Configure Bonding in Redhat or CentOS
1. Create ifcfg-bond0 File
All the network configuration scripts are located under /etc/sysconfig/network-scripts in RHEL. Verify the link status of the interfaces using the command “ethtool ”
Create a file ifcfg-bond0 with the below values and replace with correct IP, NETMASK and the appropriate bonding mode ( mode 0, 1 ,2 …) like the below.
# cd /etc/sysconfig/network-scripts # vi ifcfg-bond0 DEVICE=bond0 IPADDR=192.168.1.3 NETMASK=255.255.255.0 ONBOOT=yes BOOTPROTO=none USERCTL=no BONDING_OPTS="mode=1 miimon=100"
2. Modify ifcfg-eth0 and ifcfg-eth1 Files
Edit the network interface files for eth0 & eth1 to reflect entries similar to the following. Make sure you have MASTER and SLAVE parameters defined as shown below.
# cat ifcfg-eth0 DEVICE=eth0 HWADDR=00:44:56:67:0C:10 MASTER=bond0 SLAVE=yes ONBOOT=yes USERCTL=no BOOTPROTO=none # cat ifcfg-eth1 DEVICE=eth1 HWADDR=00:50:56:10:0C:2A MASTER=bond0 SLAVE=yes ONBOOT=yes USERCTL=no BOOTPROTO=none
3. Create bonding.conf File
Create the bonding.conf file with the following content.
# vi /etc/modprobe.d/bonding.conf alias netdev-bond0 bonding
4. Restart Network Service and Verify Bonding
Restart the network services:
service network restart
Verify the bonding status as shown below.
The following indicates that the current bonding mode is fault-tolerance.
# cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009) Bonding Mode: fault-tolerance (active-backup) Primary Slave: None Currently Active Slave: eth0 MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth0 MII Status: up Speed: 10000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:50:56:8e:0c:10 Slave queue ID: 0 Slave Interface: eth1 MII Status: up Speed: 10000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:50:56:8e:0c:2a Slave queue ID: 0
You can perform the test by bringing down one interface, seeing that other interface will be active one and vice-versa.
