如何使用来自SqlAchemy + pg8000的SSL连接到Postgresql？

Question

直到我在postgres上启用SSL之前，从SqlAlchemy通过pg8000连接到postgres都工作良好。

db = create_engine('postgresql+pg8000://user:pass@hostname/dbname', echo=True).connect()

现在似乎失败了：

File "/Library/Python/2.7/site-packages/pg8000/core.py", line 872, in __init__
raise InterfaceError("communication error", exc_info()[1])
sqlalchemy.exc.InterfaceError: (InterfaceError) ('communication error', error(61, 'Connection refused')) None None

Answer 1

接受的答案不再有效，至少对于这些版本：

Python                   3.9
pg8000                   1.19.5
SQLAlchemy               1.4.12

pg8000 文档描述了您必须执行的操作。使用

engine = create_engine('postgresql+pg8000://user:password@host/db', 
                       connect_args={'ssl_context': True})

它将ssl.create_default_context()的结果传递给连接创建者。如果需要自定义 SSL 上下文，请将其作为值传递，而不是True：

import ssl

ssl_context = ssl.SSLContext()
# Set attributes as required  ...

engine = create_engine('postgresql+pg8000://user:password@host/db', 
                       connect_args={'ssl_context': ssl_context})

Answer 2

可能您需要添加connect_args字典：

db = create_engine('postgresql+pg8000://user:pass@hostname/dbname', connect_args={'sslmode':'require'}, echo=True).connect()