1. We assume you already read this: https://cloud.google.com/sql/docs/mysql/connect-external-app#proxy and created a service account for Cloud SQL Client
1. Download cloud_sql_proxy to `/usr/local/bin`
1. Make the following folders, all chown to `root:root` :
  1. `/var/run/cloud-sql-proxy`
  1. `/var/local/cloud-sql-proxy`
1. Copy downloaded credential json file inside `/var/local/cloud-sql-proxy`, make sure only root can read as it is credential for connection.
1. Copy above gist to `/lib/systemd/system/cloud-sql-proxy.service`
2. Run `systemctl daemon-reload`
3. Run `systemctl start cloud-sql-proxy`
4. Profit$$$$