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aws | AWS: aws_elasticache_cluster | docs-aws-resource-elasticache-cluster | Provides an ElastiCache Cluster resource. |
aws_elasticache_cluster
Provides an ElastiCache Cluster resource.
Changes to a Cache Cluster can occur when you manually change a
parameter, such as node_type
, and are reflected in the next maintenance
window. Because of this, Terraform may report a difference in its planning
phase because a modification has not yet taken place. You can use the
apply_immediately
flag to instruct the service to apply the change immediately
(see documentation below).
~> Note: using apply_immediately
can result in a
brief downtime as the server reboots. See the AWS Docs on
Modifying an ElastiCache Cache Cluster for more information.
Example Usage
resource "aws_elasticache_cluster" "bar" {
cluster_id = "cluster-example"
engine = "memcached"
node_type = "cache.t2.micro"
port = 11211
num_cache_nodes = 1
parameter_group_name = "default.memcached1.4"
}
Argument Reference
The following arguments are supported:
-
cluster_id
– (Required) Group identifier. ElastiCache converts this name to lowercase -
engine
– (Required) Name of the cache engine to be used for this cache cluster. Valid values for this parameter arememcached
orredis
-
engine_version
– (Optional) Version number of the cache engine to be used. See Selecting a Cache Engine and Version in the AWS Documentation center for supported versions -
maintenance_window
– (Optional) Specifies the weekly time range for when maintenance on the cache cluster is performed. The format isddd:hh24:mi-ddd:hh24:mi
(24H Clock UTC). The minimum maintenance window is a 60 minute period. Example:sun:05:00-sun:09:00
-
node_type
– (Required) The compute and memory capacity of the nodes. See Available Cache Node Types for supported node types -
num_cache_nodes
– (Required) The initial number of cache nodes that the cache cluster will have. For Redis, this value must be 1. For Memcache, this value must be between 1 and 20. If this number is reduced on subsequent runs, the highest numbered nodes will be removed. -
parameter_group_name
– (Required) Name of the parameter group to associate with this cache cluster -
port
– (Required) The port number on which each of the cache nodes will accept connections. For Memcache the default is 11211, and for Redis the default port is 6379. -
subnet_group_name
– (Optional, VPC only) Name of the subnet group to be used for the cache cluster. -
security_group_names
– (Optional, EC2 Classic only) List of security group names to associate with this cache cluster -
security_group_ids
– (Optional, VPC only) One or more VPC security groups associated with the cache cluster -
apply_immediately
- (Optional) Specifies whether any database modifications are applied immediately, or during the next maintenance window. Default isfalse
. See Amazon ElastiCache Documentation for more information. (Available since v0.6.0) -
snapshot_arns
– (Optional) A single-element string list containing an Amazon Resource Name (ARN) of a Redis RDB snapshot file stored in Amazon S3. Example:arn:aws:s3:::my_bucket/snapshot1.rdb
-
snapshot_window
- (Optional, Redis only) The daily time range (in UTC) during which ElastiCache will begin taking a daily snapshot of your cache cluster. Example: 05:00-09:00 -
snapshot_retention_limit
- (Optional, Redis only) The number of days for which ElastiCache will retain automatic cache cluster snapshots before deleting them. For example, if you set SnapshotRetentionLimit to 5, then a snapshot that was taken today will be retained for 5 days before being deleted. If the value of SnapshotRetentionLimit is set to zero (0), backups are turned off -
notification_topic_arn
– (Optional) An Amazon Resource Name (ARN) of an SNS topic to send ElastiCache notifications to. Example:arn:aws:sns:us-east-1:012345678999:my_sns_topic
-
az_mode
- (Optional, Memcached only) Specifies whether the nodes in this Memcached node group are created in a single Availability Zone or created across multiple Availability Zones in the cluster's region. Valid values for this parameter aresingle-az
orcross-az
, default issingle-az
. If you want to choosecross-az
,num_cache_nodes
must be greater than1
-
availability_zone
- (Optional) The Availability Zone for the cache cluster. If you want to create cache nodes in multi-az, useavailability_zones
-
availability_zones
- (Optional, Memcached only) List of Availability Zones in which the cache nodes will be created. If you want to create cache nodes in single-az, useavailability_zone
-
tags
- (Optional) A mapping of tags to assign to the resource
~> NOTE: Snapshotting functionality is not compatible with t2 instance types.
Attributes Reference
The following attributes are exported:
-
cache_nodes
- List of node objects includingid
,address
,port
andavailability_zone
. Referenceable e.g. as${aws_elasticache_cluster.bar.cache_nodes.0.address}
-
configuration_endpoint
- (Memcached only) The configuration endpoint to allow host discovery