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?)<br><br>
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?<br>
<br>Kind regards,<br><br>Herta<br><br><div class="gmail_quote">2009/8/14 crypto grid <span dir="ltr"><<a href="mailto:cryptogrid@gmail.com">cryptogrid@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="gmail_quote"><div class="im">On Wed, Aug 12, 2009 at 10:14 AM, Herta Van den Eynde <span dir="ltr"><<a href="mailto:herta.vandeneynde@gmail.com" target="_blank">herta.vandeneynde@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">As this is only a two node cluster, why would you add a load balancer?</blockquote>
<div> </div>
</div><div>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.</div><div class="im">
<div> </div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"><span></span><br><br>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). <br>
When one of the servers goes down, the services (including the virtual addresses) running on that server will automatically migrate to the other server.</blockquote>
<div> </div>
</div><div>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.</div>
<div>Sorry for going off at a tangent.</div><div><div></div><div class="h5">
<div> </div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"><span></span><br><br>There are a number of caveats, though. <br>1. you need central storage and a cluster-aware filesystem <br>
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.<br>
<br>I have no experience with <font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;" lang="EN-US">Oracle iAS, or E-business Suite 11i</span></font>, but if you want to cluster Oracle databases, Oracle RAC (Real Application Cluster) is the way to go. <br>
Undoubtedly, Oracle can at least let you know the best way to add redundancy <font face="Arial" size="2">for <span style="font-size: 10pt; font-family: Arial;" lang="EN-US">Oracle iAS and E-business Suite 11i</span></font>.<br>
<br>Kind regards,<br><br>Herta<br> <br><br>
<div class="gmail_quote">2009/8/10 crypto grid <span dir="ltr"><<a href="mailto:cryptogrid@gmail.com" target="_blank">cryptogrid@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div></div>
<div>For an active/active mode, i'd recommend the use of a load balancer in<br>the frontend and the use of private per service ip addresses in the<br>backend for each node in the cluster.<br>Give a look at,<br>
<a href="http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtual_Server_Administration/" target="_blank">http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtual_Server_Administration/</a><br>
<br>I think you could use LVS in the same cluster nodes.<br>
<div>
<div></div>
<div><br>On 8/10/09, Amos KABORE <<a href="mailto:amos.kabore@gmail.com" target="_blank">amos.kabore@gmail.com</a>> wrote:<br>> Hello,<br>><br>><br>><br>> We have 2 nodes cluster with rhel5.<br>><br>
> Luci is used to manage our cluster (active/active).<br>><br>><br>><br>> Our system includes 3 services (Oracle iAS, Oracle database and E-business<br>> Suite 11i).<br>><br>> We want to create a unique virtual IP/hostname for these services.<br>
><br>> Is it possible ?<br>><br>><br>><br>> How to create a virtual IP/Hostname in our case ?<br>><br>><br>><br>> As I'm to new to cluster world, your help will be precious.<br>><br>><br>
><br>> Thanks<br>><br>><br>><br>> <a href="mailto:amos.kabore@expercosarl.com" target="_blank">amos.kabore@expercosarl.com</a><br>><br>><br>><br>><br>><br>><br><br></div></div></div></div>
<font color="#888888">--<br>redhat-sysadmin-list mailing list<br><a href="mailto:redhat-sysadmin-list@redhat.com" target="_blank">redhat-sysadmin-list@redhat.com</a><br><a href="https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list" target="_blank">https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list</a><br>
</font></blockquote></div><br><br clear="all"><br>-- <br>"Life on Earth may be expensive, <br>but it comes with a free ride around the Sun."<br><br>--<br>redhat-sysadmin-list mailing list<br><a href="mailto:redhat-sysadmin-list@redhat.com" target="_blank">redhat-sysadmin-list@redhat.com</a><br>
<a href="https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list" target="_blank">https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list</a><br></blockquote></div></div></div><br>
<br>--<br>
redhat-sysadmin-list mailing list<br>
<a href="mailto:redhat-sysadmin-list@redhat.com">redhat-sysadmin-list@redhat.com</a><br>
<a href="https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list" target="_blank">https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list</a><br></blockquote></div><br><br clear="all"><br>-- <br>"Life on Earth may be expensive, <br>
but it comes with a free ride around the Sun."<br>