Skip to content

cloudposse/terraform-aws-vpc-flow-logs-s3-bucket

Folders and files

NameName
Last commit message
Last commit date

Latest commit

Β 

History

85 Commits
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 
Β 

Project Banner

Latest ReleaseLast UpdatedSlack Community

Terraform module to create AWS VPC Flow logs backed by S3.

Tip

πŸ‘½ Use Atmos with Terraform

Cloud Posse uses atmos to easily orchestrate multiple environments using Terraform.
Works with Github Actions, Atlantis, or Spacelift.

Watch demo of using Atmos with Terraform
Example of running atmos to manage infrastructure from our Quick Start tutorial.

Introduction

The module will create:

  • S3 bucket with server side encryption
  • KMS key to encrypt flow logs files in the bucket
  • Optional VPC Flow Log backed by the S3 bucket (this can be disabled, e.g. in multi-account environments if you want to create an S3 bucket in one account and VPC Flow Logs in different accounts)

Usage

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on Datadog), see test.

  module "vpc" {
    source  = "cloudposse/vpc/aws"
    version = "0.18.0"

    namespace  = "eg"
    stage      = "test"
    name       = "flowlogs"
    cidr_block = "172.16.0.0/16"
  }

  module "flow_logs" {
    source  = "cloudposse/vpc-flow-logs-s3-bucket/aws"
    version = "0.8.0"

    namespace  = "eg"
    stage      = "test"
    name       = "flowlogs"

    vpc_id = module.vpc.vpc_id
  }

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.

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 >= 1.3.0
aws >= 4.9.0

Providers

Name Version
aws >= 4.9.0

Modules

Name Source Version
bucket_name cloudposse/label/null 0.25.0
kms_key cloudposse/kms-key/aws 0.12.2
s3_log_storage_bucket cloudposse/s3-log-storage/aws 1.4.3
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_flow_log.default resource
aws_caller_identity.current data source
aws_iam_policy_document.bucket data source
aws_iam_policy_document.kms data source
aws_partition.current data source

Inputs

Name Description Type Default Required
access_log_bucket_name Name of the S3 bucket where S3 access log will be sent to string "" no
access_log_bucket_prefix Prefix to prepend to the current S3 bucket name, where S3 access logs will be sent to string "logs/" no
acl The canned ACL to apply. We recommend log-delivery-write for compatibility with AWS services string "log-delivery-write" 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_ssl_requests_only Set to true to require requests to use Secure Socket Layer (HTTPS/SSL). This will explicitly deny access to HTTP requests bool true 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
bucket_key_enabled Set this to true to use Amazon S3 Bucket Keys for SSE-KMS, which may reduce the number of AWS KMS requests.
For more information, see: https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucket-key.html
bool true no
bucket_name Bucket name. If not provided, the bucket will be created with a name generated from the context. string "" no
bucket_notifications_enabled Send notifications for the object created events. Used for 3rd-party log collection from a bucket bool false no
bucket_notifications_prefix Prefix filter. Used to manage object notifications string "" no
bucket_notifications_type Type of the notification configuration. Only SQS is supported. string "SQS" 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
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
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
expiration_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days after which to expunge the objects
number null no
flow_log_enabled Enable/disable the Flow Log creation. Useful in multi-account environments where the bucket is in one account, but VPC Flow Logs are in different accounts bool true no
force_destroy A boolean that indicates all objects should be deleted from the bucket so that the bucket can be destroyed without error. These objects are not recoverable bool false no
glacier_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days after which to move the data to the Glacier Flexible Retrieval storage tier
number null 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
kms_key_arn ARN (or alias) of KMS that will be used for s3 bucket encryption. string "" no
kms_policy_source_json Additional IAM policy document that can optionally be merged with default created KMS policy string "" no
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
lifecycle_configuration_rules A list of lifecycle V2 rules
list(object({
enabled = bool
id = string

abort_incomplete_multipart_upload_days = number

# filter_and is the and configuration block inside the filter configuration.
# This is the only place you should specify a prefix.
filter_and = optional(object({
object_size_greater_than = optional(number) # integer >= 0
object_size_less_than = optional(number) # integer >= 1
prefix = optional(string)
tags = optional(map(string))
}))
expiration = optional(object({
date = optional(string) # string, RFC3339 time format, GMT
days = optional(number) # integer > 0
expired_object_delete_marker = optional(bool)
}))
noncurrent_version_expiration = optional(object({
newer_noncurrent_versions = optional(number) # integer > 0
noncurrent_days = optional(number) # integer >= 0
}))
transition = optional(list(object({
date = optional(string) # string, RFC3339 time format, GMT
days = optional(number) # integer >= 0
storage_class = string # string/enum, one of GLACIER, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, DEEP_ARCHIVE, GLACIER_IR.
})), [])
noncurrent_version_transition = optional(list(object({
newer_noncurrent_versions = optional(number) # integer >= 0
noncurrent_days = optional(number) # integer >= 0
storage_class = string # string/enum, one of GLACIER, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, DEEP_ARCHIVE, GLACIER_IR.
})), [])
}))
[] no
lifecycle_prefix (Deprecated, use lifecycle_configuration_rules instead)
Prefix filter. Used to manage object lifecycle events
string null no
lifecycle_rule_enabled DEPRECATED: Use lifecycle_configuration_rules instead.
When true, configures lifecycle events on this bucket using individual (now deprecated) variables.
When false, lifecycle events are not configured using individual (now deprecated) variables, but lifecycle_configuration_rules still apply.
When null, lifecycle events are configured using individual (now deprecated) variables only if lifecycle_configuration_rules is empty.
bool null no
lifecycle_tags (Deprecated, use lifecycle_configuration_rules instead)
Tags filter. Used to manage object lifecycle events
map(string) null no
log_format The fields to include in the flow log record, in the order in which they should appear. string null 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
noncurrent_version_expiration_days (Deprecated, use lifecycle_configuration_rules instead)
Specifies when non-current object versions expire (in days)
number null no
noncurrent_version_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Specifies (in days) when noncurrent object versions transition to Glacier Flexible Retrieval
number null no
object_lock_configuration A configuration for S3 object locking.
object({
mode = string # Valid values are GOVERNANCE and COMPLIANCE.
days = number
years = number
})
null 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_object_ownership Specifies the S3 object ownership control.
Valid values are ObjectWriter, BucketOwnerPreferred, and BucketOwnerEnforced."
Default of BucketOwnerPreferred is for backwards compatibility.
Recommended setting is BucketOwnerEnforced, which will be used if you pass in null.
string "BucketOwnerPreferred" no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
standard_transition_days (Deprecated, use lifecycle_configuration_rules instead)
Number of days to persist in the standard storage tier before moving to the infrequent access tier
number null no
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
traffic_type The type of traffic to capture. Valid values: ACCEPT, REJECT, ALL string "ALL" no
versioning_enabled Enable object versioning, keeping multiple variants of an object in the same bucket bool false no
vpc_id VPC ID to create flow logs for string null no

