Question

我正在编写使用Vagrant和Ansbile（https://github.com/nickhs/flask_skeleton）部署Flask应用程序的指南，但仍然遇到一个我不知道如何解决的错误。

我运行以下内容...... $ vagrant up db

...在出现错误之前经过了几个步骤，我找不到任何答案。

这些步骤已经完成......

[db]正在运行的供应商：ansible ...

PLAY [dbservers] ************************************************************** 

GATHERING FACTS *************************************************************** 

TASK: [update apt] ************************************************************ 
changed: [192.168.100.20]

TASK: [install base packages] ************************************************* 
changed: [192.168.100.20] => (item=libpq-dev,python-dev,python-setuptools,git,libevent-dev,python-psycopg2)

TASK: [install pip] *********************************************************** 
changed: [192.168.100.20]

TASK: [add env variables] ***************************************************** 
changed: [192.168.100.20]

TASK: [install db server packages] ******************************************** 
changed: [192.168.100.20] => (item=postgresql,postgresql-contrib)

TASK: [update postgres db configuration] ************************************** 
changed: [192.168.100.20]

TASK: [update postgres client configuration] ********************************** 
changed: [192.168.100.20]

TASK: [link /vagrant to /srv/flask_skeleton] ********************************** 
changed: [192.168.100.20]

TASK: [install dependencies] ************************************************** 
changed: [192.168.100.20]

NOTIFIED: [source env variables] ********************************************** 
ok: [192.168.100.20]

NOTIFIED: [restart postgresql] ************************************************ 

PLAY [dbservers] ************************************************************** 
TASK: [create database user] ************************************************** 
TASK: [create database] ******************************************************* 

NOTIFIED: [build database] **************************************************** 
failed: [192.168.100.20] => {"item": "", "rc": 1}
stdout: Traceback (most recent call last):
  File "/srv/flask_skeleton/createdb.py", line 1, in <module>
    from app import db
ImportError: cannot import name db


PLAY RECAP ******************************************************************** 
           to retry, use: --limit @/var/tmp/ansible/vagrant-dbserver.retry

192.168.100.20             : ok=14   changed=12   unreachable=0    failed=1

有人能指出我正确的方向吗？

Answer 1

查看app.py中的行：

app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('DATABASE_URL')

if app.config['SQLALCHEMY_DATABASE_URI']:
    db = SQLAlchemy(app)

如果没有定义DATABASE_URL，则不会创建“db”变量，然后无法在createdb.py模块中导入该变量。你能检查一下你是否确实拥有os.environ.get（'DATABASE_URL'）的值？

尝试创建python Web应用程序时Vagrant的错误

1 个答案: