Memcached (ElastiCache)¶
This page contains information about using the Memcached service in Handel. This service provides a Memcached cluster via the ElastiCache service.
Service Limitations¶
No Scheduled Maintenance Window Configuration¶
This service currently doesn’t allow you to change the maintenance window for your Memcached cluster.
No Snapshot Window Configuration¶
This service currently doesn’t allow you to change the snapshot window for your Memcached cluster.
No Restoration From Snapshot¶
This service currently doesn’t allow you to launch a cluster from a previous cluster snapshot.
Parameters¶
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| type | string | Yes | This must always be memcached for this service type. | |
| instance_type | string | Yes | The size of each Memcached instance in your cluster. See Choosing Your Node Size for more details. | |
| memcached_version | string | Yes | The version of Memcached to run. See Comparing Memcached Versions for a list of available versions. | |
| description | string | No | Parameter group for cluster. | The parameter group description of your cluster. |
| node_count | number | No | 1 | The number of memcached nodes you want in your cluster. |
| cache_parameters | Map<string,string> | No | Any cache parameters you wish for your Memcached cluster. See Memcached Specific Parameters for the list of parameters you can provide. | |
| tags | Resource Tags | No | Any tags you wish to apply to this Memcached cluster. |
Warning
Note that having more than 1 node in your cluster will greatly increase your cost. Each node you add to the cluster adds a full cache instance type node cost to your cluster cost.
For example, if you have a Memcached cluster of size 1, using a cache.m4.large instance, it will cost about $112/month.
If you have that same cache.m4.large type, but with a cluster size of 4, it will cost about $448/month since you are being charged for four full Memcached instances.
Be careful to calculate how much this service will cost you if you are using a cluster of more than 1 node.
Example Handel File¶
version: 1
name: my-memcached-cluster
environments:
dev:
cache:
type: memcached
instance_type: cache.m3.medium
memcached_version: 1.4.34
node_count: 1
cache_parameters:
cas_disabled: 1
tags:
mytag: myvalue
Depending on this service¶
The Memcached service outputs the following environment variables:
| Environment Variable | Description |
|---|---|
| <SERVICE_NAME>_ADDRESS | The DNS name of the Memcached configuration endpoint address. |
| <SERVICE_NAME>_PORT | The port on which the Memcached cluster is listening. |
See Environment Variable Names for information about how the service name is included in the environment variable name.
Events produced by this service¶
The Memcached service does not produce events for other Handel services to consume.
Events consumed by this service¶
The Memcached service does not consume events from other Handel services.