How to securely connect to Cloud SQL from Cloud Run?

UPDATE: to connect to Cloud SQL from Cloud Run see the official documentation

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Cloud SQL is now supported by the fully managed version of Cloud Run (Cloud Run on GKE users were already able to use Cloud SQL using a private IP)

To get started:

• if you do not have one already, create a Cloud SQL instance.
• make sure that the Cloud SQL admin API is enabled
• deploy a new revision of your Cloud Run service with gcloud alpha and the following flag: $ gcloud run services update --add-cloudsql-instances [INSTANCE_CONNECTION_NAME] Where is INSTANCE_CONNECTION_NAME is of the type project:region:instancename.

When you do this, Cloud Run will activate and configure the Cloud SQL proxy for you. You should then connect to it via the /cloudsql/[INSTANCE_CONNECTION_NAME] Unix socket.

CONNECTING FROM CLOUD RUN (fully managed) TO CLOUD SQL USING UNIX DOMAIN SOCKETS (Java)

At this time Cloud Run (fully managed) does not support connecting to the Cloud SQL instance using TCP. Your code should not try to access the instance using an IP address such as 127.0.0.1 or 172.17.0.1. link

1.Install and initialize the Cloud SDK

2.Update components:

gcloud components update

3.Create a new project

gcloud projects create run-to-sql
gcloud config set project run-to-sql
gcloud projects describe run-to-sql

4.Enable billing

gcloud alpha billing projects link  run-to-sql --billing-account  XXXXXX-XXXXXX-XXXX

5.Set the compute project-info metadata:

gcloud compute project-info describe --project run-to-sql
gcloud compute project-info add-metadata --metadata google-compute-default-region=europe-west2,google-compute-default-zone=europe-west2-b

6.Enable the Cloud SQL Admin API:

 gcloud services enable sqladmin.googleapis.com

7.Create a Cloud SQL instance with public Ip

#Create the sql instance in the same region as App Engine Application
gcloud --project=run-to-sql beta sql instances create database-external --region=europe-west2
#Set the password for the "root@%" MySQL user:
gcloud sql users set-password root --host=% --instance database-external --password root 
#Create a user
gcloud sql users create user_name --host=% --instance=database-external  --password=user_password
#Create a database
gcloud sql databases create user_database --instance=database-external
gcloud sql databases list --instance=database-external
gcloud sql instances list

Cloud Run (fully managed) uses a service account to authorize your connections to Cloud SQL. This service account must have the correct IAM permissions to successfully connect. Unless otherwise configured, the default service account is in the format [email protected].

8.Ensure that the service account for your service has one of the following IAM roles:Cloud SQL Client (preferred)

gcloud iam service-accounts list
gcloud projects add-iam-policy-binding run-to-sql --member serviceAccount:[email protected]. --role roles/cloudsql.client

9.Clone the java-docs-repository

git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git
cd java-docs-samples/cloud-sql/mysql/servlet/
ls
#Dockerfile  pom.xml  README.md  src

10.Inspect the file that handle the connection to Cloud SQL

 cat src/main/java/com/example/cloudsql/ConnectionPoolContextListener.java

11.Containerizing the app and uploading it to Container Registry

gcloud builds submit --tag gcr.io/run-to-sql/run-mysql

12.Deploy the service to Cloud Run

gcloud run deploy run-mysql --image gcr.io/run-to-sql/run-mysql

13.Configure the service for use with Cloud Run

gcloud run services update run-mysql --add-cloudsql-instances run-to-sql:europe-west2:database-external --set-env-vars CLOUD_SQL_CONNECTION_NAME=run-to-sql:europe-west2:database-external  DB_USER=user_name,DB_PASS=user_password,DB_NAME=user_database

14.Test it

 curl -H "Authorization: Bearer $(gcloud auth print-identity-token)"   https://run-mysql-xxxxxxxx-xx.x.run.app

SUCCESS!