terraform-aws-elasticsearch-cloudwatch-sns-alarms

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

Create a set of sane Elasticsearch CloudWatch alerts for monitoring the health of an elasticsearch cluster.

v1.x supports terraform v0.12 syntax!

This project is inspired by CloudPosse

It's 100% Open Source and licensed under the APACHE2.

Usage

area	metric	comparison operator	threshold	rationale
Sharding	ClusterStatus.red	`>=`	1	At least one primary shard and its replicas are not allocated to a node for 1 minute 1 consecutive time. Threshold should always be 1.
Sharding	ClusterStatus.yellow	`>=`	1	At least one replica shard is not allocated to a node for 1 minute 1 consecutive time. Threshold should always be 1.
Storage	FreeStorageSpace	`<=`	20480 MB	A node in your cluster is down to 20 GiB of free storage space for 1 minute 1 consecutive time. This value is in MiB, so rather than 20480, we recommend setting it to 25% of the storage space for each node.
Storage	ClusterIndexWritesBlocked	`>=`	1	The cluster is blocking write requests for 5 minutes 1 consecutive time. Threshold should always be 1.
Node Count	Nodes	`<`	`x`	`x` is the number of nodes in your cluster. This alarm indicates that at least one node in your cluster has been unreachable for one day.
Snapshot	AutomatedSnapshotFailure	`>=`	1	An automated snapshot failed for 1 minute 1 consecutive time. This failure is often the result of a red cluster health status.
CPU	CPUUtilization	`>=`	80 %	CPU utilization average is >= 80% for 15 minutes, 3 consecutive times for the node cluster.
Memory	JVMMemoryPressure	`>=`	80 %	JVMMemoryPressure maximum is >= 80% for 15 minutes, 1 consecutive time.
CPU	MasterCPUUtilization	`>=`	80 %	Dedicated master nodes' CPU utilization is >= 80% for 15 minutes, 3 consecutive times.
Memory	MasterJVMMemoryPressure	`>=`	80 %	Dedicated master nodes' maximum JVM memory usage is >= 80% for 15 minutes, 1 consecutive time.

Examples

See the examples/ directory for working examples.

resource "aws_elasticsearch_domain" "es" {
  domain_name           = "example"
  elasticsearch_version = "6.3"

  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"
}

You can alternatively have this module not create an SNS incase 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
}

Inputs

Name	Description	Type	Default	Required
`domain_name`	The Elasticserach domain name you want to monitor.	string	-	yes
`alarm_name_postfix`	Alarm name postfix	string	`""`	no
`alarm_name_prefix`	Alarm name prefix	string	`""`	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 Byte.	string	`21474836480`	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	string	`1`	no
`monitor_automated_snapshot_failure`	Enable monitoring of automated snapshot failure	string	`true`	no
`monitor_cluster_index_writes_blocked`	Enable monitoring of cluster index writes being blocked	string	`true`	no
`monitor_cluster_status_is_red`	Enable monitoring of cluster status is in red	string	`true`	no
`monitor_cluster_status_is_yellow`	Enable monitoring of cluster status is in yellow	string	`true`	no
`monitor_cpu_utilization_too_high`	Enable monitoring of CPU utilization is too high	string	`true`	no
`monitor_free_storage_space_too_low`	Enable monitoring of cluster average free storage is to low	string	`true`	no
`monitor_insufficient_available_nodes`	Enable monitoring insufficient available nodes	string	`false`	no
`monitor_jvm_memory_pressure_too_high`	Enable monitoring of JVM memory pressure is too high	string	`true`	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	string	`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	string	`false`	no
`create_sns_topic`	Will create an SNS topic, if you set this to false you MUST set `sns_topic` to a FULL ARN	string	`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

Outputs

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

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Bug Reports & Feature Requests

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License

See LICENSE for full details.

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.

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