[mpich-discuss] MPICH2 for ARM

[Harald Schuster]

Hi

I am using neither ubuntu/debian nor Fedora/Redhat. I am using a self 
made kernel with buildroots for an microcontroller. But I found my 
Problem and so I am now able to start ssh on the controller and I am 
able to connect the both controllers via SSH. When I start the example 
from MPICH2 (cpi) with the two controllers as hosts I see on the passive 
conttroller that an ssh connection is set up and that he starts the  
hydra process manager. But then the active controller write "unable to 
get host address" and "unable to connect to server da830 at port 45409". 
Firewall is not active.

Harald

On 23.11.2011 09:05, Pavan Balaji wrote:
>
> Which Linux variant are you using? For Ubuntu/Debian, do:
>
> % sudo apt-get install openssh-server openssh-client
>
> For Fedora/Redhat, you'll need to do sudo yum install 
> some-ssh-package. Try google.
>
>  -- Pavan
>
> On 11/22/2011 08:50 AM, Harald Schuster wrote:
>> Hi
>>
>> I know taht this is not a mpich2 question but i dont know where to
>> search for help. After a lot of unsuccessfully test ssh is not running
>> yet. I installed the openssh packet by the make menuconfig command in
>> the buildroot. Then I create a new root file system with the buildroot.
>> That works and the linux now knows the ssh command. When i go to
>> /etc/init.d I found S50sshd and I executed ./S50sshd restart. After
>> restarting he said ok but it doesn't works. When I start ssh
>> root at localhost i got an connection refused message. Is there a special
>> configuration necessary?! It is all running on a arm controller.
>>
>> Best regards
>> Harald
>>
>>
>> On 18.11.2011 17:34, Pavan Balaji wrote:
>>> Hello,
>>>
>>> On 11/18/2011 07:10 AM, Harald Schuster wrote:
>>>> So with the MPICH2 version 1.3.2 it works fine when I start the
>>>> applications with -launcher fork. This is a big step forward and my 
>>>> next
>>>> step is do start to controllers and let them communicate together. 
>>>> Until
>>>> now it is possible to ping one controller from the other but i can not
>>>> start Mpi via ssh. I installed openssh with make menuconfig in the
>>>> buildroot butI always get the error “connection refused”. Do I need to
>>>> include ssh in the kernel? I think it is a problem with the
>>>> configuration of ssh but i have to lock. If you have any advice please
>>>> write back. Thanks
>>>
>>> This is not really an MPICH2 related question, but I'll answer it
>>> anyway. In the future, you might want to try other mailing lists that
>>> help you with networking setup on your cluster.
>>>
>>> 1. I believe you need to install both openssh-server and
>>> openssh-client. The openssh-client part gives you the "ssh" executable
>>> and the server part gives you the "sshd" daemon that runs on all the
>>> nodes. Once you install it, it should automatically start up; no extra
>>> settings should be required. For example, on Ubuntu/Debian you can do
>>> "sudo apt-get install openssh-server openssh-client".
>>>
>>> 2. You should setup password-less ssh. You should be able to google
>>> for "ssh passwordless" and find a zillion links to tutorials on how to
>>> do this.
>>>
>>> 3. Make sure your firewall is disabled. On Ubuntu/Debian, you can
>>> disable it with "sudo ufw disable". On other platforms, google is your
>>> friend.
>>>
>>> Once your ssh is setup fine, MPICH2 should automatically be able to
>>> use it to launch processes remotely.
>>>
>>>   -- Pavan
>>
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