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

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Chapter 7 ■ Using ServicesTable 7-1. Types of ServicesServiceType External IP DescriptionClusterIP No The default; exposes a service from within a cluster only.NodePort Yes In addition to exposing the service within a cluster, exposesthe service at each node in the cluster at a specific port at URL<NodeIP>:NodePort.LoadBalancer Yes In addition to exposing a service within the cluster and at each nodein the cluster exposes the service at an external LoadBalancer IP.In this chapter we shall discuss each of the ServiceTypes with an example. This chapter has thefollowing sections:Setting the EnvironmentCreating a ClusterIP ServiceCreating a NodePort ServiceCreating a LoadBalancer ServiceSetting the EnvironmentCreate an AWS EC2 instance from Amazon Linux AMI. SSH log in to the EC2 instance using the public IPaddress:ssh -i "docker.pem" ec2-user@107.23.131.161Create a CoreOS AWS CloudFormation for a Kubernetes cluster. Add an A record for the clustercontroller instance to the public DNS name for the CloudFormation and SSH log in to the controllerinstance:ssh -i "kubernetes-coreos.pem" core@52.203.239.87Install kubectl binaries and list the nodes:./kubectl get nodesThe nodes in the cluster should be listed, as shown in Figure 7-3.Figure 7-3. Listing nodes in a Kubernetes cluster155
Chapter 7 ■ Using ServicesCreating a ClusterIP ServiceIn this section we shall create a service of type ClusterIP, which is the default service type. First, create adeployment using the Docker image tutum/hello-world with three replicas:./kubectl run hello-world --image=tutum/hello-world --replicas=3 --port=80Next, list the deployments:./kubectl get deploymentsA hello-world deployment is created and listed as shown in Figure 7-4.Figure 7-4. Creating and listing the deploymentsList the pods:./kubectl get podsThe three pod replicas are listed. Expose the deployment as a service of type ClusterIP, which is thedefault, but may also be specified explicitly../kubectl expose deployment hello-world --port=80 --type=ClusterIPList the services:./kubectl get servicesThe hello-world service should be listed in addition to the kubernetes service and any other services,as shown in Figure 7-5.Figure 7-5. Creating and listing a service156
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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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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 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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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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148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

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