AWS MSK Kafka Cluster Terraform module

Terraform module which creates AWS MSK (Managed Streaming for Kafka) resources.

Usage

See examples directory for working examples to reference:

module "msk_kafka_cluster" {
  source = "terraform-aws-modules/msk-kafka-cluster/aws"

  name                   = local.name
  kafka_version          = "3.5.1"
  number_of_broker_nodes = 3
  enhanced_monitoring    = "PER_TOPIC_PER_PARTITION"

  broker_node_client_subnets = ["subnet-12345678", "subnet-024681012", "subnet-87654321"]
  broker_node_storage_info = {
    ebs_storage_info = { volume_size = 100 }
  }
  broker_node_instance_type   = "kafka.t3.small"
  broker_node_security_groups = ["sg-12345678"]

  encryption_in_transit_client_broker = "TLS"
  encryption_in_transit_in_cluster    = true

  configuration_name        = "example-configuration"
  configuration_description = "Example configuration"
  configuration_server_properties = {
    "auto.create.topics.enable" = true
    "delete.topic.enable"       = true
  }

  jmx_exporter_enabled    = true
  node_exporter_enabled   = true
  cloudwatch_logs_enabled = true
  s3_logs_enabled         = true
  s3_logs_bucket          = "aws-msk-kafka-cluster-logs"
  s3_logs_prefix          = local.name

  scaling_max_capacity = 512
  scaling_target_value = 80

  client_authentication = {
    sasl = { scram = true }
  }
  create_scram_secret_association = true
  scram_secret_association_secret_arn_list = [
    aws_secretsmanager_secret.one.arn,
    aws_secretsmanager_secret.two.arn,
  ]

  # AWS Glue Registry
  schema_registries = {
    team_a = {
      name        = "team_a"
      description = "Schema registry for Team A"
    }
    team_b = {
      name        = "team_b"
      description = "Schema registry for Team B"
    }
  }

  # AWS Glue Schemas
  schemas = {
    team_a_tweets = {
      schema_registry_name = "team_a"
      schema_name          = "tweets"
      description          = "Schema that contains all the tweets"
      compatibility        = "FORWARD"
      schema_definition    = "{\"type\": \"record\", \"name\": \"r1\", \"fields\": [ {\"name\": \"f1\", \"type\": \"int\"}, {\"name\": \"f2\", \"type\": \"string\"} ]}"
      tags                 = { Team = "Team A" }
    }
    team_b_records = {
      schema_registry_name = "team_b"
      schema_name          = "records"
      description          = "Schema that contains all the records"
      compatibility        = "FORWARD"
      team_b_records = {
        schema_registry_name = "team_b"
        schema_name          = "records"
        description          = "Schema that contains all the records"
        compatibility        = "FORWARD"
        schema_definition = jsonencode({
          type = "record"
          name = "r1"
          fields = [
            {
              name = "f1"
              type = "int"
            },
            {
              name = "f2"
              type = "string"
            },
            {
              name = "f3"
              type = "boolean"
            }
          ]
        })
        tags = { Team = "Team B" }
      }
    }
  }

  tags = {
    Terraform   = "true"
    Environment = "dev"
  }
}

Examples

Examples codified under the examples are intended to give users references for how to use the module(s) as well as testing/validating changes to the source code of the module. If contributing to the project, please be sure to make any appropriate updates to the relevant examples to allow maintainers to test your changes and to keep the examples up to date for users. Thank you!

• Basic
• Complete

Requirements

Name	Version
terraform	>= 1.0
aws	>= 5.21
random	>= 3.6

Providers

Name	Version
aws	>= 5.21
random	>= 3.6

Modules

No modules.

