【Djangoエラー】could not connect to server: Connection refused

エラー

PostgreSQLに接続できていない。

psycopg2.OperationalError: could not connect to server: Connection refused
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 5432?
could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?

解決策

設定を修正

settings.pyのDATABASESに「'PORT': '5432',」記載

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'DBの名前',
        'USER': 'ユーザー名',
        'PASSWORD': 'パスワード',
        'HOST': 'localhost',
        'PORT': '5432',
    }
}

もしくは

PostgreSQLに接続を行う

$ postgres -D /usr/local/var/postgres