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

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Chapter 9 ■ Scheduling Pods on NodesFigure 9-29. Listing node labels after removing labelsCreate the two pods again using the same pod definition files, as shown in Figure 9-30.Figure 9-30. Creating pods using definition files used earlierList the pods cluster-wide. The pods are listed with the STATUS column value as Pending, as shown inFigure 9-31, because none of the nodes have labels that are the same as specified in the nodeSelector field.Figure 9-31. Pods with “pending” statusAdd labels to the nodes to match the nodeSelector field settings in the pod definitions, as shown inFigure 9-32.Figure 9-32. Labeling nodes to match nodeSelector labels219
Chapter 9 ■ Scheduling Pods on NodesThen list the pods; the pods should not be in Pending status, having completed or running as shown inFigure 9-33. The pods are scheduled when suitable nodes are found.Figure 9-33. Previously Pendingpods are scheduled when nodes with matching labels are foundIf node labels are modified at runtime, for example if a label from a node is removed, a Running poddoes not have its status changed to Pending and continues to run if running even though the node on whichthe pod is running does not have a matching label. As an example, remove the labels from the node onwhich the nginx pod is running, and the pod continues to run as shown in Figure 9-34.Figure 9-34. A running pod continues to run on a node even though matching labels from node are removedSetting Node AffinityStarting with version 1.2, Kubernetes offers an alpha version of a new mechanism for selecting nodes, callednode affinity. The alpha version of node affinity is based on labels, but support for other types of nodeaffinity is planned to be added, such as scheduling pods on a node based on which other pods are runningon the node. Currently, two types of node affinity are supported as discussed in Table 9-3.220
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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 4 ■ Using Multiple ZonesS
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Chapter 6 ■ Using VolumesPodDocke
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Chapter 6 ■ Using VolumesChange d
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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 ServicesFigure
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CHAPTER 12Using Resource QuotasIn C
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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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Chapter 15 ■ Using an HA Master w
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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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