django.db.utils.OperationalError：无法连接到服务器：没有这样的文件或目录

问题描述

我在settings.py中的数据库设置在

  DATABASES = {
'default'：{
'ENGINE'：'django.db.backends.postgresql_psycopg2'，
'NAME'：'dbname'，
'USER'：'postgres'，
'PASSWORD' postgres'，
'HOST'：''，
'PORT'：'8081'，
} 
} 
  

但是当运行python manage.py migrate
i我得到错误django.db.utils.OperationalError：无法连接到服务器：没有这样的文件或目录

 追溯（最近最近通话）：
文件/ home / vivekpradhan / joker / basket / local / lib / python3.4 / site-packages / django / db / backends / base / base.py，第130行，在ensure_connection 
 self.connect（）
文件/ home / vivekpradhan / joker / basket /本地/ lib / python3.4 / site-packages / django / db / backends / base / base.py，第119行，连接
 self.connection = self.get_new_conn ection（conn_params）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py，第176行，get_new_connection 
 connection = Database.connect（** conn_params）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/psycopg2/__init__.py，第164行，在连接
 conn = _connect（dsn，connection_factory = connection_factory，async = async）
 psycopg2.OperationalError：无法连接到服务器：没有这样的文件或目录
服务器在本地运行并接受
连接在Unix域套接字/var/run/postgresql/.s.PGSQL.8081？ 
 
 
上述异常是以下异常的直接原因：
 
追溯（最近的最后一次调用）：
文件manage.py ，第10行，<模块> 
 execute_from_command_line（sys.argv）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py，第338行，在execute_from_command_line 
 utility.execute（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py中，行330，执行
 self.fetch_command（子命令）.run_from_argv（self.argv）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django /core/management/base.py，第393行，在run_from_argv 
 self.execute（* args，** cmd_options）
文件/ home / vivekpradhan / joker / basket / local / lib / python3 .4 / site-packages / django / core / management / base.py，第444行，执行
 output = self.handle（* args，** options）
文件/ home / vivekpradhan /joker/basket/local/lib/python3.4/site-packages/django/core/management/commands/migrate.py，第93行，处理
 executor = MigrationExecutor（connection，self.migration _progress_callback）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/executor.py，第19行，__init__ 
自我.loader = MigrationLoader（self.connection）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/loader.py，第47行，在__init__ 
 self.build_graph（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/loader.py，行182，在build_graph 
 self.applied_migrations = recorder.applied_migrations（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/ recorder.py，第59行，apply_migrations 
 self.ensure_schema（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/ migrations / recorder.py，第49行，在ensure_schema 
如果self.Migration._meta.db_table在self.connection.introspection.table_names（self.connection.cursor（） ）：
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py，第162行，光标
 cursor = self.make_debug_cursor（self._cursor（））
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base。 py，第135行，_cursor 
 self.ensure_connection（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/ base / base.py，第130行，在ensure_connection 
 self.connect（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/ db / utils.py，第97行，__exit__ 
 six.reraise（dj_exc_type，dj_exc_value，traceback）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site -packages / django / utils / six.py，第658行，重新计算
 raise value.with_traceback（tb）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4 /site-packages/django/db/backends/base/base.py，第130行ure_connection 
 self.connect（）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py，第119行，连接
 self.connection = self.get_new_connection（conn_params）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/后端/ postgresql_psycopg2 / base.py，第176行，get_new_connection 
 connection = Database.connect（** conn_params）
文件/home/vivekpradhan/joker/basket/local/lib/python3.4 /site-packages/psycopg2/__init__.py，第164行连接
 conn = _connect（dsn，connection_factory = connection_factory，async = async）
 django.db.utils.OperationalError：无法连接到服务器：没有这样的文件或目录
服务器是否在本地运行，并在Unix域套接字/var/run/postgresql/.s.PGSQL.8081上接受
连接？ 
  

任何帮助将有助于提前
我正在ubantu os工作。 / p>

解决方案

此步骤对我有用
如果存在，请停用virtualenv。

1

  pyenv停用
  

1. 安装所需的库。

1

  sudo apt-get install libpq-dev python-dev 
  pre> 
 
 
 
 
安装PostgreSQL。
 
 
 1 
  sudo apt-get install postgresql postgresql-contrib 
  / pre> 
 
 
 
 
启动psql shell。
 
 
 1 
  sudo -u postgres psql 
  pre> 
 
 
 
