Using AWS AppConfig with EKS without Stress and Code Changes

AWS AppConfig is a powerful service that enables runtime configuration management for applications running on AWS. It allows you to dynamically adjust application behavior without requiring redeployment or code changes. This is especially useful in Kubernetes environments like Amazon Elastic Kubernetes Service (EKS), where seamless configuration updates can improve operational efficiency.

You Should Know:

1. Setting Up AWS AppConfig

To use AWS AppConfig, follow these steps:

1. Create an AppConfig Application:

aws appconfig create-application --name MyAppConfigApp 

2. Define a Configuration Profile:

aws appconfig create-configuration-profile \ 
--application-id <APP_ID> \ 
--name MyConfigProfile \ 
--location-uri hosted 

3. Store Configuration Data:

Use AWS Systems Manager Parameter Store or AWS Secrets Manager to store configurations.

4. Deploy the Configuration:

aws appconfig start-deployment \ 
--application-id <APP_ID> \ 
--configuration-profile-id <PROFILE_ID> \ 
--environment-id <ENV_ID> \ 
--deployment-strategy-id AppConfig.AllAtOnce 

2. Integrating AWS AppConfig with EKS

To fetch configurations in EKS, use the AWS SDK or the AppConfig Agent:

• Using AWS SDK (Python Example):

  import boto3 
  client = boto3.client('appconfigdata') </li>
  </ul>
  
  token = client.start_configuration_session( 
  ApplicationIdentifier='MyAppConfigApp', 
  EnvironmentIdentifier='MyEnv', 
  ConfigurationProfileIdentifier='MyConfigProfile' 
  ).get('InitialConfigurationToken')
  
  response = client.get_latest_configuration(ConfigurationToken=token) 
  config_data = response['Configuration'].read().decode('utf-8') 
  

  • Using AppConfig Agent (Sidecar Pattern in Kubernetes):
    Deploy a sidecar container in your EKS pods to fetch configurations:

    containers: </li>
    <li>name: appconfig-agent 
    image: amazon/aws-appconfig-agent 
    env: </li>
    <li>name: AWS_APPCONFIG_APPLICATION 
    value: "MyAppConfigApp" </li>
    <li>name: AWS_APPCONFIG_ENVIRONMENT 
    value: "MyEnv" </li>
    <li>name: AWS_APPCONFIG_CONFIGURATION 
    value: "MyConfigProfile" 
    

  3. Dynamic Configuration Reloading

  AWS AppConfig supports automatic reloading via AWS Lambda or EventBridge. Example Lambda function:

  def lambda_handler(event, context): 
   Fetch new config and update Kubernetes ConfigMap 
  subprocess.run(["kubectl", "apply", "-f", "updated-config.yaml"]) 
  

  What Undercode Say:

  AWS AppConfig simplifies runtime configuration management, reducing downtime and manual intervention. By integrating it with EKS, you gain:
  – Zero-downtime updates
  – Feature flagging
  – Environment-specific settings

  Use these commands to streamline your workflow:

   Check AppConfig deployment status 
  aws appconfig get-deployment --application-id <APP_ID> --environment-id <ENV_ID> --deployment-number <DEPLOY_NUM>
  
  List all configurations 
  aws appconfig list-configuration-profiles --application-id <APP_ID>
  
  Rollback a deployment 
  aws appconfig stop-deployment --application-id <APP_ID> --environment-id <ENV_ID> --deployment-number <DEPLOY_NUM> 
  

  For further reading, visit:

  • AWS AppConfig Documentation
  • Using AWS AppConfig with EKS

  Expected Output:

  A dynamically configurable EKS environment with AWS AppConfig, enabling seamless feature rollouts and debugging without redeployment.

  References:

  Reported By: Darryl Ruggles – Hackers Feeds
  Extra Hub: Undercode MoN
  Basic Verification: Pass ✅

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