django.db.utils.OperationalError 无法连接到服务器 [英] django.db.utils.OperationalError Could not connect to server

问题描述

我不知道如何解决这个问题

I am not sure how to fix this issue

当我尝试 runserver 时，我不知道为什么会出现此错误:

I have no idea why I am getting this error when I try to runserver:

Performing system checks...

System check identified no issues (0 silenced).
Unhandled exception in thread started by <function wrapper at 0x1085589b0>
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/django/utils/autoreload.py", line 222, in wrapper
    fn(*args, **kwargs)
  File "/Library/Python/2.7/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run
    self.check_migrations()
  File "/Library/Python/2.7/site-packages/django/core/management/commands/runserver.py", line 159, in check_migrations
    executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
  File "/Library/Python/2.7/site-packages/django/db/migrations/executor.py", line 17, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/Library/Python/2.7/site-packages/django/db/migrations/loader.py", line 49, in __init__
    self.build_graph()
  File "/Library/Python/2.7/site-packages/django/db/migrations/loader.py", line 184, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "/Library/Python/2.7/site-packages/django/db/migrations/recorder.py", line 59, in applied_migrations
    self.ensure_schema()
  File "/Library/Python/2.7/site-packages/django/db/migrations/recorder.py", line 49, in ensure_schema
    if self.Migration._meta.db_table in self.connection.introspection.get_table_list(self.connection.cursor()):
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 165, in cursor
    cursor = self.make_debug_cursor(self._cursor())
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 138, in _cursor
    self.ensure_connection()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 133, in ensure_connection
    self.connect()
  File "/Library/Python/2.7/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 133, in ensure_connection
    self.connect()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 122, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/Library/Python/2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 134, in get_new_connection
    return Database.connect(**conn_params)
  File "/Library/Python/2.7/site-packages/psycopg2/__init__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: could not connect to server: Connection refused
        Is the server running on host "127.0.0.1" and accepting
        TCP/IP connections on port 5432?

当我尝试连接到 postgres 时:

When I try to connect to postgres:

psql: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

settings.py:

settings.py:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'beerad',
        'USER': 'bli1',
        'PASSWORD': '',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    }
}

推荐答案

可能是一些问题:

1. PostgreSQL 没有运行.用 sudo service postgresql status
检查它

2. 您的 PostgresSQl 未在端口 5432 上运行.您可以输入 sudo netstat -nl | 检查它.grep postgres

您在尝试连接到您的数据库时出现错误，例如用户名、密码或数据库名称.检查它们是否是 postgres 要求您连接的内容，以及您要访问的 db_name.

You have something wrong trying to connect to your db like the username, the password or the databasename. Check that they are what postgres ask for you to connect it and that is the db_name that you want to access to.

postgres 中 postmaster.pid 的问题.它可能是由于关闭不当而发生的.它会提醒一个不允许您的服务器启动的 pid 活动.要修复它，您必须:

Problems with postmaster.pid in postgres. It can happen because of a shutdown unproperly done. It makes to remind a pid alive that doesn't allow your server start. To fix it you have to:

 * rm /usr/local/var/postgres/postmaster.pid 
 * pg_resetxlog -f /usr/local/var/postgres

在此之后，如果您制作 postgres 的运行服务器，它应该可以正常运行

After this it should run properly if you make the runserver of postgres

Mac OSX 中的帮助:如何启动 PostgreSQL 服务器Mac OS X?

Help in Mac OSX: How to start PostgreSQL server on Mac OS X?

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