Resources

Name	Type
aws_appautoscaling_policy.this	resource
aws_appautoscaling_target.this	resource
aws_cloudwatch_log_group.this	resource
aws_glue_registry.this	resource
aws_glue_schema.this	resource
aws_msk_cluster.this	resource
aws_msk_cluster_policy.this	resource
aws_msk_configuration.this	resource
aws_msk_scram_secret_association.this	resource
aws_msk_vpc_connection.this	resource
aws_mskconnect_custom_plugin.this	resource
aws_mskconnect_worker_configuration.this	resource
random_id.this	resource
aws_iam_policy_document.this	data source

Inputs

Name	Description	Type	Default	Required
broker_node_az_distribution	The distribution of broker nodes across availability zones (documentation). Currently the only valid value is DEFAULT	string	null	no
broker_node_client_subnets	A list of subnets to connect to in client VPC (documentation)	list(string)	[]	no
broker_node_connectivity_info	Information about the cluster access configuration	any	{}	no
broker_node_instance_type	Specify the instance type to use for the kafka brokers. e.g. kafka.m5.large. (Pricing info)	string	null	no
broker_node_security_groups	A list of the security groups to associate with the elastic network interfaces to control who can communicate with the cluster	list(string)	[]	no
broker_node_storage_info	A block that contains information about storage volumes attached to MSK broker nodes	any	{}	no
client_authentication	Configuration block for specifying a client authentication	any	{}	no
cloudwatch_log_group_kms_key_id	The ARN of the KMS Key to use when encrypting log data	string	null	no
cloudwatch_log_group_name	Name of the Cloudwatch Log Group to deliver logs to	string	null	no
cloudwatch_log_group_retention_in_days	Specifies the number of days you want to retain log events in the log group	number	0	no
cloudwatch_logs_enabled	Indicates whether you want to enable or disable streaming broker logs to Cloudwatch Logs	bool	false	no
cluster_override_policy_documents	Override policy documents for cluster policy	list(string)	null	no
cluster_policy_statements	Map of policy statements for cluster policy	any	null	no
cluster_source_policy_documents	Source policy documents for cluster policy	list(string)	null	no
configuration_arn	ARN of an externally created configuration to use	string	null	no
configuration_description	Description of the configuration	string	null	no
configuration_name	Name of the configuration	string	null	no
configuration_revision	Revision of the externally created configuration to use	number	null	no
configuration_server_properties	Contents of the server.properties file. Supported properties are documented in the MSK Developer Guide	map(string)	{}	no
connect_custom_plugin_timeouts	Timeout configurations for the connect custom plugins	map(string)	{ "create": null }	no
connect_custom_plugins	Map of custom plugin configuration details (map of maps)	any	{}	no
connect_worker_config_description	A summary description of the worker configuration	string	null	no
connect_worker_config_name	The name of the worker configuration	string	null	no
connect_worker_config_properties_file_content	Contents of connect-distributed.properties file. The value can be either base64 encoded or in raw format	string	null	no
create	Determines whether cluster resources will be created	bool	true	no
create_cloudwatch_log_group	Determines whether to create a CloudWatch log group	bool	true	no
create_cluster_policy	Determines whether to create an MSK cluster policy	bool	false	no
create_configuration	Determines whether to create a configuration	bool	true	no
create_connect_worker_configuration	Determines whether to create connect worker configuration	bool	false	no
create_schema_registry	Determines whether to create a Glue schema registry for managing Avro schemas for the cluster	bool	true	no
create_scram_secret_association	Determines whether to create SASL/SCRAM secret association	bool	false	no
enable_storage_autoscaling	Determines whether autoscaling is enabled for storage	bool	true	no
encryption_at_rest_kms_key_arn	You may specify a KMS key short ID or ARN (it will always output an ARN) to use for encrypting your data at rest. If no key is specified, an AWS managed KMS ('aws/msk' managed service) key will be used for encrypting the data at rest	string	null	no
encryption_in_transit_client_broker	Encryption setting for data in transit between clients and brokers. Valid values: TLS, TLS_PLAINTEXT, and PLAINTEXT. Default value is TLS	string	null	no
encryption_in_transit_in_cluster	Whether data communication among broker nodes is encrypted. Default value: true	bool	null	no
enhanced_monitoring	Specify the desired enhanced MSK CloudWatch monitoring level. See Monitoring Amazon MSK with Amazon CloudWatch	string	null	no
firehose_delivery_stream	Name of the Kinesis Data Firehose delivery stream to deliver logs to	string	null	no
firehose_logs_enabled	Indicates whether you want to enable or disable streaming broker logs to Kinesis Data Firehose	bool	false	no
jmx_exporter_enabled	Indicates whether you want to enable or disable the JMX Exporter	bool	false	no
kafka_version	Specify the desired Kafka software version	string	null	no
name	Name of the MSK cluster	string	"msk"	no
node_exporter_enabled	Indicates whether you want to enable or disable the Node Exporter	bool	false	no
number_of_broker_nodes	The desired total number of broker nodes in the kafka cluster. It must be a multiple of the number of specified client subnets	number	null	no
s3_logs_bucket	Name of the S3 bucket to deliver logs to	string	null	no
s3_logs_enabled	Indicates whether you want to enable or disable streaming broker logs to S3	bool	false	no
s3_logs_prefix	Prefix to append to the folder name	string	null	no
scaling_max_capacity	Max storage capacity for Kafka broker autoscaling	number	250	no
scaling_role_arn	The ARN of the IAM role that allows Application AutoScaling to modify your scalable target on your behalf. This defaults to an IAM Service-Linked Role	string	null	no
scaling_target_value	The Kafka broker storage utilization at which scaling is initiated	number	70	no
schema_registries	A map of schema registries to be created	map(any)	{}	no
schemas	A map schemas to be created within the schema registry	map(any)	{}	no
scram_secret_association_secret_arn_list	List of AWS Secrets Manager secret ARNs to associate with SCRAM	list(string)	[]	no
storage_mode	Controls storage mode for supported storage tiers. Valid values are: LOCAL or TIERED	string	null	no
tags	A map of tags to assign to the resources created	map(string)	{}	no
timeouts	Create, update, and delete timeout configurations for the cluster	map(string)	{}	no
vpc_connections	Map of VPC Connections to create	any	{}	no

