Modifying an ElastiCache parameter group - Amazon ElastiCache
Modifying a parameter group (Console)Modifying a parameter group (AWS CLI)Modifying a parameter group (ElastiCache API)

Modifying an ElastiCache parameter group

Important

You cannot modify any default parameter group.

You can modify some parameter values in a parameter group. These parameter values are applied to clusters associated with the parameter group. For more information on when a parameter value change is applied to a parameter group, see Valkey and Redis OSS parameters and Memcached specific parameters.

Modifying a parameter group (Console)

The following procedure shows how to change the cluster-enabled parameter's value using the ElastiCache console. You would use the same procedure to change the value of any parameter.

To change a parameter's value using the ElastiCache console

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

  2. To see a list of all available parameter groups, in the left hand navigation pane choose Parameter Groups.

  3. Choose the parameter group you want to modify by choosing the box to the left of the parameter group's name.

    The parameter group's parameters will be listed at the bottom of the screen. You may need to page through the list to see all the parameters.

  4. To modify one or more parameters, choose Edit Parameters.

  5. In the Edit Parameter Group: screen, scroll using the left and right arrows until you find the binding_protocol parameter, then type ascii in the Value column.

  6. Choose Save Changes.

  7. For Memcached, to find the name of the parameter you changed, see Memcached specific parameters. If changes to the parameter take place After restart, reboot every cluster that uses this parameter group. For more information, see Rebooting clusters.

  8. With Valkey and Redis OSS, to find the name of the parameter you changed, see Valkey and Redis OSS parameters. If you have a Valkey or Redis OSS (cluster mode disabled) cluster and make changes to the following parameters, you must reboot the nodes in the cluster:

    • activerehashing

    • databases

    For more information, see Rebooting nodes.

    Valkey or Redis OSS (Cluster Mode Enabled) parameter changes

    If you make changes to the following parameters on a Valkey or Redis OSS (cluster mode enabled) cluster, follow the ensuing steps.

    • activerehashing

    • databases

    1. With Redis OSS, you can reate a manual backup of your cluster. See Taking manual backups.

    2. Delete the cluster. See Deleting clusters.

    3. Restore the cluster using the altered parameter group and backup to seed the new cluster. See Restoring from a backup into a new cache.

    Changes to other parameters do not require this.

Modifying a parameter group (AWS CLI)

To change a parameter's value using the AWS CLI, use the command modify-cache-parameter-group.

With Memcached, to find the name and permitted values of the parameter you want to change, see Memcached specific parameters

The following sample code sets the value of two parameters, chunk_size and chunk_size_growth_fact on the parameter group myMem14.

For Linux, macOS, or Unix:

aws elasticache modify-cache-parameter-group \
    --cache-parameter-group-name myMem14 \
    --parameter-name-values \
        ParameterName=chunk_size,ParameterValue=96 \
        ParameterName=chunk_size_growth_fact,ParameterValue=1.5

For Windows:

aws elasticache modify-cache-parameter-group ^
    --cache-parameter-group-name myMem14 ^
    --parameter-name-values ^
        ParameterName=chunk_size,ParameterValue=96 ^
        ParameterName=chunk_size_growth_fact,ParameterValue=1.5

Output from this command will look something like this.

{
    "CacheParameterGroupName": "myMem14"
}

With Valkey and Redis OSS, to find the name and permitted values of the parameter you want to change, see Valkey and Redis OSS parameters

The following sample code sets the value of two parameters, reserved-memory-percent and cluster-enabled on the parameter group myredis32-on-30. We set reserved-memory-percent to 30 (30 percent) and cluster-enabled to yes so that the parameter group can be used with Valkey or Redis OSS (cluster mode enabled) clusters (replication groups).

