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

marco.cirilli
from marco.cirilli More from this publisher
19.06.2021 Views

OverviewChapter 4 ■ Using Multiple ZonesIn this chapter we shall create a multiple-zone AWS CloudFormation on CoreOS. We shall also demonstratevolume-zone affinity for a persistent volume on a multiple-zone cluster with AWS cloud provider. The stepswe’ll take are as follows:Setting the environmentInitializing a CloudFormationConfiguring cluster.yaml for multiple zonesLaunching the CloudFormationConfiguring External DNSRunning a Kubernetes ApplicationUsing Multiple Zones on AWSSetting the EnvironmentYou’ll find the details of creating a Kubernetes cluster on a CoreOS AWS CloudFormation in Chapter 2. Weonly need to start a single EC2 instance to launch the CloudFormation from. Create an EC2 instance usingthe Amazon Linux AMI, which has the AWS CLI installed by default; the AWS CLI is used to initialize andlaunch a CloudFormation. Obtain the Public IP address of the EC2 instance from the EC2 console. SSH log ininto the EC2 instance:ssh -i "docker.pem" ec2-user@184.73.19.214The Amazon Linux AMI command prompt is displayed.Because we will be launching an AWS CloudFormation for a Kubernetes cluster, the CloudFormationstack name must be one that is not already used. If a CloudFormation stack name is already used an errorsimilar to the following (Figure 4-3) is generated.Figure 4-3. Stack already exists errorTo find whether a CloudFormation stack name can be used, click Services ➤ CloudFormation as shownin Figure 4-4.93

Chapter 4 ■ Using Multiple ZonesFigure 4-4. Choosing Services ➤ CloudFormationThe stacks are listed as shown in Figure 4-5. A stack name the same as one that is listed cannot be usedto create a new stack.Figure 4-5. Listing the CloudFormation stacks94

Chapter 4 ■ Using Multiple Zones

Figure 4-4. Choosing Services ➤ CloudFormation

The stacks are listed as shown in Figure 4-5. A stack name the same as one that is listed cannot be used

to create a new stack.

Figure 4-5. Listing the CloudFormation stacks

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