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

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Chapter 13 ■ Using AutoscalingFigure 13-19. The number of pods increases to 5 when load is increasedSummaryThis chapter introduced autoscaling. To demonstrate autoscaling we create a PHP Apache Serverdeployment and created a service for the deployment. Subsequently we created a horizontal pod autoscalerand tested autoscaling by increasing load on the Apache server. In the next chapter we shall discussconfiguring logging.308
CHAPTER 14Configuring LoggingLogging is the process of collecting and storing log messages generated by different components of a system(which would be a Kubernetes cluster) and by applications running on the cluster.ProblemOne of the problems associated with logging is demarcating the components and applications generatinglogging messages. Another problem is decoupling the logging from the component/application. Thecomponent generating logs in a Kubernetes application would be a container in a pod.SolutionA container runs in isolation on the Docker Engine and is an object from which the single-containermanagement pattern of tracking an application running within a container, including applicationspecificlogging, can be used. Similarly, a pod is an object generating its own logging messages, and so is areplication controller and a service.A design pattern introduced in the recent publication Design Patterns for Container-based DistributedSystems, by Brendan Burns and David Oppenheimer (https://www.usenix.org/node/196347) is asingle-node multi-container application pattern called the Sidecar Pattern, using which a main container(for example a container generating web server logs) could be paired with a “logsaver” sidecar container,as shown in Figure 14-1, to collect the web server’s logs from the local disk filesystem and stream them toa cluster storage system. Sidecar containers are made feasible by containers on the same machine beingable to share a local disk volume.MainContainerWeb ServerSidecarContainerLoggingContainerFigure 14-1. Sidecar container for logging© Deepak Vohra 2017D. Vohra, Kubernetes Management Design Patterns, DOI 10.1007/978-1-4842-2598-1_14309
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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 7 ■ Using ServicesAnother
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Chapter 7 ■ Using ServicesCreatin
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Chapter 7 ■ Using ServicesList th
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Chapter 8 ■ Using Rolling Updates
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Chapter 9 ■ Scheduling Pods on No
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Chapter 10 ■ Configuring Compute
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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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148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

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