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.
This project is part of our comprehensive "SweetOps" approach towards DevOps.
It's 100% Open Source and licensed under the APACHE2.
We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!
Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.
| Benchmark | Description |
|---|---|
| Infrastructure Security Compliance | |
| Center for Internet Security, KUBERNETES Compliance | |
| Center for Internet Security, AWS Compliance | |
| Center for Internet Security, AZURE Compliance | |
| Payment Card Industry Data Security Standards Compliance | |
| National Institute of Standards and Technology Compliance | |
| Information Security Management System, ISO/IEC 27001 Compliance | |
| Service Organization Control 2 Compliance | |
| Center for Internet Security, GCP Compliance | |
| 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.
| 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. |
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}"
}| Name | Version |
|---|---|
| terraform | >= 0.13.0 |
| Name | Version |
|---|---|
| aws | n/a |
| Name | Source | Version |
|---|---|---|
| this | cloudposse/label/null | 0.24.1 |
| 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 |
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| additional_tag_map | Additional tags for appending to tags_as_list_of_maps. Not added to tags. |
map(string) |
{} |
no |
| attributes | Additional attributes (e.g. 1) |
list(string) |
[] |
no |
| aws_sns_topic_arn | ARN of an already existing SNS topic. | string |
"" |
no |
| burst_balance_threshold | The minimum percent of General Purpose SSD (gp2) burst-bucket I/O credits available. | string |
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 |
{ |
no |
| cpu_credit_balance_threshold | The minimum number of CPU credits (t2 instances only) available. | string |
20 |
no |
| cpu_utilization_threshold | The maximum percentage of CPU utilization. | string |
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 namespace, environment, stage, name and attributes.Defaults to - (hyphen). Set to "" to use no delimiter at all. |
string |
null |
no |
| disk_queue_depth_threshold | The maximum number of outstanding IOs (read/write requests) waiting to access the disk. | string |
64 |
no |
| enabled | Set to false to prevent the module from creating any resources | bool |
null |
no |
| environment | Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' | string |
null |
no |
| free_storage_space_threshold | The minimum amount of available storage space in Byte. | string |
2000000000 |
no |
| freeable_memory_threshold | The minimum amount of available random access memory in Byte. | string |
64000000 |
no |
| id_length_limit | Limit id to this many characters (minimum 6).Set to 0 for unlimited length.Set to null for default, which is 0.Does not affect id_full. |
number |
null |
no |
| label_key_case | The letter case of label keys (tag names) (i.e. name, namespace, environment, stage, attributes) to use in tags.Possible values: lower, title, upper.Default value: title. |
string |
null |
no |
| label_order | The naming order of the id output and Name tag. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 5 elements, but at least one must be present. |
list(string) |
null |
no |
| label_value_case | The letter case of output label values (also used in tags and id).Possible values: lower, title, upper and none (no transformation).Default value: lower. |
string |
null |
no |
| name | Solution name, e.g. 'app' or 'jenkins' | string |
null |
no |
| namespace | Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' | string |
null |
no |
| regex_replace_chars | Regex to replace chars with empty string in namespace, environment, stage and name.If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits. |
string |
null |
no |
| stage | Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' | string |
null |
no |
| swap_usage_threshold | The maximum amount of swap space used on the DB instance in Byte. | string |
256000000 |
no |
| tags | Additional tags (e.g. map('BusinessUnit','XYZ') |
map(string) |
{} |
no |
| Name | Description |
|---|---|
| sns_topic_arn | The ARN of the SNS topic |
Available targets:
help Help screen
help/all Display help for all targets
help/short This help short screen
lint Lint terraform code
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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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