Create Arm NodePools on AWS HostedClusters

The arch field was added to the NodePool Spec in OCP 4.14. The arch field sets the required processor architecture for the NodePool (currently only supported on AWS).

Note

Currently, the only valid values for '--arch' are 'arm64' and 'amd64'. The HyperShift CLI will default to 'amd64' when the 'arch' field is not specified by the user.

Creating Arm NodePools Through the API

The HostedCluster custom resource (CR) must utilize a multi-arch manifested image. Multi-arch nightly images can be found at https://multi.ocp.releases.ci.openshift.org/.

Here is an example of an OCP 4.14 multi-arch nightly image:

% oc image info quay.io/openshift-release-dev/ocp-release-nightly@sha256:9b992c71f77501678c091e3dc77c7be066816562efe3d352be18128b8e8fce94 -a ~/pull-secrets.json

error: the image is a manifest list and contains multiple images - use --filter-by-os to select from:

  OS            DIGEST
  linux/amd64   sha256:c9dc4d07788ebc384a3d399a0e17f80b62a282b2513062a13ea702a811794a60
  linux/ppc64le sha256:c59c99d6ff1fe7b85790e24166cfc448a3c2ac3ef3422fce3c7259e48d2c9aab
  linux/s390x   sha256:07fcd16d5bee95196479b1e6b5b3b8064dd5359dac75e3d81f0bd4be6b8fe208
  linux/arm64   sha256:1d93a6beccc83e2a4c56ecfc37e921fe73d8964247c1a3ec34c4d66f175d9b3d

The CPU architecture for a NodePool is specified through its CR spec: spec.arch. Here is an example:

apiVersion: hypershift.openshift.io/v1beta1
kind: NodePool
metadata:
  creationTimestamp: null
  name: hypershift-arm-us-east-1a
  namespace: clusters
spec:
  arch: arm64
  clusterName: hypershift-arm
  management:
    autoRepair: false
    upgradeType: Replace
  nodeDrainTimeout: 0s
  platform:
    aws:
      instanceProfile: hypershift-arm-2m289-worker
      instanceType: m6g.large
      rootVolume:
        size: 120
        type: gp3
      securityGroups:
      - id: sg-064ea63968d258493
      subnet:
        id: subnet-02c74cf1cf1e7413f
    type: AWS
  release:
    image: quay.io/openshift-release-dev/ocp-release-nightly@sha256:390a33cebc940912a201a35ca03927ae5b058fbdae9626f7f4679786cab4fb1c
  replicas: 3
status:
  replicas: 0

Creating a HostedCluster with Arm NodePool Through HyperShift CLI

Create a new cluster, specifying the RELEASE_IMAGE and ARCH:

REGION=us-east-1
CLUSTER_NAME=example
BASE_DOMAIN=example.com
AWS_CREDS="$HOME/.aws/credentials"
PULL_SECRET="$HOME/pull-secret"
RELEASE_IMAGE="quay.io/openshift-release-dev/ocp-release-nightly@sha256:390a33cebc940912a201a35ca03927ae5b058fbdae9626f7f4679786cab4fb1c"
ARCH="arm64"

hypershift create cluster aws \
--name $CLUSTER_NAME \
--node-pool-replicas=3 \
--base-domain $BASE_DOMAIN \
--pull-secret $PULL_SECRET \
--aws-creds $AWS_CREDS \
--region $REGION \
--release-image $RELEASE_IMAGE \
--arch $ARCH \
--generate-ssh

The HostedCluster will spin up with an Arm NodePool. The default AWS Arm instance type is m6g.large.

Creating Arm NodePools on Existing HostedClusters Through HyperShift CLI

As long as a HostedCluster was created with a manifest listed image in the --release-image, Arm NodePools can be added to the HostedCluster:

CLUSTER_NAME=example
NODE_POOLNAME=example-worker
ARCH="arm64"

hypershift create nodepool aws \
--cluster-name $CLUSTER_NAME \
--name $NODE_POOLNAME \
--node-count=3 \
--arch $ARCH \