Amazon ParallelCluster using two subnets

In this configuration, only the head node of the cluster is required to have a public IP assigned. You can achieve this by either turning on the "Enable auto-assign public IPv4 address" setting for the subnet used in HeadNode / Networking / SubnetId or by assigning an Elastic IP in HeadNode / Networking / ElasticIp.

If you define a p4d instance type or another instance type that has multiple network interfaces or a network interface card to the head node, you must set HeadNode / Networking / ElasticIp to true to provide public access. Amazon public IPs can only be assigned to instances launched with a single network interface. For more information on IP addresses, see Assign a public IPv4 address during instance launch in the Amazon EC2 User Guide for Linux Instances.

This configuration requires a NAT gateway or an internal proxy in the subnet used for the queues, to give internet access to the compute instances.

The configuration to use an existing private subnet for compute instances requires the following settings:

# Note that all values are only provided as examples
HeadNode:
  ...
  Networking:
    SubnetId: subnet-12345678 # subnet with internet gateway
    #ElasticIp: true | false | eip-12345678
Scheduling:
  Scheduler: slurm
  SlurmQueues:
    - ...
      Networking:
        SubnetIds:
          - subnet-23456789 # subnet with NAT gateway
        #AssignPublicIp: false