只要浏览到你的安装目录，并执行这个文件“pg_env.bat”，所以在bin文件夹和执行pgAdmin.exe。毫无疑问，这一定有用!

只要浏览到你的安装目录，并执行这个文件“pg_env.bat”，所以在bin文件夹和执行pgAdmin.exe。毫无疑问，这一定有用!

Note: textdb is the database which you are going to explore with 'alex' user 

root@kalilinux:~# sudo su - postgres 
postgres=#  psql   
postgres=#  create database testdb;
postgres=#  create user alex with password 'alex';
postgres=# GRANT ALL PRIVILEGES ON DATABASE testdb TO alex;`enter code here`

其他的答案都不能让我完全满意。以下是Xubuntu 12.04.1 LTS上postgresql-9.1的工作原理。

Connect to the default database with user postgres: sudo -u postgres psql template1 Set the password for user postgres, then exit psql (Ctrl-D): ALTER USER postgres with encrypted password 'xxxxxxx'; Edit the pg_hba.conf file: sudo vim /etc/postgresql/9.1/main/pg_hba.conf and change "peer" to "md5" on the line concerning postgres: local      all     postgres     peer md5 To know what version of postgresql you are running, look for the version folder under /etc/postgresql. Also, you can use Nano or other editor instead of VIM. Restart the database : sudo /etc/init.d/postgresql restart (Here you can check if it worked with psql -U postgres). Create a user having the same name as you (to find it, you can type whoami): sudo createuser -U postgres -d -e -E -l -P -r -s <my_name> The options tell postgresql to create a user that can login, create databases, create new roles, is a superuser, and will have an encrypted password. The really important ones are -P -E, so that you're asked to type the password that will be encrypted, and -d so that you can do a createdb. Beware of passwords: it will first ask you twice the new password (for the new user), repeated, and then once the postgres password (the one specified on step 2). Again, edit the pg_hba.conf file (see step 3 above), and change "peer" to "md5" on the line concerning "all" other users: local      all     all     peer md5 Restart (like in step 4), and check that you can login without -U postgres: psql template1 Note that if you do a mere psql, it will fail since it will try to connect you to a default database having the same name as you (i.e. whoami). template1 is the admin database that is here from the start. Now createdb <dbname> should work.

编辑:警告:请阅读埃文·卡罗尔发布的答案。看来这种方法不安全，不推荐使用。

在标准的Ubuntu 14.04 64位安装中，这对我来说是有效的。

我按照http://suite.opengeo.org/4.1/dataadmin/pgGettingStarted/firstconnect.html上的说明做了一些小修改

安装postgreSQL(如果你的机器上还没有安装):

Sudo apt-get安装postgresql

使用postgres用户运行psql

sudo –u postgres psql postgres

设置postgres用户的新密码:

\password postgres

退出 psql

\q

编辑/etc/postgresql/9.3/main/pg_hba.conf，修改如下:

使用Unix域套接字登录数据库 本地所有postgres peer

To:

使用Unix域套接字登录数据库 本地所有postgres md5

重启postgreSQL:

Sudo服务postgresql重启

创建一个新数据库

Sudo -u postgres createdb mytestdb

再次使用postgres用户运行psql:

psql –U postgres –W

列出现有的数据库(你的新数据库现在应该在那里):

\l

如果你像我一样运行macOS，你可能没有postgres用户。

当试图运行sudo -u postgres psql时，我得到了错误sudo: unknown user: postgres

幸运的是，postgres提供了可执行文件。

createuser -D /var/postgres/var-10-local --superuser --username=nick
createdb --owner=nick

然后我就可以毫无问题地访问psql了。

psql
psql (10.2)
Type "help" for help.

nick=#

如果您要从头创建一个新的postgres实例，下面是我所采取的步骤。我使用了一个非默认端口，因此可以运行两个实例。

mkdir /var/postgres/var-10-local
pg_ctl init -D /var/postgres/var-10-local

然后我用我喜欢的端口5433编辑/var/ postgresql.conf。

/Applications/Postgres.app/Contents/Versions/10/bin/postgres -D /Users/nick/Library/Application\ Support/Postgres/var-10-local -p 5433

createuser -D /var/postgres/var-10-local --superuser --username=nick --port=5433
createdb --owner=nick --port=5433

完成了!