postgresql - psql : error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL: Peer authentication failed for user "postgres" (Ubuntu)

Question

当我尝试打开 psql使用此命令:

psql -U postgres

我收到此错误:

psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL:  Peer authentication failed for user "postgres"

但是当我使用它时它连接成功:

sudo -u postgres psql

有人可以解释发生了什么以及如何诊断/解决这个问题吗？我的 pg_hba.conf包含以下内容:

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

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     md5
# IPv4 local connections:
host    all             all             127.0.0.1/32            scram-sha-256
# IPv6 local connections:
host    all             all             ::1/128                 scram-sha-256
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer

Answer 1

Peer authentication表示只有当数据库用户名与操作系统用户名相同时才允许连接。
所以如果你运行 psql -U postgres作为操作系统用户root或 jimmy ，它不会工作。
您可以指定 mapping pg_ident.conf 中的操作系统用户和数据库用户之间的.