postgres不允许alter role superuser和我的默认用户不是超级用户

Question

我无法使用elixir连接到postgres：

** (Mix) The database for PhoenixChat.Repo couldn't be created: FATAL 28P01 (invalid_password): password authentication failed for user "postgres"

00:08:59.053 [error] GenServer #PID<0.3214.0> terminating
** (Postgrex.Error) FATAL 28P01 (invalid_password): password authentication failed for user "postgres"
    (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: nil
State: Postgrex.Protocol

我无法理解数据库如何允许用户在没有超级用户的情况下制作用户。从我的普通用户，它不允许给予超级用户角色：

$ psql -U thisone --password
Password for user thisone: 
psql: FATAL:  Peer authentication failed for user "thisone"

$ psql -U fakeuser
psql: FATAL:  Peer authentication failed for user "fakeuser"

cchilders=> alter user postgres superuser;
ERROR:  must be superuser to alter superusers
cchilders=> select rolname from pg_roles;
  rolname  
-----------
 postgres
 cchilders
 fakeuser
 thisone
(4 rows)

$ psql -U postgres --password
Password for user postgres: 
psql: FATAL:  Peer authentication failed for user "postgres"

如果没有超级用户，如何在postgres中为用户提供超级用户？

Answer 1

psql: FATAL: Peer authentication failed for user "thisone"和其他用户的相同错误意味着，你尝试使用不同的os用户连接套接字（例如，os用户是cchilders，你尝试psql -U postgres），而peer means you have to be logged in same OS user。例如，要在psql -U thisone成功，你应该在sudo su - thisone之前。如果你没有这样的OS用户，你就无法连接peer身份验证。因此要么将hba_file peer更改为trust进行无密码，要么将md5更改为密码身份验证，以使postgres不是同一个os用户...

为你sudo -u postgres psql工作，因为你有os用户postgres（例如osx不是这种情况）..

最后，您列出了用户，而不是检查他们是否是超级用户。你应该使用\du metacommand和psql, or addrolsuper`列，所以它将是：

select rolname from pg_roles where rolsuper;