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Merge pull request #88 from open-guides/iam-api-availability

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IAM API dependency gotcha
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Joshua Levy 2016-10-10 08:01:26 -07:00 committed by GitHub
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@ -538,6 +538,7 @@ We cover security basics first, since configuring user accounts is something you
- One solution is to have code or scripts cache and reuse the credentials locally for a short period (say 2 minutes). For example, they can be put into the ~/.aws/credentials file but must also be refreshed automatically.
- But be careful not to cache credentials for too long, as [they expire](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html#instance-metadata-security-credentials). (Note the other [dynamic metadata](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html#dynamic-data-categories) also changes over time and should not be cached a long time, either.)
- 🔸Some IAM operations are slower than other API calls (many seconds), since AWS needs to propagate these globally across regions.
- ❗The uptime of IAM’s API has historically been lower than that of the instance metadata API. Be wary of incorporating a dependency on IAM’s API into critical paths or subsystems — for example, if you validate a user’s IAM group membership when they log into an instance and aren’t careful about precaching group membership or maintaining a back door, you might end up locking users out altogether when the API isn’t available.
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