AWS CDK How to override default launch configuration in auto scaling group?

Question

Hi I am working on AWS CDK. I am creating ECS. I have created auto scaling group as below.

autoScallingGroup=asg.AutoScalingGroup(self, id = "auto scalling", vpc= vpc, machine_image=ecs.EcsOptimizedImage.amazon_linux(), desired_capacity=1, key_name="mws-location", max_capacity=1, min_capacity=1, instance_type=ec2.InstanceType("t2.xlarge"))

This will generate default launch configuration also. I want to write my own launch configuration for this auto scaling group.

Can someone help me to fix this? Any help would be appreciated. Thanks

Answer 1

There is no specific construct to create a launch configuration in CDK. However, you can construct one by passing in arguments to aws_autoscaling.AutoScalingGroup constructor.

You need to specifiy the following attributes of AutoScalingGroup class:

• role
• instance_type
• key_name
• machine_image
• user_data
• associate_public_ip_address
• block_devices

You can also add security groups using the add_security_group() function.

For example, if you want to add user data to the LaunchConfig:

userdata = ec2.UserData.for_linux(shebang="#!/bin/bash -xe")
userdata.add_commands(
         "echo '======================================================='",
         "echo \"ECS_CLUSTER=${MWSServiceCluster}\" >> /etc/ecs/ecs.config"
)

asg = autoscaling.AutoScalingGroup(
        self,
        "asg-identifier",
        ...
        user_data=userdata,
)