Connect cloud instance locally for laravel project running as service - google-app-engine

Question

I am trying to connect a Laravel to Google mysql instance locally.
.env file
APP_NAME=Laravel
APP_ENV=local
APP_KEY=base64:GptV9AIxUX7TuPkKxbLs54DLjivt2wCmuG37qsnqxJU=
APP_DEBUG=true
APP_URL=http://localhost
LOG_CHANNEL=stack
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=**********
DB_USERNAME=**********
DB_PASSWORD=**********
DB_SOCKET=/cloudsql/[INSTANCE NAME]
BROADCAST_DRIVER=log
CACHE_DRIVER=file
SESSION_DRIVER=file
SESSION_LIFETIME=120
QUEUE_DRIVER=sync
REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379
MAIL_DRIVER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null
PUSHER_APP_ID=
PUSHER_APP_KEY=
PUSHER_APP_SECRET=
PUSHER_APP_CLUSTER=mt1
MIX_PUSHER_APP_KEY="${PUSHER_APP_KEY}"
MIX_PUSHER_APP_CLUSTER="${PUSHER_APP_CLUSTER}"
I am using this cloud_sql_proxy command:
~/Downloads/cloud_sql_proxy -instances=/cloudsql/[INSTANCE_ID]=tcp:3306
and it working properly,
2018/07/18 13:46:29 Listening on 127.0.0.1:3306 for /cloudsql/[INSTANCE ID]
2018/07/18 13:46:29 Ready for new connections
I also enabled enabled Google Cloud SQL and Cloud SQL Admin API for my project.
The error I receive is:
SQLSTATE[HY000] [2002] No such file or directory (SQL: select * from `campaigns`)
Below are my observation in struggle to find a solution.
In Stackdriver logging error that I see is
severity: "ERROR"
textPayload: "2018-07-18T05:57:08.204597Z 859643 [Note] Aborted connection 859643 to db: '[DB_NAME]' user: '[DB_USER]' host: 'cloudsqlproxy~173.194.90.33' (Got an error reading communication packets)"
When I check ~/Downloads/cloud_sql_proxy info:
2018/07/18 14:10:50 Using gcloud's active project: [PROJECT ID]
2018/07/18 14:10:55 must set -dir: using a unix socket for [INSTANCE NAME]
I am actually not able to relate if this is related to error.
I have tried connecting cloud sql using service account, its connects properly but still not able to resolve this issue.
Thanks in advance.

Answer 1

There are two ways to connect to Cloud SQL: via TCP or via a Unix Socket.
If you are using a Unix Socket, you need to specify -dir /cloudsql (or similar) as a directory to create your socket in. Full command looks something like this:
./cloud_sql_proxy -dir=/cloudsql -instances=myProject:uscentral1:myInstance
You would then use DB_SOCKET=/cloudsql/myProject:uscentral1:myInstance to connect. (You don't need a host or port - you're connecting via the unix socket)
If you are using TCP, you apply the port you want to listen to your instance name. So the command looks like this:
./cloud_sql_proxy -instances=myProject:us-central1:myInstance=tcp:3306
In this case, you use DB_HOST=127.0.0.1 and DB_PORT=3306 (but not DB_SOCKET).