服务器是否在本地运行并接受 Unix 域套接字“/var/run/postgresql/.s.PGSQL.5432”上的连接？

Question

执行以下命令时遇到主题中的错误。

heroku run python manage.py db upgrade

conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

该应用在本地服务器上完美运行，但无法使用 postgres db 迁移到 heroku。

尝试了无数的解决方案，仍然没有任何效果。

启动数据库时，出现以下消息

aiting for server to start....2020-10-11 20:14:58.637 +04 [11244] LOG:  starting PostgreSQL 13.0 on x86_64-apple-darwin19.4.0, compiled by Apple clang version 11.0.0 (clang-1100.0.33.8), 64-bit
2020-10-11 20:14:58.641 +04 [11244] LOG:  listening on IPv6 address "::1", port 5432
2020-10-11 20:14:58.641 +04 [11244] LOG:  listening on IPv4 address "127.0.0.1", port 5432
2020-10-11 20:14:58.644 +04 [11244] LOG:  listening on Unix socket "/tmp/.s.PGSQL.5432"
2020-10-11 20:14:58.672 +04 [11246] LOG:  database system was interrupted; last known up at 2020-10-11 20:11:13 +04
2020-10-11 20:14:59.020 +04 [11246] LOG:  database system was not properly shut down; automatic recovery in progress
2020-10-11 20:14:59.034 +04 [11246] LOG:  redo starts at 0/1671320
2020-10-11 20:14:59.034 +04 [11246] LOG:  invalid record length at 0/1671358: wanted 24, got 0
2020-10-11 20:14:59.034 +04 [11246] LOG:  redo done at 0/1671320
2020-10-11 20:14:59.067 +04 [11244] LOG:  database system is ready to accept connections
 done
server started

Answer 1

你只需要重新启动服务器的 psql。小心这个数据库：

sudo service postgresql restart

我突然遇到了同样的错误。它解决了。它与 psycopg2.connect(dsn) 无关

Answer 2

问题是；来自错误 '"/var/run/postgresql/.s.PGSQL.5432"?"，而不是来自日志 "listening on Unix socket "/tmp/.s.PGSQL.5432"。首先，我会尝试将您的DSN 更改为使用host=，这样您就不会尝试连接到套接字。然后你需要理清为什么psycopg2 正在寻找不同的套接字。通常，当它在一个将套接字置于/var/run/ 的发行版上针对libpq 编译/使用，然后在另一个套接字位于/tmp/ 的发行版上运行时，就会发生这种情况。