nats.md

title	Managed NATS Service
linkTitle	NATS
weight	50
aliases	/docs/reference/applications/nats /docs/v1.3/reference/applications/nats

NATS is an open-source, simple, secure, and high performance messaging system. It provides a data layer for cloud native applications, IoT messaging, and microservices architectures.

Parameters

Common parameters

Name	Description	Type	Value
replicas	Number of replicas.	int	2
resources	Explicit CPU and memory configuration for each NATS replica. When omitted, the preset defined in resourcesPreset is applied.	object	{}
resources.cpu	CPU available to each replica.	quantity	""
resources.memory	Memory (RAM) available to each replica.	quantity	""
resourcesPreset	Default sizing preset used when resources is omitted.	string	nano
storageClass	StorageClass used to store the data.	string	""
external	Enable external access from outside the cluster.	bool	false

Application-specific parameters

Name	Description	Type	Value
users	Users configuration map.	map[string]object	{}
users[name].password	Password for the user.	string	""
jetstream	Jetstream configuration.	object	{}
jetstream.enabled	Enable or disable Jetstream for persistent messaging in NATS.	bool	true
jetstream.size	Jetstream persistent storage size.	quantity	10Gi
config	NATS configuration.	object	{}
config.merge	Additional configuration to merge into NATS config.	*object	{}
config.resolver	Additional resolver configuration to merge into NATS config.	*object	{}

Parameter examples and reference

resources and resourcesPreset

resources sets explicit CPU and memory configurations for each replica. When left empty, the preset defined in resourcesPreset is applied.

resources:
  cpu: 4000m
  memory: 4Gi

resourcesPreset sets named CPU and memory configurations for each replica. This setting is ignored if the corresponding resources value is set.

Preset name	CPU	memory
nano	250m	128Mi
micro	500m	256Mi
small	1	512Mi
medium	1	1Gi
large	2	2Gi
xlarge	4	4Gi
2xlarge	8	8Gi