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List:       ssic-linux-devel
Subject:    Re: [SSI] [Design] Cluster wide TCP and LVS Part 3
From:       Bruce Walker <bruce () kahuna ! cag ! cpqcorp ! net>
Date:       2002-04-29 23:13:53
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> Hi, 
> 
>  
> 
> --------------------------------------------------------- subnet 1
> 	|	 			|
> 	|				|
> 	|				|
> 	|				|
> 	|				|
> 	Node 1			 	Node 2
> 	\				/
> 	 \			       /
> 	  \			      /	
> 	----------------------------------	
> 	|		CI		|
> 	|				|
> 	------------------------------------
> 	/				\
>        /				 \
> 
>     Node 3				Node 4
> 
> 
My problem here is that the LVS form of distribution we are using is
redirection and for redirection, all the servers must be in the same
subnet as the VIP.  Node3 and Node4 are not and cannot participate in
the VIP for subnet 1.  LVS supports other forms of distribution
(NAT and tunnelling as I remember).  Not sure what it means to use
them in this environment?

> 
>  The only way for Node4 and Node3 to communicate to   machines in
> subnet1 with CVIP  as source address  is to set the default gateway as

    Node4 and node3 cannot have a source address of CVIP since they don't
    have an interface on the subnet to put the ip alias on.

> node1 or node2. We configure LVS director as the router for routing the
> packets arrived from  Node3 and Node4. Let's say we have Node1 as the
> Director and Node3 and Node4 has been communicating through the director
> to the outside world with CVIP as the source address. Now when node1
> fails we make Node2 as the director. (Discussed in Director failover).
> In this case node2 and node4 cannot communicate further to the outside
> world because there gw is failed. 
> 
> HOW to solve.
> 	(1). Change the default gw on Node3 and Node4. to node2

yes.

> 	(2). Node 2 should take over the node 1 IP address.( I am not sure
> about this. Does this mean we should take over Node1 cluster
> interconnect IP. In that case when node1 comes back what will happen ?(
> Node 2 should release the IP. (ifconfig xxx down.) ). Are there any
> other issues associated with this ?
> 
> -aneesh 
> 
> 
> 
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