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RE: [Linux-cluster] RHEL4.0 CS and Ldap



Dalton, I figured as much and you could indeed use the CS portion to do what
Heartbeat
does. I do that same thing on RHEL3CS. It's the replication part that doesn't
fall into
the clusterring category, that's all. The cluster serverices (resource
manager) does, in
effect, what hearbeat does tho so you can either have a single instence
bounce aroung
from node to node as needed, or you could have a master + replicas all
running at the 
same time (with differnet data stores) and not have to worry about the
service failing
over, just flip IP address, which is what it sounds like you are doing
already. For better
performance tho, if that's needed, you'll prolly want the LVS (piranha)
solution.



Good luck



Corey 

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Dalton, Maurice
Sent: Thursday, March 09, 2006 9:17 AM
To: linux clustering
Subject: RE: [Linux-cluster] RHEL4.0 CS and Ldap

I am currently using Heartbeat to solve my need for Highly Available Ldap
servers. I was just trying to figure another way to provide HA, replication
with RHEL4.0 CS.  It would be nice to build a RHEL4.0 CS service for ldap
that would cover all of my requirements.

Just a thought.
Thanks for the replies...
 

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Kovacs, Corey J.
Sent: Thursday, March 09, 2006 8:08 AM
To: linux clustering
Subject: RE: [Linux-cluster] RHEL4.0 CS and Ldap

You might be able to, but it's not really cluster related. You'll get better
information on the openldap lists.


Cheers.



Corey 

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Baesso Mirko
Sent: Thursday, March 09, 2006 9:00 AM
To: linux clustering
Subject: R: [Linux-cluster] RHEL4.0 CS and Ldap

Sorry but i try to use sync-replica either then slurpd on openldap 2.3, can i
setup a multi-master environment?


Baesso Mirko - System Engineer
KSolutions.S.p.A.
Via Lenin 132/26
56017  S.Martino Ulmiano (PI) - Italy
tel.+ 39 0 50 898369 fax. + 39 0 50 861200
baesso ksolutions it   http//www.ksolutions.it

-----Messaggio originale-----
Da: Kovacs, Corey J. [mailto:cjk techma com]
Inviato: giovedì 9 marzo 2006 14.43
A: linux clustering
Oggetto: RE: [Linux-cluster] RHEL4.0 CS and Ldap

Multi master LDAP is not all that it's cracked up to be. There are few
benefits in being able to write to different servers. The problem is that
like many things, the rule is "Last write wins". Writing in LDAP dirs is not
something that is "typically" done in high volumes anyway, but reading is. If
you just need to load balance traffic, then you might look into an LVS
implementation. That way you can set up several replicas and spread the load
across them. If your Master gets blown away, you can promote of the replicas
to a master.. Just takes some manual intervention.


Just my two cents...


Corey 

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Nick Burrett
Sent: Thursday, March 09, 2006 4:49 AM
To: linux clustering
Subject: Re: [Linux-cluster] RHEL4.0 CS and Ldap

Rainer Duffner wrote:
> Lon Hohberger wrote:
> 
>> On Wed, 2006-03-08 at 12:43 -0600, Dalton, Maurice wrote:
>>  
>>
>>> Is there a way to create an Ldap cluster that can do replication 
>>> with RHEL 4.0 CS?
>>>   
>>
>>
>> For some reason, I though OpenLDAP had built-in replication?
>>  
>>
> 
> 
> Not multi-master (which I assume is what the original poster wants).
> 
> http://www.redhat.com/en_us/USA/home/solutions/directoryserver/
> 
> exists for a reason...

As I understand it, multi-master can be accomplished in OpenLDAP 2.3 using
sync-replication between the two nodes.  This is not true multi-master, but
the effect is near-enough.

Regards,

Nick.

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