Next.js with AWS Lambda

This is a tiny example to show how to deploy the Next.js app on AWS Lambda using Apex Up.

• Post : https://moondaddi.dev/post/2019-01-11-Deploy-Nextjs-app-to-AWS-Lambda/

You may encounter the cold start issue, then refer to the lambda warmer. https://github.com/mattdamon108/lambda-warmer

• Post : https://moondaddi.dev/post/2019-03-23-how-to-warm-lambda-function/

Next.js app with custom server

The custom server for Next.js app is needed to run your app on AWS Lambda. In this example, express will be used.

// server.js

const express = require("express");
const next = require("next");

const port = parseInt(process.env.PORT, 10) || 3000;
const dev = process.env.NODE_ENV !== "production";
const app = next({ dev });
const handle = app.getRequestHandler();

app
  .prepare()
  .then(() => {
    const server = express();

    server.get("/", (req, res) => {
      return app.render(req, res, "/", req.params);
    });

    server.get("/about", (req, res) => {
      return app.render(req, res, "/about", req.params);
    });

    server.get("*", (req, res) => {
      return handle(req, res);
    });

    server.listen(port, err => {
      if (err) throw err;
      console.log(`> Ready on http://localhost:${port}`);
    });
  })
  .catch(ex => {
    console.log(ex);
    process.exit(1);
  });

update package.json with custom server.js

{
  "scripts": {
    "dev": "node server.js",
    "build": "next build",
    "start": "NODE_ENV=production node server.js"
  }
}

Install Apex Up

$ curl -sf https://up.apex.sh/install | sh

# verify the installation
$ up version

AWS credentials

You need to have one AWS account and recommend to use IAM with programmaic way for security and convinience. If you have already installed awscli or awsebcli, etc. You are having ~/.aws/credentials which is storing AWS credentials. It allows you to use AWS_PROFILE environment. If you don't please make one and save it with your account access key and security key in it.

# ~/.aws/credentials

[my-aws-account-for-lambda]
aws_access_key = xxxxxxxxxxxxx
aws_secret_access_key = xxxxxxxxxxxxxxxxxxxx

IAM policy for Up CLI

IAM policy allows the Up to access your AWS resources in order to deploy your Next.js app on Lambda. Go to AWS IAM and make the new policy and link it up to your AWS account.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "acm:*",
        "cloudformation:Create*",
        "cloudformation:Delete*",
        "cloudformation:Describe*",
        "cloudformation:ExecuteChangeSet",
        "cloudformation:Update*",
        "cloudfront:*",
        "cloudwatch:*",
        "ec2:*",
        "ecs:*",
        "events:*",
        "iam:AttachRolePolicy",
        "iam:CreatePolicy",
        "iam:CreateRole",
        "iam:DeleteRole",
        "iam:DeleteRolePolicy",
        "iam:GetRole",
        "iam:PassRole",
        "iam:PutRolePolicy",
        "lambda:AddPermission",
        "lambda:Create*",
        "lambda:Delete*",
        "lambda:Get*",
        "lambda:InvokeFunction",
        "lambda:List*",
        "lambda:RemovePermission",
        "lambda:Update*",
        "logs:Create*",
        "logs:Describe*",
        "logs:FilterLogEvents",
        "logs:Put*",
        "logs:Test*",
        "route53:*",
        "route53domains:*",
        "s3:*",
        "ssm:*",
        "sns:*"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "apigateway:*",
      "Resource": "arn:aws:apigateway:*::/*"
    }
  ]
}

Create up.json file

{
  "name": "nextjs-example",
  // aws account profile in ~/.aws/credentials
  "profile": "my-aws-account-for-lambda",
  "regions": ["ap-northeast-2"],
  "lambda": {
    // min 128, default 512
    "memory": 256,
    // AWS Lambda supports node.js 8.10 latest
    "runtime": "nodejs8.10"
  },
  "proxy": {
    "command": "npm start",
    "timeout": 25,
    "listen_timeout": 15,
    "shutdown_timeout": 15
  },
  "stages": {
    "development": {
      "proxy": {
        "command": "yarn dev"
      }
    }
  },
  "environment": {
    // you can hydrate env variables as you want.
    "NODE_ENV": "production"
  },
  "error_pages": {
    "variables": {
      "support_email": "[email protected]",
      "color": "#2986e2"
    }
  }
}

Build the Next.js app before deploy

$ yarn build

Create .upignore file

The Up will inspect your files to compose and deploy to lambda. Firstly The up will read .gitignore and ignore files written in .gitignore. And after that, .upignore will be read. The Up, by default, ignores dotfiles, so needs to negate .next directory in .upignore in order for the Up will build the package with it.

# .upignore

!.next

Deploy

$ up