decrease-replica-count¶

Description¶

Dynamically decreases the number of replicas in a Redis (cluster mode disabled) replication group or the number of replica nodes in one or more node groups (shards) of a Redis (cluster mode enabled) replication group. This operation is performed with no cluster down time.

Synopsis¶

  decrease-replica-count
--replication-group-id <value>
[--new-replica-count <value>]
[--replica-configuration <value>]
[--replicas-to-remove <value>]
--apply-immediately | --no-apply-immediately
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]
[--no-cli-pager]
[--cli-auto-prompt]
[--no-cli-auto-prompt]

Options¶

--replication-group-id (string)

The id of the replication group from which you want to remove replica nodes.

--new-replica-count (integer)

The number of read replica nodes you want at the completion of this operation. For Redis (cluster mode disabled) replication groups, this is the number of replica nodes in the replication group. For Redis (cluster mode enabled) replication groups, this is the number of replica nodes in each of the replication group’s node groups.

The minimum number of replicas in a shard or replication group is:

Redis (cluster mode disabled)

If Multi-AZ is enabled: 1

If Multi-AZ is not enabled: 0

Redis (cluster mode enabled): 0 (though you will not be able to failover to a replica if your primary node fails)

--replica-configuration (list)

A list of ConfigureShard objects that can be used to configure each shard in a Redis (cluster mode enabled) replication group. The ConfigureShard has three members: NewReplicaCount , NodeGroupId , and PreferredAvailabilityZones .

(structure)

Node group (shard) configuration options when adding or removing replicas. Each node group (shard) configuration has the following members: NodeGroupId, NewReplicaCount, and PreferredAvailabilityZones.

NodeGroupId -> (string)

The 4-digit id for the node group you are configuring. For Redis (cluster mode disabled) replication groups, the node group id is always 0001. To find a Redis (cluster mode enabled)’s node group’s (shard’s) id, see Finding a Shard’s Id .

NewReplicaCount -> (integer)

The number of replicas you want in this node group at the end of this operation. The maximum value for NewReplicaCount is 5. The minimum value depends upon the type of Redis replication group you are working with.

The minimum number of replicas in a shard or replication group is:

Redis (cluster mode disabled)

If Multi-AZ: 1

If Multi-AZ: 0

Redis (cluster mode enabled): 0 (though you will not be able to failover to a replica if your primary node fails)

PreferredAvailabilityZones -> (list)

A list of PreferredAvailabilityZone strings that specify which availability zones the replication group’s nodes are to be in. The nummber of PreferredAvailabilityZone values must equal the value of NewReplicaCount plus 1 to account for the primary node. If this member of ReplicaConfiguration is omitted, ElastiCache for Redis selects the availability zone for each of the replicas.

(string)

PreferredOutpostArns -> (list)

The outpost ARNs in which the cache cluster is created.

(string)

Shorthand Syntax:

NodeGroupId=string,NewReplicaCount=integer,PreferredAvailabilityZones=string,string,PreferredOutpostArns=string,string ...

JSON Syntax:

[
  {
    "NodeGroupId": "string",
    "NewReplicaCount": integer,
    "PreferredAvailabilityZones": ["string", ...],
    "PreferredOutpostArns": ["string", ...]
  }
  ...
]

--replicas-to-remove (list)

A list of the node ids to remove from the replication group or node group (shard).

(string)

Syntax:

"string" "string" ...

--apply-immediately | --no-apply-immediately (boolean)

If True , the number of replica nodes is decreased immediately. ApplyImmediately=False is not currently supported.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

Global Options¶

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

json
text
table
yaml
yaml-stream

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

on
off
auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

--cli-binary-format (string)

The formatting style to be used for binary blobs. The default format is base64. The base64 format expects binary blobs to be provided as a base64 encoded string. The raw-in-base64-out format preserves compatibility with AWS CLI V1 behavior and binary values must be passed literally. When providing contents from a file that map to a binary blob fileb:// will always be treated as binary and use the file contents directly regardless of the cli-binary-format setting. When using file:// the file contents will need to properly formatted for the configured cli-binary-format.

base64
raw-in-base64-out

--no-cli-pager (boolean)

Disable cli pager for output.

