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

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Setting the EnvironmentChapter 8 ■ Using Rolling UpdatesCreate an Amazon EC2 instance based on the Amazon Linux AMI. Obtain the public IP of the instance andSSH log in to the instance:ssh -i "docker.pem" ec2-user@54.87.191.230Create a Kubernetes cluster using an AWS CloudFormation consisting of a single controller and threeworker nodes running CoreOS, as shown in Figure 8-2.Figure 8-2. CloudFormation EC2 instancesAfter starting the cluster and setting up an A record for the controller instance IP address in the publicDNS name for the CloudFormation, SSH log in to the controller instance:ssh -i "kubernetes-coreos.pem" core@52.205.169.82The controller CoreOS instance is logged in as shown in Figure 8-3.Figure 8-3. SSH logging into the controller instanceInstall kubectl binaries and list the nodes:./kubectl get nodesThe single controller node and the three worker nodes are listed as shown in Figure 8-4.173
Chapter 8 ■ Using Rolling UpdatesFigure 8-4. Listing the nodesThe kubectl rolling-update command is used to perform a rolling update. The syntax for therolling-update command is as follows.kubectl rolling-update OLD_CONTROLLER_NAME ([NEW_CONTROLLER_NAME] --image=NEW_CONTAINER_IMAGE | -f NEW_CONTROLLER_SPEC)The old container name is required to be specified, and if a new controller name is to be assigned tothe updated RC, a new controller name may be specified. Either a new container image or a new containerspecification must be specified as a command parameter. Next, we shall discuss performing a rolling updateusing each of the methods; a new container image and a new controller specification.Rolling Update with an RC Definition FileIn this section we’ll discuss the rolling update of an existing replication controller by providing an RCdefinition file to the kubectl rolling-update command. The following requirements apply for rollingupdatingan RC.1. The new replication controller must be in the same namespace.2. The new replication controller name in the definition file must not be the sameas the existing replication controller being updated.3. The new replication controller must specify at least one matching key with anonequal value in the selector field.First, create a replication controller to be updated. The following RC definition file mysql.yaml createsan RC called mysql and specifies three replicas. Create a definition file mysql.yaml in a vi editor:sudo vi mysql.yamlCopy the following source code to the definition file:---apiVersion: v1kind: ReplicationControllermetadata:name: mysqllabels:app: mysql-app174
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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 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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