Dimuthu Upeksha created AIRAVATA-2687:

             Summary: Distributed agents on compute resources to communicate 
with Airavata server 
                 Key: AIRAVATA-2687
                 URL: https://issues.apache.org/jira/browse/AIRAVATA-2687
             Project: Airavata
          Issue Type: New Feature
            Reporter: Dimuthu Upeksha
            Assignee: Dimuthu Upeksha

Currently Airavata talk to compute resources through SSH communication. However 
there are scenarios where this might not work.
 # Airavata can not setup a SSH connection when the compute resource is set 
behind a firewall or the system administrators do not allow to create a SSH 
connections to the compute resource. 
 # Doing a burst of SSH call to a particular compute resource leads to the 
false detection of Airavata server doing DoS attack on the compute resource.

As an alternative, we think of an another approach to create the communication 
between Airavata server and the compute resource. Suggestion is to install an 
agent on the compute resource and agent creates a connection to the Airavata 
server when required. This might eliminate the firewall issue as the compute 
resource is the one which initiates the connection. Then Server can send 
commands. Communication protocol might be application specific but it should 
support both request response and fire and forget model.

However there challenges,
 # How does the agent find the Airavata server
 # What happens when an agent failed? How does Airavata server knows it?
 # When Airavata server needs to execute a command on a compute resource where 
an agent is installed, how does it find the correct agent connection?

At the first stage, we need to send linux commands to be executed on the 
compute resource and transfer files through the agent.



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