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135 lines
4.1 KiB
Markdown
135 lines
4.1 KiB
Markdown
# Nodes
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Typhoon clusters consist of controller node(s) and a (default) set of worker nodes.
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## Overview
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Typhoon nodes use the standard set of Kubernetes node labels.
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```yaml
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Labels: kubernetes.io/arch=amd64
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kubernetes.io/hostname=node-name
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kubernetes.io/os=linux
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```
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Controller node(s) are labeled to allow node selection (for rare components that run on controllers) and tainted to prevent ordinary workloads running on controllers.
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```yaml
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Labels: node.kubernetes.io/controller=true
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Taints: node-role.kubernetes.io/controller:NoSchedule
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```
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Worker nodes are labeled to allow node selection and untainted. Workloads will schedule on worker nodes by default, baring any contraindications.
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```yaml
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Labels: node.kubernetes.io/node=
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Taints: <none>
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```
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On auto-scaling cloud platforms, you may add [worker pools](/advanced/worker-pools/) with different groups of nodes with their own labels and taints. On platforms like bare-metal, with heterogeneous machines, you may manage node labels and taints per node.
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## Node Labels
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Add custom initial worker node labels to default workers or worker pool nodes to allow workloads to select among nodes that differ.
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=== "Cluster"
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```tf
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module "yavin" {
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source = "git::https://github.com/poseidon/typhoon//google-cloud/fedora-coreos/kubernetes?ref=v1.25.4"
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# Google Cloud
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cluster_name = "yavin"
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region = "us-central1"
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dns_zone = "example.com"
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dns_zone_name = "example-zone"
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# configuration
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ssh_authorized_key = local.ssh_key
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# optional
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worker_count = 2
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worker_node_labels = ["pool=default"]
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}
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```
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=== "Worker Pool"
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```tf
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module "yavin-pool" {
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source = "git::https://github.com/poseidon/typhoon//google-cloud/fedora-coreos/kubernetes/workers?ref=v1.25.4"
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# Google Cloud
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cluster_name = "yavin"
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region = "europe-west2"
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network = module.yavin.network_name
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# configuration
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name = "yavin-16x"
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kubeconfig = module.yavin.kubeconfig
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ssh_authorized_key = local.ssh_key
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# optional
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worker_count = 1
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machine_type = "n1-standard-16"
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node_labels = ["pool=big"]
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}
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```
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In the example above, the two default workers would be labeled `pool: default` and the additional worker would be labeled `pool: big`.
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## Node Taints
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Add custom initial taints on worker pool nodes to indicate a node is unique and should only schedule workloads that explicitly tolerate a given taint key.
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!!! warning
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Since taints prevent workloads scheduling onto a node, you must decide whether `kube-system` DaemonSets (e.g. flannel, Calico, Cilium) should tolerate your custom taint by setting `daemonset_tolerations`. If you don't list your custom taint(s), important components won't run on these nodes.
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=== "Cluster"
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```tf
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module "yavin" {
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source = "git::https://github.com/poseidon/typhoon//google-cloud/fedora-coreos/kubernetes?ref=v1.25.4"
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# Google Cloud
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cluster_name = "yavin"
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region = "us-central1"
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dns_zone = "example.com"
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dns_zone_name = "example-zone"
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# configuration
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ssh_authorized_key = local.ssh_key
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# optional
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worker_count = 2
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daemonset_tolerations = ["role"]
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}
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```
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=== "Worker Pool"
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```tf
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module "yavin-pool" {
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source = "git::https://github.com/poseidon/typhoon//google-cloud/fedora-coreos/kubernetes/workers?ref=v1.25.4"
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# Google Cloud
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cluster_name = "yavin"
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region = "europe-west2"
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network = module.yavin.network_name
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# configuration
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name = "yavin-16x"
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kubeconfig = module.yavin.kubeconfig
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ssh_authorized_key = local.ssh_key
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# optional
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worker_count = 1
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accelerator_type = "nvidia-tesla-p100"
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accelerator_count = 1
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node_taints = ["role=gpu:NoSchedule"]
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}
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```
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In the example above, the the additional worker would be tainted with `role=gpu:NoSchedule` to prevent workloads scheduling, but `kube-system` components like flannel, Calico, or Cilium would tolerate that custom taint to run there.
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