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dokku/docs/appendices/file-formats/lambda-yml.md
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# lambda.yml
The `lambda.yml` file is used to configure a Lambda application.
```yaml
---
build_image: mlupin/docker-lambda:dotnetcore3.1-build
builder: dotnet
run_image: mlupin/docker-lambda:dotnetcore3.1
```
## Fields
`build_image`: A docker image that is accessible by the docker daemon. The `build_image` should be based on an existing Lambda image - builders may fail if they cannot run within the specified `build_image`. The build will fail if the image is inaccessible by the docker daemon.
`builder`: The name of a builder. This may be used if multiple builders match and a specific builder is desired. If an invalid builder is specified, the build will fail.
`run_image`: A docker image that is accessible by the docker daemon. The `run_image` should be based on an existing Lambda image - built images may fail to start if they are not compatible with the produced artifact. The generation of the `run_image` will fail if the image is inaccessible by the docker daemon.