--cli-auto-prompt (boolean)

Automatically prompt for CLI input parameters.

--no-cli-auto-prompt (boolean)

Disable automatically prompt for CLI input parameters.

Examples¶

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To decrease replica count

The following decrease-replica-count example dynamically decreases the number of replics in a Redis (cluster mode disabled) replication group or the number of replica nodes in one or more node groups (shards) of a Redis (cluster mode enabled) replication group. This operation is performed with no cluster downtime.

aws elasticache decrease-replica-count \
    --replication-group-id my-cluster \
    --apply-immediately  \
    --new-replica-count 2

Output:

{
    "ReplicationGroup": {
        "ReplicationGroupId": "my-cluster",
        "Description": " ",
        "Status": "modifying",
        "PendingModifiedValues": {},
        "MemberClusters": [
            "myrepliace",
            "my-cluster-001",
            "my-cluster-002",
            "my-cluster-003"
        ],
        "NodeGroups": [
            {
                "NodeGroupId": "0001",
                "Status": "modifying",
                "PrimaryEndpoint": {
                    "Address": "my-cluster.xxxxx.ng.0001.usw2.cache.amazonaws.com",
                    "Port": 6379
                },
                "ReaderEndpoint": {
                    "Address": "my-cluster-ro.xxxxx.ng.0001.usw2.cache.amazonaws.com",
                    "Port": 6379
                },
                "NodeGroupMembers": [
                    {
                        "CacheClusterId": "myrepliace",
                        "CacheNodeId": "0001",
                        "ReadEndpoint": {
                            "Address": "myrepliace.xxxxx.0001.usw2.cache.amazonaws.com",
                            "Port": 6379
                        },
                        "PreferredAvailabilityZone": "us-west-2a",
                        "CurrentRole": "replica"
                    },
                    {
                        "CacheClusterId": "my-cluster-001",
                        "CacheNodeId": "0001",
                        "ReadEndpoint": {
                            "Address": "my-cluster-001.xxxxx.0001.usw2.cache.amazonaws.com",
                            "Port": 6379
                        },
                        "PreferredAvailabilityZone": "us-west-2a",
                        "CurrentRole": "primary"
                    },
                    {
                        "CacheClusterId": "my-cluster-002",
                        "CacheNodeId": "0001",
                        "ReadEndpoint": {
                            "Address": "my-cluster-002.xxxxx.0001.usw2.cache.amazonaws.com",
                            "Port": 6379
                        },
                        "PreferredAvailabilityZone": "us-west-2a",
                        "CurrentRole": "replica"
                    },
                    {
                        "CacheClusterId": "my-cluster-003",
                        "CacheNodeId": "0001",
                        "ReadEndpoint": {
                            "Address": "my-cluster-003.xxxxx.0001.usw2.cache.amazonaws.com",
                            "Port": 6379
                        },
                        "PreferredAvailabilityZone": "us-west-2a",
                        "CurrentRole": "replica"
                    }
                ]
            }
        ],
        "AutomaticFailover": "disabled",
        "SnapshotRetentionLimit": 0,
        "SnapshotWindow": "07:30-08:30",
        "ClusterEnabled": false,
        "CacheNodeType": "cache.r5.xlarge",
        "TransitEncryptionEnabled": false,
        "AtRestEncryptionEnabled": false
    }
}

For more information, see Changing the Number of Replicas in the Elasticache User Guide.

Output¶

ReplicationGroup -> (structure)

Contains all of the attributes of a specific Redis replication group.

ReplicationGroupId -> (string)

The identifier for the replication group.

Description -> (string)

The user supplied description of the replication group.

GlobalReplicationGroupInfo -> (structure)

The name of the Global datastore and role of this replication group in the Global datastore.

GlobalReplicationGroupId -> (string)

The name of the Global datastore

GlobalReplicationGroupMemberRole -> (string)

The role of the replication group in a Global datastore. Can be primary or secondary.

Status -> (string)

The current state of this replication group - creating , available , modifying , deleting , create-failed , snapshotting .

PendingModifiedValues -> (structure)

A group of settings to be applied to the replication group, either immediately or during the next maintenance window.

