[StarCluster] Port Forwarding Plugin

[Justin Riley]

Hey Chris,

Once again, my apologies for the delay. I think using
node.ssh.execute_async should solve your immediate problem with the
plugin but I will test this and get back to you with details on why.

Taking a step back, I don't think this plugin is really necessary. I
already, by default, allow all traffic between nodes in the cluster's
security group so mongo should be able to listen on the public interface
(ie master:$port) and be accessible to all nodes without being wide open
to the world. I just looked at the docs and this clearly needs to be
documented. Added an issue[1] so I don't forget to add it in.

HTH,

~Justin

[1] https://github.com/jtriley/StarCluster/issues/132

On Thu, Jun 21, 2012 at 10:36:22AM -0400, Chris Diehl wrote:
>    Hi All,
>    I wrote a plugin yesterday to do port forwarding from a specified port on
>    the master to all of the nodes. The goal is to have a DB such as Mongo
>    running on the master and available on the specified port on all the
>    nodes.
>    For whatever reason, when the cluster is firing up, the process grinds to
>    a halt when it is running this plugin.
>    Any thoughts on what might be the cause? I've tried it both with a port
>    value passed in and specified in the code. I can execute the ssh command
>    below successfully on the nodes. I used nmap to check if I was using a
>    port that I should not be. Everything seems good but clearly something is
>    not working as intended.
>    Thanks, Chris
>    from starcluster.clustersetup import ClusterSetup
>    from starcluster.logger import log
>    class MongoPortForwarding(ClusterSetup):
>        def __init__(self, port):
>            self.port = port
>            log.debug("port = %s" % port)
> 
>        def run(self, nodes, master, user, user_shell, volumes):
>            [1]log.info("Number of nodes: %d" % len(nodes))
>            for node in nodes:
>                if node != master:
>                    [2]log.info("Setting up port forwarding for node %s." %
>    node.alias)
>                    #node.ssh.execute("ssh -f -N -L %s:localhost:%s
>    root at master" % (self.port,self.port))
>                    node.ssh.execute("ssh -f -N -L 1234:localhost:1234
>    root at master")
> 
> References
> 
>    Visible links
>    1. http://log.info/
>    2. http://log.info/

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