When trying to launch a RedShift cluster in AWS I found I was only able to select the default VPC - unfortunately not the VPC that my Production workloads were running in.
In order to allow the creation of RedShift clusters in VPCs other than your default you need to create a new Cluster Subnet Group. To do this follow the steps below;
1. Login to AWS console and select RedShift
2. In the RedShift console go to "Security" and select "Subnet Groups" from the tabs at the top
3. Click "Create Cluster Subnet Group"
4. Give the group a name and description and pick the VPC you want to run the Cluster in. Then choose your Subnet IDs from the Availability Zones available.
5. Click "Create". Now when you try to launch a RedShift cluster you will be able to choose the VPC you want to run the Cluster in, and your newly created Subnet Group.
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