Hi Tim
thanks for for your help. Now there's less fog in my brain
I'm trying
gilberto
Tim Serong wrote:
>>> On 10/28/2009 at 07:26 PM, gilberto migliavacca <gbmig...@yahoo.it> wrote:
Hi
I have a question. I've seen in the mailing list
a lot of example with the IPAddr/IPAddr2 resource agent
this resource agent manages the Virtual IP.
Could anybody explain me why I have to create a
virtual IP istead of using the real IP?
In brief, the idea is:
- You have (say) two nodes in an HA cluster, each with its
own unique IP address (i.e. the address you ssh to in order
to administer that node).
- The "virtual" IP address is a third, different IP, which is
managed by the IPAddr2 RA. This is active on only one node
at a time, and is managed by Pacemaker.
- You set up colocation/ordering constraints so that the
IPAddr2 resource runs on the same node as an instance of
Apache (or whatever service you're providing).
- Clients connect to that "virtual" IP, which can then failover to
the other node, if the node it's running on dies.
HTH,
Tim
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