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Unable to access MySQL database with Python connection…

Unable to access MySQL database with Python connection…



I'm relatively new to Google Cloud software, and despite my efforts to thoroughly read the documentation, I found myself unable to access my MySQL database on Google Cloud. I hope this information helps clarify my problem to provide context.

I'm tasked with creating access to a MySQL database on Google Cloud for my company's employees. You created an instance with a private IP and configured a service account with all required roles and permissions. I plan to use this to allow workers to access the database. Additionally, you configured your VPC network, connected your Cloud SQL instance to this VPC, and authorized your local IP to connect. At this time, we do not have any tunnels configured with Google Cloud VPN or your local network. The first question is: Do I need VPN IPsec on my local network to enable communication between my Cloud SQL instance and my local network?

You cannot configure VPN IPsec on your local network at this time. Assuming it was needed, I temporarily switched the Cloud SQL instance to public just long enough to establish a connection. I was hoping that this would simplify the process of connecting to the database. I set up some firewall rules that only allow communication from the local IP to the instance. I tried to connect to the database using the following Python script (excerpted from the documentation).


please import us

import sqlalchemy

import pymysql

import from google.authload_credentials_from_file import connector, from IPType

from dotenv import load_dotenv

def connect_with_connector() -> sqlalchemy.engine.base.Engine:


Initialize the connection pool for a Cloud SQL instance of MySQL.

Use the Cloud SQL Python connector package.


# Note: Although it would be convenient to store credentials in environment variables, this is not the case

# secure – Consider more secure solutions such as:

# See Cloud Secret Manager (

# Keep your secrets safe.


Instance connection name = os.getenv(“INSTANCE_CONNECTION_NAME”)

db_user = os.getenv(“DB_USER”)

db_pass = os.getenv(“DB_PASS”)

db_name = os.getenv(“DB_NAME”)

credential_path = os.getenv(“CREDENTIAL_PATH”)

credentials, _ = load credentials from file(credentials path)

# SSL file path

ssl_ca = os.getenv(“SSL_CA”) # path to server-ca.pem file

ssl_cert = os.getenv(“SSL_CERT”) # path to client-cert.pem file

ssl_key = os.getenv(“SSL_KEY”) # path to client-key.pem file

ssl_args = {

“SSL”: {

'as': ssl_as,

'Certificate': ssl_cert,

'key': ssl_key



# ip_type = IPTypes.PRIVATE if private_ip else IPTypes.PUBLIC

ip_type = IPTypes.PUBLIC

connector = connector(ip_type)

def getconn() -> pymysql.connections.Connection:

conn: pymysql.connections.Connection = connector.connect(

instance connection name,



db=database name,



return con

pool = sqlalchemy.create_engine(



pool_size=5, # Connection pool size

max_overflow=2, # Maximum number of additional connections allowed

pool_timeout=30, # Maximum time to wait before getting a connection

pool_recycle=1800, # Maximum connection lifetime (in seconds)


return pool

Since I intend to connect to a service account (for my final use case), I ran the following command to set the application default credentials (ADC).

gcloud auth application-default login –impersonate-service-account SERVICE_ACCT_EMAIL

gcloud config set auth/impersonate_service_account gcloud auth application-default login –impersonate-service-account SERVICE_ACCT_EMAIL

Now that we have the credentials file, set its path to the environment variable GOOGLE_APPLICATION_CREDENTIALS. You have successfully granted all required permissions to the service account. Below is a list of permissions.

Cloudaicompanion.entitlements.get Cloudsql.backupRuns.create Cloudsql.backupRuns.get Cloudsql.backupRuns.list Cloudsql.databases.create Cloudsql.databases.get Cloudsql.databases.list Cloudsql.databases.update Cloudsql.instances.addServerCa Cloudsql.instances.connect Cloudsql.instances.export Cloudsql.instances.failover Cloudsql.instances.get Cloudsql.instances.list compute.networks.get iam.serviceAccounts.actAs iam.serviceAccounts.get iam.serviceAccounts.getAccessToken iam.serviceAccounts.getOpenIdToken iam.serviceAccounts.implicitDelegation iam.serviceAccounts.list iam.serviceAccounts.signBlob iam.serviceAccounts.signJwt resourcemanager.projects.get

I'm aware that these permissions may be excessive for my needs, but I'll address that once I can connect to the database. Additionally, as mentioned above, we added firewall rules for the following items:

Allow inbound traffic to protocol and port 3306 from your local IP to your Cloud SQL instance and VPC IP. Allow outbound traffic from your VPC and Cloud SQL instance IPs to your local IP and explicitly specify that IP in the Destination field.

In fact, I learned these concepts as I was implementing them, and when I got a little desperate, I tried to connect using Google Cloud Proxy and other methods, which may have affected my configuration.

In conclusion, you receive the following error message:

sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1045, “Access is denied for user 'serviceaccountusername @'cloudsqlproxy~localIP' (with password: NO)”)

(Context for this error: URL has been removed by staff)

I'm trying to connect with a service account, so I'm not using a password. I have the credentials file. I triple-checked information such as db_user, db_name, instance_connection_name, and ssl_certificate (tried something that might not be necessary if you connect using the Python connector).

I'm having trouble identifying the cause of the error and the resulting solution. Is there something important that I might have overlooked? Or am I doing something wrong?

Thank you for your cooperation.




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