PostgreSQL Novice Road Pg::connectionbad (fatal:peer authentication failed

New machine error after deployment

App 12595 Stderr:pg::connectionbad (FATAL:  Peer authentication failed for user "Dbuser" app 12595 stderr:):

Surf the internet for a bit, many of the posts are said to modify/etc/postgresql/9.4/main/pg_hba.conf this file configuration, but it is not a good use

Recall the entire database building process

(1) Create database user Dbuser, and specify as Superuser

Sudo-u postgres CreateUser--superuser dbuser

(2) Create a database uppers_staging and specify that its owner is Dbuser

Sudo-u postgres createdb-o dbuser uppers_staging

(3) to Dbuser set the login password, not set before the time reported this error psql:fe_sendauth:no password supplied, set after the error

# sudo -u postgres psql
psql (9.4.4)
Type "help" for help.

postgres=# \password dbuser
Enter new password: 
Enter it again: 
postgres=# \q

(4) Log in to view the database

# psql -U dbuser -d uppers_staging -h 127.0.0.1 
Password for user dbuser: 
psql (9.4.4)
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type "help" for help.

uppers_staging=> \l
                                      List of databases
        Name        |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
--------------------+----------+----------+-------------+-------------+-----------------------
 postgres           | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 template0          | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
                    |          |          |             |             | postgres=CTc/postgres
 template1          | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
                    |          |          |             |             | postgres=CTc/postgres
 uppers_development | root     | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 uppers_staging     | dbuser   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
(5 rows)

Permissions for Dbuser

uppers_staging=> \du
                             List of roles
 Role name |                   Attributes                   | Member of 
-----------+------------------------------------------------+-----------
 dbuser    |                                                | {}
 postgres  | Superuser, Create role, Create DB, Replication | {}
 root      | Superuser, Create role, Create DB              | {}

The next step is to assign all permissions for the database uppers_staging to Dbuser, otherwise dbuser only permissions to log on to the console, without permission to manipulate the database

GRANT all privileges on the DATABASE uppers_staging to Dbuser;

Now look at the database and the permissions change.

uppers_staging=> \l
                                      List of databases
        Name        |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
--------------------+----------+----------+-------------+-------------+-----------------------
 postgres           | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 template0          | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
                    |          |          |             |             | postgres=CTc/postgres
 template1          | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
                    |          |          |             |             | postgres=CTc/postgres
 uppers_development | root     | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 uppers_staging     | dbuser   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =Tc/dbuser           +
                    |          |          |             |             | dbuser=CTc/dbuser
(5 rows)

In fact, the reason for the error is no authorization

The common operations commands are as follows

\ h: View the explanation of SQL commands, such as \ h select.
\ ?: View the list of psql commands.
\ l: List all databases.
\ c [database_name]: Connect to another database.
\ d: List all tables in the current database.
\ d [table_name]: List the structure of a table.
\ du: List all users.
\ e: Open a text editor.
\ conninfo: List information about the current database and connection. 

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

PostgreSQL Novice Road Pg::connectionbad (fatal:peer authentication failed