 
通过输入以下命令设置postgres用户密码，并在psql中提示您输入密码贝壳。按Control + D退出。
 
 
 1 
  \password postgres 
  
 
 
 
 
 
创建一个名为django_user的新数据库用户。
 
 
 1`
  sudo -u postgres createuser django_user 
  
 
 
 
 
 
再次转到psql shell。
 
 
 1 
  sudo -u postgres psql 
  
 
 
 
 
 
创建数据库并将其命名为django_db。
 
 
 1 
  CREATE DATABASE django_db; 
  
 
 
 
 
 
设置django_user的密码。 > 
 
 1 
  ALTER USER django_user WITH PASSWORD '<密码>'; 
  
 
 
 
 
 
正确授予权限。 
 
 1 
 授予DATABASE上的所有优势django_db TO django_user; 
  
 
 
 
 
 
退出psql shell并激活virtualenv。 
 
 
 1 
  pyenv activate <&的virtualenv GT; 
  
 
 
 
 
 
安装psycopg2包
 
 
 1 
  pip install psycopg2 
  
 
 
 
 
 
 
按照以下步骤编辑Django项目settings.py 
 
 
 
 DATABASES = {
'default'：{
'ENGINE'：'django.db.backends.postgresql_psycopg2'，
 'NAME'：'django_db'，
'USER'：'django_user'，
'PASSWORD'：''，
'HOST'：'localhost'，
'PORT' ：'5432'，
} 
} 
 
 
 
 
初始化db。
 
 
 
 1 
  python manage.py migrate 
  
 
 
 
 
 
启动Django项目，看看是否一切正常。
 
 
 1 
  python manage.py runserver 0.0 .0.0：8000 
  
 D一=）
 
my setting of database in settings.py is below
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'dbname',
        'USER': 'postgres',
        'PASSWORD': 'postgres',
        'HOST': '',
        'PORT':'8081',
    }
}
but when running python manage.py migratei am getting error django.db.utils.OperationalError: could not connect to server: No such file or directory
Traceback (most recent call last):
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 130, in ensure_connection
    self.connect()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 119, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 176, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/psycopg2/__init__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
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.8081"?


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/base.py", line 444, in execute
    output = self.handle(*args, **options)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 93, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/executor.py", line 19, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/loader.py", line 47, in __init__
    self.build_graph()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/loader.py", line 182, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/recorder.py", line 59, in applied_migrations
    self.ensure_schema()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/migrations/recorder.py", line 49, in ensure_schema
    if self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor()):
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 162, in cursor
    cursor = self.make_debug_cursor(self._cursor())
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 135, in _cursor
    self.ensure_connection()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 130, in ensure_connection
    self.connect()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/utils.py", line 97, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/utils/six.py", line 658, in reraise
    raise value.with_traceback(tb)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 130, in ensure_connection
    self.connect()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/base/base.py", line 119, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 176, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/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: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.8081"?
any help will be helpful thanks in advanceI am working on a ubantu os.
 解决方案 
This steps worked for me Deactivate the virtualenv if there is.
1
pyenv deactivate
Install the required libraries.
1
sudo apt-get install libpq-dev python-dev
Install PostgreSQL.
1
sudo apt-get install postgresql postgresql-contrib
Start the psql shell.
1
sudo -u postgres psql
Setup the postgres user password by entering the following command and you will be prompted for password in the psql shell. Press Control + D to quit after it is done.
1
\password postgres
Create a new database user called django_user.
1 `
sudo -u postgres createuser django_user
Go to the psql shell again.
1
sudo -u postgres psql
Create the database and name it django_db.
1
CREATE DATABASE django_db;
Set the password for django_user.
1
ALTER USER django_user WITH PASSWORD '<password>';
Grant the privilege properly.
1
GRANT ALL PRIVILEGES ON DATABASE django_db TO django_user;
Exit the psql shell and activate the virtualenv.
1
pyenv activate <virtualenv>
Install the psycopg2 package.
1
pip install psycopg2
Edit the Django project settings.py as follow.
DATABASES = {    'default': {        'ENGINE': 'django.db.backends.postgresql_psycopg2',        'NAME': 'django_db',        'USER': 'django_user',        'PASSWORD': '',        'HOST': 'localhost',        'PORT': '5432',    }}
Initialize the db.
1
python manage.py migrate
Start the Django project and see if everything works fine.
1
python manage.py runserver 0.0.0.0:8000
Done =)
                        
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