Simple EKS Node Group Module

Selecting an Instance Type for EKS Clusters

Several factors need to be considered when choosing an instance type for an EKS cluster:

• Number of vCPUs
• Amount of memory
• Networking capacity
• Cost

Another important criteria is the maximum number of pods the cluster can concurrently run. In a cluster using native VPC networking the maximum number of pods is limited by the number of network interfaces in an instance. Here you can find a list of pod count limits per instance type.

This module supports enabling high pod density to overcome this limitation. See variable enable_high_pod_density.

Development

Testing

We use Terratest to run integration tests.

Before running the tests the following environment variables must be set:

• AWS_PROFILE: the AWS profile to use for the test
• AWS_DEFAULT_REGION: region where the test cluster will be created
• SIMPLE_EKS_TEST_VPC_NAME: VPC to be used by the test cluster

Then, go into test folder and run:

go test -v -timeout 30m

References

• Launch templates
• Launch templates and custom AMI support