Python+Djangoの勉強をしており、makemigrationsでモデルの変更の保存を行おうとしたのですが、エラーが発生をしました。

[初めての Django アプリの作成、パート
2](https://docs.djangoproject.com/en/3.2/intro/tutorial02/)を参考にして、モデルの変更の保存を実行するために`python
manage.py migrate`を実行したのですが、エラーが発生して保存できませんでした。

・エラー

```

    ec2-user:~/environment/mysite $ python manage.py migrate
    Traceback (most recent call last):
      File "/home/ec2-user/.local/lib/python3.7/site-packages/pymysql/connections.py", line 645, in connect
        (self.host, self.port), self.connect_timeout, **kwargs
      File "/usr/lib64/python3.7/socket.py", line 728, in create_connection
        raise err
      File "/usr/lib64/python3.7/socket.py", line 716, in create_connection
        sock.connect(sa)
    ConnectionRefusedError: [Errno 111] Connection refused
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
        self.connect()
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 194, in connect
        self.connection = self.get_new_connection(conn_params)
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 236, in get_new_connection
        return Database.connect(**conn_params)
      File "/home/ec2-user/.local/lib/python3.7/site-packages/pymysql/connections.py", line 358, in __init__
        self.connect()
      File "/home/ec2-user/.local/lib/python3.7/site-packages/pymysql/connections.py", line 711, in connect
        raise exc
    pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "manage.py", line 19, in <module>
        execute_from_command_line(sys.argv)
      File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
        utility.execute()
      File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 365, in execute
        self.fetch_command(subcommand).run_from_argv(self.argv)
      File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
        self.execute(*args, **cmd_options)
      File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 332, in execute
        self.check()
      File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 364, in check
        include_deployment_checks=include_deployment_checks,
      File "/usr/local/lib/python3.7/site-packages/django/core/management/commands/migrate.py", line 57, in _run_checks
        issues = run_checks(tags=[Tags.database])
      File "/usr/local/lib/python3.7/site-packages/django/core/checks/registry.py", line 73, in run_checks
        new_errors = check(app_configs=app_configs)
      File "/usr/local/lib/python3.7/site-packages/django/core/checks/database.py", line 10, in check_database_backends
        issues.extend(conn.validation.check(**kwargs))
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/validation.py", line 9, in check
        issues.extend(self._check_sql_mode(**kwargs))
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/validation.py", line 13, in _check_sql_mode
        with self.connection.cursor() as cursor:
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 255, in cursor
        return self._cursor()
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 232, in _cursor
        self.ensure_connection()
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
        self.connect()
      File "/usr/local/lib/python3.7/site-packages/django/db/utils.py", line 89, in __exit__
        raise dj_exc_value.with_traceback(traceback) from exc_value
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
        self.connect()
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 194, in connect
        self.connection = self.get_new_connection(conn_params)
      File "/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 236, in get_new_connection
        return Database.connect(**conn_params)
      File "/home/ec2-user/.local/lib/python3.7/site-packages/pymysql/connections.py", line 358, in __init__
        self.connect()
      File "/home/ec2-user/.local/lib/python3.7/site-packages/pymysql/connections.py", line 711, in connect
        raise exc
    django.db.utils.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")
    
```

データベースの設定(mysite/mysite/setting.py)

```

    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.mysql',
            'NAME': 'dbuser',
            'PASSWORD': 'dbuser',
            'HOST': 'localhost',
            'PORT': '3306',
            'OPTIONS': {
                'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
            },
        }
    }
    
```

データベース：mysql Ver 15.1 Distrib 10.2.38-MariaDB, for Linux (x86_64) using
EditLine wrapper

python: Python 3.7.16

Djamgo: 2.0.2
CC BY-SA 4.0
2023-06-29T04:57:48.970
95410
2023-06-30T02:18:42.553
2023-06-30T02:18:42.553
58130
58130
question
python django
makemigrationsが失敗した原因