Скачать или смотреть #30 Lambda Function Aliases Overview | AWS Serverless

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Lambda function aliases in AWS Lambda are a powerful feature that allows you to manage different versions of a Lambda function under the same function name. An alias is a pointer to a specific Lambda function version, and it can be used to simplify the management and invocation of different versions of your function.

Key Features of Lambda Function Aliases:

1. *Pointing to Specific Versions:*
An alias can point to any version of a Lambda function. This means you can have a stable reference (alias) for your function, regardless of the underlying version changes.

2. *Simple Invocation:*
When invoking a Lambda function, you can use an alias name instead of a version number. This simplifies the process of invoking different versions of a function for different environments (like development, testing, or production).

3. *Promoting Versions:*
Easily promote a Lambda function from one stage to another (like from testing to production) by updating the alias to point to a different version.

4. *Traffic Shifting:*
Lambda aliases support weighted traffic shifting. This feature allows you to gradually shift traffic from one function version to another, which is helpful for A/B testing and gradual deployments.

5. *Blue/Green Deployments:*
By using aliases with weighted traffic shifting, you can implement blue/green deployment strategies for your Lambda functions.

Using Lambda Function Aliases:

1. *Create a Function Version:*
Before creating an alias, you need to publish a version of your Lambda function.

2. *Create an Alias:*
In the AWS Lambda console or via the AWS CLI, create an alias and point it to the published version of your Lambda function.
For example, create an alias named `PROD` that points to version `1` of your function.

3. *Update Alias:*
As you publish new versions of your function, you can update the alias to point to these new versions without changing the clients that invoke your function.

4. *Invoke the Function Using Alias:*
Use the alias name to invoke the function, rather than the version number. For instance, clients can continue to use the `PROD` alias even as the underlying version changes.

Example:

Suppose you have a Lambda function `my-function`. You publish version `1` and then create an alias `PROD` pointing to this version. Later, you publish version `2` of your function and update the `PROD` alias to point to the new version. Clients invoking `my-function:PROD` will now be invoking version `2`, without any change on their side.

Lambda function aliases are particularly useful in managing function versions in production environments, providing a way to implement advanced deployment strategies and manage functions more effectively.