Taint
A Kubernetes taint is a node attribute that repels Pods lacking a matching toleration according to the taint’s effect.
Google Anthos in Action
A Kubernetes node taint is a key-value restriction on a node that repels pods lacking a matching toleration.
- How it is used
- Reserves nodes for eligible workloads by repelling Pods without matching tolerations.
- How deep it goes
- Explains effects and matching tolerations through commands and a Pod manifest, without detailing scheduler internals.
- Examples
- Uses a three-zone GKE cluster, a GPU-node taint, a matching NGINX Pod toleration, and placement output.
- What you can do after
- Operate/configure it with kubectl to reserve nodes and configure Pods that can run on them.
Acing the Certified Kubernetes Administrator Exam, Second Edition
A taint is a Kubernetes node attribute that repels pods from being scheduled on the node unless their specifications include a matching toleration.
- How it is used
- Protects control-plane resources and restricts workload placement on selected nodes.
- How deep it goes
- Defines keys, optional values, effects, inspection, application, and toleration-based scheduling, without detailing scheduler internals.
- Examples
- Uses control-plane NoSchedule output, a dedicated worker taint, and an nginx pod verified with kubectl get pods -o wide.
- What you can do after
- Operate/configure taints, add tolerations, and verify whether pods schedule on tainted nodes.
Read how Acing the Certified Kubernetes Administrator Exam, Second Edition explains taint →
Kubernetes for Developers
A Kubernetes taint is node metadata that prevents Pods without a matching toleration from being scheduled on the node according to its effect.
- How it is used
- Reserves special or dedicated nodes by requiring eligible workloads to declare a matching toleration.
- How deep it goes
- Explains taint structure, NoSchedule behavior, tolerations, placement combinations, and Pending-Pod diagnosis without exhaustively detailing every effect.
- Examples
- Uses Arm, GPU, Spot, batch, noisy-neighbor, Minikube, and group-separated Deployment examples.
- What you can do after
- Operate/configure Kubernetes placement with taints, tolerations, selectors, and scheduling-event diagnosis.
Effective Platform Engineering
A taint is a Kubernetes node property that repels pods unless they declare a matching toleration.
- How it is used
- Controls workload placement by reserving tainted nodes for pods that explicitly declare matching tolerations.
- How deep it goes
- Defines the scheduling role and demonstrates a manifest, but does not explain scheduler internals.
- Examples
- Uses a storage-test pod scheduled onto management nodes with a dedicated management toleration.
- What you can do after
- Operate/configure Kubernetes scheduling by pairing node taints with matching pod tolerations.
Related concepts
- tolerationaddressed by · A Kubernetes toleration is Pod scheduling configuration that permits placement on a node with a matching taint without guaranteeing placement there.
- labelcontrasts with · A Kubernetes label is a key-value metadata pair attached to an object for identification, organization, querying, and selection.
- schedulingconfigures · Scheduling is the planning and coordination of when and in what order activities or computational work occur, potentially assigning them to available resources subject to constraints.
- workload separationused by · Workload separation is the isolation of distinct computational workloads to limit interference from resource use or failures in one workload.
- noscheduleconfigures · NoSchedule is a Kubernetes taint effect that prevents new Pods lacking a matching toleration from being scheduled on a node.
- workloadconfigures · A workload is the amount, pattern, or set of work, tasks, or processing activity assigned to or carried out by a person, application, or computing system.
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