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main.tf
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main.tf
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#
# Security Group Resources
#
resource "aws_security_group" "default" {
count = module.this.enabled && var.use_existing_security_groups == false ? 1 : 0
vpc_id = var.vpc_id
name = module.this.id
tags = module.this.tags
}
resource "aws_security_group_rule" "egress" {
count = module.this.enabled && var.use_existing_security_groups == false ? 1 : 0
description = "Allow outbound traffic from existing cidr blocks"
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = var.egress_cidr_blocks
security_group_id = join("", aws_security_group.default.*.id)
type = "egress"
}
resource "aws_security_group_rule" "ingress_security_groups" {
count = module.this.enabled && var.use_existing_security_groups == false ? length(var.allowed_security_groups) : 0
description = "Allow inbound traffic from existing Security Groups"
from_port = var.port
to_port = var.port
protocol = "tcp"
source_security_group_id = var.allowed_security_groups[count.index]
security_group_id = join("", aws_security_group.default.*.id)
type = "ingress"
}
resource "aws_security_group_rule" "ingress_cidr_blocks" {
count = module.this.enabled && var.use_existing_security_groups == false && length(var.allowed_cidr_blocks) > 0 ? 1 : 0
description = "Allow inbound traffic from CIDR blocks"
from_port = var.port
to_port = var.port
protocol = "tcp"
cidr_blocks = var.allowed_cidr_blocks
security_group_id = join("", aws_security_group.default.*.id)
type = "ingress"
}
locals {
elasticache_subnet_group_name = var.elasticache_subnet_group_name != "" ? var.elasticache_subnet_group_name : join("", aws_elasticache_subnet_group.default.*.name)
# if !cluster, then node_count = replica cluster_size, if cluster then node_count = shard*(replica + 1)
# Why doing this 'The "count" value depends on resource attributes that cannot be determined until apply'. So pre-calculating
member_clusters_count = (var.cluster_mode_enabled
?
(var.cluster_mode_num_node_groups * (var.cluster_mode_replicas_per_node_group + 1))
:
var.cluster_size
)
elasticache_member_clusters = module.this.enabled ? tolist(aws_elasticache_replication_group.default.0.member_clusters) : []
}
resource "aws_elasticache_subnet_group" "default" {
count = module.this.enabled && var.elasticache_subnet_group_name == "" && length(var.subnets) > 0 ? 1 : 0
name = module.this.id
subnet_ids = var.subnets
}
resource "aws_elasticache_parameter_group" "default" {
count = module.this.enabled ? 1 : 0
name = module.this.id
family = var.family
dynamic "parameter" {
for_each = var.cluster_mode_enabled ? concat([{ name = "cluster-enabled", value = "yes" }], var.parameter) : var.parameter
content {
name = parameter.value.name
value = parameter.value.value
}
}
}
resource "aws_elasticache_replication_group" "default" {
count = module.this.enabled ? 1 : 0
auth_token = var.transit_encryption_enabled ? var.auth_token : null
replication_group_id = var.replication_group_id == "" ? module.this.id : var.replication_group_id
replication_group_description = module.this.id
node_type = var.instance_type
number_cache_clusters = var.cluster_mode_enabled ? null : var.cluster_size
port = var.port
parameter_group_name = join("", aws_elasticache_parameter_group.default.*.name)
availability_zones = length(var.availability_zones) == 0 ? null : [for n in range(0, var.cluster_size) : element(var.availability_zones, n)]
automatic_failover_enabled = var.automatic_failover_enabled
multi_az_enabled = var.multi_az_enabled
subnet_group_name = local.elasticache_subnet_group_name
security_group_ids = var.use_existing_security_groups ? var.existing_security_groups : [join("", aws_security_group.default.*.id)]
maintenance_window = var.maintenance_window
notification_topic_arn = var.notification_topic_arn
engine_version = var.engine_version
at_rest_encryption_enabled = var.at_rest_encryption_enabled
transit_encryption_enabled = var.auth_token != null ? coalesce(true, var.transit_encryption_enabled) : var.transit_encryption_enabled
kms_key_id = var.at_rest_encryption_enabled ? var.kms_key_id : null
snapshot_name = var.snapshot_name
snapshot_arns = var.snapshot_arns
snapshot_window = var.snapshot_window
snapshot_retention_limit = var.snapshot_retention_limit
apply_immediately = var.apply_immediately
tags = module.this.tags
dynamic "cluster_mode" {
for_each = var.cluster_mode_enabled ? ["true"] : []
content {
replicas_per_node_group = var.cluster_mode_replicas_per_node_group
num_node_groups = var.cluster_mode_num_node_groups
}
}
}
#
# CloudWatch Resources
#
resource "aws_cloudwatch_metric_alarm" "cache_cpu" {
count = module.this.enabled && var.cloudwatch_metric_alarms_enabled ? local.member_clusters_count : 0
alarm_name = "${element(local.elasticache_member_clusters, count.index)}-cpu-utilization"
alarm_description = "Redis cluster CPU utilization"
comparison_operator = "GreaterThanThreshold"
evaluation_periods = "1"
metric_name = "CPUUtilization"
namespace = "AWS/ElastiCache"
period = "300"
statistic = "Average"
threshold = var.alarm_cpu_threshold_percent
dimensions = {
CacheClusterId = element(local.elasticache_member_clusters, count.index)
}
alarm_actions = var.alarm_actions
ok_actions = var.ok_actions
depends_on = [aws_elasticache_replication_group.default]
}
resource "aws_cloudwatch_metric_alarm" "cache_memory" {
count = module.this.enabled && var.cloudwatch_metric_alarms_enabled ? local.member_clusters_count : 0
alarm_name = "${element(local.elasticache_member_clusters, count.index)}-freeable-memory"
alarm_description = "Redis cluster freeable memory"
comparison_operator = "LessThanThreshold"
evaluation_periods = "1"
metric_name = "FreeableMemory"
namespace = "AWS/ElastiCache"
period = "60"
statistic = "Average"
threshold = var.alarm_memory_threshold_bytes
dimensions = {
CacheClusterId = element(local.elasticache_member_clusters, count.index)
}
alarm_actions = var.alarm_actions
ok_actions = var.ok_actions
depends_on = [aws_elasticache_replication_group.default]
}
module "dns" {
source = "cloudposse/route53-cluster-hostname/aws"
version = "0.12.0"
enabled = module.this.enabled && var.zone_id != "" ? true : false
dns_name = var.dns_subdomain != "" ? var.dns_subdomain : module.this.id
ttl = 60
zone_id = var.zone_id
records = var.cluster_mode_enabled ? [join("", aws_elasticache_replication_group.default.*.configuration_endpoint_address)] : [join("", aws_elasticache_replication_group.default.*.primary_endpoint_address)]
context = module.this.context
}