Cloud SQL Access denied - mysql

Question

import webapp2
import MySQLdb
import os
class MainPage(webapp2.RequestHandler):
def get(self):
if (os.getenv('SERVER_SOFTWARE') and
os.getenv('SERVER_SOFTWARE').startswith('Google App Engine/')):
db = MySQLdb.connect(unix_socket='/cloudsql/fluent-outlet-604:test-db' , db='guestbook', user='root',passwd='root')
# connect to the cloud SQL
else:
db = MySQLdb.connect(host='173.194.248.221', port=3306, db='guestbook', user='root',passwd='root')
cursor = db.cursor()
cursor.execute('SELECT guestName, content, entryID FROM entries')
data = cursor.fetchall()
db.close()
self.response.write(data)
application = webapp2.WSGIApplication([
('/',MainPage),
],debug=True)
when i deploy this app to the app engine i gain error says
"(1045, "Access denied for user 'root'#'localhost' (using password: YES)")

Answer 1

I had the same problem, and solved it.
This problem is on Google Cloud SQL.
In the prompt console, re-start Cloud SQL like below,
gcloud sql instances --project [app engine project name] restart [sql instance name]

Answer 2

You should not specify the root password (even if you have set), when connecting from AppEngine.
Remove the passwd param from line 9 of your code so that it looks like:
db = MySQLdb.connect(unix_socket='/cloudsql/fluent-outlet-604:test-db' , db='guestbook', user='root')
The example code in this article also shows this.

Answer 3

I saw this problem when I didn't specify the hostname in the database URI:
SQLALCHEMY_DATABASE_URI = (
'mysql+pymysql://<user-name>:<password>#/<database-name>'
'?unix_socket=/cloudsql/<connection_name>'
Changing it to the following fixed it:
SQLALCHEMY_DATABASE_URI = (
'mysql+pymysql://<user-name>:<password>#<host-name>/<database-name>'
'?unix_socket=/cloudsql/{connection_name}'