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.
| 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 | Description | Type | Default | Required |
|---|---|---|---|---|
| burst_balance_threshold | The minimum percent of General Purpose SSD (gp2) burst-bucket I/O credits available. | string | 20 |
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 | - | yes |
| disk_queue_depth_threshold | The maximum number of outstanding IOs (read/write requests) waiting to access the disk. | string | 64 |
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 |
| swap_usage_threshold | The maximum amount of swap space used on the DB instance in Byte. | string | 256000000 |
no |
| alarm_name_postfix | Alarm name postfix | string | `` | no |
| alarm_name_prefix | Alarm name prefix | string | `` | no |
| sns_topic | SNS topic you want to specify. If leave empty, it will use a prefix and a timestampe appended | string | `` | no |
| Name | Description |
|---|---|
| sns_topic_arn | The ARN of the SNS topic |
| sns_topic_name | The SNS topic name |
Available targets:
help This help screen
help/all Display help for all targets
lint Lint terraform code
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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 Erik Osterman |
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