Security

Private cluster subnets

By default, instances are created in public subnets and are assigned public IP addresses. You can configure all instances in your cluster to use private subnets by setting subnet_visibility: private in your cluster configuration file before creating your cluster. If private subnets are used, instances will not have public IP addresses, and Cortex will create a NAT gateway to allow outgoing network requests.

Private APIs

See networking for a discussion of API visibility.

Private operator

By default, the Cortex cluster operator's load balancer is internet-facing, and therefore publicly accessible (the operator is what the cortex CLI connects to). The operator's load balancer can be configured to be private by setting operator_load_balancer_scheme: internal in your cluster configuration file. If you do this, you will need to configure VPC Peering to allow your CLI to connect to the Cortex operator (this will be necessary to run any cortex commands).