App Engine allows developers to focus on doing what they do best, writing
code. Based on Google Compute Engine, the App Engine flexible environment
automatically scales your app up and down while balancing the load.
Microservices, authorization, SQL and NoSQL databases, traffic splitting,
logging, versioning, security scanning, and content delivery networks are
all supported natively. In addition, the App Engine flexible environment
allows you to customize the runtime and even the operating system of your
virtual machine using Dockerfiles. You may find related information on the
"App Engine Flexible Environment" documentation page
<https://cloud.google.com/appengine/docs/flexible/>.
The "cloud_sql_instances: INSTANCE_CONNECTION_NAME" instruction from
app.yaml is meant for this Flexible managed environment. It is difficult to
view it as hard coding. In what concerns Django, this is your framework of
choice, and you are in a position to take the most advantageous decisions.
Instead of hard coding, you could, for instance, make use of the already
set environment variables:
env_variables:
# Replace user, password, database, and instance connection name with
the values obtained
# when configuring your Cloud SQL instance.
SQLALCHEMY_DATABASE_URI: >-
mysql+pymysql://USER:PASSWORD@/DATABASE?unix_socket=/cloudsql/INSTANCE_CONNECTION_NAME
#[END gae_flex_mysql_env]
This allows you to reference environment variables in your Python code. For
an example, you could follow the example on the "Using Cloud SQL for MySQL"
documentation page
<https://cloud.google.com/appengine/docs/flexible/python/using-cloud-sql>.
# Environment variables are defined in app.yaml.
app.config['SQLALCHEMY_DATABASE_URI'] =
os.environ['SQLALCHEMY_DATABASE_URI']
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
The above code excerpt illustrates how you may refer environment variables
in your Python code.
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