Lambda runtimes - AWS Lambda

Lambda runtimes

Lambda supports multiple languages through the use of runtimes. For a function defined as a container image, you choose a runtime and the Linux distribution when you create the container image. To change the runtime, you create a new container image.

When you use a .zip file archive for the deployment package, you choose a runtime when you create the function. To change the runtime, you can update your function's configuration. The runtime is paired with one of the Amazon Linux distributions. The underlying execution environment provides additional libraries and environment variables that you can access from your function code.

Amazon Linux

Amazon Linux 2

  • Image – Custom

  • Linux kernel – 4.14.165-102.205.amzn2.x86_64

Lambda invokes your function in an execution environment. The execution environment provides a secure and isolated runtime environment that manages the resources required to run your function. Lambda re-uses the execution environment from a previous invocation if one is available, or it can create a new execution environment.

A runtime can support a single version of a language, multiple versions of a language, or multiple languages. Runtimes specific to a language or framework version are deprecated when the version reaches end of life.

Node.js runtimes
Name Identifier SDK for JavaScript Operating system Architectures

Node.js 14

nodejs14.x

2.1001.0

Amazon Linux 2

x86_64, arm64

Node.js 12

nodejs12.x

2.1001.0

Amazon Linux 2

x86_64, arm64

Node.js 10

nodejs10.x

2.1001.0

Amazon Linux 2

x86_64

Note

For end of support information about Node.js 10, see Runtime support policy.

Python runtimes
Name Identifier AWS SDK for Python Operating system Architectures

Python 3.9

python3.9

boto3-1.18.55 botocore-1.21.55

Amazon Linux 2

x86_64, arm64

Python 3.8

python3.8

boto3-1.18.55 botocore-1.21.55

Amazon Linux 2

x86_64, arm64

Python 3.7

python3.7

boto3-1.18.55 botocore-1.21.55

Amazon Linux

x86_64

Python 3.6

python3.6

boto3-1.18.55 botocore-1.21.55

Amazon Linux

x86_64

Python 2.7

python2.7

boto3-1.17.100 botocore-1.20.100

Amazon Linux

x86_64

Important

Python 2.7 reached end of life on January 1, 2020. End of support (phase 1) for the Python 2.7 runtime started on July 15, 2021. For more information, see Announcing end of support for Python 2.7 in AWS Lambda on the AWS Compute Blog.

Ruby runtimes
Name Identifier SDK for Ruby Operating system Architectures

Ruby 2.7

ruby2.7

3.0.1

Amazon Linux 2

x86_64, arm64

Ruby 2.5

ruby2.5

3.0.1

Amazon Linux

x86_64

Note

For end of support information about Ruby 2.5, see Runtime support policy.

Java runtimes
Name Identifier JDK Operating system Architectures

Java 11

java11

amazon-corretto-11

Amazon Linux 2

x86_64, arm64

Java 8

java8.al2

amazon-corretto-8

Amazon Linux 2

x86_64, arm64

Java 8

java8

amazon-corretto-8

Amazon Linux

x86_64

Go runtimes
Name Identifier Operating system Architectures

Go 1.x

go1.x

Amazon Linux

x86_64

Note

Runtimes that use the Amazon Linux operating system, such as Go 1.x, do not support the arm64 architecture. To use arm64 architecture, you can run Go with the provided.al2 runtime.

.NET runtimes
Name Identifier Operating system Architectures

.NET Core 3.1

dotnetcore3.1

Amazon Linux 2

x86_64, arm64

.NET Core 2.1

dotnetcore2.1

Amazon Linux

x86_64

Note

For end of support information about .NET Core 2.1, see Runtime support policy.

To use other languages in Lambda, you can implement a custom runtime. The Lambda execution environment provides a runtime interface for getting invocation events and sending responses. You can deploy a custom runtime alongside your function code, or in a layer.

Custom runtime
Name Identifier Operating system Architectures

Custom Runtime

provided.al2

Amazon Linux 2

x86_64, arm64

Custom Runtime

provided

Amazon Linux

x86_64