GCP Deployment Manager "ResourceErrorCode":"400" while database user creation - google-cloud-platform

Question

I am experimenting with deployment manager and each time I try to deploy an SQL instance with a DB on it and 2 users; some of the tasks are failing. Most of the time they are the users:
conf.yaml:
resources:
- name: mycloudsql
type: gcp-types/sqladmin-v1beta4:instances
properties:
name: mycloudsql-01
backendType: SECOND_GEN
instanceType: CLOUD_SQL_INSTANCE
databaseVersion: MYSQL_5_7
region: europe-west6
settings:
tier: db-f1-micro
locationPreference:
zone: europe-west6-a
activationPolicy: ALWAYS
dataDiskSizeGb: 10
- name: mydjangodb
type: gcp-types/sqladmin-v1beta4:databases
properties:
name: django-db-01
instance: $(ref.mycloudsql.name)
charset: utf8
- name: sqlroot
type: gcp-types/sqladmin-v1beta4:users
properties:
name: root
host: "%"
instance: $(ref.mycloudsql.name)
password: root
- name: sqluser
type: gcp-types/sqladmin-v1beta4:users
properties:
name: user
instance: $(ref.mycloudsql.name)
password: user
Error:
PS C:\Users\user\Desktop\Python\GCP> gcloud --project=sound-catalyst-263911 deployment-manager deployments create dm-sql-test-11 --config conf.yaml
The fingerprint of the deployment is TZ_wYom9Q64Hno6X0bpv9g==
Waiting for create [operation-1589869946223-5a5fa71623bc9-1912fcb9-bc59aafc]...failed.
ERROR: (gcloud.deployment-manager.deployments.create) Error in Operation [operation-1589869946223-5a5fa71623bc9-1912fcb9-bc59aafc]: errors:
- code: RESOURCE_ERROR
location: /deployments/dm-sql-test-11/resources/sqluser
message: '{"ResourceType":"gcp-types/sqladmin-v1beta4:users","ResourceErrorCode":"400","ResourceErrorMessage":{"code":400,"message":"Precondition
check failed.","status":"FAILED_PRECONDITION","statusMessage":"Bad Request","requestPath":"https://www.googleapis.com/sql/v1beta4/projects/sound-catalyst-263911/instances/mycloudsql-01/users","httpMethod":"POST"}}'
- code: RESOURCE_ERROR
location: /deployments/dm-sql-test-11/resources/sqlroot
message: '{"ResourceType":"gcp-types/sqladmin-v1beta4:users","ResourceErrorCode":"400","ResourceErrorMessage":{"code":400,"message":"Precondition
check failed.","status":"FAILED_PRECONDITION","statusMessage":"Bad Request","requestPath":"https://www.googleapis.com/sql/v1beta4/projects/sound-catalyst-263911/instances/mycloudsql-01/users","httpMethod":"POST"}}'
Console View:
It doesn`t say what that precondition failing is or am I missing something?

Answer 1

It seems the installation of database is not completed by the time the Deployment Manager starts to create users despite the reference notation is used in the YAML code to take care of dependencies. That is why you receive the "FAILED_PRECONDITION" error.
As a workaround you can split the deployment into two parts:
Create a CloudSQL instance and a database;
Create users.
This does not look elegant, but it works.
Alternatively, you can consider using Terraform. Fortunately, Cloud Shell instance is provided with Terraform pre-installed. There are sample Terraform code for Cloud SQL out there, for example this one:
CloudSQL deployment with Terraform