PrimaryClusterId -> (string)

The primary cluster ID that is applied immediately (if --apply-immediately was specified), or during the next maintenance window.

AutomaticFailoverStatus -> (string)

Indicates the status of automatic failover for this Redis replication group.

Resharding -> (structure)

The status of an online resharding operation.

SlotMigration -> (structure)

Represents the progress of an online resharding operation.

ProgressPercentage -> (double)

The percentage of the slot migration that is complete.

AuthTokenStatus -> (string)

The auth token status

UserGroups -> (structure)

The user group being modified.

UserGroupIdsToAdd -> (list)

The ID of the user group to add.

(string)

UserGroupIdsToRemove -> (list)

The ID of the user group to remove.

(string)

LogDeliveryConfigurations -> (list)

The log delivery configurations being modified

(structure)

The log delivery configurations being modified

LogType -> (string)

Refers to slow-log or engine-log..

DestinationType -> (string)

Returns the destination type, either CloudWatch Logs or Kinesis Data Firehose.

DestinationDetails -> (structure)

Configuration details of either a CloudWatch Logs destination or Kinesis Data Firehose destination.

CloudWatchLogsDetails -> (structure)

The configuration details of the CloudWatch Logs destination.

LogGroup -> (string)

The name of the CloudWatch Logs log group.

KinesisFirehoseDetails -> (structure)

The configuration details of the Kinesis Data Firehose destination.

DeliveryStream -> (string)

The name of the Kinesis Data Firehose delivery stream.

LogFormat -> (string)

Returns the log format, either JSON or TEXT

TransitEncryptionEnabled -> (boolean)

A flag that enables in-transit encryption when set to true.

TransitEncryptionMode -> (string)

A setting that allows you to migrate your clients to use in-transit encryption, with no downtime.

MemberClusters -> (list)

The names of all the cache clusters that are part of this replication group.

(string)

NodeGroups -> (list)

A list of node groups in this replication group. For Redis (cluster mode disabled) replication groups, this is a single-element list. For Redis (cluster mode enabled) replication groups, the list contains an entry for each node group (shard).

(structure)

Represents a collection of cache nodes in a replication group. One node in the node group is the read/write primary node. All the other nodes are read-only Replica nodes.

NodeGroupId -> (string)

The identifier for the node group (shard). A Redis (cluster mode disabled) replication group contains only 1 node group; therefore, the node group ID is 0001. A Redis (cluster mode enabled) replication group contains 1 to 90 node groups numbered 0001 to 0090. Optionally, the user can provide the id for a node group.

Status -> (string)

The current state of this replication group - creating , available , modifying , deleting .

PrimaryEndpoint -> (structure)

The endpoint of the primary node in this node group (shard).

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

ReaderEndpoint -> (structure)

The endpoint of the replica nodes in this node group (shard).

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

Slots -> (string)

The keyspace for this node group (shard).

NodeGroupMembers -> (list)

A list containing information about individual nodes within the node group (shard).

(structure)

Represents a single node within a node group (shard).

CacheClusterId -> (string)

The ID of the cluster to which the node belongs.

CacheNodeId -> (string)

The ID of the node within its cluster. A node ID is a numeric identifier (0001, 0002, etc.).

ReadEndpoint -> (structure)

The information required for client programs to connect to a node for read operations. The read endpoint is only applicable on Redis (cluster mode disabled) clusters.

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

PreferredAvailabilityZone -> (string)

The name of the Availability Zone in which the node is located.

PreferredOutpostArn -> (string)

The outpost ARN of the node group member.

CurrentRole -> (string)

The role that is currently assigned to the node - primary or replica . This member is only applicable for Redis (cluster mode disabled) replication groups.

SnapshottingClusterId -> (string)

The cluster ID that is used as the daily snapshot source for the replication group.

AutomaticFailover -> (string)

Indicates the status of automatic failover for this Redis replication group.

MultiAZ -> (string)

A flag indicating if you have Multi-AZ enabled to enhance fault tolerance. For more information, see Minimizing Downtime: Multi-AZ

ConfigurationEndpoint -> (structure)

The configuration endpoint for this replication group. Use the configuration endpoint to connect to this replication group.

