Bonding síťových karet

Channel Bonding Interfaces

Red Hat Enterprise Linux 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.

To create a channel bonding interface, create a file in the /etc/sysconfig/network-scripts/ directory called ifcfg-bond, replacing with the number for the interface, such as 0.

The contents of the file can be identical to whatever type of interface is getting bonded, such as an Ethernet interface. The only difference is that the DEVICE= directive must be bond, replacing with the number for the interface.

The following is a sample channel bonding configuration file:

DEVICE=bond0 
BOOTPROTO=none
ONBOOT=yes
NETWORK=10.0.1.0
NETMASK=255.255.255.0
IPADDR=10.0.1.27
USERCTL=no

After the channel bonding interface is created, the network interfaces to be bound together must be configured by adding the MASTER= and SLAVE= directives to their configuration files. The configuration files for each of the channel-bonded interfaces can be nearly identical.

For example, if two Ethernet interfaces are being channel bonded, both eth0 and eth1 may look like the following example:

DEVICE=eth 
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
USERCTL=no

In this example, replace with the numerical value for the interface.

For a channel bonding interface to be valid, the kernel module must be loaded. To ensure that the module is loaded when the channel bonding interface is brought up, add the following line to /etc/modprobe.conf:

alias bond bonding

Replace with the number of the interface, such as 0. For each configured channel bonding interface, there must be a corresponding entry in /etc/modprobe.conf.

Once /etc/modprobe.conf is configured — and the channel bonding interface and network interfaces are configured — the ifup command can be used to bring up the channel bonding interface.

Important

Important aspects of the channel bonding interface are controlled through the kernel module. For more information about controlling the bonding modules, refer to Section 40.5.2, “The Channel Bonding Module”.

Zdroje:
http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-networkscripts-interfaces.html
http://www.riccardoriva.com/archives/686

This simple post will show how to configure Ethernet Bonding on two (or more) network interfaces on RHEL 5 or CentOS 5.
I’ve tested this configuration on a CentOS 5.2 with kernel 2.6.18-92.1.22.el5 as you could see below :

uname -a
Linux serverlab.riccardoriva.local 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/redhat-release
CentOS release 5.2 (Final)

If you want to create a bonding on two interface (i.e. eth0 and eth1) you should do the following :

Edit /etc/sysconfig/network-scripts/ifcfg-eth0

# Bonding eth0 to bond0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
USERCTL=NO

Edit /etc/sysconfig/network-scripts/ifcfg-eth1

# Bonding eth1 to bond0
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
USERCTL=NO

Copy /etc/sysconfig/network-scripts/ifcfg-eth1 to /etc/sysconfig/network-scripts/ifcfg-bond0 to keep the same file permission by executing the following commands :

cd /etc/sysconfig/network-scripts
copy ifcfg-eth1 ifcfg-bond0

Edit /etc/sysconfig/network-scripts/ifcfg-bond0

ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
NETWORK=10.100.100.0
NETMASK=255.255.255.0
IPADDR=10.100.100.1
USERCTL=NO

Edit /etc/modprobe.conf adding the following line :

alias bond0 bonding

Reboot your system to let modules be loaded or load it manually with the following command :

insmod bond0 bonding

If you haven’t rebooted your system, restart your network with the following command :

/etc/init.d/network restart

You should check if bonding is working you should look at /proc/net/bonding/bond0 with the following command :

cat /proc/net/bonding/bond0

and you should see something similar to the following :

Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)
Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0
Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:88:5a:3c
Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:88:5a:3d

You’ve done

Hope this help

Bye
Riccardo

 

 

How to Set up Network Bonding on CentOS 5.x Tutorial

 

http://www.how2centos.com/how-to-set-up-network-bonding-with-centos-5x/
Bonding síťových karet