Re: [Pacemaker] virtual IP or real IP address
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 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 ___ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
Re: [Pacemaker] virtual IP or real IP address
>>> On 10/28/2009 at 07:26 PM, gilberto migliavacca 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 -- Tim Serong Senior Clustering Engineer, Novell Inc. ___ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
[Pacemaker] virtual IP or real IP address
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? for instance I have a cluster with 2 nodes and 1 tomcat on both machines My purpose is just to start and stop (maybe configure) these tomcat instances. I've created a configuration with the IPsrcaddr resource agent I think this should manage the real IP, isn't it? Could anybody point me in the right direction? thanks in advance gilberto ___ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
