PostgreSQL一些简单问题以及解决办法

问题：
org.postgresql.util.PSQLException: Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
解决办法：Edit /var/lib/pgsql/data/postgresql.conf file
Change
#listen_addresses = 'localhost'
to 
listen_addresses = '*'

问题：
org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "<host_ip>", user "fkong", database "fkong", SSL off
解决办法：
Edit /var/lib/pgsql/data/pg_hba.conf file
Add below line under "# IPv4 local connections:"
"host    all         all         <host_ip>/32         password"
或者

"host    all         all         0.0.0.0/0                 trust"
问题：
org.postgresql.util.PSQLException: FATAL: Ident authentication failed for user "fkong"
解决办法：
Edit /var/lib/pgsql/data/pg_hba.conf file
Change 
"host    all         all         <host_ip>/32         ident"
to 
"host    all         all         <host_ip>/32         password"