1、 安装

root@dslab:/home/sil4# aptitude search postgresql

root@dslab:~# apt-get install postgresql-9.4

root@dslab:/home/sil4# apt-get install postgresql-client-9.4

2、配置

1）、修改 postgres 用户密码

sil4@dslab:/etc$ sudo passwd -d postgres //删除密码
passwd: password expiry information changed.

sil4@dslab:/etc$ sudo -u postgres passwd //修改密码
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

2）、修改 postgresql 数据库 配置

#vi/etc/postgresql/9.4/main/postgresql.conf

1.监听任何地址访问，修改连接权限

#listen_addresses=‘localhost’改为listen_addresses=‘*’

//如果想让Postgresql 监听整个网络的话，将 listen_addresses 前的#去掉，

并将 listen_addresses = 'localhost' 改 成 listen_addresses = '*'

4.数据库认证重新配置

$sudo vim /etc/postgresql/9.4/main/pg_hba.conf

*4.1
Replace:
# Database administrative login by Unix domain socket

local all postgres peer
To:
# Database administrative login by Unix domain socket

local all postgres trust

4.2
Replace:
# IPv4 local connections:

host all all 127.0.0.1/32 md5

To:
# IPv4 local connections:
host all all 127.0.0.1/32 trust

4.3
Replace:
# "local" is for Unix domain socket connections only
local all all peer(ident)

To:
# "local" is for Unix domain socket connections only
local all all trust

5.Restart DB

-- # /etc/init.d/postgresql restart

[ ok ] Restarting postgresql (via systemctl): postgresql.service. //成功

参考：

http://stackoverflow.com/questions/27211158/no-passwd-entry-for-user-postgres-error