无法连接到 PostgreSQL 服务器:致命:用户 "postgres" 的对等身份验证失败

Unable to connect to PostgreSQL server: FATAL: Peer authentication failed for user "postgres"

如何从 admin 访问 postgres 数据库?

我已经更改了用户 postgres:

的密码
$ sudo -u postgres psql
$ postgres=# alter user postgres password 'secret';

结果:

ALTER ROLE

但我仍然在管理员上收到此错误:

Unable to connect to PostgreSQL server: FATAL: Peer authentication failed for user "postgres"

知道为什么吗?

我有这两个用户:

postgres=# \du
                                   List of roles
 Role name |                         Attributes                         | Member of 
-----------+------------------------------------------------------------+-----------
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
 root      | Superuser, Create role, Create DB                          | {}

但我在使用此命令创建用户 root 时没有设置密码:

sudo -u postgres createuser --interactive

输出(为什么不要求输入密码?):

Enter name of role to add: root
Shall the new role be a superuser? (y/n) y

但我仍然收到管理员错误:

Unable to connect to PostgreSQL server: FATAL: Peer authentication failed for user "root"

编辑:

这是我的一些 pg_hba.conf

sudo nano /etc/postgresql/9.5/main/pg_hba.conf

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            md5
#host    replication     postgres        ::1/128                 md5

我把peer改成ident:

# Database administrative login by Unix domain socket
local   all             postgres                                ident

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     ident
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            md5
#host    replication     postgres        ::1/128                 md5

然后重启我的机器。但仍然没有运气。

看起来您正在使用 "peer authentication" 而您希望使用 "password authentication"。使用默认 pg_hba.conf,您可以通过指定主机名或“127.0.0.1”来切换到密码验证。

查看Postgres documentation for authentication methods

我的答案来自 here

local   all             postgres                                md5

然后重启服务:

sudo systemctl restart postgresql.service