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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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By unixfoo at 2007-11-12 09:53
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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!
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