PostgreSQL新手上路PG::ConnectionBad (FATAL: Peer authentication failed

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部署完的新机器报错

App 12595 stderr: PG::ConnectionBad (FATAL:  Peer authentication failed for user "dbuser"
App 12595 stderr: ):

回忆一下整个数据库的搭建过程

（1）创建数据库用户dbuser，并指定为超级用户

sudo -u postgres createuser --superuser dbuser

sudo -u postgres createdb -O dbuser uppers_staging

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

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

（4）登录查看下数据库

# 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)

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              | {}

 GRANT ALL PRIVILEGES ON DATABASE uppers_staging to dbuser;

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)

常见的操作命令如下

\h：查看SQL命令的解释，比如\h select。
\?：查看psql命令列表。
\l：列出所有数据库。
\c [database_name]：连接其他数据库。
\d：列出当前数据库的所有表格。
\d [table_name]：列出某一张表格的结构。
\du：列出所有用户。
\e：打开文本编辑器。
\conninfo：列出当前数据库和连接的信息。

PostgreSQL新手上路PG::ConnectionBad (FATAL: Peer authentication failed

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原文地址：http://blog.csdn.net/shiralwz/article/details/47980035