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Allow custom initial node taints on worker pool nodes
* 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
This commit is contained in:
Dalton Hubble
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18
CHANGES.md
18
CHANGES.md
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@ -6,6 +6,24 @@ Notable changes between versions.
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* Kubernetes [v1.21.0](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.21.md#v1210)
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### AWS
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* Allow setting custom initial node taints on worker pools ([#968](https://github.com/poseidon/typhoon/pull/968))
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* Add `node_taints` variable to internal `workers` pool module to set initial node taints
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* Add `daemonset_tolerations` so `kube-system` DaemonSets can tolerate custom taints
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### Azure
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* Allow setting custom initial node taints on worker pools ([#968](https://github.com/poseidon/typhoon/pull/968))
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* Add `node_taints` variable to internal `workers` pool module to set initial node taints
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* Add `daemonset_tolerations` so `kube-system` DaemonSets can tolerate custom taints
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### Google Cloud
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* Allow setting custom initial node taints on worker pools ([#968](https://github.com/poseidon/typhoon/pull/968))
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* Add `node_taints` variable to internal `workers` pool module to set initial node taints
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* Add `daemonset_tolerations` so `kube-system` DaemonSets can tolerate custom taints
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### Addons
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* Update kube-state-metrics from v2.0.0-rc.0 to [v2.0.0-rc.1](https://github.com/kubernetes/kube-state-metrics/releases/tag/v2.0.0-rc.1)
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@ -176,4 +176,3 @@ variable "daemonset_tolerations" {
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description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
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default = []
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}
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@ -12,5 +12,6 @@ module "bootstrap" {
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cluster_domain_suffix = var.cluster_domain_suffix
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enable_reporting = var.enable_reporting
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enable_aggregation = var.enable_aggregation
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daemonset_tolerations = var.daemonset_tolerations
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}
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@ -160,3 +160,8 @@ variable "cluster_domain_suffix" {
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default = "cluster.local"
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}
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variable "daemonset_tolerations" {
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type = list(string)
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description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
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default = []
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}
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@ -73,6 +73,9 @@ systemd:
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%{~ for label in split(",", node_labels) ~}
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--node-labels=${label} \
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%{~ endfor ~}
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%{~ for taint in split(",", node_taints) ~}
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--register-with-taints=${taint} \
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%{~ endfor ~}
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--pod-manifest-path=/etc/kubernetes/manifests \
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--provider-id=aws:///$${COREOS_EC2_AVAILABILITY_ZONE}/$${COREOS_EC2_INSTANCE_ID} \
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--read-only-port=0 \
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@ -113,3 +113,9 @@ variable "node_labels" {
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description = "List of initial node labels"
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default = []
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}
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variable "node_taints" {
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type = list(string)
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description = "List of initial node taints"
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default = []
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}
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@ -86,6 +86,7 @@ data "template_file" "worker-config" {
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cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
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cluster_domain_suffix = var.cluster_domain_suffix
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node_labels = join(",", var.node_labels)
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node_taints = join(",", var.node_taints)
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}
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}
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@ -18,6 +18,7 @@ module "bootstrap" {
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cluster_domain_suffix = var.cluster_domain_suffix
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enable_reporting = var.enable_reporting
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enable_aggregation = var.enable_aggregation
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daemonset_tolerations = var.daemonset_tolerations
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# Fedora CoreOS
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trusted_certs_dir = "/etc/pki/tls/certs"
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@ -135,3 +135,8 @@ variable "cluster_domain_suffix" {
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default = "cluster.local"
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}
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variable "daemonset_tolerations" {
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type = list(string)
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description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
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default = []
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}
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@ -67,6 +67,9 @@ systemd:
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%{~ for label in split(",", node_labels) ~}
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--node-labels=${label} \
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%{~ endfor ~}
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%{~ for taint in split(",", node_taints) ~}
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--register-with-taints=${taint} \
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%{~ endfor ~}
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--pod-manifest-path=/etc/kubernetes/manifests \
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--read-only-port=0 \
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--rotate-certificates \
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@ -88,6 +88,12 @@ variable "node_labels" {
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default = []
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}
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variable "node_taints" {
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type = list(string)
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description = "List of initial node taints"
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default = []
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}
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# unofficial, undocumented, unsupported
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variable "cluster_domain_suffix" {
