ostgreSQL: IDENT authentication failed for user postgres

出现这个问题是因为PostgreSQL的Client Authentication 使用了ident authentication. 
通过修改pg_hda.conf可以解决.
Ref: http://www.landui.com/docs/8.1/interactive/client-authentication.html

# Allow any user on the local system to connect to any database under
# any database user name using Unix-domain sockets (the default for local
# connections).
#
# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
local       all                    all                                                        trust

# The same using local loopback TCP/IP connections.
#
# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
host        all                    all               127.0.0.1/32                  trust