Removing nodes from a cluster

To remove nodes from a cluster (console)

1. Sign in to the Amazon Web Services Management Console and open the ElastiCache console at https://console.amazonaws.cn/elasticache/.

2. From the list in the upper-right corner, choose the Amazon Region of the cluster that you want to remove nodes from.

3. In the navigation pane, choose the engine running on the cluster that you want to remove a node.

   A list of clusters running the chosen engine appears.

4. From the list of clusters, choose the cluster name from which you want to remove a node.

   A list of the cluster's nodes appears.

5. Choose the box to the left of the node ID for the node that you want to remove. Using the ElastiCache console, you can only delete one node at a time, so choosing multiple nodes means that you can't use the Delete node button.

   The Delete Node page appears.

6. To delete the node, complete the Delete Node page and choose Delete Node. To keep the node, choose Cancel.

   Important

   If deleting the node results in the cluster no longer being Multi-AZ compliant, make sure to first clear the Multi-AZ check box and then delete the node. If you clear the Multi-AZ check box, you can choose to enable Auto failover.

1. Identify the IDs of the nodes that you want to remove. For more information, see Viewing a cluster's details.

2. Use the decrease-replica-count CLI operation with a list of the nodes to remove, as in the following example.

   To remove nodes from a cluster using the command-line interface, use the command decrease-replica-count with the following parameters:

   • --replication-group-id The ID of the replication group that you want to remove nodes from.

   • --new-replica-count The --new-replica-count parameter specifies the number of nodes that you want in this cluster after the modification is applied.

   • --replicas-to-remove A list of node IDs that you want removed from this cluster.

   • --apply-immediately or --no-apply-immediately Specifies whether to remove these nodes immediately or at the next maintenance window.

   • --region Specifies the Amazon Region of the cluster that you want to remove nodes from.

   Note

   You can pass only one of --replicas-to-remove or --new-replica-count parameters when calling this operation.

   For Linux, OS X, or Unix:

   aws elasticache decrease-replica-count \
       --replication-group-id my-replication-group \
       --new-replica-count 2 \   
       --region us-east-2 \
       --apply-immediately  

   For Windows:

   aws elasticache decrease-replica-count ^
       --replication-group-id my-replication-group ^
       --new-replica-count 3 ^   
       --region us-east-2 ^
       --apply-immediately  

   This operation produces output similar to the following (JSON format):

   {
       "ReplicationGroup": {
           "ReplicationGroupId": "node-test",
           "Description": "node-test"
          },
           "Status": "modifying",
           "PendingModifiedValues": {},
           "MemberClusters": [
               "node-test-001",
               "node-test-002",
               "node-test-003",
               "node-test-004",
               "node-test-005",
               "node-test-006"
           ],
           "NodeGroups": [
               {
                   "NodeGroupId": "0001",
                   "Status": "modifying",
                   "PrimaryEndpoint": {
                       "Address": "node-test.zzzzzz.ng.0001.usw2.cache.amazonaws.com",
                       "Port": 6379
                   },
                   "ReaderEndpoint": {
                       "Address": "node-test-ro.zzzzzz.ng.0001.usw2.cache.amazonaws.com",
                       "Port": 6379
                   },
                   "NodeGroupMembers": [
                       {
                           "CacheClusterId": "node-test-001",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-001.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2a",
                           "CurrentRole": "primary"
                       },
                       {
                           "CacheClusterId": "node-test-002",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-002.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2c",
                           "CurrentRole": "replica"
                       },
                       {
                           "CacheClusterId": "node-test-003",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-003.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2b",
                           "CurrentRole": "replica"
                       },
                       {
                           "CacheClusterId": "node-test-004",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-004.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2c",
                           "CurrentRole": "replica"
                       },
                       {
                           "CacheClusterId": "node-test-005",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-005.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2b",
                           "CurrentRole": "replica"
                       },
                       {
                           "CacheClusterId": "node-test-006",
                           "CacheNodeId": "0001",
                           "ReadEndpoint": {
                               "Address": "node-test-006.zzzzzz.0001.usw2.cache.amazonaws.com",
                               "Port": 6379
                           },
                           "PreferredAvailabilityZone": "us-west-2b",
                           "CurrentRole": "replica"
                       }
                   ]
               }
           ],
           "SnapshottingClusterId": "node-test-002",
           "AutomaticFailover": "enabled",
           "MultiAZ": "enabled",
           "SnapshotRetentionLimit": 1,
           "SnapshotWindow": "07:30-08:30",
           "ClusterEnabled": false,
           "CacheNodeType": "cache.r5.large",
            "DataTiering": "disabled",
           "TransitEncryptionEnabled": false,
           "AtRestEncryptionEnabled": false,
           "ARN": "arn:aws:elasticache:us-west-2:123456789012:replicationgroup:node-test"
       }
   }