Settings

The Settings CRD is one of the most important CRDs in Operator v2. It enables all the necessary adjustments so that the Operator can adapt to your usage and environment.

Settings are encoded as string, but under the hood, each setting can be unmarshalled to a specific type.

While we have some basic types (string, number, bool ...), we also have some complex structures:

• Maps: maps are just one level dictionary with values as string. Repeat <key>=<value> pattern for each entry, while separating with comma.
• URIs: URIs are used each time we need to address an external resource (postgres, kafka ...). URIs are convenient to encode a lot of information in a simple, normalized format.

Available settings

Key	Type	Example	Description
aws.service-account	string		AWS Role
postgres.<module-name>.uri	URI		Postgres database configuration
elasticsearch.dsn	URI		Elasticsearch connection URI
temporal.dsn	URI		Temporal URI
temporal.tls.crt	string		Temporal certificate
temporal.tls.key	string		Temporal certificate key
broker.dsn	URI		Broker URI
opentelemetry.traces.dsn	URI		OpenTelemetry collector URI
clear-database	bool	true	Whether to remove databases on stack deletion
ledger.deployment-strategy	string	single	Ledger deployment type
ledger.logs.max-batch-size	Int	1024	Ledger logs batching max size
payments.encryption-key	string		Payments data encryption key
deployments.<deployment-name>.init-containers.<container-name>.resource-requirements	Map	cpu=X, mem=X
deployments.<deployment-name>.containers.<container-name>.resource-requirements	Map	cpu=X, mem=X
deployments.<deployment-name>.init-containers.<container-name>.run-as	Map	user=X, group=X
deployments.<deployment-name>.containers.<container-name>.run-as	Map	user=X, group=X
deployments.<deployment-name>.replicas	string	2
caddy.image	string		Caddy image
registries.<name>.endpoint	string		Specify a custom endpoint for a specific docker repository
registries.<name>.images.<path>.rewrite	string	formancehq/example	Allow to rewrite the image path
search.batching	Map	period=1s, count=10	Override default batching parameters
services.<service-name>.annotations	Map		Allow to specify custom annotations to apply on created k8s services
gateway.ingress.annotations	Map		Allow to specify custom annotations to apply on the gateway ingress
logging.json	bool		Configure services to log as json
modules.<module-name>.database.connection-pool	Map	max-idle=10, max-idle-time=10, max-open=10	Configure database connection pool for each module. See Golang documentation

Postgres URI format

Scheme: postgresql

Query params :

Name	Type	Default	Description
secret	string		Specify a secret where credentials are defined
disableSSLMode	bool	false	Disable SSL on Postgres connection

ElasticSearch URI format

Scheme: elasticsearch

Query params :

Name	Type	Default	Description
secret	string		Specify a secret where credentials are defined

Temporal URI format

Scheme : temporal

Path : Match the temporal namespace

Query params :

Name	Type	Default	Description
secret	string		Specify a secret where temporal certificates are defined

Broker URI format

Scheme : nats | kafka

Broker URI format (nats)

Scheme: nats

Query params :

Name	Type	Default	Description
replicas	number	1	Specify the number of replicas to configure on newly created nats streams

Broker URI format (kafka)

Scheme: kafka

Query params :

Name	Type	Default	Description
saslEnabled	bool	false	Specify is sasl authentication must be enabled
saslUsername	string		Username on sasl authentication
saslPassword	string		Password on sasl authentication
saslMechanism	string		Mechanism on sasl authentication
saslSCRAMSHASize	string		SCRAM SHA size on sasl authentication
tls	bool	false	Whether enable ssl or not

The process is always the same: you create a YAML file, submit it to Kubernetes, and the Operator takes care of the rest. All the values present in the Metadata section are not used by the Operator. Conversely, the Spec section is used to define the Operator's parameters. You will always find 3 parameters there:

• stacks: defines the stacks that should use this configuration (you can put a * to indicate that all stacks should use this configuration)
• key: defines the key of the configuration (you can put a * so that it applies to all services)
• value: defines the value of the configuration

Examples

Define PostgreSQL clusters

In this example, you will set up a configuration for a PostgreSQL cluster that will be used only by the formance-dev stack but will apply to all the modules of this stack. Thus, the different modules of the Stack will use this PostgreSQL cluster while being isolated in their own database.

info

This database is created following the format: {stackName}-{module}

apiVersion: formance.com/v1beta1
kind: Settings
metadata:
  name: formance-dev-postgres-uri
spec:
  key: postgres.*.uri
  stacks:
    - 'formance-dev'
  value: postgresql://formance:formance@postgresql.formance-system.svc:5432?disableSSLMode=true

Use AWS IAM Role

In this example, you'll use an AWS IAM role to connect to the database. The formance-dev stack will use this configuration.

apiVersion: v1
kind: ServiceAccount
metadata:
  name: aws-rds-access-role
  namespace: formance-system
  labels:
    formance.com/stack: any
  annotations:
    eks.amazonaws.com/role-arn: arn:aws:iam::AWS_ACCOUNT_ID:role/AWS_ROLE_NAME
---
apiVersion: formance.com/v1beta1
kind: Settings
metadata:
  name: formance-dev-postgres-uri
spec:
  key: postgres.*.uri
  stacks:
    - 'formance-dev'
  value: postgresql://formance@postgresql.formance-system.svc:5432

Define module resource requests

In this example, you'll set up a configuration for the resource requests of the formance-dev stack. This configuration will apply to all the modules of this stack.

apiVersion: formance.com/v1beta1
kind: Settings
metadata:
  name: formance-dev-resource-requests
spec:
  key: deployments.*.containers.*.resource-requirements.requests
  stacks:
    - 'formance-dev'
  value: cpu=10m,memory=100Mi

Define a Broker

In this example, you'll set up a configuration for the Broker of the formance-dev stack. This configuration will apply to all the modules of this stack.

apiVersion: formance.com/v1beta1
kind: Settings
metadata:
  name: formance-dev-broker
spec:
  key: broker.dsn
  stacks:
    - 'formance-dev'
  value: nats://nats.formance-system.svc:4222?replicas=3

Define a OpenTelemetry Collector

In this example, you'll set up a configuration to send traces and metrics to an OpenTelemetry collector. This configuration will apply to all modules in this stack.

apiVersion: formance.com/v1beta1
kind: Settings
metadata:
  name: stacks-otel-collector
spec:
  key: opentelemetry.*.dsn
  stacks:
    - "formance-dev"
  value: grpc://opentelemetry-collector.formance-system.svc:4317?insecure=true