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@ -87,6 +87,7 @@ data "template_file" "worker-config" {
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cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
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cluster_domain_suffix = var.cluster_domain_suffix
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node_labels = join(",", var.node_labels)
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node_taints = join(",", var.node_taints)
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}
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}
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@ -18,5 +18,6 @@ module "bootstrap" {
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cluster_domain_suffix = var.cluster_domain_suffix
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enable_reporting = var.enable_reporting
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enable_aggregation = var.enable_aggregation
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daemonset_tolerations = var.daemonset_tolerations
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}
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@ -141,3 +141,8 @@ variable "cluster_domain_suffix" {
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default = "cluster.local"
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}
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variable "daemonset_tolerations" {
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type = list(string)
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description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
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default = []
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}
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@ -70,6 +70,9 @@ systemd:
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%{~ for label in split(",", node_labels) ~}
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--node-labels=${label} \
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%{~ endfor ~}
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%{~ for taint in split(",", node_taints) ~}
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--register-with-taints=${taint} \
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%{~ endfor ~}
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--pod-manifest-path=/etc/kubernetes/manifests \
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--read-only-port=0 \
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--rotate-certificates \
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@ -94,6 +94,12 @@ variable "node_labels" {
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default = []
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}
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variable "node_taints" {
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type = list(string)
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description = "List of initial node taints"
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default = []
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}
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# unofficial, undocumented, unsupported
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variable "cluster_domain_suffix" {
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@ -105,6 +105,7 @@ data "template_file" "worker-config" {
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cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
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cluster_domain_suffix = var.cluster_domain_suffix
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node_labels = join(",", var.node_labels)
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node_taints = join(",", var.node_taints)
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}
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}
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@ -21,7 +21,7 @@ Create a cluster with ARM64 controller and worker nodes. Container workloads mus
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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=v1.19.4"
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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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@ -47,9 +47,9 @@ 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 v1.19.4 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 v1.19.4 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 v1.19.4 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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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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@ -60,7 +60,7 @@ Create a hybrid/mixed arch cluster by defining an AWS cluster. Then define a [wo
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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=v1.19.4"
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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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@ -83,7 +83,7 @@ Create a hybrid/mixed arch cluster by defining an AWS cluster. Then define a [wo
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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=v1.19.4"
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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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@ -108,9 +108,9 @@ 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 v1.19.4 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 v1.19.4 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 v1.19.4 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 v1.19.4 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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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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@ -0,0 +1,134 @@
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# 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=v1.21.0"
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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=v1.21.0"
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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=v1.21.0"
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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=v1.21.0"
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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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@ -99,6 +99,7 @@ The AWS internal `workers` module supports a number of [variables](https://githu
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| snippets | Fedora CoreOS or Container Linux Config snippets | [] | [examples](/advanced/customization/) |
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| service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
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| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
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| node_taints | List of initial node taints | [] | ["role=gpu:NoSchedule"] |
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|
||||
Check the list of valid [instance types](https://aws.amazon.com/ec2/instance-types/) or per-region and per-type [spot prices](https://aws.amazon.com/ec2/spot/pricing/).
|
||||
|
||||
|
|
@ -194,6 +195,7 @@ The Azure internal `workers` module supports a number of [variables](https://git
|
|||
| snippets | Container Linux Config snippets | [] | [examples](/advanced/customization/) |
|
||||
| service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
|
||||
| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
|
||||
| node_taints | List of initial node taints | [] | ["role=gpu:NoSchedule"] |
|
||||
|
||||
Check the list of valid [machine types](https://azure.microsoft.com/en-us/pricing/details/virtual-machines/linux/) and their [specs](https://docs.microsoft.com/en-us/azure/virtual-machines/linux/sizes-general). Use `az vm list-skus` to get the identifier.
|
||||
|
||||
|
|
@ -297,6 +299,7 @@ Check the list of regions [docs](https://cloud.google.com/compute/docs/regions-z
|
|||
| snippets | Container Linux Config snippets | [] | [examples](/advanced/customization/) |
|
||||
| service_cidr | Must match `service_cidr` of cluster | "10.3.0.0/16" | "10.3.0.0/24" |
|
||||
| node_labels | List of initial node labels | [] | ["worker-pool=foo"] |
|
||||
| node_taints | List of initial node taints | [] | ["role=gpu:NoSchedule"] |
|
||||
|
||||
Check the list of valid [machine types](https://cloud.google.com/compute/docs/machine-types).
