Re: BUG #9003: Hard-coding to localhost in postmaster

On Tue, Jan 28, 2014 at 02:46:52PM -0500, Paul Morie wrote:
> Apologies: I should have explained more of the context in my original post to this list.
> I work for Red Hat on OpenShift and discovered this while investigating error messages
> in the postgres logs (the bug report in OpenShift: https://bugzilla.redhat.com/show_bug.cgi?id=1024676).
> Since it impacts the autovacuum functionality for our users, I wanted to see if I could
> get an upstream fix.
>
> In OpenShift, user processes run inside a 'gear' - which has its own /etc/passwd entry,
> selinux context, etc. Each gear user gets a 127.x.x.x loopback device to bind to so it
> can all use the same ports like 8080 for web traffic, 5432 for postgres.  That's only
> possible if each gear gets its own unique loopback address.  Binding to
> localhost/127.0.0.1 is explicitly disallowed.
>
> We are not currently using network namespaces in OpenShift because they were not available
> in the RHEL kernel until 6.5 (released Nov 2013).  Now that they're supported, using them
> in OpenShift is one of our high-priority items.
>
> Hope that clarifies why I would be interested in this option :)

Based on your setup, why would you not DNS-map "localhost" to whatever
127.x.x.x address you gave that gear?  We specifically bind to the
"localhost" string and not 127.0.0.1.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +