terraform-aws-elasticsearch-cloudwatch-sns-alarms

Terraform module that configures the recommended Amazon ElasticSearch Alarms using CloudWatch and sends alerts to an SNS topic. By default, this module creates an SNS topic, but it can be configured to point to an existing SNS topic (see example)

v1.x supports terraform v0.12+ syntax!
v2.0+ supports terraform v1.0+ syntax!

This project is inspired by CloudPosse
It's 100% Open Source and licensed under the APACHE2.

Metrics and Alarms

Area	Metric	Operator	Threshold	Rationale
Sharding	ClusterStatus.red	>=	1	At least one primary shard and its replicas are not allocated to a node
Sharding	ClusterStatus.yellow	>=	1	At least one replica shard is not allocated to a node
Storage	FreeStorageSpace	<=	20480 MB	A node in your cluster is down to low storage space. Note, this alarm uses the aggregate Minimum which means this alarm triggers per-node in your cluster. This logic is based-on the AWS Recommended Alarms. It does not however alarm based on an aggregate of free space remaining.
Storage	FreeStorageSpaceTotal	<=	20480 MB	The overall disk space free is low. This alarm uses Sum across all your nodes, this can be useful on multi-node clusters. Disabled by default, to enable this you must set monitor_free_storage_space_total_too_low to true, and free_storage_space_total_threshold. Recommended to set the threshold to the number of nodes in your cluster multiplied by the free_storage_space_threshold
Storage	ClusterIndexWritesBlocked	>=	1	Your cluster is blocking write requests.
Node Count	Nodes	<	x	This alarm indicates that at least one node in your cluster has been unreachable for one day
Snapshot	AutomatedSnapshotFailure	>=	1	An automated snapshot failed. This failure is often the result of a red cluster health status.
CPU	CPUUtilization	>=	80 %	100% CPU utilization isn't uncommon, but sustained high usage is problematic. Consider using larger instance types or more instances.
Memory	JVMMemoryPressure	>=	80 %	The cluster could encounter out of memory errors if usage increases. Consider scaling vertically.
CPU	MasterCPUUtilization	>=	80 %	Consider using larger instance types for your dedicated master nodes.
Memory	MasterJVMMemoryPressure	>=	80 %	Consider using larger instance types for your dedicated master nodes.
KMS	KMSKeyError	>=	1	The KMS encryption key that is used to encrypt data at rest in your domain is disabled. Re-enable it to restore normal operations
Memory	KMSKeyInaccessible	>=	80 %	The KMS encryption key that is used to encrypt data at rest in your domain has been deleted or has revoked its grants to Amazon ES

For more information please see: recommended Amazon ElasticSearch Alarms.

Examples

See the examples/ directory for working examples.

resource "aws_elasticsearch_domain" "es" {
  domain_name           = "example"
  elasticsearch_version = "7.10"

  cluster_config {
    instance_type = "r4.large.elasticsearch"
  }

  snapshot_options {
    automated_snapshot_start_hour = 23
  }

  tags = {
    Domain = "TestDomain"
  }
}

module "es_alarms" {
  source         = "github::https://github.com/dubiety/terraform-aws-elasticsearch-cloudwatch-sns-alarms.git?ref=master"
  domain_name    = "example"
  tags = {
    Domain = "TestDomain"
  }
}

You can alternatively have this module not create an SNS in case you have existing ones created elsewhere.

module "es_alarms" {
  source           = "github::https://github.com/dubiety/terraform-aws-elasticsearch-cloudwatch-sns-alarms.git?ref=master"
  domain_name      = "example"
  sns_topic        = "arn:aws:sns:us-east-1:123456123456:sns-to-slack"   # < Put your full SNS ARN here, if necessary read from var or a resource
  create_sns_topic = false
  tags = {
    Domain = "TestDomain"
  }
}

Inputs

Name	Description	Type	Default	Required
domain_name	The Elasticserach domain name you want to monitor.	string	-	yes
cluster_type	The type of cluster, single or multi-node	string	"single"	no
alarm_name_postfix	Alarm name postfix	string	""	no
alarm_name_prefix	Alarm name prefix	string	""	no
create_sns_topic	Will create an SNS topic, if you set this to false you MUST set sns_topic to a FULL ARN	bool	true	no
sns_topic	SNS topic you want to specify. If leave empty, it will use a prefix and a timestamp appended. If create_sns_topic is set to false, this MUST be a FULL ARN	string	""	no
sns_topic_postfix	SNS topic postfix	string	""	no
sns_topic_prefix	SNS topic prefix	string	""	no
tags	Tags to associate with all created resources	map	{}	no
cpu_utilization_threshold	The maximum percentage of CPU utilization	string	80	no
free_storage_space_threshold	The minimum amount of available storage space in MiB.	string	20480	no
jvm_memory_pressure_threshold	The maximum percentage of the Java heap used for all data nodes in the cluster	string	80	no
master_cpu_utilization_threshold	The maximum percentage of CPU utilization of master nodes	string	""	no
master_jvm_memory_pressure_threshold	The maximum percentage of the Java heap used for master nodes in the cluster	string	""	no
min_available_nodes	The minimum available (reachable) nodes to have, set to non-zero to enable alarm	string	0	no
monitor_automated_snapshot_failure	Enable monitoring of automated snapshot failure	bool	true	no
monitor_cluster_status_is_red	Enable monitoring of cluster status is in red	bool	true	no
monitor_cluster_status_is_yellow	Enable monitoring of cluster status is in yellow	bool	true	no
monitor_cluster_index_writes_blocked	Enable monitoring of cluster index writes being blocked	bool	true	no
monitor_cpu_utilization_too_high	Enable monitoring of CPU utilization is too high	bool	true	no
monitor_free_storage_space_too_low	Enable monitoring of minimum per-node free storage is too low	bool	true	no
monitor_free_storage_space_total_too_low	Enable monitoring of cluster total free storage is too low	bool	false	no
monitor_jvm_memory_pressure_too_high	Enable monitoring of JVM memory pressure is too high	bool	true	no
monitor_kms	Enable monitoring of KMS-related metrics, enable if using KMS	bool	false	no
monitor_master_cpu_utilization_too_high	Enable monitoring of CPU utilization of master nodes are too high. Only enable this when dedicated master is enabled	bool	false	no
monitor_master_jvm_memory_pressure_too_high	Enable monitoring of JVM memory pressure of master nodes are too high. Only enable this wwhen dedicated master is enabled	bool	false	no
monitor_min_available_nodes	Enable monitoring of minimum available nodes	bool	true	no
alarm_automated_snapshot_failure_periods	The number of periods to alert that automatic snapshots failed, raise this if desired to make less noisy	number	1	no
alarm_cluster_status_is_red_periods	The number of periods to alert that cluster status is red, raise this to be less noisy	number	1	no
alarm_cluster_status_is_yellow_periods	The number of periods before triggering the cluster status is yellow, raise this to be less noisy	number	1	no
alarm_cluster_index_writes_blocked_periods	The number of periods to alert that cluster index writes are blocked, raise this if desired to make less noisy	number	1	no
alarm_cpu_utilization_too_high_periods	The number of periods to alert that CPU usage is too high, raise this if desired to make less noisy	number	3	no
alarm_free_storage_space_too_low_periods	The number of periods before triggering the disk space is low, raise this to be less noisy	number	1	no
alarm_free_storage_space_total_too_low_periods	The number of periods before triggering the total disk space is low, raise this to be less noisy	number	1	no
alarm_jvm_memory_pressure_too_high_periods	The number of periods which it must be in the alarmed state to alert, raise this if desired to make less noisy	number	1	no
alarm_kms_periods	The number of periods to alert that kms has failed, raise this if desired to make less noisy	number	1	no
alarm_master_cpu_utilization_too_high_periods	The number of periods to alert that masters CPU usage is too high, raise this if desired to make less noisy	number	3	no
alarm_master_jvm_memory_pressure_too_high_periods	The number of periods which it must be in the alarmed state to alert, raise this if desired to make less noisy	number	1	no
alarm_min_available_nodes_periods	The number of periods to alert that minimum number of available nodes dropped below a threshold, raise this if desired to make less noisy	number	1	no
alarm_min_available_nodes_period	The period of the minimum available nodes should the statistics be applied in seconds	string	86400	no
alarm_automated_snapshot_failure_period	The period of the automated snapshot failure should the statistics be applied in seconds	string	60	no
alarm_cluster_index_writes_blocked_period	The period of the cluster index writes being blocked should the statistics be applied in seconds	string	300	no
alarm_cluster_status_is_red_period	The period of the cluster status is in red should the statistics be applied in seconds	string	60	no
alarm_cluster_status_is_yellow_period	The period of the cluster status is in yellow should the statistics be applied in seconds	string	60	no
alarm_cpu_utilization_too_high_period	The period of the CPU utilization is too high should the statistics be applied in seconds	string	900	no
alarm_free_storage_space_too_low_period	The period of the per-node minimum free storage is too low should the statistics be applied in seconds	string	60	no
alarm_free_storage_space_total_too_low_period	The period of the cluster total free storage is too low should the statistics be applied in seconds	string	60	no
alarm_jvm_memory_pressure_too_high_period	The period of the JVM memory pressure is too high should the statistics be applied in seconds	string	900	no
alarm_kms_period	The period of the KMS-related metrics should the statistics be applied in seconds	string	60	no
alarm_master_cpu_utilization_too_high_period	The period of the CPU utilization of master nodes are too high should the statistics be applied in seconds	string	900	no
alarm_master_jvm_memory_pressure_too_high_period	The period of the JVM memory pressure of master nodes are too high should the statistics be applied in seconds	string	900	no

Outputs

Name	Description
sns_topic_arn	The ARN of the SNS topic
sns_topic_name	The SNS topic name

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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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