148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

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Chapter 9 ■ Scheduling Pods on NodesFigure 9-59. Setting all the kubernetes.io/image-name key values to non existing valuesDelete the pod with-labels and create the pod again. The pod is still scheduled even though none ofthe nodes have matching labels, as shown in Figure 9-60. By comparison, when we used the node affinityrequiredDuringSchedulingIgnoredDuringExecution with none of the nodes having matching labels, thepods were placed in Pending status until a matching label was added. Now the pod is scheduled because thepreferredDuringSchedulingIgnoredDuringExecution setting is not binding and is only a hint.Figure 9-60. Pods are scheduled even though no nodes with matching labels are foundThe nodeSelector field if specified with node affinity preferredDuringSchedulingIgnoredDuringExecutionis still guaranteed. Add the nodeSelector field with the label kubernetes.io/image-name: nginx as shown inFigure 9-61. All the other matching expressions are set to kubernetes.io/image-name: hello-world.235
Chapter 9 ■ Scheduling Pods on NodesFigure 9-61. Setting nodeSelector in addiiton to node affinitypreferredDuringSchedulingIgnoredDuringExecutionDelete and create the with-labels pod again. The pod is scheduled on the node with kubernetes.io/image-name: nginx label because the nodeSelector expression is kubernetes.io/image-name: nginx asshown in Figure 9-62.Figure 9-62. The pod is scheduled on the node with label matching the nodeSelector expressionSummaryIn this chapter we first discussed the default scheduling policy used by Kubernetes. Then we used the defaultscheduler and also the node selector to schedule pods on nodes. We also discussed scheduling pods usingnode affinity. In the next chapter we shall discuss configuring compute resources.236
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KubernetesManagementDesign Patterns
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Kubernetes Management Design Patter
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■ CONTENTS AT A GLANCE■Part
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■ CONTENTSSetting Up Cluster Para
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■ CONTENTS■Chapter ■ 6: Us
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■ CONTENTSOvercommitting Resou
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■ CONTENTSInstalling OpenShift
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About the Technical ReviewerMassimo
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■ INTRODUCTIONpatterns are lan
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■ INTRODUCTIONIn Chapter 3 we
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CHAPTER 1Kubernetes on AWSKubernete
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Chapter 1 ■ Kubernetes on AWSIn t
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Chapter 1 ■ Kubernetes on AWSUsin
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Chapter 1 ■ Kubernetes on AWSClic
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Chapter 1 ■ Kubernetes on AWSFigu
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Testing the ClusterChapter 1 ■ Ku
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CHAPTER 2Kubernetes on CoreOS on AW
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Chapter 2 ■ Kubernetes on CoreOS
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Customizing the ClusterChapter 2
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Chapter 3 ■ Kubernetes on Google
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PART IIAdministration andConfigurat
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Chapter 6 ■ Using VolumesPodDocke
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Chapter 7 ■ Using ServicesAnother
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Chapter 7 ■ Using ServicesCreatin
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Chapter 7 ■ Using ServicesSimilar
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Chapter 7 ■ Using ServicesList th
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Chapter 7 ■ Using ServicesFigure
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Chapter 7 ■ Using ServicesInvoke
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Chapter 7 ■ Using ServicesIn addi
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Chapter 8 ■ Using Rolling Updates
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CHAPTER 13Using AutoscalingStarting
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CHAPTER 14Configuring LoggingLoggin
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Chapter 14 ■ Configuring Logging
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Docker Log FilesChapter 14 ■ Conf
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CHAPTER 15Using an HA Master with O
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Installing the Network ManagerChapt
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Chapter 16 ■ Developing a Highly
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■ INDEXClusters (cont.)configurat
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■ INDEXKubernetes (cont.)nodes, 6
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■ INDEXRoute 53 service (cont.)de
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