Cannot rebuild following site failure: "postgres already running"

Product Support Self-hosting
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I’m hitting this with Docker 1.7.1 and the latest version of Discourse. I want to rebuild because I get this in the performance reports thread:

Report is only available in latest image, please run:
cd /var/discourse
./launcher rebuild app

The error is:


I, [2015-09-16T13:19:11.708621 #39]  INFO -- : > socat /dev/null UNIX-CONNECT:/shared/postgres_run/.s.PGSQL.5432 || exit 0 && echo postgres already running stop container ; exit 1
I, [2015-09-16T13:19:11.721860 #39]  INFO -- : postgres already running stop container



FAILED
--------------------
RuntimeError: socat /dev/null UNIX-CONNECT:/shared/postgres_run/.s.PGSQL.5432 || exit 0 && echo postgres already running stop container ; exit 1 failed with return #<Process::Status: pid 46 exit 1>
Location of failure: /pups/lib/pups/exec_command.rb:105:in `spawn'
exec failed with the params "socat /dev/null UNIX-CONNECT:/shared/postgres_run/.s.PGSQL.5432 || exit 0 && echo postgres already running stop container ; exit 1"
323124ae8ceb4b35d3e926876f605fa71d5e5fe308a1ab18b9d1f8072b3fff6b
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one

The forum itself is working but I’d like to have the performance reports as well…