[ClusterLabs] Loadbalancing using Pacemaker

[user.clusterlabs.org at siimnet.dk]

> On 8. nov. 2015, at 16.24, Michael Schwartzkopff <ms at sys4.de> wrote:
> 
> Am Samstag, 7. November 2015, 09:40:47 schrieb didier tanti:
>> Hello, i am new to Pacemaker and have a question concerning how to have my
>> cluster services aware of the state and location of the other services in
>> the cluster.  Example:
>> Service A is running on Host XService B1 is running on Host XService B2 is
>> running on Host Y Which API would allow my Service A to send IPC messages
>> to services B1 and B2 in a round robin manner?(for example how Service A
>> would be aware of which B is up and active (B1, B2 or both), and how A
>> would even be able to know on which host B1 or B2 is running?) It looks
>> very basic but i cannot find information on this on clusterlabs.org Is
>> there basic tutorial that would explain how to achieve this ? (I guess i
>> would need to link my service binaries with some pacemaker /corosync libs
>> and use some API ?) Thanks for helping out,
> 
> Hi,
> 
> this task is beyond the ability of pacemaker. Your application has to know how 
> to handle that.
> 
> Best solution would be to use virtual IP addresses for services B1 and B2
Yes and maybe through a IP load balancer like nginx or haproxy to do the round robin

 
> make sure that the IP addresses run together with the services. Now you 
> service A only has to talk to the IP addresses, no matter on which host they 
> run.
> 
> pacemaker could take care that they run on different hosts is possible.
> 
> Mit freundlichen Grüßen,
> 
> Michael Schwartzkopff
> 
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