website/content/en/docs/tasks/manage-daemon/pods-some-nodes.md

title	content_type	weight
Running Pods on Only Some Nodes	task	30

This page demonstrates how can you run {{<glossary_tooltip term_id="pod" text="Pods">}} on only some {{<glossary_tooltip term_id="node" text="Nodes">}} as part of a {{<glossary_tooltip term_id="daemonset" text="DaemonSet">}}

{{% heading "prerequisites" %}}

{{< include "task-tutorial-prereqs.md" >}}

Running Pods on only some Nodes

Imagine that you want to run a {{<glossary_tooltip term_id="daemonset" text="DaemonSet">}}, but you only need to run those daemon pods on nodes that have local solid state (SSD) storage. For example, the Pod might provide cache service to the node, and the cache is only useful when low-latency local storage is available.

Step 1: Add labels to your nodes

Add the label ssd=true to the nodes which have SSDs.

kubectl label nodes example-node-1 example-node-2 ssd=true

Step 2: Create the manifest

Let's create a {{<glossary_tooltip term_id="daemonset" text="DaemonSet">}} which will provision the daemon pods on the SSD labeled {{<glossary_tooltip term_id="node" text="nodes">}} only.

Next, use a nodeSelector to ensure that the DaemonSet only runs Pods on nodes with the ssd label set to "true".

{{% code_sample file="controllers/daemonset-label-selector.yaml" %}}

Step 3: Create the DaemonSet

Create the DaemonSet from the manifest by using kubectl create or kubectl apply

Let's label another node as ssd=true.

kubectl label nodes example-node-3 ssd=true

Labelling the node automatically triggers the control plane (specifically, the DaemonSet controller) to run a new daemon pod on that node.

kubectl get pods -o wide

The output is similar to:

NAME                              READY     STATUS    RESTARTS   AGE    IP      NODE
<daemonset-name><some-hash-01>    1/1       Running   0          13s    .....   example-node-1
<daemonset-name><some-hash-02>    1/1       Running   0          13s    .....   example-node-2
<daemonset-name><some-hash-03>    1/1       Running   0          5s     .....   example-node-3