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Terraform module to provision Amazon Managed Streaming for Apache Kafka

Note: this module is intended for use with an existing VPC. To create a new VPC, use terraform-aws-vpc module.

NOTE: Release 0.8.0 contains breaking changes that will result in the destruction of your existing MSK cluster. To preserve the original cluster, follow the instructions in the 0.7.x to 0.8.x+ migration path.

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Usage

Here's how to invoke this example module in your projects

module "kafka" {
  source = "cloudposse/msk-apache-kafka-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  kafka_version        = "3.3.2"
  namespace            = "eg"
  stage                = "prod"
  name                 = "app"
  vpc_id               = "vpc-XXXXXXXX"
  subnet_ids           = ["subnet-XXXXXXXXX", "subnet-YYYYYYYY"]
  broker_per_zone      = 2
  broker_instance_type = "kafka.m5.large"

  # A list of IDs of Security Groups to associate the created resource with, in addition to the created security group
  associated_security_group_ids = ["sg-XXXXXXXXX", "sg-YYYYYYYY"]
  
  # A list of IDs of Security Groups to allow access to the cluster
  allowed_security_group_ids = ["sg-XXXXXXXXX", "sg-YYYYYYYY"]
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Examples

Here is an example of using this module:

examples/complete - complete example of using this module

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name	Version
terraform	>= 1.0.0
aws	>= 4.0

Providers

Name	Version
aws	>= 4.0

Modules

Name	Source	Version
hostname	cloudposse/route53-cluster-hostname/aws	0.13.0
security_group	cloudposse/security-group/aws	2.2.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_appautoscaling_policy.default	resource
aws_appautoscaling_target.default	resource
aws_msk_cluster.default	resource
aws_msk_configuration.config	resource
aws_msk_scram_secret_association.default	resource
aws_msk_broker_nodes.default	data source

