# Assign Pods to Nodes using Node Affinity

Assign Pods to Nodes using Node AffinityThis page shows how to assign a Kubernetes Pod to a particular node using Node Affinity in a Kubernetes cluster.Before you beginYou need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. It is recommended to run this tutorial on a cluster with at least two nodes that are not acting as control plane hosts. If you do not already have a cluster, you can create one by using minikube or you can use one of these Kubernetes playgrounds:iximiuz LabsKillercodaKodeKloudPlay with KubernetesYour Kubernetes server must be at or later than version v1.10.To check the version, enter kubectl version.Add a label to a nodeList the nodes in your cluster, along with their labels:kubectl get nodes --show-labels The output is similar to this:NAME STATUS ROLES AGE VERSION LABELS worker0 Ready <none> 1d v1.13.0 ...,kubernetes.io/hostname=worker0 worker1 Ready <none> 1d v1.13.0 ...,kubernetes.io/hostname=worker1 worker2 Ready <none> 1d v1.13.0 ...,kubernetes.io/hostname=worker2 Choose one of your nodes, and add a label to it:kubectl label nodes <your-node-name> disktype=ssd where <your-node-name> is the name of your chosen node.Verify that your chosen node has a disktype=ssd label:kubectl get nodes --show-labels The output is similar to this:NAME STATUS ROLES AGE VERSION LABELS worker0 Ready <none> 1d v1.13.0 ...,disktype=ssd,kubernetes.io/hostname=worker0 worker1 Ready <none> 1d v1.13.0 ...,kubernetes.io/hostname=worker1 worker2 Ready <none> 1d v1.13.0 ...,kubernetes.io/hostname=worker2 In the preceding output, you can see that the worker0 node has a disktype=ssd label.Schedule a Pod using required node affinityThis manifest describes a Pod that has a requiredDuringSchedulingIgnoredDuringExecution node affinity,disktype: ssd. This means that the pod will get scheduled only on a node that has a disktype=ssd label.pods/pod-nginx-required-affinity.yaml apiVersion: v1 kind: Pod metadata: name: nginx spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: disktype operator: In values: - ssd containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent Apply the manifest to create a Pod that is scheduled onto your chosen node:kubectl apply -f https://k8s.io/examples/pods/pod-nginx-required-affinity.yaml Verify that the pod is running on your chosen node:kubectl get pods --output=wide The output is similar to this:NAME READY STATUS RESTARTS AGE IP NODE nginx 1/1 Running 0 13s 10.200.0.4 worker0 Schedule a Pod using preferred node affinityThis manifest describes a Pod that has a preferredDuringSchedulingIgnoredDuringExecution node affinity,disktype: ssd. This means that the pod will prefer a node that has a disktype=ssd label.pods/pod-nginx-preferred-affinity.yaml apiVersion: v1 kind: Pod metadata: name: nginx spec: affinity: nodeAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 preference: matchExpressions: - key: disktype operator: In values: - ssd containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent Apply the manifest to create a Pod that is scheduled onto your chosen node:kubectl apply -f https://k8s.io/examples/pods/pod-nginx-preferred-affinity.yaml Verify that the pod is running on your chosen node:kubectl get pods --output=wide The output is similar to this:NAME READY STATUS RESTARTS AGE IP NODE nginx 1/1 Running 0 13s 10.200.0.4 worker0 What's nextLearn more about Node Affinity.