[Cluster-devel] fence-agents integration with Cobbler

[Cluster-devel] fence-agents integration with Cobbler

[Alan Evangelista]

Hi.

I'm a Cobbler developer. Cobbler uses fence-agents to perform power 
management in systems
and it currently supports fence-agents 4.0.4. I want to make Cobbler 
compatible with
latest fence-agents code. Cobbler may run in RHEL 6+ and thus we expect 
fence-agents
to also do it. I'm doing tests with the lpar fence agent.

First, I found out the master branch requires Python 2.7. Using master 
code in a RHEL 6.5
threw an exception in the creation of a StreamHandler object (stream 
argument name in StreamHandler
constructor changed from Python 2.6, available on RHEL 6, to Python 2.7, 
available on RHEL 7).

Then, I found out that there is a RHEL6 branch and tried to use it. 
However, some fence
agents (eg lpar) uses different input parameters names in RHEL6 and 
master branches.
This would force me to check RHEL version before generating fence agents 
input in Cobbler.

Would it be possible to either

(1) backport input parameters names changes to RHEL6 branch? afaik input 
parameters names are independent of RHEL version.
(2) support Python 2.6 in master branch


I'm also open to other alternatives.


Regards,
Alan Evangelista

[Cluster-devel] fence-agents integration with Cobbler

[Marek marx Grac]

Hi,

On 10/23/2014 08:56 PM, Alan Evangelista wrote:
> Hi.
>
> I'm a Cobbler developer. Cobbler uses fence-agents to perform power 
> management in systems
> and it currently supports fence-agents 4.0.4. I want to make Cobbler 
> compatible with
> latest fence-agents code. Cobbler may run in RHEL 6+ and thus we 
> expect fence-agents
> to also do it. I'm doing tests with the lpar fence agent.
>
> First, I found out the master branch requires Python 2.7. Using master 
> code in a RHEL 6.5
> threw an exception in the creation of a StreamHandler object (stream 
> argument name in StreamHandler
> constructor changed from Python 2.6, available on RHEL 6, to Python 
> 2.7, available on RHEL 7).
Yes, this is known issue but we did not focus on that yet. Currently, 
there is just small difference between RHEL5 and RHEL6 but in the RHEL7 
massive rewritement was done. There is (currently dead) branch fence39 
(version 3.9.x) that should follow master branch (version 4.0.x) but 
with all backward compatibility required for stable releases like RHEL6.

> Then, I found out that there is a RHEL6 branch and tried to use it. 
> However, some fence
> agents (eg lpar) uses different input parameters names in RHEL6 and 
> master branches.
> This would force me to check RHEL version before generating fence 
> agents input in Cobbler.
I understand that this is problem but currently the names of options are 
much more standardized.

>
> Would it be possible to either
>
> (1) backport input parameters names changes to RHEL6 branch? afaik 
> input parameters names are independent of RHEL version.
     input = parameters from STDIN?
> (2) support Python 2.6 in master branch
     I will investigate this

m,