ElastiCache operations

Category	✅ Supported	❌ Unsupported
General	22	2

Operation	Status	Notes	AWS Docs
AddTagsToResource	✅ Supported	ARN-scoped tag storage	docs
CreateCacheCluster	✅ Supported	Docker-backed (redis/valkey/memcached); async creating→available once the engine answers PING; a cache that never answers ends in incompatible-network; port auto-alloc. CacheClusterId is validated to AWS’s 1–50 letter-led grammar and stored lowercase; NumCacheNodes is bounded per engine (1 for redis/valkey, 1–40 for memcached); AZMode and PreferredAvailabilityZones are memcached-only and the zone list must match the node count; ReplicationGroupId must name an existing group and adds the cluster to it. The response carries CacheNodes, CacheClusterCreateTime and the nested CacheParameterGroup, and ConfigurationEndpoint only for memcached, as AWS does. The CloudFormation resource’s Port, VpcSecurityGroupIds, TransitEncryptionEnabled, SnapshotRetentionLimit, NotificationTopicArn, PreferredMaintenanceWindow, AutoMinorVersionUpgrade and LogDeliveryConfigurations are not modeled	docs
CreateCacheParameterGroup	✅ Supported	Stores name, family, description, and ARN	docs
CreateCacheSubnetGroup	✅ Supported	Stores name, description, and subnet IDs	docs
CreateReplicationGroup	✅ Supported	Docker-backed (single primary node); async creating→available once the primary answers PING; a group that never answers ends in create-failed; CacheSubnetGroupName places the group in that subnet group’s VPC. ReplicationGroupId is validated to AWS’s 1–40 letter-led grammar and stored lowercase, and Engine must be redis or valkey — memcached does not replicate. Engine/EngineVersion pick the container image; SnapshotRetentionLimit and PrimaryClusterId round-trip from Create, and a group with no PrimaryClusterId names its primary <group>-001 as AWS does. The response carries one NodeGroup with PrimaryEndpoint/ReaderEndpoint/NodeGroupMembers, ClusterEnabled false and ReplicationGroupCreateTime; ConfigurationEndpoint stays null, as AWS leaves it for a cluster-mode-disabled group. The CloudFormation resource’s NumCacheClusters, NumNodeGroups, ReplicasPerNodeGroup, CacheParameterGroupName, AtRestEncryptionEnabled, TransitEncryptionEnabled, AuthToken, KmsKeyId, UserGroupIds, CacheSecurityGroupNames, LogDeliveryConfigurations, Tags, NotificationTopicArn, PreferredMaintenanceWindow, SnapshotWindow and SecurityGroupIds are not modeled	docs
CreateServerlessCache	✅ Supported	Docker-backed (redis/valkey/memcached); async creating→available once the engine answers PING; a cache that never answers ends in create-failed; CloudFormation ServerlessCache supported	docs
DeleteCacheCluster	✅ Supported	Sets status to “deleting”; stops and removes Docker container asynchronously	docs
DeleteCacheParameterGroup	✅ Supported	Removes stored parameter group	docs
DeleteCacheSubnetGroup	✅ Supported	Removes stored subnet group	docs
DeleteReplicationGroup	✅ Supported	Sets status to “deleting”; stops and removes Docker container asynchronously	docs
DeleteServerlessCache	✅ Supported	Sets status to “deleting”; stops and removes Docker container asynchronously	docs
DescribeCacheClusters	✅ Supported	List all or filter by CacheClusterId	docs
DescribeCacheEngineVersions	❌ Unsupported	stub; returns 501	docs
DescribeCacheParameterGroups	✅ Supported	List all or filter by name	docs
DescribeCacheParameters	✅ Supported	Returns curated static parameters for the group’s family; supports Source filter and MaxRecords/Marker pagination	docs
DescribeCacheSubnetGroups	✅ Supported	List all or filter by name	docs
DescribeReplicationGroups	✅ Supported	List all or filter by ReplicationGroupId	docs
DescribeServerlessCaches	✅ Supported	List all or filter by ServerlessCacheName	docs
ListTagsForResource	✅ Supported	Returns all tags for an ARN	docs
ModifyCacheCluster	✅ Supported	Metadata-only; updates nodeType, engineVersion, numNodes, parameterGroup; modifying→available	docs
ModifyReplicationGroup	✅ Supported	Metadata-only; updates description, nodeType, failover, multiAZ; modifying→available	docs
ModifyServerlessCache	✅ Supported	Metadata-only; updates description, engine/version, usage limits, security groups, snapshots, and user group; modifying→available	docs
RebootCacheCluster	❌ Unsupported	stub; returns 501	docs
RemoveTagsFromResource	✅ Supported	Removes specific tag keys	docs