y0zg / terraform-aws-msk-apache-kafka-cluster

Terraform module to provision AWS MSK

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Cloud Posse

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.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

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Benchmark Description
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CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
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PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance


IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

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"

  namespace              = "eg"
  stage                  = "prod"
  name                   = "app"
  vpc_id                 = "vpc-XXXXXXXX"
  zone_id                = "Z14EN2YD427LRQ"
  subnet_ids             = ["subnet-XXXXXXXXX", "subnet-YYYYYYYY"]
  kafka_version          = "2.4.1"
  number_of_broker_nodes = 2 # this has to be a multiple of the # of subnet_ids
  broker_instance_type   = "kafka.m5.large"

  # security groups to put on the cluster itself
  associated_security_group_ids = ["sg-XXXXXXXXX", "sg-YYYYYYYY"]
  # security groups to give access to the cluster
  associated_security_group_ids = ["sg-XXXXXXXXX", "sg-YYYYYYYY"]


Here is an 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


Name Version
terraform >= 0.14.0
aws >= 3.0


Name Version
aws >= 3.0


Name Source Version
broker_security_group cloudposse/security-group/aws 0.4.2
hostname cloudposse/route53-cluster-hostname/aws 0.12.2
this cloudposse/label/null 0.25.0


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


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 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.
To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .
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
allowed_cidr_blocks List of CIDR blocks to be allowed to connect to the cluster 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. 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
broker_instance_type The instance type to use for the Kafka brokers string n/a yes
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_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 Enables client authentication via IAM policies bool false no
client_sasl_scram_enabled Enables SCRAM client authentication via AWS Secrets Manager. bool false no
client_sasl_scram_secret_association_arns List of AWS Secrets Manager secret ARNs for scram authentication. list(string) [] 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.
"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": [
"name": null,
"namespace": null,
"regex_replace_chars": null,
"stage": null,
"tags": {},
"tenant": null
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
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
jmx_exporter_enabled Set true to enable the JMX Exporter bool false no
kafka_version The desired Kafka software version 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.
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.
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
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 n/a yes
properties Contents of the server.properties file. Supported properties are documented in the MSK Developer Guide map(string) {} 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 recommend setting this true on new security groups, but default it to false because true
will cause existing security groups to be replaced, possibly requiring the resource to be deleted and recreated.
Note that changing this value will always cause the security group to be replaced.
bool false 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 "MSK broker access" 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
security_groups DEPRECATED: Use allowed_security_group_ids instead.
List of security group IDs to be allowed to connect to the cluster
list(string) [] 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 VPC ID where subnets will be created (e.g. vpc-aceb2723) string n/a yes
zone_id Route53 DNS Zone ID for MSK broker hostnames string null no


Name Description
all_brokers A list of all brokers
bootstrap_brokers A comma separated list of one or more hostname:port pairs of kafka brokers suitable to boostrap connectivity to the kafka cluster
bootstrap_brokers_iam A comma separated list of one or more DNS names (or IPs) and TLS port pairs kafka brokers suitable to boostrap connectivity using SASL/IAM to the kafka cluster.
bootstrap_brokers_scram A comma separated list of one or more DNS names (or IPs) and TLS port pairs kafka brokers suitable to boostrap connectivity using SASL/SCRAM to the kafka cluster.
bootstrap_brokers_tls A comma separated list of one or more DNS names (or IPs) and TLS port pairs kafka brokers suitable to boostrap connectivity to the kafka cluster
cluster_arn Amazon Resource Name (ARN) of the MSK cluster
cluster_name MSK Cluster name
config_arn Amazon Resource Name (ARN) of the configuration
current_version Current version of the MSK Cluster used for updates
hostname Comma separated list of one or more MSK Cluster Broker DNS hostname
latest_revision Latest revision of the configuration
security_group_id The ID of the security group rule
security_group_name The name of the security group rule
zookeeper_connect_string A comma separated list of one or more hostname:port pairs to use to connect to the Apache Zookeeper cluster

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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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Erik Osterman
Erik Osterman
Hugo Samayoa
Hugo Samayoa
Yonatan Koren
Yonatan Koren

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Terraform module to provision AWS MSK

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