The Private and Public interface used in case of RAC 10g should have redundancy
in network interface so that in case a network interface fails the backup interface can take over.
To create a channel bonding interface, first create a file in the /etc/sysconfig/network-scripts/ directory.
You can copy an existing ifcfg-eth# to ifcfg-bond#, where # is a number for the interface.
In general # start with 0. Update the ifcfg-bond#,
change the DEVICE= directive must be bond#.
When the bonding device config file is created you need to update the interfaces which you want to bond and add the master=bond# to the interface configuration fileas well as add slave=yes.
Remove the IP adress information. Repeat this step for 2 interfaces.Below is an example of the configuration file of the interfaces.
Example: interface bond0
GATEWAY=192.168.100.1
DEVICE=bond0
BONDIG_OPTS="mode=1 miimon=500
"BOOTPROTO=none
NETMASK=255.255.255.0
IPADDR=192.168.100.10
ONBOOT=yesUSERCTL=no
Example: interface ifcfg-eth2
GATEWAY=192.168.100.1
TYPE=Ethernet
DEVICE=eth2
BOOTPROTO=none
NETMASK=255.255.255.0
MASTER=bond0 <=== here the bond0 is defined
SLAVE=yes <== here the interface role is defined
ONBOOT=yes
USERCTL=no
IPV6
INIT=no
PEERDNS=yes
Beside the interface configuration you need to update the /etc/modprobe.conf and add the following line:alias bond0 bondinginstall bond0 /sbin/modprobe bonding -o bonding0 mode=1 miimon=500
When the above steps are performed you can start the interfaces and check the result.ifup bond0ifup eth0ifup eth2
cat /proc/net/bonding/bond0
example output:
Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)
Bonding Mode: load balancing (round-robin)MII Status: upMII Polling Interval (ms): 0Up Delay (ms): 0Down Delay (ms): 0
Slave Interface: eth0MII Status: upLink Failure Count: 0Permanent HW addr: 00:0c:29:8a:5e:21
Slave Interface: eth2MII Status: upLink Failure Count: 0Permanent HW addr: 00:0c:29:8a:5e:0d
