How to create a virtual IP/hostname for a 2 nodes cluster

[Herta Van den Eynde]

You're right of course, crypto, LVS is the Red Hat load balancer.  (I
usually call it piranha, hence my mistake.)  The description I was giving is
for the failover cluster software.  (Does that even have a name?)

So Amos, just to understand your requirements better, does your
active-active cluster run all three services on both nodes, or does it run
one service on one cluster member and the remaining two on the second
cluster member?

Kind regards,

Herta

2009/8/14 crypto grid <cryptogrid at gmail.com>

> On Wed, Aug 12, 2009 at 10:14 AM, Herta Van den Eynde <
> herta.vandeneynde at gmail.com> wrote:
>
>> As this is only a two node cluster, why would you add a load balancer?
>
>
> AFAIK, LVS is, indeed a load balancer. There is no way you can run an a-a
> service in the cluster without a balanced ip.
>
>
>>
>>
>> LVS will give you a unique ip-address per service that you are running in
>> the cluster.  I.e. in your case, you'll get 2 fixed ip-addresses (one for
>> each server) and three virtual addresses (one for each service).
>> When one of the servers goes down, the services (including the virtual
>> addresses) running on that server will automatically migrate to the other
>> server.
>
>
> I saw some customers who didn't want to install red hat lvs in their
> clusters. Instead, they insisted to use external loadbalancers, and
> personally, I have no objection with that, because in some way, you are
> taking some "complexity" out of the servers.
> Sorry for going off at a tangent.
>
>
>>
>>
>> There are a number of caveats, though.
>> 1. you need central storage and a cluster-aware filesystem
>> 2. when services fail over to the other node (either because of server
>> failure or manually), the services are stopped (or crash) on the first
>> server and are restarted on the second.  I.e. running processes do not
>> continue running.  I.e. your applications (and end-users) have to know that
>> when your database fails over, they will have to reconnect.
>>
>> I have no experience with Oracle iAS, or E-business Suite 11i, but if you
>> want to cluster Oracle databases, Oracle RAC (Real Application Cluster) is
>> the way to go.
>> Undoubtedly, Oracle can at least let you know the best way to add
>> redundancy for Oracle iAS and E-business Suite 11i.
>>
>> Kind regards,
>>
>> Herta
>>
>>
>> 2009/8/10 crypto grid <cryptogrid at gmail.com>
>>
>>>  For an active/active mode, i'd recommend the use of a load balancer in
>>> the frontend and the use of private per service ip addresses in the
>>> backend for each node in the cluster.
>>> Give a look at,
>>>
>>> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtual_Server_Administration/
>>>
>>> I think you could use LVS in the same cluster nodes.
>>>
>>> On 8/10/09, Amos KABORE <amos.kabore at gmail.com> wrote:
>>> > Hello,
>>> >
>>> >
>>> >
>>> > We have 2 nodes cluster with rhel5.
>>> >
>>> > Luci is used to manage our cluster (active/active).
>>> >
>>> >
>>> >
>>> > Our system includes 3 services (Oracle iAS, Oracle database and
>>> E-business
>>> > Suite 11i).
>>> >
>>> > We want to create a unique virtual IP/hostname for these services.
>>> >
>>> > Is it possible ?
>>> >
>>> >
>>> >
>>> > How to create a virtual IP/Hostname in our case ?
>>> >
>>> >
>>> >
>>> > As I'm to new to cluster world, your help will be precious.
>>> >
>>> >
>>> >
>>> > Thanks
>>> >
>>> >
>>> >
>>> > amos.kabore at expercosarl.com
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>>
>>> --
>>> redhat-sysadmin-list mailing list
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>>> https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list
>>>
>>
>>
>>
>> --
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>> but it comes with a free ride around the Sun."
>>
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>
>
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but it comes with a free ride around the Sun."
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