What is the effect of setting the environment variable AWS_VPC_K8S_CNI_CUSTOM_NETWORK_CFG=true in the VPC CNI plugin?

medium📝 service behavior Q5 of 15

AWS - EKS

What is the effect of setting the environment variable AWS_VPC_K8S_CNI_CUSTOM_NETWORK_CFG=true in the VPC CNI plugin?

ADisables the VPC CNI plugin entirely

BAutomatically scales the number of ENIs

CForces pods to use host network namespace

DEnables custom networking for pods on secondary ENIs

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of the environment variable
Setting AWS_VPC_K8S_CNI_CUSTOM_NETWORK_CFG to true enables custom networking mode, allowing pods to be assigned IPs from secondary ENIs.
Step 2: Eliminate incorrect effects
The variable does not disable the plugin, force host networking, or auto-scale ENIs.
Final Answer:
Enables custom networking for pods on secondary ENIs -> Option D
Quick Check:
Custom network config = true enables secondary ENI pod IPs [OK]

Quick Trick: Custom network config true = pods use secondary ENIs [OK]

Common Mistakes:

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