Terraform module that configures important RDS alerts using CloudWatch and sends them to an SNS topic.

Create a set of sane RDS CloudWatch alerts for monitoring the health of an RDS instance.

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Usage

area	metric	comparison operator	threshold	rationale
Storage	BurstBalance	<	20 %	20 % of credits allow you to burst for a few minutes which gives you enough time to a) fix the inefficiency, b) add capacity or c) switch to io1 storage type.
Storage	DiskQueueDepth	>	64	This number is calculated from our experience with RDS workloads.
Storage	FreeStorageSpace	<	2 GB	2 GB usually provides enough time to a) fix why so much space is consumed or b) add capacity. You can also modify this value to 10% of your database capacity.
CPU	CPUUtilization	>	80 %	Queuing theory tells us the latency increases exponentially with utilization. In practice, we see higher latency when utilization exceeds 80% and unacceptable high latency with utilization above 90%
CPU	CPUCreditBalance	<	20	One credit equals 1 minute of 100% usage of a vCPU. 20 credits should give you enough time to a) fix the inefficiency, b) add capacity or c) don't use t2 type.
Memory	FreeableMemory	<	64 MB	This number is calculated from our experience with RDS workloads.
Memory	SwapUsage	>	256 MB	Sometimes you can not entirely avoid swapping. But once the database accesses paged memory, it will slow down.

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

See the examples/ directory for working examples.

resource "aws_db_instance" "default" {
  allocated_storage    = 10
  storage_type         = "gp2"
  engine               = "mysql"
  engine_version       = "5.7"
  instance_class       = "db.t2.micro"
  identifier_prefix    = "rds-server-example"
  name                 = "mydb"
  username             = "foo"
  password             = "foobarbaz"
  parameter_group_name = "default.mysql5.7"
  apply_immediately    = "true"
  skip_final_snapshot  = "true"
}

module "rds_alarms" {
  source         = "git::https://github.com/cloudposse/terraform-aws-rds-cloudwatch-sns-alarms.git?ref=tags/0.1.5"
  db_instance_id = "${aws_db_instance.default.id}"
}

Requirements

Name	Version
terraform	>= 0.13.0
aws	>= 2.0

Providers

Name	Version
aws	>= 2.0

Modules

Name	Source	Version
label	cloudposse/label/null	0.25.0
subscription_label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0
topic_label	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_cloudwatch_metric_alarm.burst_balance_too_low	resource
aws_cloudwatch_metric_alarm.cpu_credit_balance_too_low	resource
aws_cloudwatch_metric_alarm.cpu_utilization_too_high	resource
aws_cloudwatch_metric_alarm.disk_queue_depth_too_high	resource
aws_cloudwatch_metric_alarm.free_storage_space_too_low	resource
aws_cloudwatch_metric_alarm.freeable_memory_too_low	resource
aws_cloudwatch_metric_alarm.swap_usage_too_high	resource
aws_db_event_subscription.default	resource
aws_sns_topic.default	resource
aws_sns_topic_policy.default	resource
aws_caller_identity.default	data source
aws_iam_policy_document.sns_topic_policy	data source

Inputs

Name	Description	Type	Default	Required
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
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
burst_balance_threshold	The minimum percent of General Purpose SSD (gp2) burst-bucket I/O credits available.	number	20	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
cpu_credit_balance_threshold	The minimum number of CPU credits (t2 instances only) available.	number	20	no
cpu_utilization_threshold	The maximum percentage of CPU utilization.	number	80	no
db_instance_id	The instance ID of the RDS database instance that you want to monitor.	string	n/a	yes
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
disk_queue_depth_threshold	The maximum number of outstanding IOs (read/write requests) waiting to access the disk.	number	64	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
free_storage_space_threshold	The minimum amount of available storage space in Byte.	number	2000000000	no
freeable_memory_threshold	The minimum amount of available random access memory in Byte.	number	64000000	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
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
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
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
swap_usage_threshold	The maximum amount of swap space used on the DB instance in Byte.	number	256000000	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

Outputs

Name	Description
sns_topic_arn	The ARN of the SNS topic

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code
  test/%                              Run Terraform commands in the examples/complete folder; e.g. make test/plan

Related Projects

Check out these related projects.

• terraform-aws-ec2-cloudwatch-sns-alarms - Terraform module that configures CloudWatch SNS alerts for EC2 instances
• terraform-aws-ecs-cloudwatch-sns-alarms - Terraform module for creating ECS service level alerts that go to an SNS endpoint
• terraform-aws-efs-cloudwatch-sns-alarms - Terraform module that configures CloudWatch SNS alerts for EFS
• terraform-aws-elasticache-cloudwatch-sns-alarms - Terraform module that configures CloudWatch SNS alerts for ElastiCache
• terraform-aws-lambda-cloudwatch-sns-alarms - Terraform module for creating a set of Lambda alarms and outputting to an endpoint
• terraform-aws-sqs-cloudwatch-sns-alarms - Terraform module for creating alarms for SQS and notifying endpoints

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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
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