add_volume.ts

import { Ec2TaskDefinition, Scope, ContainerDefinition } from '@aws-cdk/aws-ecs';

// Create TaskDefinition
const taskDefinition = new Ec2TaskDefinition(...);

// Add EBS volume, this will also create the volume 
// Look here to understand all the options:
// https://docs.aws.amazon.com/AmazonECS/latest/developerguide/docker-volumes.html
const VOLUME_NAME = 'my-ebs-volume';
taskDefinition.addVolume({
  name: VOLUME_NAME,
  dockerVolumeConfiguration: {
    autoprovision: true,
    scope: Scope.SHARED,
    driver: 'rexray/ebs',
    driverOpts: {
      volumetype: 'gp2',
      size: '10',
    },
  },
});

// Add your docker container
const myContainer: ContainerDefinition = taskDefinition.addContainer(...);

// Mount the volume to your container
myContainer.addMountPoints({
  sourceVolume: VOLUME_NAME,
  containerPath: '/path/to/mount',
  readOnly: false,
});