Quotas and other considerations for continuous deployment
CloudFront continuous deployment is subject to the following quotas and other considerations.
Quotas
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Maximum number of staging distributions per Amazon Web Services account: 20
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Maximum number of continuous deployment policies per Amazon Web Services account: 20
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Maximum percentage of traffic you can send to a staging distribution in a weight-based configuration: 15%
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Minimum and maximum values for session stickiness idle duration: 300–3600 seconds
For more information, see Quotas.
Note
When using continuous deployment and your primary distribution is set with OAC for S3 bucket access, update your S3 bucket policy to allow access for the staging distribution. For example S3 bucket policies, see Give the origin access control permission to access the S3 bucket.
Amazon WAF web ACLs
If you enable continuous distribution for your distribution, the following considerations apply for Amazon WAF:
You cannot associate an Amazon WAF web access control list (ACL) to the distribution for the first time.
You cannot disassociate an Amazon WAF web ACL from the distribution.
Before you can do the preceding tasks, you must delete the continuous deployment policy for your production distribution. This also deletes the staging distribution. For more information, see Use Amazon WAF protections.
Cases when CloudFront sends all requests to the primary distribution
In certain cases, such as periods of high resource utilization, CloudFront might send all requests to the primary distribution regardless of what's specified in the continuous deployment policy.
CloudFront sends all requests to the primary distribution during peak traffic hours, regardless of what's specified in the continuous deployment policy. Peak traffic refers to the traffic on the CloudFront service, and not the traffic on your distribution.
HTTP/3
You cannot use continuous deployment with a distribution that supports HTTP/3.