For Linux, macOS, or Unix:

aws elasticache modify-cache-parameter-group \
    --cache-parameter-group-name myredis32-on-30 \
    --parameter-name-values \
        ParameterName=reserved-memory-percent,ParameterValue=30 \
        ParameterName=cluster-enabled,ParameterValue=yes

For Windows:

aws elasticache modify-cache-parameter-group ^
    --cache-parameter-group-name myredis32-on-30 ^
    --parameter-name-values ^
        ParameterName=reserved-memory-percent,ParameterValue=30 ^
        ParameterName=cluster-enabled,ParameterValue=yes

Output from this command will look something like this.

{
    "CacheParameterGroupName": "my-redis32-on-30"
}

For more information, see modify-cache-parameter-group.

To find the name of the parameter you changed, see Valkey and Redis OSS parameters.

If you have a Valkey or Redis OSS (cluster mode disabled) cluster and make changes to the following parameters, you must reboot the nodes in the cluster:

  • activerehashing

  • databases

For more information, see Rebooting nodes.

Valkey or Redis OSS (Cluster Mode Enabled) parameter changes

If you make changes to the following parameters on a Valkey or Redis OSS (cluster mode enabled) cluster, follow the ensuing steps.

  • activerehashing

  • databases

  1. Create a manual backup of your cluster. See Taking manual backups.

  2. Delete the cluster. See Deleting clusters.

  3. Restore the cluster using the altered parameter group and backup to seed the new cluster. See Restoring from a backup into a new cache.

Changes to other parameters do not require this.

Modifying a parameter group (ElastiCache API)

To change a parameter group's parameter values using the ElastiCache API, use the ModifyCacheParameterGroup action.

With Memcached, to find the name and permitted values of the parameter you want to change, see Memcached specific parameters

The following sample code sets the value of two parameters, chunk_size and chunk_size_growth_fact on the parameter group myMem14.

https://elasticache.us-west-2.amazonaws.com/
   ?Action=ModifyCacheParameterGroup
   &CacheParameterGroupName=myMem14
   &ParameterNameValues.member.1.ParameterName=chunk_size
   &ParameterNameValues.member.1.ParameterValue=96
   &ParameterNameValues.member.2.ParameterName=chunk_size_growth_fact
   &ParameterNameValues.member.2.ParameterValue=1.5
   &SignatureVersion=4
   &SignatureMethod=HmacSHA256
   &Timestamp=20150202T192317Z
   &Version=2015-02-02
   &X-Amz-Credential=<credential>

With Valkey and Redis OSS, to find the name and permitted values of the parameter you want to change, see Valkey and Redis OSS parameters

The following sample code sets the value of two parameters, reserved-memory-percent and cluster-enabled on the parameter group myredis32-on-30. We set reserved-memory-percent to 30 (30 percent) and cluster-enabled to yes so that the parameter group can be used with Valkey or Redis OSS (cluster mode enabled) clusters (replication groups).

https://elasticache.us-west-2.amazonaws.com/
   ?Action=ModifyCacheParameterGroup
   &CacheParameterGroupName=myredis32-on-30
   &ParameterNameValues.member.1.ParameterName=reserved-memory-percent
   &ParameterNameValues.member.1.ParameterValue=30
   &ParameterNameValues.member.2.ParameterName=cluster-enabled
   &ParameterNameValues.member.2.ParameterValue=yes
   &SignatureVersion=4
   &SignatureMethod=HmacSHA256
   &Timestamp=20150202T192317Z
   &Version=2015-02-02
   &X-Amz-Credential=<credential>

For more information, see ModifyCacheParameterGroup.

If you have a Valkey or Redis OSS (cluster mode disabled) cluster and make changes to the following parameters, you must reboot the nodes in the cluster:

  • activerehashing

  • databases

For more information, see Rebooting nodes.

Valkey or Redis OSS (Cluster Mode Enabled) parameter changes

If you make changes to the following parameters on a Valkey or Redis OSS (cluster mode enabled) cluster, follow the ensuing steps.

  • activerehashing

  • databases

  1. Create a manual backup of your cluster. See Taking manual backups.

  2. Delete the cluster. See Deleting a cluster in ElastiCache.

  3. Restore the cluster using the altered parameter group and backup to seed the new cluster. See Restoring from a backup into a new cache.

Changes to other parameters do not require this.