Outputs

Name	Description
appautoscaling_policy_arn	The ARN assigned by AWS to the scaling policy
appautoscaling_policy_name	The scaling policy's name
appautoscaling_policy_policy_type	The scaling policy's type
arn	Amazon Resource Name (ARN) of the MSK cluster
bootstrap_brokers	Comma separated list of one or more hostname:port pairs of kafka brokers suitable to bootstrap connectivity to the kafka cluster
bootstrap_brokers_plaintext	Comma separated list of one or more hostname:port pairs of kafka brokers suitable to bootstrap connectivity to the kafka cluster. Contains a value if encryption_in_transit_client_broker is set to PLAINTEXT or TLS_PLAINTEXT
bootstrap_brokers_sasl_iam	One or more DNS names (or IP addresses) and SASL IAM port pairs. This attribute will have a value if encryption_in_transit_client_broker is set to TLS_PLAINTEXT or TLS and client_authentication_sasl_iam is set to true
bootstrap_brokers_sasl_scram	One or more DNS names (or IP addresses) and SASL SCRAM port pairs. This attribute will have a value if encryption_in_transit_client_broker is set to TLS_PLAINTEXT or TLS and client_authentication_sasl_scram is set to true
bootstrap_brokers_tls	One or more DNS names (or IP addresses) and TLS port pairs. This attribute will have a value if encryption_in_transit_client_broker is set to TLS_PLAINTEXT or TLS
cluster_uuid	UUID of the MSK cluster, for use in IAM policies
configuration_arn	Amazon Resource Name (ARN) of the configuration
configuration_latest_revision	Latest revision of the configuration
connect_custom_plugins	A map of output attributes for the connect custom plugins created
connect_worker_configuration_arn	The Amazon Resource Name (ARN) of the worker configuration
connect_worker_configuration_latest_revision	An ID of the latest successfully created revision of the worker configuration
current_version	Current version of the MSK Cluster used for updates, e.g. K13V1IB3VIYZZH
log_group_arn	The Amazon Resource Name (ARN) specifying the log group
schema_registries	A map of output attributes for the schema registries created
schemas	A map of output attributes for the schemas created
scram_secret_association_id	Amazon Resource Name (ARN) of the MSK cluster
vpc_connections	A map of output attributes for the VPC connections created
zookeeper_connect_string	A comma separated list of one or more hostname:port pairs to use to connect to the Apache Zookeeper cluster. The returned values are sorted alphabetically
zookeeper_connect_string_tls	A comma separated list of one or more hostname:port pairs to use to connect to the Apache Zookeeper cluster via TLS. The returned values are sorted alphabetically

License

Apache-2.0 Licensed. See LICENSE.