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90 lines
2.2 KiB
ReStructuredText
90 lines
2.2 KiB
ReStructuredText
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.. _qp_tunnel:
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=========
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qp_tunnel
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=========
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.. TODO
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.. program:: qp_tunnel
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Establishes a tunnel to allow communications between machines within
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different networks, for example multiple MPI slave jobs running on
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different clusters.
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Usage
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-----
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.. code:: bash
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qp_tunnel [-g] (ADDRESS|EZFIO_DIR)
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``EZFIO_DIR`` is the name of the |EZFIO| directory containing the data,
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and ``ADDRESS`` is the address of another tunnel.
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.. option:: -h, --help
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Displays the help message
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.. option:: -g, --get-input
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Download the EZFIO directory from the remote instance of qp_tunnel.
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Example
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-------
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.. code:: text
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+-------------------+ +------------------+
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| N1_1 N1_2 N1_3 | | N2_1 N2_2 N2_3 |
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| | | | | | | | | |
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| +----+----+ | | +----+----+ |
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| C1 F1 | | F2 C2 |
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| +---------=----=--------+ |
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+-------------------+ +------------------+
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Imagine you have two clusters, C1 and C2. Each cluster is accessible via SSH
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on a front-end named respectively F1 and F2. Groups of nodes N1 and N2 have
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been reserved by the batch scheduling system on both clusters.
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Each node in N1 is on the same network as the other nodes of N1, but they
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can't access the network on which the nodes of N2 are.
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1) Start a parallel simulation on the cluster C1, running on nodes N1.
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We assume that there is a shared file system, such that F1 can access
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the EZFIO directory. We also assume that F1 can communicate with the
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nodes of N1.
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2) Run a tunnel on the front-end F1 and keep it running:
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.. code:: bash
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me@f1 $ qp_tunnel my_directory.ezfio
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Connect to:
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tcp://31.122.230.47:42379
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Ready
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3) On the front-end F2, run another instance connecting to the other one,
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which will fetch the |EZFIO| directory:
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.. code:: bash
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me@f2 $ qp_tunnel --get-input tcp://31.122.230.47:42379
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Connect to:
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tcp://31.122.209.139:42379
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Communication [ OK ]
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Getting input... my_directory.ezfio ...done
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Ready
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4) Keep the tunnel running, and you can now run a slave simulation within the
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nodes N2.
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