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

SnapshotRetentionLimit -> (integer)

The number of days for which ElastiCache retains automatic cluster snapshots before deleting them. For example, if you set SnapshotRetentionLimit to 5, a snapshot that was taken today is retained for 5 days before being deleted.

Warning

If the value of SnapshotRetentionLimit is set to zero (0), backups are turned off.

SnapshotWindow -> (string)

The daily time range (in UTC) during which ElastiCache begins taking a daily snapshot of your node group (shard).

Example: 05:00-09:00

If you do not specify this parameter, ElastiCache automatically chooses an appropriate time range.

Note

This parameter is only valid if the Engine parameter is redis .

ClusterEnabled -> (boolean)

A flag indicating whether or not this replication group is cluster enabled; i.e., whether its data can be partitioned across multiple shards (API/CLI: node groups).

Valid values: true | false

CacheNodeType -> (string)

The name of the compute and memory capacity node type for each node in the replication group.

AuthTokenEnabled -> (boolean)

A flag that enables using an AuthToken (password) when issuing Redis commands.

Default: false

AuthTokenLastModifiedDate -> (timestamp)

The date the auth token was last modified

TransitEncryptionEnabled -> (boolean)

A flag that enables in-transit encryption when set to true .

Required: Only available when creating a replication group in an Amazon VPC using redis version 3.2.6 , 4.x or later.

Default: false

AtRestEncryptionEnabled -> (boolean)

A flag that enables encryption at-rest when set to true .

You cannot modify the value of AtRestEncryptionEnabled after the cluster is created. To enable encryption at-rest on a cluster you must set AtRestEncryptionEnabled to true when you create a cluster.

Required: Only available when creating a replication group in an Amazon VPC using redis version 3.2.6 , 4.x or later.

Default: false

MemberClustersOutpostArns -> (list)

The outpost ARNs of the replication group’s member clusters.

(string)

KmsKeyId -> (string)

The ID of the KMS key used to encrypt the disk in the cluster.

ARN -> (string)

The ARN (Amazon Resource Name) of the replication group.

UserGroupIds -> (list)

The ID of the user group associated to the replication group.

(string)

LogDeliveryConfigurations -> (list)

Returns the destination, format and type of the logs.

(structure)

Returns the destination, format and type of the logs.

LogType -> (string)

Refers to slow-log or engine-log.

DestinationType -> (string)

Returns the destination type, either cloudwatch-logs or kinesis-firehose .

DestinationDetails -> (structure)

Configuration details of either a CloudWatch Logs destination or Kinesis Data Firehose destination.

CloudWatchLogsDetails -> (structure)

The configuration details of the CloudWatch Logs destination.

LogGroup -> (string)

The name of the CloudWatch Logs log group.

KinesisFirehoseDetails -> (structure)

The configuration details of the Kinesis Data Firehose destination.

DeliveryStream -> (string)

The name of the Kinesis Data Firehose delivery stream.

LogFormat -> (string)

Returns the log format, either JSON or TEXT.

Status -> (string)

Returns the log delivery configuration status. Values are one of enabling | disabling | modifying | active | error

Message -> (string)

Returns an error message for the log delivery configuration.

ReplicationGroupCreateTime -> (timestamp)

The date and time when the cluster was created.

DataTiering -> (string)

Enables data tiering. Data tiering is only supported for replication groups using the r6gd node type. This parameter must be set to true when using r6gd nodes. For more information, see Data tiering .

AutoMinorVersionUpgrade -> (boolean)

If you are running Redis engine version 6.0 or later, set this parameter to yes if you want to opt-in to the next auto minor version upgrade campaign. This parameter is disabled for previous versions.

NetworkType -> (string)

Must be either ipv4 | ipv6 | dual_stack . IPv6 is supported for workloads using Redis engine version 6.2 onward or Memcached engine version 1.6.6 on all instances built on the Nitro system .

IpDiscovery -> (string)

The network type you choose when modifying a cluster, either ipv4 | ipv6 . IPv6 is supported for workloads using Redis engine version 6.2 onward or Memcached engine version 1.6.6 on all instances built on the Nitro system .

TransitEncryptionMode -> (string)

A setting that allows you to migrate your clients to use in-transit encryption, with no downtime.

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