Outputs

Name Description
bucket_arn Bucket ARN
bucket_domain_name FQDN of bucket
bucket_id Bucket Name (aka ID)
bucket_notifications_sqs_queue_arn Notifications SQS queue ARN
bucket_prefix Bucket prefix configured for lifecycle rules
flow_log_arn Flow Log ARN
flow_log_id Flow Log ID
kms_alias_arn KMS Alias ARN
kms_alias_name KMS Alias name
kms_key_arn KMS Key ARN
kms_key_id KMS Key ID

Related Projects

Check out these related projects.

  • terraform-aws-vpc - Terraform Module that defines a VPC with public/private subnets across multiple AZs with Internet Gateways
  • CIS AWS Foundations Benchmark in the AWS Cloud - CIS Benchmarks are consensus-based configuration guidelines developed by experts in US government, business, industry, and academia to help organizations assess and improve security

Tip

Use Terraform Reference Architectures for AWS

Use Cloud Posse's ready-to-go terraform architecture blueprints for AWS to get up and running quickly.

βœ… We build it together with your team.
βœ… Your team owns everything.
βœ… 100% Open Source and backed by fanatical support.

Request Quote

πŸ“š Learn More

Cloud Posse is the leading DevOps Accelerator for funded startups and enterprises.

Your team can operate like a pro today.

Ensure that your team succeeds by using Cloud Posse's proven process and turnkey blueprints. Plus, we stick around until you succeed.

Day-0: Your Foundation for Success

  • Reference Architecture. You'll get everything you need from the ground up built using 100% infrastructure as code.
  • Deployment Strategy. Adopt a proven deployment strategy with GitHub Actions, enabling automated, repeatable, and reliable software releases.
  • Site Reliability Engineering. Gain total visibility into your applications and services with Datadog, ensuring high availability and performance.
  • Security Baseline. Establish a secure environment from the start, with built-in governance, accountability, and comprehensive audit logs, safeguarding your operations.
  • GitOps. Empower your team to manage infrastructure changes confidently and efficiently through Pull Requests, leveraging the full power of GitHub Actions.

Request Quote

Day-2: Your Operational Mastery

  • Training. Equip your team with the knowledge and skills to confidently manage the infrastructure, ensuring long-term success and self-sufficiency.
  • Support. Benefit from a seamless communication over Slack with our experts, ensuring you have the support you need, whenever you need it.
  • Troubleshooting. Access expert assistance to quickly resolve any operational challenges, minimizing downtime and maintaining business continuity.
  • Code Reviews. Enhance your team’s code quality with our expert feedback, fostering continuous improvement and collaboration.
  • Bug Fixes. Rely on our team to troubleshoot and resolve any issues, ensuring your systems run smoothly.
  • Migration Assistance. Accelerate your migration process with our dedicated support, minimizing disruption and speeding up time-to-value.
  • Customer Workshops. Engage with our team in weekly workshops, gaining insights and strategies to continuously improve and innovate.

Request Quote

✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For πŸ› bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Review our Code of Conduct and Contributor Guidelines.
  2. Fork the repo on GitHub
  3. Clone the project to your own machine
  4. Commit changes to your own branch
  5. Push your work back up to your fork
  6. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

🌎 Slack Community

Join our Open Source Community on Slack. It's FREE for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build totally sweet infrastructure.

πŸ“° Newsletter

Sign up for our newsletter and join 3,000+ DevOps engineers, CTOs, and founders who get insider access to the latest DevOps trends, so you can always stay in the know. Dropped straight into your Inbox every week β€” and usually a 5-minute read.

πŸ“† Office Hours

Join us every Wednesday via Zoom for your weekly dose of insider DevOps trends, AWS news and Terraform insights, all sourced from our SweetOps community, plus a live Q&A that you can’t find anywhere else. It's FREE for everyone!

License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

Trademarks

All other trademarks referenced herein are the property of their respective owners.


Copyright Β© 2017-2024 Cloud Posse, LLC

README footer

Beacon