将 Cloud Run 容器连接到 Cloud SQL

Question

更新：

我重新分叉了 GoogleCloudPlatform 示例项目并再次尝试。突然，它开始工作了。

我的问题有一半与我的目标项目使用 Flask-SQLAlchemy 这一事实有关。为此，我需要使用MySQLdb 方言，如以下答案所示： https://stackoverflow.com/a/10900826/4455571

我仍然不确定为什么我第一次无法让 GoogleCloudPlatform 示例工作，以及为什么在我重新分叉后它突然开始工作。

原帖：

我正在尝试使用以下指南将在 Cloud Run 上运行的容器连接到 Cloud SQL： https://cloud.google.com/sql/docs/mysql/connect-run?hl=en_US

我已确保执行以下操作：

• 为我的项目启用 API
• 将“Cloud SQL Client”角色添加到我的 服务帐户 REDACTED-compute@developer.gserviceaccount.com

但是，连接失败并出现以下错误：

文件“/usr/local/lib/python3.8/site-packages/pymysql/connections.py”, 第 630 行，在连接中引发 exc sqlalchemy.exc.OperationalError： (pymysql.err.OperationalError) (2003, "无法连接到 MySQL 服务器 在 'localhost' ([Errno 2] 没有这样的文件或目录)")

我使用来自 GitHub 的示例代码进行了第二次尝试： https://github.com/GoogleCloudPlatform/python-docs-samples/tree/master/cloud-sql/mysql/sqlalchemy

这些是我遵循的步骤：

1. 镜像存储库并将其设为私有
2. 编辑 app.yaml 以添加类似于以下内容的凭据（我没有将值括在引号中 - 应该吗？）：

env_variables:
  CLOUD_SQL_CONNECTION_NAME: my-project-270323:us-central1:database
  DB_USER: root
  DB_PASS: areallygreatpassword
  DB_NAME: database

1. 将存储库连接到 Cloud Build 并触发了新的构建
2. 在 Cloud Run 上的新服务中部署了我的容器，确保在 Connections > Cloud SQL 连接下按数据库选择

我得到同样的错误。我做错了什么？

编辑

这是完整的错误转储：

Traceback (most recent call last):()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2446, in wsgi_app response = self.full_dispatch_request()()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1944, in full_dispatch_request self.try_trigger_before_first_request_functions()()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1992, in try_trigger_before_first_request_functions func()()
File "/app/main.py", line 81, in create_tables with db.connect() as conn:()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 2209, in connect return self._connection_cls(self, **kwargs)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 103, in __init__ else engine.raw_connection()()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 2306, in raw_connection return self._wrap_pool_connect(()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 2279, in _wrap_pool_connect Connection._handle_dbapi_exception_noconnection(()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 1547, in _handle_dbapi_exception_noconnection util.raise_from_cause(sqlalchemy_exception, exc_info)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause reraise(type(exception), exception, tb=exc_tb, cause=cause)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 152, in reraise raise value.with_traceback(tb)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 2276, in _wrap_pool_connect return fn()()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 303, in unique_connection return _ConnectionFairy._checkout(self)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 773, in _checkout fairy = _ConnectionRecord.checkout(pool)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 492, in checkout rec = pool._do_get()()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 139, in _do_get self._dec_overflow()()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 68, in __exit__ compat.reraise(exc_type, exc_value, exc_tb)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 153, in reraise raise value()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 136, in _do_get return self._create_connection()()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 308, in _create_connection return _ConnectionRecord(self)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 437, in __init__ self.__connect(first_connect_check=True)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 652, in __connect connection = pool._invoke_creator(self)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/strategies.py", line 114, in connect return dialect.connect(*cargs, **cparams)()
File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 489, in connect return self.dbapi.connect(*cargs, **cparams)()
File "/usr/local/lib/python3.8/site-packages/pymysql/__init__.py", line 94, in Connect return Connection(*args, **kwargs)()
File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 325, in __init__ self.connect()()
File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 630, in connect raise exc sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on 'localhost' ([Errno 2] No such()
File or directory)")

另外，我是通过 Web 控制台而不是 CLI 执行此操作的。以下是我传递给 Google 提供的示例项目的设置：

drive.google.com/open?id=17nl_rQVTU2ZirCEu64bjfe90zGweg3a6 drive.google.com/open?id=1_Riy1HNSPvZZUGl4tJ0Z8puYuuMbUMPH

Answer 1

这个问题包括一些广泛的研究，做得很好。直接解决几点：

• app.yaml 文件特定于 App Engine，是一种将环境变量配置传递给您的应用程序的方法。在 Cloud Run 中，您在部署时使用 --update-env-vars flag。
• 您的服务部署操作中可能还缺少一个标志：--add-cloudsql-instances INSTANCE-CONNECTION-NAME

这些步骤一起：

gcloud run deploy SERVICE --image gcr.io/PROJECT/SERVICE \
  --add-cloudsql-instances my-project-270323:us-central1:database
  --update-env-vars CLOUD_SQL_CONNECTION_NAME=my-project-270323:us-central1:database \
  --update-env-vars DB_USER=root \
  --update-env-vars DB_PASS=areallygreatpassword \
  --update-env-vars DB_NAME=database

请注意，INSTANCE_CONNECTION_NAME 中的 database 是 Cloud SQL 实例，而作为 DB_NAME 的 database 是在该实例中创建的数据库。

配置值需要用作创建数据库连接的一部分。

您可以在complete sample code on Github中看到更多这些环境变量之间的连接和创建连接对象。