How to Deploy Next.js App to AWS EC2 in Production and Set up CI/CD with Github Actions

Yo!
In this article, we are going through deploying a Next.js app to AWS EC2 and set up continuous integration & deployment by means of Github Actions.
Before proceeding, you will need the infrastructure ready on AWS, which can be deployed manually or by Terraform code. I'm skipping the infra part for the purpose of this article.

First things first, we need to ssh into the ec2 instance. Once you logged in, run this script to install Node.js on the machine:

Now you can install yarn and pm2 globally:

1source ~/.bashrc
2npm install -g yarn pm2

The next step is to clone your Next.js app repo and cd to the project root directory. To automate the subsequent git pull commands, we are going to create a ssh key pair and use it.
Create a classic ssh key pair(without a passphrase) first:

1cd ~/.ssh
2ssh-keygen -t rsa -b 4096 -C "[email protected]"

Use github when you are asked for a file name, then you will have two files github and github.pub in the ~/.ssh directory.
Add the public key to authorized_keys:

1cat ~/.ssh/github.pub >> authorized_keys

Add the private key to Deploy Keys section in your github repo settings.

1cat ~/.ssh/github

Now you are ready to clone the repo in ssh mode! Phew~

1cd ~
2git clone [email protected]:username/awesome-nextapp.git

Install dependencies and build the next app, and run it in production mode with pm2.

1cd ~/awesome-nextapp
2yarn install
3yarn build
4pm2 start npm --name "nextapp" -- start

Your next.js website should be up and running at this point.

1curl localhost:3000

Create ~/deploy.sh to use in Github Actions.

1#!/bin/bash
2# use the correct node version for below path
3PATH="$PATH:/home/ubuntu/.nvm/versions/node/v16.13.2/bin/"
4cd ~/awesome-nextapp
5git pull
6yarn install
7yarn build
8pm2 restart nextapp

Try and run the script.

1bash deploy.sh

If you verified the script ran successfully, you are very awesome!

Now, let's move on with settig up Github Actions. The first thing we need to do is to create a yaml file for it.

1cd ~/awesome-nextapp
2mkdir .github && mkdir -p .github/workflows
3touch .github/workflows/frontend.yml

Copy and paste below content.

 1name: Frontend Next.js CI
 2
 3# on: [push]
 4on:
 5  push:
 6    branches: [ main ]
 7  pull_request:
 8    branches: [ main ]
 9
10jobs:
11  build:
12
13    runs-on: ubuntu-latest
14
15    strategy:
16      matrix:
17        node-version: [16.x]
18
19    steps:
20      - name: Checkout the repo
21        uses: actions/[email protected]
22      - name: Use Node.js ${{ matrix.node-version }}
23        uses: actions/[email protected]
24        with:
25          node-version: ${{ matrix.node-version }}
26      - name: Install yarn
27        run: npm install -g yarn
28      - name: Get yarn cache directory path
29        id: yarn-cache-dir-path
30        run: echo "::set-output name=dir::$(yarn cache dir)"
31      - uses: actions/[email protected]
32        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
33        with:
34          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
35          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
36          restore-keys: |
37            ${{ runner.os }}-yarn-
38      - uses: actions/[email protected]
39        with:
40          path: '**/node_modules'
41          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
42      - name: Install deps
43        working-directory: .
44        if: steps.yarn-cache.outputs.cache-hit != 'true'
45        run: yarn install
46      - name: Check codebase
47        working-directory: .
48        run: yarn build
49
50  deploy:
51
52    needs: build
53    runs-on: ubuntu-latest
54
55    steps:
56      - name: Install SSH Key
57        uses: shimataro/[email protected]
58        with:
59          key: ${{ secrets.SSH_PRIVATE_KEY }}
60          known_hosts: 'placeholder'
61      - name: Adding Known Hosts
62        run: ssh-keyscan -H ${{ secrets.FE_SERVER_IP }} >> ~/.ssh/known_hosts
63      - name: Run deploy script
64        run: ssh [email protected]${{ secrets.FE_SERVER_IP }} bash deploy.sh

Go to your repo Settings -> Secrets -> Actions secrets and add two secrets:

SSH_PRIVATE_KEY can be grabbed by cat ~/.ssh/github on the server
FE_SERVER_IP can be grabbed by curl ipinfo.io/ip on the server

Commit the workflow file in the repo and push it, and see how the workflow runs in Actions tab of your repo.
Setting up CI/CD right usually takes some efforts and experiments, if you followed through thus far, that's so cool.
If you are curious about deploying the whole infrastructure(vpc-ec2-alb-acm-route53-s3) as code in Terraform, email me - dockerlead at gmail dot com.

Happy coding! ๐Ÿ˜Ž

comments powered by Disqus