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A Practical Guide to Kubernetes

Preparing for the Cluster Setup: Availability Zones and SSH Keys

Explore how to select availability zones in AWS and generate SSH keys essential for secure access while preparing to build a production-ready Kubernetes cluster. Understand best practices for environment setup that ensures cluster availability and security.

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Setting up the availability zones

In this lesson, we will decide which availability zones we should use. So, let’s look at what’s available in the us-east-2 region:

Shell
aws ec2 describe-availability-zones \
    --region $AWS_DEFAULT_REGION

The output is as follows:

Shell
{
    "AvailabilityZones": [
        {
            "State": "available", 
            "RegionName": "us-east-2", 
            "Messages": [], 
            "ZoneID": "use2-az1",
            "ZoneName": "us-east-2a"
        }, 
        {
            "State": "available", 
            "RegionName": "us-east-2", 
            "Messages": [],
            "ZoneID": "use2-az2", 
            "ZoneName": "us-east-2b"
        }, 
        {
            "State": "available", 
            "RegionName": "us-east-2", 
            "Messages": [], 
            "ZoneID": "use2-az3",
            "ZoneName": "us-east-2c"
        }
    ]
}

As we can see, the region has three availability zones. We’ll store them in an environment variable.

Note: Windows users should use tr '\r\n' ', ' instead of tr '\n' ',' in the following command: ...