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SSH
===
It is easy to set up Dask on informally managed networks of machines using SSH.
This can be done manually using SSH and the
Dask :doc:`command line interface <deploying-cli>`,
or automatically using either the :class:`dask.distributed.SSHCluster` Python *cluster manager* or the
``dask-ssh`` command line tool. This document describes both of these options.
.. note::
Before instaniating a ``SSHCluster`` it is recommended to configure keyless SSH
for your local machine and other machines. For example, on a Mac to SSH into
localhost (local machine) you need to ensure the Remote Login option is set in
System Preferences -> Sharing. In addition, ``id_rsa.pub`` should be in
``authorized_keys`` for keyless login.
Python Interface
----------------
.. currentmodule:: dask.distributed
.. autofunction:: SSHCluster
Command Line
------------
The convenience script ``dask-ssh`` opens several SSH connections to your
target computers and initializes the network accordingly. You can
give it a list of hostnames or IP addresses::
$ dask-ssh 192.168.0.1 192.168.0.2 192.168.0.3 192.168.0.4
Or you can use normal UNIX grouping::
$ dask-ssh 192.168.0.{1,2,3,4}
Or you can specify a hostfile that includes a list of hosts::
$ cat hostfile.txt
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
$ dask-ssh --hostfile hostfile.txt
.. note::
The command line documentation here may differ depending on your installed
version. We recommend referring to the output of ``dask-ssh --help``.
.. click:: distributed.cli.dask_ssh:main
:prog: dask-ssh
:show-nested:
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