Inputs

Name	Description	Type	Default	Required
additional_security_group_rules	A list of Security Group rule objects to add to the created security group, in addition to the ones this module normally creates. (To suppress the module's rules, set `create_security_group` to false and supply your own security group(s) via `associated_security_group_ids`.) The keys and values of the objects are fully compatible with the `aws_security_group_rule` resource, except for `security_group_id` which will be ignored, and the optional "key" which, if provided, must be unique and known at "plan" time. For more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule and https://github.com/cloudposse/terraform-aws-security-group.	`list(any)`	`[]`	no
additional_tag_map	Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	`map(string)`	`{}`	no
allow_all_egress	If `true`, the created security group will allow egress on all ports and protocols to all IP addresses. If this is false and no egress rules are otherwise specified, then no egress will be allowed.	`bool`	`true`	no
allowed_cidr_blocks	A list of IPv4 CIDRs to allow access to the security group created by this module. The length of this list must be known at "plan" time.	`list(string)`	`[]`	no
allowed_security_group_ids	A list of IDs of Security Groups to allow access to the security group created by this module. The length of this list must be known at "plan" time.	`list(string)`	`[]`	no
associated_security_group_ids	A list of IDs of Security Groups to associate the created resource with, in addition to the created security group. These security groups will not be modified and, if `create_security_group` is `false`, must have rules providing the desired access.	`list(string)`	`[]`	no
attributes	ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the `delimiter` and treated as a single ID element.	`list(string)`	`[]`	no
autoscaling_enabled	To automatically expand your cluster's storage in response to increased usage, you can enable this. More info	`bool`	`true`	no
broker_dns_records_count	This variable specifies how many DNS records to create for the broker endpoints in the DNS zone provided in the `zone_id` variable. This corresponds to the total number of broker endpoints created by the module. Calculate this number by multiplying the `broker_per_zone` variable by the subnet count. This variable is necessary to prevent the Terraform error: The "count" value depends on resource attributes that cannot be determined until apply, so Terraform cannot predict how many instances will be created.	`number`	`0`	no
broker_instance_type	The instance type to use for the Kafka brokers	`string`	n/a	yes
broker_per_zone	Number of Kafka brokers per zone	`number`	`1`	no
broker_volume_size	The size in GiB of the EBS volume for the data drive on each broker node	`number`	`1000`	no
certificate_authority_arns	List of ACM Certificate Authority Amazon Resource Names (ARNs) to be used for TLS client authentication	`list(string)`	`[]`	no
client_allow_unauthenticated	Enable unauthenticated access	`bool`	`false`	no
client_broker	Encryption setting for data in transit between clients and brokers. Valid values: `TLS`, `TLS_PLAINTEXT`, and `PLAINTEXT`	`string`	`"TLS"`	no
client_sasl_iam_enabled	Enable client authentication via IAM policies. Cannot be set to `true` at the same time as `client_tls_auth_enabled`	`bool`	`false`	no
client_sasl_scram_enabled	Enable SCRAM client authentication via AWS Secrets Manager. Cannot be set to `true` at the same time as `client_tls_auth_enabled`	`bool`	`false`	no
client_sasl_scram_secret_association_arns	List of AWS Secrets Manager secret ARNs for SCRAM authentication	`list(string)`	`[]`	no
client_sasl_scram_secret_association_enabled	Enable the list of AWS Secrets Manager secret ARNs for SCRAM authentication	`bool`	`true`	no
client_tls_auth_enabled	Set `true` to enable the Client TLS Authentication	`bool`	`false`	no
cloudwatch_logs_enabled	Indicates whether you want to enable or disable streaming broker logs to Cloudwatch Logs	`bool`	`false`	no
cloudwatch_logs_log_group	Name of the Cloudwatch Log Group to deliver logs to	`string`	`null`	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as `null` to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	`any`	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
create_security_group	Set `true` to create and configure a new security group. If false, `associated_security_group_ids` must be provided.	`bool`	`true`	no
custom_broker_dns_name	Custom Route53 DNS hostname for MSK brokers. Use `%%ID%%` key to specify brokers index in the hostname. Example: `kafka-broker%%ID%%.example.com`	`string`	`null`	no
delimiter	Delimiter to be used between ID elements. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
descriptor_formats	Describe additional descriptors to be output in the `descriptors` output map. Map of maps. Keys are names of descriptors. Values are maps of the form `{<br> format = string<br> labels = list(string)<br>}` (Type is `any` so the map values can later be enhanced to provide additional options.) `format` is a Terraform format string to be passed to the `format()` function. `labels` is a list of labels, in order, to pass to `format()` function. Label values will be normalized before being passed to `format()` so they will be identical to how they appear in `id`. Default is `{}` (`descriptors` output will be empty).	`any`	`{}`	no
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	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	`string`	`""`	no
encryption_in_cluster	Whether data communication among broker nodes is encrypted	`bool`	`true`	no
enhanced_monitoring	Specify the desired enhanced MSK CloudWatch monitoring level. Valid values: `DEFAULT`, `PER_BROKER`, and `PER_TOPIC_PER_BROKER`	`string`	`"DEFAULT"`	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
firehose_delivery_stream	Name of the Kinesis Data Firehose delivery stream to deliver logs to	`string`	`""`	no
firehose_logs_enabled	Indicates whether you want to enable or disable streaming broker logs to Kinesis Data Firehose	`bool`	`false`	no
id_length_limit	Limit `id` to this many characters (minimum 6). Set to `0` for unlimited length. Set to `null` for keep the existing setting, which defaults to `0`. Does not affect `id_full`.	`number`	`null`	no
inline_rules_enabled	NOT RECOMMENDED. Create rules "inline" instead of as separate `aws_security_group_rule` resources. See #20046 for one of several issues with inline rules. See this post for details on the difference between inline rules and rule resources.	`bool`	`false`	no
jmx_exporter_enabled	Set `true` to enable the JMX Exporter	`bool`	`false`	no
kafka_version	The desired Kafka software version. Refer to https://docs.aws.amazon.com/msk/latest/developerguide/supported-kafka-versions.html for more details	`string`	n/a	yes
label_key_case	Controls the letter case of the `tags` keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper`. Default value: `title`.	`string`	`null`	no
label_order	The order in which the labels (ID elements) appear in the `id`. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	`list(string)`	`null`	no
label_value_case	Controls the letter case of ID elements (labels) as included in `id`, set as tag values, and output by this module individually. Does not affect values of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper` and `none` (no transformation). Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs. Default value: `lower`.	`string`	`null`	no
labels_as_tags	Set of labels (ID elements) to include as tags in the `tags` output. Default is to include all labels. Tags with empty values will not be included in the `tags` output. Set to `[]` to suppress all generated tags. Notes: The value of the `name` tag, if included, will be the `id`, not the `name`. Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be changed in later chained modules. Attempts to change it will be silently ignored.	`set(string)`	[ "default" ]	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a `tag`. The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input.	`string`	`null`	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	`string`	`null`	no
node_exporter_enabled	Set `true` to enable the Node Exporter	`bool`	`false`	no
preserve_security_group_id	When `false` and `security_group_create_before_destroy` is `true`, changes to security group rules cause a new security group to be created with the new rules, and the existing security group is then replaced with the new one, eliminating any service interruption. When `true` or when changing the value (from `false` to `true` or from `true` to `false`), existing security group rules will be deleted before new ones are created, resulting in a service interruption, but preserving the security group itself. NOTE: Setting this to `true` does not guarantee the security group will never be replaced, it only keeps changes to the security group rules from triggering a replacement. See the terraform-aws-security-group README for further discussion.	`bool`	`false`	no
properties	Contents of the server.properties file. Supported properties are documented in the MSK Developer Guide	`map(string)`	`{}`	no
public_access_enabled	Enable public access to MSK cluster (given that all of the requirements are met)	`bool`	`false`	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits.	`string`	`null`	no
s3_logs_bucket	Name of the S3 bucket to deliver logs to	`string`	`""`	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 S3 folder name logs are delivered to	`string`	`""`	no
security_group_create_before_destroy	Set `true` to enable terraform `create_before_destroy` behavior on the created security group. We only recommend setting this `false` if you are importing an existing security group that you do not want replaced and therefore need full control over its name. Note that changing this value will always cause the security group to be replaced.	`bool`	`true`	no
security_group_create_timeout	How long to wait for the security group to be created.	`string`	`"10m"`	no
security_group_delete_timeout	How long to retry on `DependencyViolation` errors during security group deletion from lingering ENIs left by certain AWS services such as Elastic Load Balancing.	`string`	`"15m"`	no
security_group_description	The description to assign to the created Security Group. Warning: Changing the description causes the security group to be replaced.	`string`	`"Managed by Terraform"`	no
security_group_name	The name to assign to the created security group. Must be unique within the VPC. If not provided, will be derived from the `null-label.context` passed in. If `create_before_destroy` is true, will be used as a name prefix.	`list(string)`	`[]`	no
security_group_rule_description	The description to place on each security group rule. The %s will be replaced with the protocol name	`string`	`"Allow inbound %s traffic"`	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
storage_autoscaling_disable_scale_in	If the value is true, scale in is disabled and the target tracking policy won't remove capacity from the scalable resource	`bool`	`false`	no
storage_autoscaling_max_capacity	Maximum size the autoscaling policy can scale storage. Defaults to `broker_volume_size`	`number`	`null`	no
storage_autoscaling_target_value	Percentage of storage used to trigger autoscaled storage increase	`number`	`60`	no
subnet_ids	Subnet IDs for Client Broker	`list(string)`	n/a	yes
tags	Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`). Neither the tag keys nor the tag values will be modified by this module.	`map(string)`	`{}`	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	`string`	`null`	no
vpc_id	The ID of the VPC where the Security Group will be created.	`string`	n/a	yes
zone_id	Route53 DNS Zone ID for MSK broker hostnames	`string`	`null`	no

