@@ -252,9 +258,10 @@ under `MachineOptions`. Below you can see the most common ones.
| `amazonec2-region=eu-central-1` | The region to use when launching the instance. You can omit this entirely and the default `us-east-1` will be used. |
| `amazonec2-vpc-id=vpc-xxxxx` | Your [VPC ID](https://docs.docker.com/machine/drivers/aws/#vpc-id) to launch the instance in. |
| `amazonec2-subnet-id=subnet-xxxx` | The AWS VPC subnet ID. |
| `amazonec2-zone=x` | If not specified, the [availability zone is `a`](https://docs.docker.com/machine/drivers/aws/#environment-variables-and-default-values), it needs to be set to the same availability zone as the specified subnet, for example when the zone is `eu-west-1b` it has to be `amazonec2-zone=b` |
| `amazonec2-use-private-address=true` | Use the private IP address of Docker Machines, but still create a public IP address. Useful to keep the traffic internal and avoid extra costs.|
| `amazonec2-tags=runner-manager-name,gitlab-aws-autoscaler,gitlab,true,gitlab-runner-autoscale,true` | AWS extra tag key-value pairs, useful to identify the instances on the AWS console. The "Name" tag is set to the machine name by default. We set the "runner-manager-name" to match the Runner name set in `[[runners]]`, so that we can filter all the EC2 instances created by a specific manager setup. Read more about [using tags in AWS](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html). |
| `amazonec2-security-group=docker-machine-scaler` | AWS VPC security group name, see [AWS security groups](#aws-security-groups). |
| `amazonec2-security-group=xxxx` | AWS VPC security group name, see [AWS security groups](#aws-security-groups). |
| `amazonec2-instance-type=m4.2xlarge` | The instance type that the child Runners will run on. |