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Amazon ElastiCache
ElastiCache for Memcached User Guide (API Version 2015-02-02)

Rebooting a Cluster

Some changes require that the cluster be rebooted for the changes to be applied. For example, for some parameters, changing the parameter value in a parameter group is only applied after a reboot.

When you reboot a cluster, the cluster flushes all its data and restarts its engine. During this process you cannot access the cluster. Because the cluster flushed all its data, when the cluster is available again, you are starting with an empty cluster.

Rebooting a cluster is currently not supported on Memcached clusters.

You are able to reboot a cluster using the ElastiCache console, the AWS CLI, or the ElastiCache API. Whether you use the ElastiCache console, the AWS CLI or the ElastiCache API, you can only initiate rebooting a single cluster. To reboot multiple clusters you must iterate on the process or operation.

Using the AWS Management Console

You can reboot a cluster using the ElastiCache console.

To reboot a cluster (console)

  1. Sign in to the AWS Management Console and open the ElastiCache console at https://console.aws.amazon.com/elasticache/.

  2. From the list in the upper-right corner, choose the AWS Region you are interested in.

  3. In the navigation pane, choose the engine running on the cluster you want to reboot.

    A list of clusters running the chosen engine will appear.

  4. Choose the cluster to reboot by choosing on the box to the left of the cluster's name.

    The Reboot button will become active.

    If you choose more than one cluster, the Reboot button becomes disabled.

  5. Choose Reboot.

    The reboot cluster confirmation screen appears.

  6. To reboot the cluster, choose Reboot. The status of the cluster will change to rebooting cluster nodes.

    To not reboot the cluster, choose Cancel.

To reboot multiple clusters, repeat steps 2 through 5 for each cluster you want to reboot. You do not need to wait for one cluster to finish rebooting to reboot another.

Using the AWS CLI

To reboot a cluster (AWS CLI), use the reboot-cache-cluster CLI operation.

To reboot specific nodes in the cluster, use the --cache-node-ids-to-reboot to list the specific clusters to reboot. The following command reboots the nodes 0001, 0002, and 0004 of my-cluster.

For Linux, macOS, or Unix:

aws elasticache reboot-cache-cluster \ --cache-cluster-id my-cluster \ --cache-node-ids-to-reboot 0001 0002 0004

For Windows:

aws elasticache reboot-cache-cluster ^ --cache-cluster-id my-cluster ^ --cache-node-ids-to-reboot 0001 0002 0004

To reboot all the nodes in the cluster, use the --cache-node-ids-to-reboot parameter and list all the cluster's node ids. For more information, see reboot-cache-cluster.

Using the ElastiCache API

To reboot a cluster using the ElastiCache API, use the RebootCacheCluster action.

To reboot specific nodes in the cluster, use the CacheNodeIdsToReboot to list the specific clusters to reboot. The following command reboots the nodes 0001, 0002, and 0004 of my-cluster.

https://elasticache.us-west-2.amazonaws.com/ ?Action=RebootCacheCluster &CacheClusterId=my-cluster &CacheNodeIdsToReboot.member.1=0001 &CacheNodeIdsToReboot.member.2=0002 &CacheNodeIdsToReboot.member.3=0004 &Version=2015-02-02 &SignatureVersion=4 &SignatureMethod=HmacSHA256 &Timestamp=20150202T192317Z &X-Amz-Credential=<credential>

To reboot all the nodes in the cluster, use the CacheNodeIdsToReboot parameter and list all the cluster's node ids. For more information, see RebootCacheCluster.