administrators to bind multiple network interfaces together into a single channel using the bonding kernel module and a special network interface called a channel bonding interface. Channel bonding enables two or more network interfaces to act as one, simultaneously increasing the bandwidth and providing redundancy.
CentOS 6 Channel Bonding Channel bonding (also known as “Ethernet bonding”) is a computer networking arrangement in which two or more network interfaces on a host computer are combined for redundancy or increased throughput.
mode=0 (Balance-rr) – This mode provides load balancing and fault tolerance. mode=1 (active-backup) – This mode provides fault tolerance. mode=2 (balance-xor) – This mode provides load balancing and fault tolerance. mode=3 (broadcast) – This mode provides fault tolerance. mode=4 (802.3ad) – This mode provides load balancing and fault tolerance. mode=5 (balance-tlb) – Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave. mode=6 (balance-alb) – Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave.
Note: Always append extra configuration in case of a rollback.
Configuring Channel Bonding
# cd /etc/sysconfig/network-scripts/ # vi ifcfg-bond0
We’ll be using mode=6 (balance-alb)
DEVICE=bond0 USERCTL=no BOOTPROTO=none ONBOOT=yes IPADDR=10.0.0.10 NETMASK=255.255.0.0 NETWORK=10.0.0.0 BONDING_OPTS="miimon=100 mode=balance-alb" TYPE=Unknown IPV6INIT=no
# vi ifcfg-eth0
DEVICE=eth0 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no
# vi ifcfg-eth1
DEVICE=eth1 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no
# vi ifcfg-eth2
DEVICE=eth2 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no
Due to the fact that /etc/modprobe.conf has been deprecated in CentOS 6, the process of bonding network interfaces has changed a bit.
Now instead of defining your bond in your /etc/modprobe.conf, you define it in /etc/modprobe.d/bonding.conf
# vi /etc/modprobe.d/bonding.conf
Append the following onto the end out your modprobe config file
alias bond0 bonding
# servive network restart