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    <p>The basic idea is:</p> <ul> <li>Bind to port 0.</li> <li>Ask the socket which port you ended up with.</li> <li>Report that port somehow.</li> </ul> <p>The first part depends radically on how you're building, starting, and configuring your servers. CherryPy is hugely flexible, and the details will be different depending on how you're using it.</p> <p>The second part requires that you be using some mechanism where you're writing the top-level code that starts the servers, and <em>not</em> one of the mechanisms that starts them automatically without any of your code. That's because, before starting the server, you will need to manually <a href="http://docs.cherrypy.org/dev/refman/wsgiserver/init.html#cherrypy.wsgiserver.HTTPServer.bind" rel="nofollow"><code>bind</code></a> the server to get its socket. Once you have a created and bound socket, <a href="http://docs.python.org/3/library/socket.html#socket.socket.getsockname" rel="nofollow"><code>getsockname</code></a> will give you the address and port it ended up bound to.</p> <p>The third part can obviously be as easy or as hard as you want.</p> <hr> <p>Here's a trivial example, which you can even do from the interactive interpreter:</p> <pre><code>def app(env, start): start('200 OK', [('Content-type', 'text/plain')]) return ['Hello, world!'] server = cherrypy.wsgiserver.CherryPyWSGIServer(('0.0.0.0', 0), app, server_name='localhost') server.bind(socket.AF_INET, socket.SOCK_STREAM) addr, port = server.socket.getsockname() print(port) server.start() </code></pre> <hr> <p>You may also want to take a look at <a href="https://cherrypy.readthedocs.org/en/latest/pkg/cherrypy.process.html?highlight=serveradapter#cherrypy.process.servers.ServerAdapter" rel="nofollow"><code>cherrypy.process.servers</code></a> and its <code>ServerAdapter</code>, which lets you manage multiple servers from a single place, instead of having a bunch of independent servers that you have to manually coordinate.</p>
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    1. POCan I get CherryPy to find its own available port?
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    1. COSometimes I feel like we just "give away" solutions to problems "too easily". Good Answer however :)
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    2. CO@JamesMills: This only gives away the solution if he happens to be using a flat `CherryPyWSGIServer` with all configuration hard-coded in the source, which I really doubt he's using. My hope is that it's enough for him to figure out how to adapt to whatever he actually _is_ doing, and/or find the relevant information in the docs, and/or at least ask a better question…
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    3. CO*sigh* :) I do admit it though, you're answer was/is better phrased and oragnized than mine was :)
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