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Remediation

It is recommended to transition from Launch Configurations to Launch Templates rather than modifying the existing launch configuration. The migration process to launch templates is outlined in /ce/ca/aws/autoscaling/group-uses-launch-configuration.

If immediate migration is not feasible, you may choose to modify the current launch configuration as outlined below.

From Command Line​

Create a New Launch Configuration​

Launch configurations cannot be modified once created. To update the launch configuration for an Auto Scaling group, you must create a new launch configuration based on the existing one.

Optionally, you can retrieve the settings of the current launch configuration using the following command:

aws autoscaling describe-launch-configurations \
    --launch-configuration-names {{existing-launch-configuration-name}}

Once you have the configuration details, create a new launch configuration using the create-launch-configuration command. Set the --associate-public-ip-address parameter to true in the new configuration:

aws autoscaling create-launch-configuration \
    --launch-configuration-name {{new-launch-configuration-name}} \
    --image-id {{image-id}} \
    --instance-type {{instance-type}} \
    --associate-public-ip-address true

Update the Auto Scaling Group to Use the New Launch Configuration​

After creating the new launch configuration, update the associated Auto Scaling group to use it:

aws autoscaling update-auto-scaling-group \
    --auto-scaling-group-name {{auto-scaling-group-name}} \
    --launch-configuration-name {{new-launch-configuration-name}}