Outputs

Name	Description
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_public_sasl_iam	Comma separated list of one or more DNS names (or IP addresses) and SASL IAM port pairs for public access to the Kafka cluster using SASL/IAM
bootstrap_brokers_public_sasl_scram	Comma separated list of one or more DNS names (or IP addresses) and SASL SCRAM port pairs for public access to the Kafka cluster using SASL/SCRAM
bootstrap_brokers_public_tls	Comma separated list of one or more DNS names (or IP addresses) and TLS port pairs for public access to the Kafka cluster using TLS
bootstrap_brokers_sasl_iam	Comma separated list of one or more DNS names (or IP addresses) and SASL IAM port pairs for access to the Kafka cluster using SASL/IAM
bootstrap_brokers_sasl_scram	Comma separated list of one or more DNS names (or IP addresses) and SASL SCRAM port pairs for access to the Kafka cluster using SASL/SCRAM
bootstrap_brokers_tls	Comma separated list of one or more DNS names (or IP addresses) and TLS port pairs for access to the Kafka cluster using TLS
broker_endpoints	List of broker endpoints
cluster_arn	Amazon Resource Name (ARN) of the MSK cluster
cluster_name	MSK Cluster name
config_arn	Amazon Resource Name (ARN) of the MSK configuration
current_version	Current version of the MSK Cluster
hostnames	List of MSK Cluster broker DNS hostnames
latest_revision	Latest revision of the MSK configuration
security_group_arn	The ARN of the created security group
security_group_id	The ID of the created security group
security_group_name	n/a
storage_mode	Storage mode for supported storage tiers
zookeeper_connect_string	Comma separated list of one or more hostname:port pairs to connect to the Apache Zookeeper cluster
zookeeper_connect_string_tls	Comma separated list of one or more hostname:port pairs to connect to the Apache Zookeeper cluster via TLS

Related Projects

Check out these related projects.

terraform-null-label - Terraform module designed to generate consistent names and tags for resources. Use terraform-null-label to implement a strict naming convention.
terraform-aws-route53-cluster-hostname - Terraform module to define a consistent AWS Route53 hostname
terraform-aws-vpc - Terraform module to provision a VPC with Internet Gateway.

References

For additional context, refer to some of these links.

Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
Terraform random_integer Resource - The resource random_integer generates random values from a given range, described by the min and max attributes of a given resource.
Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration

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	resource "aws_msk_configuration" "config" {
	count = local.enabled ? 1 : 0
	kafka_versions = [var.kafka_version]
	name = module.this.id
	description = "Manages an Amazon Managed Streaming for Kafka configuration"

	server_properties = join("\n", [for k in keys(var.properties) : format("%s = %s", k, var.properties[k])])
	}

	resource "aws_msk_configuration" "config" {
	count = local.enabled ? 1 : 0
	kafka_versions = [var.kafka_version]
	name = module.this.id
	description = "Manages an Amazon Managed Streaming for Kafka configuration"

	server_properties = join("\n", [for k in keys(var.properties) : format("%s = %s", k, var.properties[k])])
	}

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module.test-kafka-cluster.module.msk_cluster.module.security_group.aws_security_group.cbd[0] will be created

module.test-kafka-cluster.module.msk_cluster.module.security_group.random_id.rule_change_forces_new_security_group[0] will be created

module.test-kafka-cluster.module.msk_cluster.module.broker_security_group.aws_security_group.default[0] will be destroyed

(because aws_security_group.default is not in configuration)

module.test-kafka-cluster.module.msk_cluster.aws_msk_cluster.default[0] must be replaced

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