[Swift-user] Swift on local resources

[Allan Espinosa]

Hi Andriy and Mike,

here is my example ~/.ssh/auth.defaults for executing jobs on
tp-login1.ci.uchicago.edu:

[aespinosa at tp-login2 ~]$ cat .ssh/auth.defaults
tp-login1.ci.uchicago.edu.type=key
tp-login1.ci.uchicago.edu.username=aespinosa
tp-login1.ci.uchicago.edu.key=/home/aespinosa/.ssh/id_dsa
tp-login1.ci.uchicago.edu.passphrase=XXXXXXXX

We have used falkon and coasters before for multi-core configurations.
 but for a single multi-core machine, i believe you can get away with
having multiple entries of the same host in the sites.xml file using
the ssh-provider.

ie:

<config>
<pool handle="CORE0">
   <execution provider="ssh"... />
   ...
</pool>
<pool handle="CORE1">
   ...
</pool>
</config>

2009/6/12 Michael Wilde <wilde at mcs.anl.gov>:
> Ah, very cool. Im eager to get more user experience feedback on multicore
> use.
>
> So I will try to hunt down my examples of .ssh configs.
>
> Also, Allan Espinosa used this recently. Allan, can you post details and
> examples?
>
> Thanks!
>
> Mike
>
> On 6/12/09 2:06 PM, Andriy Fedorov wrote:
>>
>> Michael,
>>
>> Thank you for the advice, I will look into this. This is very helpful.
>> I had an impression Lava is not included in the list of schedulers
>> supported out of the box, but wanted to check.
>>
>> Just a clarification -- I need to access two different types of local
>> resources. Cluster (via Lava or Condor) is one, but for the multicore
>> nodes we have on the network, which are not part of cluster, the only
>> option is to use ssh.
>>
>> AF
>>
>>
>>
>> On Fri, Jun 12, 2009 at 2:52 PM, Michael Wilde<wilde at mcs.anl.gov> wrote:
>>>
>>> Andriy,
>>>
>>> Ben or Mihael may have better ideas, but I offer my thoughts below.
>>>
>>> On 6/12/09 1:18 PM, Andriy Fedorov wrote:
>>>>
>>>> Hi,
>>>>
>>>> I am trying to set up Swift with the local cluster and non-cluster
>>>> resources in our lab. Here some configuration details.
>>>>
>>>> Due to technical problems, passphrase login is not possible for the
>>>> nodes on local network, and I need to enter password each time.
>>>>
>>>> For the cluster, I was able to set up passphrase login for the head
>>>> node. The cluster is running Lava and Condor schedulers at the same
>>>> time, but Lava should be used if possible.
>>>>
>>>> Two questions:
>>>>
>>>> (1) is it possible to configure Swift to talk to Lava scheduler?
>>>
>>> Making Swift talk to a new scheduler means writing a new CoG provider (in
>>> Java). You can likely use an existing "data" provider like "local"; you
>>> could model the "execution" provider after the "PBS" provider. How hard
>>> this
>>> is depends on how close Lava is to PBS in nature. (I dont know it). And
>>> the
>>> provider interface you need to code to is not well documented afaik.
>>>
>>> I would try the Condor provider. While that provider is less mature and
>>> tested than others, it should work, and if it doesnt, we should try to
>>> fix
>>> it.
>>>
>>> If possible, make sure a simple condor_submit hello-world works for you
>>> first.
>>>
>>> Run swift on the head/login node; use the "local" data provider.
>>>
>>> Another route is to use Falkon, but that will be harder and its less
>>> supported, so I suggest against this until easier routes are exhausted.
>>>
>>> I dont think that ssh will get you far, as to leverage the cluster I
>>> think
>>> you'd need to describe each worker node with a separate sites.xml entry.
>>> Thats fine in principle, but a bit awkward, and may have scheduling
>>> issues
>>> (ie if ssh hangs or dies when you dont own the node).
>>>
>>> Save ssh as another last resort; I suggest trying Condor first.
>>>
>>> If needed, people who used ssh recently can send you the info below.
>>>
>>> - Mike
>>>
>>>> (2) I am following the instructions on setting up ssh site provider to
>>>> use nodes on the local network.
>>>>  (2.1) do I need to set up auth.defaults even if I have ssh-agent
>>>> running, and can ssh to the remote node without being asked for
>>>> password?
>>>>  (2.2.) can anybody give me more detailed instructions on how to set
>>>> up auth.defaults? I cannot make it work.
>>>
>>>> Thanks
>>>>
>>>> Andriy Fedorov
>>>> _______________________________________________



-- 
Allan M. Espinosa <http://allan.88-mph.net/blog>
PhD student, Computer Science
University of Chicago <http://people.cs.uchicago.edu/~aespinosa>