Amazon EMR
Management Guide

Using Amazon EMR Block Public Access

Amazon EMR block public access prevents a cluster from launching when any security group associated with the cluster has a rule that allows inbound traffic from IPv4 or IPv6 ::/0 (public access) on a port, unless the port has been specified as an exception. Port 22 is an exception by default. You can configure exceptions to allow public access on a port or range of ports. In addition, you can enable or disable block public access. We recommend that you enable it.

Block public access is enabled and configured for each AWS Region for your AWS account. In other words, each Region has a block public access configuration that applies to all clusters created by your account in that Region.

Configure Block Public Access

You can enable and disable block public access settings using the AWS Management Console, the AWS CLI, and the Amazon EMR API. Settings apply across your account on a Region-by-Region basis.

To configure block public access using the AWS Management Console
  1. Open the Amazon EMR console at

  2. On the navigation bar, make sure that the Region you want to configure is selected.

  3. Choose Block public access.

  4. Under Block public access settings, complete the following steps.

    To... Do this...

    Turn block public access on or off

    Choose Change, choose On or Off as appropriate, and then choose the check mark to confirm.

    Edit ports in the list of exceptions

    1. Under Exceptions, choose Edit.

    2. To add ports to the list of exceptions, choose Add a port range and enter a new port or port range. Repeat for each port or port range to add.

    3. To remove a port or port range, choose the x next to the entry in the Port ranges list.

    4. Choose Save Changes.

To configure block public access using the AWS CLI

Use the aws emr put-block-public-access-configuration command to configure block public access as shown in the following examples.

To... Do this...

Turn block public access on

Set BlockPublicSecurityGroupRules to true as shown in the following example. For the cluster to launch, no security group associated with a cluster can have an inbound rule that allows public access.

aws emr put-block-public-access-configuration --block-public-access-configuration BlockPublicSecurityGroupRules=true

Turn block public access off

Set BlockPublicSecurityGroupRules to false as shown in the following example. Security groups associated with a cluster can have inbound rules that allow public access on any port. We do not recommend this configuration.

aws emr put-block-public-access-configuration --block-public-access-configuration BlockPublicSecurityGroupRules=false

Turn block public access on and specify ports as exceptions

The following example turns on block public access, and specifies Port 22 and Ports 100-101 as exceptions. This allows clusters to be created if an associated security group has an inbound rule that allows public access on Port 22, Port 100, or Port 101.

aws emr put-block-public-access-configuration --block-public-access-configuration '{ "BlockPublicSecurityGroupRules": true, "PermittedPublicSecurityGroupRuleRanges": [ { "MinRange": 22, "MaxRange": 22 }, { "MinRange": 100, "MaxRange": 101 } ] }'