topic Re: Virtual IP in Operating System - Linux

Virtual IP

Jojo Castro — Fri, 27 Jun 2008 02:45:05 GMT

Hi all,

I am planning to add virtual IP on our production server. Just to be sure my procedure will not affect the current production, can anyone provide me the "correct and safe" procedure in adding and deleting virtual IP on Linux?

Thanks!

Re: Virtual IP

Ivan Ferreira — Fri, 27 Jun 2008 02:52:38 GMT

Are you talking about an "alias"? That is, another IP address to the same network adatper?

If so, then you can use:

ifconfig eth0:1

ifconfig eth0:1 192.168.0.1 255.255.255.0

To disable the interface

ifconfig eth0:1 down

Re: Virtual IP

Jojo Castro — Fri, 27 Jun 2008 03:45:01 GMT

Is this permanent? that this will also be in effect when I reboot the server?

Re: Virtual IP

Jeeshan — Fri, 27 Jun 2008 06:04:45 GMT

create a file named ifcfg-eth0:0 in /etc/sysconfig/network-scripts folder and enter the following lines

DEVICE=eth0:0 (or whatever you want)
BOOTPROTO=none
ONBOOT=yes
IPADDR=x.x.x.x (your ip address)
NETMASK=x.x.x.x (your net mask)

now this is permanent. then enter the command

#ifup eth0:0

#ping <0 ip="" address="">

or if you wanna make sure you can rebbot the server.

it will not take any effect to any other service.

Re: Virtual IP

Jojo Castro — Fri, 27 Jun 2008 06:34:24 GMT

This is it? I don't add any information like Broadcast ip etc...?

Thanks

Re: Virtual IP

Jeeshan — Fri, 27 Jun 2008 07:26:37 GMT

actually no need to add any broadcast IP for this.

Re: Virtual IP

Jojo Castro — Fri, 27 Jun 2008 07:55:44 GMT

ok thanks

Re: Virtual IP

Jojo Castro — Fri, 27 Jun 2008 07:56:26 GMT

thanks to all for the replies