From: Greg Hurlman [mailto:[email protected]]
Sent: den 10 maj 2014 22:29
To: Hans Feldt
Subject: Re: [users] Integration issues
Thanks Hans for letting know that CLM service can be consumed independently
from AMF service.
Now, in a given cluster configuration with two controller nodes and 3 payload
nodes, where PLs are hosted with SUs with sa-aware components where as
controllers are without any SUs and components,
If I create a monitoring process in a controller node which implements the CLM
service, to monitor the payload nodes(leaving/joining/changes),
1. Is is that the payloads by default obtain the cluster membership as soon as
they are defined in the cluster nodes.cfg and created by immxml-configure and
when I start the opensaf service?
[Hans] Yes. But it is what is in the CLM information model in IMM that controls
this. You can add/remove CLM nodes dynamically as you expand/shrink your
cluster. What is in nodes.cfg just controls creation of the very first initial
imm.xml needed to boot the cluster.
2. If not, do I need to run a monitoring process in every payload node or need
to configure these payload nodes in some way that they join the cluster and
become a member and hence can be monitored.
3. Given that I intend to run this monitoring process as a external process(no
SUs and SGs defined for this process I mean) in controller nodes only,
[Hans] To AMF an external process is something outside the cluster. A program
executed on a controller is inside the cluster.
a. Is it possible to run as a external process? If yes what are the
steps to instantiate this process. I am aware of amf-adm commands to
instantiate sa-aware component, but what are the steps to instantiate this
external component(monitoring process implementing CLM library)?
[Hans] guess you mean _using_ (not implementing) the CLM library. Just start
the client program! At the command prompt or init started or…
b. If no, is it need be a component configured in IMM model and hence
belongs to some SG, SU etc. and can be instantiated again using
using the instantiate and terminate scripts.
I am some what confused with the way CLM library can be consumed and hence
these above basic queries, which I believe would help me to proceed further. I
know there are the SAForum manuals and ppts but do we have any sample example
or code snippet that demonstrate this or try out some examples to start with?
[Hans] there is no plain CLM tracker program but pls see tests/clmsv/src. There
is nothing magic here. The same way the ntfsubscribe program works a
“clmtracker” can work. A normal unix program with a main …
Thanks
Greg
On Fri, May 9, 2014 at 12:52 AM, Hans Feldt
<[email protected]<mailto:[email protected]>> wrote:
See inline
But if you anyway want to push the information to all your sa-aware components
why not create a ClmTracker kind of server that can be instantiated in each
sa-aware component?
I would do it as a separate thread that just calls an installed callback into
client specific code.
A bit like a SockerServer in python.
/Hans
> -----Original Message-----
> From: Greg Hurlman
> [mailto:[email protected]<mailto:[email protected]>]
> Sent: den 9 maj 2014 08:08
> To:
> [email protected]<mailto:[email protected]>
> Subject: [users] Integration issues
>
> Hi,
>
> Looking for help on some basic clarifications on the usage of CLM library.
> I am trying to detect a cluster node failure (say node manual reboot, admin
> shutdown or power failure) using CLM library from controller nodes or a
> node where no service units are hosted. Each node other then the controller
> nodes, hosts couple of service units with SA-aware components.
>
> 1. Is this possible to monitor the nodes from controller nodes without
> integrating the library into the sa-aware apps?
[Hans] of course, CLM is separate service from AMF
>
> 2. I am thinking of creating a separate component in the controller node
> which will only implement this library in order to monitor and receive the
> cluster changes notifications. If so then do I need to configure this
> component in the IMM or just run as a Linux process?
[Hans] Guess you mean AMF? Linux process is fine
>
> 3. Are there any additional IMM configuration changes required to integrate
> this library?
[Hans] ?
>
> Appreciate for any help.
>
> Thanks
> Greg
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