Google Cloud Build keeps on giving me 'Can't reach database server at' - database-migration

Question

So I have been at this for days now almost and it is driving me crazy. Based on other posts, I have set up the following cloudbuild.yaml :
steps:
- name: gcr.io/cloud-builders/docker
args:
- build
- -t
- gcr.io/${INSTANCE_NAME}
- .
- name: gcr.io/cloud-builders/docker
args:
- push
- gcr.io/${INSTANCE_NAME}
- name: 'gcr.io/${INSTANCE_NAME}'
entrypoint: sh
env:
- DATABASE_URL=postgresql://USER:PASSWORD#localhost/DATABASE?host=/cloudsql/CONNECTION_NAME
args:
- -c
- |
wget https://dl.google.com/cloudsql/cloud_sql_proxy.linux.amd64 -O cloud_sql_proxy
chmod +x cloud_sql_proxy
./cloud_sql_proxy -instances=CONNECTION_NAME=tcp:5432 & sleep 3
npx prisma migrate deploy
- name: gcr.io/google.com/cloudsdktool/cloud-sdk
entrypoint: gcloud
args:
- run
- deploy
- backend
- --image
- gcr.io/${INSTANCE_NAME}
- --region
- europe-west1
images:
- gcr.io/${INSTANCE_NAME}
When running this, I am greeted by:
Step #2: 2023/02/05 13:00:49 Listening on 127.0.0.1:5432 for CONNECTION_NAME
Step #2: 2023/02/05 13:00:49 Ready for new connections
Step #2: 2023/02/05 13:00:49 Generated RSA key in 118.117245ms
Step #2: npm WARN exec The following package was not found and will be installed: prisma#4.9.0
Step #2: Prisma schema loaded from prisma/schema.prisma
Step #2: Datasource "db": PostgreSQL database "develop", schema "public" at "localhost"
Step #2:
Step #2: Error: P1001: Can't reach database server at `/cloudsql/CONNECTION_NAME`:`5432`
Step #2:
Step #2: Please make sure your database server is running at `/cloudsql/CONNECTION_NAME`:`5432`.
So even with using the database url hardcoded and with the Cloud SQL proxy working, i am STILL getting this error. What am I missing?

Answer 1

Check for the container-name in .env file and change it to postgres as it would replace name in connection string as discussed here
Or try the following format if you don’t want to hardcode IP address
DB_USER=dbuser
DB_PASS=dbpass
DB_HOST=localhost
DB_PORT=5432
CLOUD_SQL_CONNECTION_NAME=/cloudsql/gcp-project-id:europe-west3:db-instance-name
DATABASE_URL=postgres://${DB_USER}:${DB_PASS}#${DB_HOST}:${DB_PORT}/${DB_BASE}?host=${CLOUD_SQL_CONNECTION_NAME}
If you have public IP try connecting by unix socket