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typhoon/docs/advanced/arm64.md

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ARM64

!!! warning ARM64 support is experimental

Typhoon has experimental support for ARM64 with Fedora CoreOS on AWS. Full clusters can be created with ARM64 controller and worker nodes. Or worker pools of ARM64 nodes can be attached to an AMD64 cluster to create a hybrid/mixed architecture cluster.

!!! note Currently, CNI networking must be set to flannel or Cilium.

Cluster

Create a cluster with ARM64 controller and worker nodes. Container workloads must be arm64 compatible and use arm64 container images.

module "gravitas" {
  source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes?ref=v1.22.2"

  # AWS
  cluster_name = "gravitas"
  dns_zone     = "aws.example.com"
  dns_zone_id  = "Z3PAABBCFAKEC0"

  # configuration
  ssh_authorized_key = "ssh-ed25519 AAAAB3Nz..."

  # optional
  arch         = "arm64"
  networking   = "cilium"
  worker_count = 2
  worker_price = "0.0168"

  controller_type = "t4g.small"
  worker_type     = "t4g.small"
}

Verify the cluster has only arm64 (aarch64) nodes.

$ kubectl get nodes -o wide
NAME             STATUS   ROLES    AGE    VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE                          KERNEL-VERSION            CONTAINER-RUNTIME
ip-10-0-12-178   Ready    <none>   101s   v1.22.2   10.0.12.178   <none>        Fedora CoreOS 32.20201104.dev.0   5.8.17-200.fc32.aarch64   docker://19.3.11
ip-10-0-18-93    Ready    <none>   102s   v1.22.2   10.0.18.93    <none>        Fedora CoreOS 32.20201104.dev.0   5.8.17-200.fc32.aarch64   docker://19.3.11
ip-10-0-90-10    Ready    <none>   104s   v1.22.2   10.0.90.10    <none>        Fedora CoreOS 32.20201104.dev.0   5.8.17-200.fc32.aarch64   docker://19.3.11

Hybrid

Create a hybrid/mixed arch cluster by defining an AWS cluster. Then define a worker pool with ARM64 workers. Optional taints are added to aid in scheduling.

=== "Cluster (amd64)"

```tf
module "gravitas" {
  source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes?ref=v1.22.2"

  # AWS
  cluster_name = "gravitas"
  dns_zone     = "aws.example.com"
  dns_zone_id  = "Z3PAABBCFAKEC0"

  # configuration
  ssh_authorized_key = "ssh-ed25519 AAAAB3Nz..."

  # optional
  networking   = "cilium"
  worker_count = 2
  worker_price = "0.021"

  daemonset_tolerations = ["arch"]     # important
}
```

=== "Worker Pool (arm64)"

```tf
module "gravitas-arm64" {
  source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes/workers?ref=v1.22.2"

  # AWS
  vpc_id          = module.gravitas.vpc_id
  subnet_ids      = module.gravitas.subnet_ids
  security_groups = module.gravitas.worker_security_groups

  # configuration
  name               = "gravitas-arm64"
  kubeconfig         = module.gravitas.kubeconfig
  ssh_authorized_key = var.ssh_authorized_key

  # optional
  arch          = "arm64"
  instance_type = "t4g.small"
  spot_price    = "0.0168"
  node_taints   = ["arch=arm64:NoSchedule"]
}
```

Verify amd64 (x86_64) and arm64 (aarch64) nodes are present.

$ kubectl get nodes -o wide
NAME            STATUS   ROLES    AGE     VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE                          KERNEL-VERSION             CONTAINER-RUNTIME
ip-10-0-1-81    Ready    <none>   4m28s   v1.22.2   10.0.1.81     <none>        Fedora CoreOS 34.20210427.3.0     5.11.15-300.fc34.x86_64    docker://20.10.6
ip-10-0-17-86   Ready    <none>   4m28s   v1.22.2   10.0.17.86    <none>        Fedora CoreOS 33.20210413.dev.0   5.10.19-200.fc33.aarch64   docker://19.3.13
ip-10-0-21-45   Ready    <none>   4m28s   v1.22.2   10.0.21.45    <none>        Fedora CoreOS 34.20210427.3.0     5.11.15-300.fc34.x86_64    docker://20.10.6
ip-10-0-40-36   Ready    <none>   4m22s   v1.22.2   10.0.40.36    <none>        Fedora CoreOS 34.20210427.3.0     5.11.15-300.fc34.x86_64    docker://20.10.6