Provides an ElastiCache Replication Group resource. For working with Memcached or single primary Redis instances (Cluster Mode Disabled), see the aws_elasticache_cluster
resource.
To create a single shard primary with single read replica:
resource "aws_elasticache_replication_group" "example" { automatic_failover_enabled = true availability_zones = ["us-west-2a", "us-west-2b"] replication_group_id = "tf-rep-group-1" replication_group_description = "test description" node_type = "cache.m3.medium" number_cache_clusters = 2 parameter_group_name = "default.redis3.2" port = 6379 }
You have two options for adjusting the number of replicas:
number_cache_clusters
directly. This will attempt to automatically add or remove replicas, but provides no granular control (e.g. preferred availability zone, cache cluster ID) for the added or removed replicas. This also currently expects cache cluster IDs in the form of replication_group_id-00#
. aws_elasticache_cluster
resource and its replication_group_id
attribute. In this situation, you will need to utilize the lifecycle configuration block with ignore_changes
to prevent perpetual differences during Terraform plan with the number_cache_cluster
attribute. resource "aws_elasticache_replication_group" "example" { automatic_failover_enabled = true availability_zones = ["us-west-2a", "us-west-2b"] replication_group_id = "tf-rep-group-1" replication_group_description = "test description" node_type = "cache.m3.medium" number_cache_clusters = 2 parameter_group_name = "default.redis3.2" port = 6379 lifecycle { ignore_changes = ["number_cache_clusters"] } } resource "aws_elasticache_cluster" "replica" { count = 1 cluster_id = "tf-rep-group-1-${count.index}" replication_group_id = "${aws_elasticache_replication_group.example.id}" }
To create two shards with a primary and a single read replica each:
resource "aws_elasticache_replication_group" "baz" { replication_group_id = "tf-redis-cluster" replication_group_description = "test description" node_type = "cache.m1.small" port = 6379 parameter_group_name = "default.redis3.2.cluster.on" automatic_failover_enabled = true cluster_mode { replicas_per_node_group = 1 num_node_groups = 2 } }
Note: We currently do not support passing a
primary_cluster_id
in order to create the Replication Group.
Note: Automatic Failover is unavailable for Redis versions earlier than 2.8.6, and unavailable on T1 and T2 node types. See the Amazon Replication with Redis guide for full details on using Replication Groups.
The following arguments are supported:
replication_group_id
– (Required) The replication group identifier. This parameter is stored as a lowercase string. replication_group_description
– (Required) A user-created description for the replication group. number_cache_clusters
- (Required for Cluster Mode Disabled) The number of cache clusters (primary and replicas) this replication group will have. If Multi-AZ is enabled, the value of this parameter must be at least 2. Updates will occur before other modifications. node_type
- (Required) The compute and memory capacity of the nodes in the node group. automatic_failover_enabled
- (Optional) Specifies whether a read-only replica will be automatically promoted to read/write primary if the existing primary fails. If true, Multi-AZ is enabled for this replication group. If false, Multi-AZ is disabled for this replication group. Must be enabled for Redis (cluster mode enabled) replication groups. Defaults to false
. auto_minor_version_upgrade
- (Optional) Specifies whether a minor engine upgrades will be applied automatically to the underlying Cache Cluster instances during the maintenance window. Defaults to true
. availability_zones
- (Optional) A list of EC2 availability zones in which the replication group's cache clusters will be created. The order of the availability zones in the list is not important. engine
- (Optional) The name of the cache engine to be used for the clusters in this replication group. e.g. redis
at_rest_encryption_enabled
- (Optional) Whether to enable encryption at rest. transit_encryption_enabled
- (Optional) Whether to enable encryption in transit. auth_token
- (Optional) The password used to access a password protected server. Can be specified only if transit_encryption_enabled = true
. engine_version
- (Optional) The version number of the cache engine to be used for the cache clusters in this replication group. parameter_group_name
- (Optional) The name of the parameter group to associate with this replication group. If this argument is omitted, the default cache parameter group for the specified engine is used. port
– (Optional) 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) The name of the cache subnet group to be used for the replication group. security_group_names
- (Optional) A list of cache security group names to associate with this replication group. security_group_ids
- (Optional) One or more Amazon VPC security groups associated with this replication group. Use this parameter only when you are creating a replication group in an Amazon Virtual Private Cloud 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_name
- (Optional) The name of a snapshot from which to restore data into the new node group. Changing the snapshot_name
forces a new resource. maintenance_window
– (Optional) Specifies the weekly time range for when maintenance on the cache cluster is performed. The format is ddd:hh24:mi-ddd:hh24:mi
(24H Clock UTC). The minimum maintenance window is a 60 minute period. Example: sun:05:00-sun:09:00
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
snapshot_window
- (Optional, Redis only) The daily time range (in UTC) during which ElastiCache will begin taking a daily snapshot of your cache cluster. The minimum snapshot window is a 60 minute period. 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. Please note that setting a snapshot_retention_limit
is not supported on cache.t1.micro or cache.t2.* cache nodes apply_immediately
- (Optional) Specifies whether any modifications are applied immediately, or during the next maintenance window. Default is false
. tags
- (Optional) A mapping of tags to assign to the resource cluster_mode
- (Optional) Create a native redis cluster. automatic_failover_enabled
must be set to true. Cluster Mode documented below. Only 1 cluster_mode
block is allowed. Cluster Mode (cluster_mode
) supports the following:
replicas_per_node_group
- (Required) Specify the number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource. num_node_groups
- (Required) Specify the number of node groups (shards) for this Redis replication group. Changing this number will trigger an online resizing operation before other settings modifications. In addition to all arguments above, the following attributes are exported:
id
- The ID of the ElastiCache Replication Group. configuration_endpoint_address
- The address of the replication group configuration endpoint when cluster mode is enabled. primary_endpoint_address
- (Redis only) The address of the endpoint for the primary node in the replication group, if the cluster mode is disabled. member_clusters
- The identifiers of all the nodes that are part of this replication group. aws_elasticache_replication_group
provides the following Timeouts configuration options:
create
- (Default 60m
) How long to wait for a replication group to be created. delete
- (Default 40m
) How long to wait for a replication group to be deleted. update
- (Default 40m
) How long to wait for replication group settings to be updated. This is also separately used for adding/removing replicas and online resize operation completion, if necessary. ElastiCache Replication Groups can be imported using the replication_group_id
, e.g.
$ terraform import aws_elasticache_replication_group.my_replication_group replication-group-1
© 2018 HashiCorpLicensed under the MPL 2.0 License.
https://www.terraform.io/docs/providers/aws/r/elasticache_replication_group.html