bun-deploy-a-bun-application-on-aws-lambda

name	Bun Deploy a Bun application on AWS Lambda
description	Deploy a Bun application on AWS Lambda

Deploy a Bun application on AWS Lambda

AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers.

In this guide, we will deploy a Bun HTTP server to AWS Lambda using a Dockerfile.

Before continuing, make sure you have:

• A Bun application ready for deployment
• An AWS account
• AWS CLI installed and configured
• Docker installed and added to your PATH

---

Make sure you're in the directory containing your project, then create a new `Dockerfile` in the root of your project. This file contains the instructions to initialize the container, copy your local project files into it, install dependencies, and start the application.

```docker Dockerfile icon="docker" theme={"theme":{"light":"github-light","dark":"dracula"}}
# Use the official AWS Lambda adapter image to handle the Lambda runtime
FROM public.ecr.aws/awsguru/aws-lambda-adapter:0.9.0 AS aws-lambda-adapter

# Use the official Bun image to run the application
FROM oven/bun:debian AS bun_latest

# Copy the Lambda adapter into the container
COPY --from=aws-lambda-adapter /lambda-adapter /opt/extensions/lambda-adapter

# Set the port to 8080. This is required for the AWS Lambda adapter.
ENV PORT=8080

# Set the work directory to `/var/task`. This is the default work directory for Lambda.
WORKDIR "/var/task"

# Copy the package.json and bun.lock into the container
COPY package.json bun.lock ./

# Install the dependencies
RUN bun install --production --frozen-lockfile

# Copy the rest of the application into the container
COPY . /var/task

# Run the application.
CMD ["bun", "index.ts"]
```

<Note>
  Make sure that the start command corresponds to your application's entry point. This can also be `CMD ["bun", "run", "start"]` if you have a start script in your `package.json`.

  This image installs dependencies and runs your app with Bun inside a container. If your app doesn't have dependencies, you can omit the `RUN bun install --production --frozen-lockfile` line.
</Note>

Create a new `.dockerignore` file in the root of your project. This file contains the files and directories that should be *excluded* from the container image, such as `node_modules`. This makes your builds faster and smaller:

```docker .dockerignore icon="Docker" theme={"theme":{"light":"github-light","dark":"dracula"}}
node_modules
Dockerfile*
.dockerignore
.git
.gitignore
README.md
LICENSE
.vscode
.env
# Any other files or directories you want to exclude
```

Make sure you're in the directory containing your `Dockerfile`, then build the Docker image. In this case, we'll call the image `bun-lambda-demo` and tag it as `latest`.

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
# cd /path/to/your/app
docker build --provenance=false --platform linux/amd64 -t bun-lambda-demo:latest .
```

To push the image to AWS Lambda, we first need to create an [ECR repository](https://aws.amazon.com/ecr/) to push the image to.

By running the following command, we:

* Create an ECR repository named `bun-lambda-demo` in the `us-east-1` region
* Get the repository URI, and export the repository URI as an environment variable. This is optional, but make the next steps easier.

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
export ECR_URI=$(aws ecr create-repository --repository-name bun-lambda-demo --region us-east-1 --query 'repository.repositoryUri' --output text)
echo $ECR_URI
```

```txt  theme={"theme":{"light":"github-light","dark":"dracula"}}
[id].dkr.ecr.us-east-1.amazonaws.com/bun-lambda-demo
```

<Note>
  If you're using IAM Identity Center (SSO) or have configured AWS CLI with profiles, you'll need to add the `--profile` flag to your AWS CLI commands.

  For example, if your profile is named `my-sso-app`, use `--profile my-sso-app`. Check your AWS CLI configuration with `aws configure list-profiles` to see available profiles.

  ```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
  export ECR_URI=$(aws ecr create-repository --repository-name bun-lambda-demo --region us-east-1 --profile my-sso-app --query 'repository.repositoryUri' --output text)
  echo $ECR_URI
  ```
</Note>

Log in to the ECR repository:

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin $ECR_URI
```

```txt  theme={"theme":{"light":"github-light","dark":"dracula"}}
Login Succeeded
```

<Note>
  If using a profile, use the `--profile` flag:

  ```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
  aws ecr get-login-password --region us-east-1 --profile my-sso-app | docker login --username AWS --password-stdin $ECR_URI
  ```
</Note>

Make sure you're in the directory containing your `Dockerfile`, then tag the docker image with the ECR repository URI.

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
docker tag bun-lambda-demo:latest ${ECR_URI}:latest
```

Then, push the image to the ECR repository.

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
docker push ${ECR_URI}:latest
```

Go to **AWS Console** > **Lambda** > [**Create Function**](https://us-east-1.console.aws.amazon.com/lambda/home?region=us-east-1#/create/function?intent=authorFromImage) > Select **Container image**

<Warning>Make sure you've selected the right region, this URL defaults to `us-east-1`.</Warning>

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</Frame>

Give the function a name, like `my-bun-function`.

Then, go to the **Container image URI** section, click on **Browse images**. Select the image we just pushed to the ECR repository.

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</Frame>

Then, select the `latest` image, and click on **Select image**.

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</Frame>

To get a public URL for the function, we need to go to **Additional configurations** > **Networking** > **Function URL**.

Set this to **Enable**, with Auth Type **NONE**.

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</Frame>

Click on **Create function** at the bottom of the page, this will create the function.

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</Frame>

Once the function has been created you'll be redirected to the function's page, where you can see the function URL in the **"Function URL"** section.

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</Frame>

🥳 Your app is now live! To test the function, you can either go to the **Test** tab, or call the function URL directly.

```bash terminal icon="terminal" theme={"theme":{"light":"github-light","dark":"dracula"}}
curl -X GET https://[your-function-id].lambda-url.us-east-1.on.aws/
```

```txt  theme={"theme":{"light":"github-light","dark":"dracula"}}
Hello from Bun on Lambda!
```