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https://issues.apache.org/jira/browse/COUCHDB-393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Chesneau resolved COUCHDB-393.
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Fix Version/s: 1.0
Resolution: Fixed
committed in last trunk.
> Cannot discover currently running http port if ini file specifies port 0
> ------------------------------------------------------------------------
>
> Key: COUCHDB-393
> URL: https://issues.apache.org/jira/browse/COUCHDB-393
> Project: CouchDB
> Issue Type: Improvement
> Components: HTTP Interface
> Affects Versions: 0.9
> Environment: Ubuntu 9.04
> Reporter: Stuart Langridge
> Assignee: Noah Slater
> Priority: Blocker
> Fix For: 0.12, 1.0
>
> Attachments: couch_uri.patch, couchctl.patch
>
>
> It is currently not possible, if the ini file specifies port 0 as the http
> port (so that the OS chooses a random port) to discover which port the OS
> actually chose.
> It would be nice if the currently running port was made available in the
> statusline output (couchdb -s), but a log statement would be adequate; some
> way that an external script can discover which port a running CouchDB is
> listening on.
> Edited discussion from #couchdb:
> <bitdiddle> aquarius: well at a glance it appears couch_http passes the 0 to
> mochiweb_http which passes it to the mochiweb_socket_server, which passes it
> to gen_tcp, an erlang module that lets the underlying OS assign it.
> mochiweb_socket_server then grabs that port and stores it. It has a get
> method to retrieve properties but that needs to be exposed to mochiweb_http
> so it would take a little work to do it. It's probably a JIRA ticket, unless
> someone else sees a quicker approach
> <davisp> bitdiddle: you got that far and didn't find it?
> <aquarius> davisp: is there a better way to find the port?
> <davisp> oh, is that not the bind port?
> I was just thinking a log statement
> <aquarius> davisp: the problem is if you specify 0 as the bind port (so the
> OS chooses a port), how do you find out what was chosen?
> <davisp> aquarius: you have to look at the port returned by the socket
> aquarius: in other words, CouchDB was never written to do that
> <davisp> AFAIK
> <bitdiddle> davisp: I found it, just needs some work to expose it
> <davisp> aquarius: and by do that, I mean, we never put in a statement to log
> that
> <bitdiddle> mochiweb_http is the module that needs to bubble it up
> <aquarius> davisp: I don't really mind whether it's a log statement or it's
> exposed to couchdb -s (the latter seems tidier to me, but whichever), I just
> want to be able to start couch on port 0 and then later find out which port
> got chosen :)
> <davisp> aquarius: for the time being you can use something like netstat or
> lsof, but we'll get a log statement in there or something
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