Edit the vpc-infra-parmas.json to customize the parameters for your VPC and database.
Run the following command to create the VPC and Database
aws cloudformation create-stack --stack-name ocp-vpc-infra --template-body file://vpc-infra.yaml --parameters file://vpc-infra-params.json
Download an make sure OpenShift installer probram openshift-install.
Create a directory to host the OpenShift configuration files.
Copy the install-config.yaml.sample file into the folder and rename it install-config.yaml
Modify the install-config-yaml file. Set the pull secret and vpc subnet created above.
Run the following command to create your cluster.
openshift-install create cluster --dir ocppam