Tasks

Tasks
Administer a Cluster
Access Clusters Using the Kubernetes API
Access Services Running on Clusters
Advertise Extended Resources for a Node
Autoscale the DNS Service in a Cluster
Change the Reclaim Policy of a PersistentVolume
Change the default StorageClass
Cluster Management
Configure Multiple Schedulers
Configure Out Of Resource Handling
Configure Quotas for API Objects
Control CPU Management Policies on the Node
Customizing DNS Service
Debugging DNS Resolution
Declare Network Policy
Developing Cloud Controller Manager
Encrypting Secret Data at Rest
Guaranteed Scheduling For Critical Add-On Pods
IP Masquerade Agent User Guide
Kubernetes Cloud Controller Manager
Limit Storage Consumption
Namespaces Walkthrough
Operating etcd clusters for Kubernetes
Reconfigure a Node's Kubelet in a Live Cluster
Reserve Compute Resources for System Daemons
Safely Drain a Node while Respecting Application SLOs
Securing a Cluster
Set Kubelet parameters via a config file
Set up High-Availability Kubernetes Masters
Share a Cluster with Namespaces
Static Pods
Storage Object in Use Protection
Using CoreDNS for Service Discovery
Using a KMS provider for data encryption
Using sysctls in a Kubernetes Cluster
Extend kubectl with plugins
Manage HugePages
Schedule GPUs

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Assign Pods to Nodes

This page shows how to assign a Kubernetes Pod to a particular node in a Kubernetes cluster.

Before you begin

You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube, or you can use one of these Kubernetes playgrounds:

To check the version, enter kubectl version.

Add a label to a node

  1. List the nodes in your cluster:

    kubectl get nodes

    The output is similar to this:

    NAME      STATUS    ROLES     AGE     VERSION
    worker0   Ready     <none>    1d      v1.11.1
    worker1   Ready     <none>    1d      v1.11.1
    worker2   Ready     <none>    1d      v1.11.1
  2. Chose 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.

  3. 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      v1.11.1        ...,disktype=ssd,kubernetes.io/hostname=worker0
    worker1   Ready     <none>   1d      v1.11.1        ...,kubernetes.io/hostname=worker1
    worker2   Ready     <none>   1d      v1.11.1        ...,kubernetes.io/hostname=worker2

    In the preceding output, you can see that the worker0 node has a disktype=ssd label.

Create a pod that gets scheduled to your chosen node

This pod configuration file describes a pod that has a node selector, disktype: ssd. This means that the pod will get scheduled on a node that has a disktype=ssd label.

pods/pod-nginx.yaml
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: test
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  nodeSelector:
    disktype: ssd
  1. Use the configuration file to create a pod that will get scheduled on your chosen node:

    kubectl create -f https://k8s.io/examples/pods/pod-nginx.yaml
  2. 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 next

Learn more about labels and selectors.