关于python：django.db.utils.OperationalError无法连接到服务器

django.db.utils.OperationalError Could not connect to server

我不知道怎么解决这个问题

我不知道当我尝试runserver时为什么会出现这种错误：

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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：

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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"?

设置：

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