From cae9b11262fa0c51500ed840208060ea80692109 Mon Sep 17 00:00:00 2001
From: Dhairya-Arora01 <90555081+Dhairya-Arora01@users.noreply.github.com>
Date: Wed, 10 May 2023 07:28:59 +0530
Subject: [PATCH] Created new task page - Running Pods on Only Some Nodes
 (#39972)

* Added pod-some-nodes in manage-daemon of taskks

* Changedd the code file reference

* Added the code ouput

* Added the suggested changes

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

Co-authored-by: Nitish Kumar <justnitish06@gmail.com>

* Suggested changes

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

Co-authored-by: Rey Lejano <rlejano@gmail.com>

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

Co-authored-by: Tim Bannister <tim@scalefactory.com>

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

Co-authored-by: Tim Bannister <tim@scalefactory.com>

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

Co-authored-by: Tim Bannister <tim@scalefactory.com>

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

Co-authored-by: Tim Bannister <tim@scalefactory.com>

---------

Co-authored-by: Nitish Kumar <justnitish06@gmail.com>
Co-authored-by: Rey Lejano <rlejano@gmail.com>
Co-authored-by: Tim Bannister <tim@scalefactory.com>
---
 .../tasks/manage-daemon/pods-some-nodes.md    | 61 +++++++++++++++++++
 .../controllers/daemonset-label-selector.yaml | 20 ++++++
 2 files changed, 81 insertions(+)
 create mode 100644 content/en/docs/tasks/manage-daemon/pods-some-nodes.md
 create mode 100644 content/en/examples/controllers/daemonset-label-selector.yaml

diff --git a/content/en/docs/tasks/manage-daemon/pods-some-nodes.md b/content/en/docs/tasks/manage-daemon/pods-some-nodes.md
new file mode 100644
index 0000000000..987adf0d3b
--- /dev/null
+++ b/content/en/docs/tasks/manage-daemon/pods-some-nodes.md
@@ -0,0 +1,61 @@
+---
+title: Running Pods on Only Some Nodes
+content_type: task
+weight: 30
+---
+<!-- overview -->
+
+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.
+
+```shell
+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"`.
+
+{{<codenew 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`.
+
+```shell
+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.
+
+```shell
+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
+```
\ No newline at end of file
diff --git a/content/en/examples/controllers/daemonset-label-selector.yaml b/content/en/examples/controllers/daemonset-label-selector.yaml
new file mode 100644
index 0000000000..458e19ceb4
--- /dev/null
+++ b/content/en/examples/controllers/daemonset-label-selector.yaml
@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: ssd-driver
+  labels:
+    app: nginx
+spec:
+  selector:
+    matchLabels:
+      app: ssd-driver-pod
+  template:
+    metadata:
+      labels:
+        app: ssd-driver-pod
+    spec:
+      nodeSelector:
+        ssd: "true"
+      containers:
+        - name: example-container
+          image: example-image
\ No newline at end of file