[Devil-Linux-discuss] Smart way to assign secondary IPs to loopback?

[Rudner, B. <br...@ba...>]

Hi List,

I'm using DL with heartbeat - ldirector and apache for a long time now.

Now I'm doing some tests with upgrades from the "old" /etc to the "new" /etc - storage.

One thing that I ran over on this is the following:

Since I use Apache as an active/active-cluster on two boxes I need to assign a whole bunch of secondary IP-addresses (right now > 20 virtual-IP-Addresses) to the Loopback-Interface.
(Ldirector routes these from one node to the other and therefore the IP-Adresses must be known there internally - Also the Apaches bind to these addresses.)

Heartbeat then removes them from the Loopback and assings them to the physical interface and issues an arp-update to the connected routers on the active node.
On the other hand it removes these IP-adresses from the physical NIC and assignes it back to the Loopback as the node goes standby.

At the moment I have just added some "ip addr add" commands to /etc/init.d/localnet. The adresses must be known before apache and heartbeat starts (else heartbeat will not move them back to loopback when the node goes standby)

Since this is a quick & dirty method I also have to keep an eye on that file on every DL-update (it is not choosen to be kept by default on updates)

Now to my question:

Is there already a smarter way (I may have overlooked) to assign secondary IP-addresses to the loopback interface early in the boot-process without the need to change the init-scripts?

If there is not I might try to rework the localnet-script to reflect those needs to keep this update-save.


Mit freundlichen Grüßen/Kind regards,

Björn Rudner
Administrator

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