|
||||
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@ module "bootstrap" {
|
|||
cluster_domain_suffix = var.cluster_domain_suffix
|
||||
enable_reporting = var.enable_reporting
|
||||
enable_aggregation = var.enable_aggregation
|
||||
daemonset_tolerations = var.daemonset_tolerations
|
||||
|
||||
trusted_certs_dir = "/etc/pki/tls/certs"
|
||||
|
||||
|
|
|
|||
|
|
@ -136,3 +136,8 @@ variable "cluster_domain_suffix" {
|
|||
default = "cluster.local"
|
||||
}
|
||||
|
||||
variable "daemonset_tolerations" {
|
||||
type = list(string)
|
||||
description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
|
||||
default = []
|
||||
}
|
||||
|
|
|
|||
|
|
@ -67,6 +67,9 @@ systemd:
|
|||
%{~ for label in split(",", node_labels) ~}
|
||||
--node-labels=${label} \
|
||||
%{~ endfor ~}
|
||||
%{~ for taint in split(",", node_taints) ~}
|
||||
--register-with-taints=${taint} \
|
||||
%{~ endfor ~}
|
||||
--pod-manifest-path=/etc/kubernetes/manifests \
|
||||
--read-only-port=0 \
|
||||
--rotate-certificates \
|
||||
|
|
|
|||
|
|
@ -90,6 +90,12 @@ variable "node_labels" {
|
|||
default = []
|
||||
}
|
||||
|
||||
variable "node_taints" {
|
||||
type = list(string)
|
||||
description = "List of initial node taints"
|
||||
default = []
|
||||
}
|
||||
|
||||
# unofficial, undocumented, unsupported, temporary
|
||||
|
||||
variable "cluster_domain_suffix" {
|
||||
|
|
|
|||
|
|
@ -89,6 +89,7 @@ data "template_file" "worker-config" {
|
|||
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
|
||||
cluster_domain_suffix = var.cluster_domain_suffix
|
||||
node_labels = join(",", var.node_labels)
|
||||
node_taints = join(",", var.node_taints)
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@ module "bootstrap" {
|
|||
cluster_domain_suffix = var.cluster_domain_suffix
|
||||
enable_reporting = var.enable_reporting
|
||||
enable_aggregation = var.enable_aggregation
|
||||
daemonset_tolerations = var.daemonset_tolerations
|
||||
|
||||
// temporary
|
||||
external_apiserver_port = 443
|
||||
|
|
|
|||
|
|
@ -130,3 +130,8 @@ variable "cluster_domain_suffix" {
|
|||
default = "cluster.local"
|
||||
}
|
||||
|
||||
variable "daemonset_tolerations" {
|
||||
type = list(string)
|
||||
description = "List of additional taint keys kube-system DaemonSets should tolerate (e.g. ['custom-role', 'gpu-role'])"
|
||||
default = []
|
||||
}
|
||||
|
|
|
|||
|
|
@ -70,6 +70,9 @@ systemd:
|
|||
%{~ for label in split(",", node_labels) ~}
|
||||
--node-labels=${label} \
|
||||
%{~ endfor ~}
|
||||
%{~ for taint in split(",", node_taints) ~}
|
||||
--register-with-taints=${taint} \
|
||||
%{~ endfor ~}
|
||||
--pod-manifest-path=/etc/kubernetes/manifests \
|
||||
--read-only-port=0 \
|
||||
--rotate-certificates \
|
||||
|
|
|
|||
|
|
@ -84,6 +84,12 @@ variable "node_labels" {
|
|||
default = []
|
||||
}
|
||||
|
||||
variable "node_taints" {
|
||||
type = list(string)
|
||||
description = "List of initial node taints"
|
||||
default = []
|
||||
}
|
||||
|
||||
# unofficial, undocumented, unsupported, temporary
|
||||
|
||||
variable "cluster_domain_suffix" {
|
||||
|
|
|
|||
|
|
@ -86,6 +86,7 @@ data "template_file" "worker-config" {
|
|||
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
|
||||
cluster_domain_suffix = var.cluster_domain_suffix
|
||||
node_labels = join(",", var.node_labels)
|
||||
node_taints = join(",", var.node_taints)
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -80,6 +80,7 @@ nav:
|
|||
- 'Overview': 'advanced/overview.md'
|
||||
- 'ARM64': 'advanced/arm64.md'
|
||||
- 'Customization': 'advanced/customization.md'
|
||||
- 'Nodes': 'advanced/nodes.md'
|
||||
- 'Worker Pools': 'advanced/worker-pools.md'
|
||||
- 'Addons':
|
||||
- 'Overview': 'addons/overview.md'
|
||||
|
|
|
|||
Loading…
Reference in New Issue