Image section - Amazon ParallelCluster
Image properties
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Image section

(Required) Defines the operating system for the cluster.

Image:
  Os: string
  CustomAmi: string

Image properties

Os (Required, String)

Specifies the operating system to use for the cluster. The supported values are alinux2, centos7, ubuntu2204, ubuntu2004, rhel8,rocky8,rhel9,rocky9.

Note

RedHat Enterprise Linux 8.7 (rhel8) is added starting in Amazon ParallelCluster version 3.6.0.

If you configure your cluster to use rhel, the on-demand cost for any instance type is higher than when you configure your cluster to use other supported operation systems. For more information about pricing, see On-Demand Pricing and How is Red Hat Enterprise Linux on Amazon EC2 offered and priced?.

RedHat Enterprise Linux 9 (rhel9) is added starting in Amazon ParallelCluster version 3.9.0.

Other than the specific Amazon Web Services Regions mentioned in the following table that don't support centos7. All other Amazon commercial Regions support all of the following operating systems.

Partition (Amazon Web Services Regions) alinux2 centos7 ubuntu2204 and ubuntu2004 rhel8 rhel9
Commercial (All Amazon Web Services Regions not specifically mentioned) True True True True True
Amazon GovCloud (US-East) (us-gov-east-1) True False True True True
Amazon GovCloud (US-West) (us-gov-west-1) True False True True True
China (Beijing) (cn-north-1) True False True True True
China (Ningxia) (cn-northwest-1) True False True True True

Update policy: If this setting is changed, the update is not allowed.

Note

Amazon ParallelCluster 3.8.0 supports Rocky Linux 8, but pre-built Rocky Linux 8 AMIs (for x86 and ARM architectures) are not available. Amazon ParallelCluster 3.8.0 supports creating clusters with Rocky Linux 8 using custom AMIs. For more information refer to Operating System Consideratoins. Amazon ParallelCluster 3.9.0 supports Rocky Linux 9, but pre-built Rocky Linux 9 AMIs (for x86 and ARM architectures) are not available. Amazon ParallelCluster 3.9.0 supports creating clusters with Rocky Linux 9 using custom AMIs. For more information refer to Operating System Consideratoins.

CustomAmi (Optional, String)

Specifies the ID of a custom AMI to use for the head and compute nodes instead of the default AMI. For more information, see Amazon ParallelCluster AMI customization.

If the custom AMI requires additional permissions for its launch, these permissions must be added to both the user and head node policies.

For example, if a custom AMI has an encrypted snapshot associated with it, the following additional policies are required in both the user and head node policies:

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Effect": "Allow",
           "Action": [
               "kms:DescribeKey",
               "kms:ReEncrypt*",
               "kms:CreateGrant",
               "kms:Decrypt"
           ],
           "Resource": [
               "arn:aws:kms:<AWS_REGION>:<AWS_ACCOUNT_ID>:key/<AWS_KMS_KEY_ID>"
           ]                                                    
       }
   ]
}

To build a RedHat Enterprise Linux custom AMI, you must configure the OS for installing the packages that are provided by the RHUI (Amazon) repositories: rhel-<version>-baseos-rhui-rpms, rhel-<version>-appstream-rhui-rpms, and codeready-builder-for-rhel-<version>-rhui-rpms. Moreover, the repositories on the custom AMI must contain kernel-devel packages on the same version as the running kernel version. kernel.

Known limitations:

  • Only RHEL 8.2 and later versions support FSx for Lustre.

  • RHEL 8.7 kernel version 4.18.0-425.3.1.el8 doesn't support FSx for Lustre.

  • Only RHEL 8.4 and later versions support EFA.

To troubleshoot custom AMI validation warnings, see Troubleshooting custom AMI issues.

Update policy: If this setting is changed, the update is not allowed.