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

Modifying a 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 Memcached Specific Parameters.

Modifying a Parameter Group (Console)

The following procedure shows how to change the binding_protocol 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. 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 a Cluster.

Modifying a Parameter Group (AWS CLI)

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

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" }

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

If changes to the parameter take place After restart, reboot every cluster that uses this parameter group. For more information, see Rebooting a Cluster.

Modifying a Parameter Group (ElastiCache API)

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

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>

For more information, see ModifyCacheParameterGroup.

After updating and saving the parameter, if the change to the parameter take place After restart, reboot every cluster that uses this parameter group. For more information, see Rebooting a Cluster.