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<title>Optional: Test the resiliency · IBM Cloud Kubernetes Service Lab</title>
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<li class="header">Introduction</li>
<li class="chapter " data-level="1.1" data-path="./">
<a href="./">
<b>1.1.</b>
Lab Overview
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</li>
<li class="header">Preparation</li>
<li class="chapter " data-level="2.1" data-path="prepare-prereq.html">
<a href="prepare-prereq.html">
<b>2.1.</b>
Pre-Requisites
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<li class="chapter " data-level="2.2" data-path="prepare-plugins.html">
<a href="prepare-plugins.html">
<b>2.2.</b>
Install Container Plugins
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<a href="prepare-cli.html">
<b>2.3.</b>
Main command lines
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<a href="prepare-get-cluster.html">
<b>2.4.</b>
Get a cluster
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<li class="header">Lab 1 - Deploy an app in a Kubernetes cluster</li>
<li class="chapter " data-level="3.1" data-path="view-cluster.html">
<a href="view-cluster.html">
<b>3.1.</b>
View your cluster
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<a href="kube-dashboard.html">
<b>3.2.</b>
Kubernetes Dashboard
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<li class="chapter " data-level="3.3" data-path="connect-via-cli.html">
<a href="connect-via-cli.html">
<b>3.3.</b>
Connect via CLI
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<li class="chapter " data-level="3.4" data-path="get-app.html">
<a href="get-app.html">
<b>3.4.</b>
Get and run the app locally
</a>
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<li class="chapter " data-level="3.5" data-path="docker-build.html">
<a href="docker-build.html">
<b>3.5.</b>
Build docker image
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<b>3.6.</b>
Push docker image
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<b>3.7.</b>
Deploy app
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<b>3.8.</b>
Scale app
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<a href="connect-database.html">
<b>3.9.</b>
Optional: Connect to a database
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<li class="chapter active" data-level="3.10" data-path="test-resiliency.html">
<a href="test-resiliency.html">
<b>3.10.</b>
Optional: Test the resiliency
</a>
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<li class="chapter " data-level="3.11" data-path="clean-up.html">
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<b>3.11.</b>
Clean up
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<li class="header">Lab 2 - DevOps and Helm charts</li>
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<b>4.1.</b>
Deploy with Helm
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<li class="chapter " data-level="4.2" data-path="devops-continuous-delivery.html">
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<b>4.2.</b>
Deploy with Continuous Delivery
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<li class="chapter " data-level="4.3" data-path="monitor-debug.html">
<a href="monitor-debug.html">
<b>4.3.</b>
Optional: Troubleshoot and Debug
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<li class="header">Lab 3 - Monitor your cluster</li>
<li class="chapter " data-level="5.1" data-path="monitor-cluster-logs.html">
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<b>5.1.</b>
Cluster Logs
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<li class="chapter " data-level="5.2" data-path="monitor-cluster-metrics.html">
<a href="monitor-cluster-metrics.html">
<b>5.2.</b>
Monitoring your cluster
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<li class="header">Advanced</li>
<li class="chapter " data-level="6.1" data-path="appendix-create-cluster-cli.html">
<a href="appendix-create-cluster-cli.html">
<b>6.1.</b>
Create a cluster with CLI
</a>
</li>
<li class="chapter " data-level="6.2" data-path="appendix-create-cluster-ui.html">
<a href="appendix-create-cluster-ui.html">
<b>6.2.</b>
Create a cluster in the Console
</a>
</li>
<li class="chapter " data-level="6.3" data-path="weavescope.html">
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<b>6.3.</b>
Weavescope
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<li class="chapter " data-level="6.4" data-path="appendix-terraform.html">
<a href="appendix-terraform.html">
<b>6.4.</b>
Provisioning with Terraform
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<li class="chapter " data-level="6.5" data-path="calico.html">
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<b>6.5.</b>
Controlling traffic with network policies
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<b>6.6.</b>
Appendix
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Resources
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<h1>
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<a href="." >Optional: Test the resiliency</a>
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<h1 id="test-resiliency">Test Resiliency</h1>
<ol>
<li><p>Activate the watch on the pod in a separate windows to track what's going on your pods while you kill your worker nodes:</p>
<pre class="language-"><code class="lang-sh"> kubectl get po -o wide -w
</code></pre>
</li>
<li><p>First, identify the name of the node you wish to drain. You can list all of the nodes and their respective IPs in your cluster with</p>
<pre class="language-"><code class="lang-sh"> kubectl get nodes
</code></pre>
</li>
<li><p>Next, tell Kubernetes to drain the node:</p>
<pre class="language-"><code class="lang-sh"> kubectl drain <span class="token operator"><</span>node name<span class="token operator">></span> --ignore-daemonsets --delete-local-data
</code></pre>
<p> The node name is the private IP address in IKS. </p>
<p> Output:</p>
<pre class="language-"><code> node/10.135.52.88 already cordoned
WARNING: Deleting pods with local storage: kubernetes-dashboard-7d5d4f48c4-pmgp9; Ignoring DaemonSet-managed pods: logdna-agent-lm8v4, calico-node-78rms, ibm-keepalived-watcher-l6vp8, ibm-kube-fluentd-5ghgk, ibm-master-proxy-48ttq
pod/ibm-storage-watcher-74c46db958-hfz5v evicted
pod/kubernetes-dashboard-7d5d4f48c4-pmgp9 evicted
pod/ibm-cloud-provider-ip-161-156-93-78-5c7d96bb68-pvg9j evicted
pod/ibm-file-plugin-b759f7cb7-6jmdx evicted
pod/kube-dns-autoscaler-6cf64dc49f-gh6xk evicted
pod/calico-kube-controllers-6744d867-7fgxl evicted
pod/public-crac8b7d523dea4c85bea1139ef7328163-alb1-657b4fbbb4-xvq2q evicted
pod/client-certificate-demo-676dbdd676-8b7k7 evicted
pod/kube-dns-amd64-5dc4d6b67-clvnh evicted
</code></pre></li>
<li><p>Check the status of your node. You should see the status <code>SchedulingDisabled</code></p>
<pre class="language-"><code> NAME STATUS ROLES AGE VERSION
10.123.12.75 Ready <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>none</span><span class="token punctuation">></span></span> 48d v1.11.3+IKS
10.135.52.88 Ready,SchedulingDisabled <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>none</span><span class="token punctuation">></span></span> 48d v1.11.3+IKS
</code></pre></li>
<li><p>Tell Kubernetes that it can resume scheduling new pods onto the node</p>
<pre class="language-"><code class="lang-sh"> kubectl uncordon <span class="token operator"><</span>node name<span class="token operator">></span>
</code></pre>
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