Postgres server fails because of hostname + CIDR

[Marco Ceppi]

When troubleshooting issues with the charm, the following occurs

2013-02-06 17:45:40 UTC LOG: specifying both host name and CIDR mask is invalid: "ip-10-4-81-12.ec2.internal/32"
2013-02-06 17:45:40 UTC CONTEXT: line 9 of configuration file "/etc/postgresql/9.1/main/pg_hba.conf"
2013-02-06 17:45:40 UTC FATAL: could not load pg_hba.conf

The pg_hba.conf looks like this:

#------------------------------------------------------------------------------
# This file is managed by Juju
#------------------------------------------------------------------------------

# Database administrative login by UNIX sockets
local all postgres ident map=superusers

host discourse db_2_discourse_0_schema ip-10-4-81-12.ec2.internal/32 md5

[Marco Ceppi (marcoceppi)]

Not all environments provide an IP address or a hostname[1]. `private-address` can be either. The hook needs to verify if it's an IP address and append the /32 when passing the ip address to the template.

[1]: http://meta.discourse.org/t/deploying-discourse-to-amazon-and-other-clouds/1632/14