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084e8bea49
* Add `node_taints` variable to worker modules to set custom initial node taints on cloud platforms that support auto-scaling worker pools of heterogeneous nodes (i.e. AWS, Azure, GCP) * Worker pools could use custom `node_labels` to allowed workloads to select among differentiated nodes, while custom `node_taints` allows a worker pool's nodes to be tainted as special to prevent scheduling, except by workloads that explicitly tolerate the taint * Expose `daemonset_tolerations` in AWS, Azure, and GCP kubernetes cluster modules, to determine whether `kube-system` components should tolerate the custom taint (advanced use covered in docs) Rel: #550, #663 Closes #429
117 lines
4.3 KiB
Markdown
117 lines
4.3 KiB
Markdown
# ARM64
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!!! warning
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ARM64 support is experimental
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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.
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!!! note
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Currently, CNI networking must be set to flannel.
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## AMIs
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In lieu of official Fedora CoreOS ARM64 AMIs, Poseidon publishes experimental ARM64 AMIs to a few regions (us-east-1, us-east-2, us-west-1). These AMIs may be **removed** at any time and will be replaced when Fedora CoreOS publishes equivalents.
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!!! note
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AMIs are only published to a few regions, and AWS availability of ARM instance types varies.
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## Cluster
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Create a cluster with ARM64 controller and worker nodes. Container workloads must be `arm64` compatible and use `arm64` container images.
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```tf
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module "gravitas" {
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source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes?ref=v1.21.0"
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# AWS
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cluster_name = "gravitas"
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dns_zone = "aws.example.com"
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dns_zone_id = "Z3PAABBCFAKEC0"
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# configuration
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ssh_authorized_key = "ssh-rsa AAAAB3Nz..."
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# optional
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arch = "arm64"
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networking = "flannel"
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worker_count = 2
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worker_price = "0.0168"
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controller_type = "t4g.small"
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worker_type = "t4g.small"
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}
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```
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Verify the cluster has only arm64 (`aarch64`) nodes.
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```
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$ kubectl get nodes -o wide
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NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
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ip-10-0-12-178 Ready <none> 101s v1.21.0 10.0.12.178 <none> Fedora CoreOS 32.20201104.dev.0 5.8.17-200.fc32.aarch64 docker://19.3.11
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ip-10-0-18-93 Ready <none> 102s v1.21.0 10.0.18.93 <none> Fedora CoreOS 32.20201104.dev.0 5.8.17-200.fc32.aarch64 docker://19.3.11
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ip-10-0-90-10 Ready <none> 104s v1.21.0 10.0.90.10 <none> Fedora CoreOS 32.20201104.dev.0 5.8.17-200.fc32.aarch64 docker://19.3.11
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```
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## Hybrid
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Create a hybrid/mixed arch cluster by defining an AWS cluster. Then define a [worker pool](worker-pools.md#aws) with ARM64 workers. Optional taints are added to aid in scheduling.
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=== "Cluster (amd64)"
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```tf
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module "gravitas" {
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source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes?ref=v1.21.0"
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# AWS
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cluster_name = "gravitas"
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dns_zone = "aws.example.com"
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dns_zone_id = "Z3PAABBCFAKEC0"
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# configuration
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ssh_authorized_key = "ssh-rsa AAAAB3Nz..."
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# optional
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networking = "flannel"
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worker_count = 2
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worker_price = "0.021"
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daemonset_tolerations = ["arch"] # important
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}
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```
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=== "Worker Pool (arm64)"
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```tf
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module "gravitas-arm64" {
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source = "git::https://github.com/poseidon/typhoon//aws/fedora-coreos/kubernetes/workers?ref=v1.21.0"
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# AWS
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vpc_id = module.gravitas.vpc_id
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subnet_ids = module.gravitas.subnet_ids
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security_groups = module.gravitas.worker_security_groups
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# configuration
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name = "gravitas-arm64"
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kubeconfig = module.gravitas.kubeconfig
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ssh_authorized_key = var.ssh_authorized_key
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# optional
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arch = "arm64"
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instance_type = "t4g.small"
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spot_price = "0.0168"
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node_taints = ["arch=arm64:NoSchedule"]
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}
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```
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Verify amd64 (x86_64) and arm64 (aarch64) nodes are present.
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```
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$ kubectl get nodes -o wide
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NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
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ip-10-0-14-73 Ready <none> 116s v1.21.0 10.0.14.73 <none> Fedora CoreOS 32.20201018.3.0 5.8.15-201.fc32.x86_64 docker://19.3.11
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ip-10-0-17-167 Ready <none> 104s v1.21.0 10.0.17.167 <none> Fedora CoreOS 32.20201018.3.0 5.8.15-201.fc32.x86_64 docker://19.3.11
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ip-10-0-47-166 Ready <none> 110s v1.21.0 10.0.47.166 <none> Fedora CoreOS 32.20201104.dev.0 5.8.17-200.fc32.aarch64 docker://19.3.11
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ip-10-0-7-237 Ready <none> 111s v1.21.0 10.0.7.237 <none> Fedora CoreOS 32.20201018.3.0 5.8.15-201.fc32.x86_64 docker://19.3.11
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```
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