bond

http://t.zoukankan.com/openstack-elk-p-7614421.html
https://www.linuxquestions.org/linux/answers/Networking/Linux_bonding_howto_0
More Details on : http://unixfoo.blogspot.com/

Howto : Linux bonding

Bonding is creation of a single bonded interface by combining 2 or more ethernet interfaces. This helps in high availability and performance improvement.

Steps for bonding in Fedora Core and Redhat Linux

Step 1.

Create the file ifcfg-bond0 with the IP address, netmask and gateway. Shown below is my test bonding config file.

$ cat /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
IPADDR=192.168.1.12
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
USERCTL=no
BOOTPROTO=none
ONBOOT=yes

Step 2.

Modify eth0, eth1 and eth2 configuration as shown below. Comment out, or remove the ip address, netmask, gateway and hardware address from each one of these files, since settings should only come from the ifcfg-bond0 file above.

$ cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=none

HWADDR=00:12:17:5C:A7:9D

IPADDR=192.168.1.12

NETMASK=255.255.255.0

TYPE=Ethernet

GATEWAY=192.168.1.1

USERCTL=no

IPV6INIT=no

PEERDNS=yes

ONBOOT=yes

Settings for Bond

MASTER=bond0
SLAVE=yes

$ cat /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1
BOOTPROTO=none

HWADDR=01:12:18:5C:A7:D9

IPADDR=192.168.1.13

NETMASK=255.255.255.0

ONBOOT=yes

TYPE=Ethernet

USERCTL=no

IPV6INIT=no

PEERDNS=yes

Settings for bonding

MASTER=bond0
SLAVE=yes
$ cat /etc/sysconfig/network-scripts/ifcfg-eth2

DEVICE=eth2
BOOTPROTO=none

HWADDR=00:12:27:5C:A7:9D

IPADDR=192.168.1.12

NETMASK=255.255.255.0

ONBOOT=yes

TYPE=Ethernet

GATEWAY=192.168.1.1

USERCTL=no

IPV6INIT=no

PEERDNS=yes

MASTER=bond0
SLAVE=yes

Step 3.

Set the parameters for bond0 bonding kernel module. Add the following lines to /etc/modprobe.conf

bonding commands

alias bond0 bonding
options bond0 mode=balance-alb miimon=100

Step 4.

Load the bond driver module from the command prompt.

$ modprobe bonding

Step 5.

Restart the network, or restart the computer.

$ service network restart # Or restart computer

When the machine boots up check the proc settings.

$ cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.0.2 (March 23, 2006)

Bonding Mode: adaptive load balancing
Primary Slave: None
Currently Active Slave: eth2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:13:72:80: 62:f0

Look at ifconfig -a and check that your bond0 interface is active. You are done!