How do I achieve zero-downtime deployments for AWS KMS?

Achieving zero-downtime deployments for AWS KMS (Key Management Service) involves implementing strategies that avoid disruption in access to cryptographic keys during updates. Here are some best practices to consider:

  • Blue/Green Deployments: Maintain two identical environments, one active and one idle. Deploy the new version to the idle environment, then swap traffic once it's verified.
  • Canary Releases: Gradually roll out changes to a small subset of users before full deployment. This allows you to monitor the impact of the new version.
  • Feature Toggles: Use feature flags to enable or disable features without deploying new code, allowing for safe incremental updates.
  • Rolling Updates: Update components in a staggered manner instead of all at once to limit disruption.

Here’s a simple example of how you might implement a feature toggle for a new KMS integration:

<?php $featureToggleEnabled = true; // This value could come from a config file $keyId = $featureToggleEnabled ? 'new-kms-key-id' : 'old-kms-key-id'; // Use the selected KMS key to encrypt data $dataToEncrypt = 'Sensitive Data'; $kmsClient = new Aws\Kms\KmsClient([...]); $result = $kmsClient->encrypt([ 'KeyId' => $keyId, 'Plaintext' => $dataToEncrypt, ]); echo 'Encrypted Data: ' . base64_encode($result['CiphertextBlob']); ?>

AWS KMS zero-downtime deployment blue/green deployment canary release feature toggles

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