How to deploy a Node.js application to Amazon Web Services using Docker

<em>Plug: Originally published at Zeolearn&nbsp;</em><a href="https://www.zeolearn.com/magazine/how-to-deploy-a-node.js-application-to-amazon-web-services-using-docker" target="_blank"><em>magazine</em></a><em>.</em>

Plug: Originally published at Zeolearn magazine.

Table of Contents

1. Introduction

2. Prerequisites

3. A quick primer on Docker and AWS

4. What we’ll be deploying 

5. Creating a Dockerfile

6. Building a docker image

7. Running a docker container

8. Creating the Registry (ECR) and uploading the app image to it

9. Creating a new task definition

10. Creating a cluster

11. Creating a service to run it

12. Conclusion

1. Introduction

Writing code that does stuff is something most developers are familiar with. Sometimes, we need to take the responsibility of a SysAdmin or DevOps engineer and deploy our codebase to production where it will help a business solve problems for customers.

In this tutorial, I’ll show you how to dockerize a Node.js application and deploy it to Amazon Web Service (AWS) using Amazon ECR (Elastic Container Registry) and ECS (Elastic container service).

2. Prerequisites

To follow through this tutorial, you’ll need the following:


  1. Node and NpmFollow this link to install the latest versions.
  2. Basic knowledge of Node.js.
  3. Docker: The installation provides Docker Engine, Docker CLI client, and other cool stuff. Follow the instructions for your operating system. To check if the installation worked, fire this on the terminal:
docker --version

The command above should display the version number. If it doesn’t, the installation didn’t complete properly.

4. AWS account: Sign up for a free tier. There is a waiting period to verify your phone number and bank card. After this, you will have access to the console.

5. AWS CLI: Follow the instructions for your OS. You need Python installed.

3. A quick primer on Docker and AWS

Docker is an open source software that allows you to pack an application together with the required dependencies and environment in a ‘Container’ that you can ship and run anywhere. It is independent of platforms or hardware, and therefore the containerized application can run in any environment in an isolated fashion.

Docker containers solve many issues, such as when an app works on a co-worker’s computer but doesn’t run on yours, or it works in the local development environment but doesn’t work when you deploy it to a server.

Amazon Web Services (AWS) offers a reliable, scalable, and inexpensive cloud computing service for businesses. As I mentioned before, this tutorial will focus on using the ECR and ECS services.

4. What we’ll be deploying

Let’s quickly build a sample app that we’ll use for the purpose of this tutorial. It going to be very simple Node.js app.

Enter the following in your terminal:

// create a new directory
mkdir sample-nodejs-app
// change to new directory
cd sample-nodejs-app
// Initialize npm
npm init -y
// install express
npm install express
// create an server.js file
touch server.js


Open server.js and paste the code below into it:

// server.js
const express = require('express')
const app = express()
app.get('/', (req, res) => {
 res.send('Hello world from a Node.js app!')
})
app.listen(3000, () => {
 console.log('Server is up on 3000')
})

Start the app with:

node server.js

Access it on http://localhost:3000. You should get Hello world from a Node.js app! displayed in your browser. The complete code is available on GitHub.

Now let’s take our very important app to production 😄.

5. Creating a Dockerfile

We are going to start dockerizing the app by creating a single file called a Dockerfile in the base of our project directory.

The Dockerfile is the blueprint from which our images are built. And then images turn into containers, in which we run our apps.

Every Dockerfile starts with a base image as its foundation. There are two ways to approach creating your Dockerfile:

  1. Use a plain OS base image (For example, Ubuntu OS, Debian, CentOS etc.) and install an application environment in it such as Node.js OR
  2. Use an environment-ready base image to get an OS image with an application environment already installed.

We will proceed with the second approach. We can use the official Node.js image hosted on Dockerhub which is based on Alpine Linux.

Write this in the Dockerfile:

FROM node:8-alpine
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . .
RUN npm install
EXPOSE 3000
CMD [ "node", "server.js" ]

Let’s walk through this line by line to see what is happening here, and why.

FROM node:8-alpine

Here, we are building our Docker image using the official Node.js image from Dockerhub (a repository for base images).

  • Start our Dockerfile with a FROM statement. This is where you specify your base image.
  • The RUN statement will allow us to execute a command for anything you want to do. We created a subdirectory /usr/src/app that will hold our application code within the docker image.
  • WORKDIR instruction establishes the subdirectory we created as the working directory for any RUN, CMD, ENTRYPOINT, COPY and ADDinstructions that follow it in the Dockerfile. /usr/src/app is our working directory.
  • COPY lets us copy files from a source to a destination. We copied the contents of our node application code ( server.js and package.json) from our current directory to the working directory in our docker image.
  • The EXPOSE instruction informs Docker that the container listens on the specified network ports at runtime. We specified port 3000.
  • Last but not least, theCMD statement specifies the command to start our application. This tells Docker how to run your application. Here we use node server.js which is typically how files are run in Node.js.

With this completed file, we are now ready to build a new Docker image.

6. Building a docker image

Make sure you have Docker up and running. Now that we have defined our Dockerfile, let’s build the image with a title using -t:

docker build -t sample-nodejs-app .

This will output hashes, and alphanumeric strings that identify containers and images saying “Successfully built” on the last line:

Sending build context to Docker daemon  1.966MB
Step 1/7 : FROM node:6-alpine
 ---> 998971a692ca
Step 2/7 : RUN mkdir -p /usr/src/app
 ---> Using cache
 ---> f1aa1c112188
Step 3/7 : WORKDIR /usr/src/app
 ---> Using cache
 ---> b4421b83357b
Step 4/7 : COPY . .
 ---> 836112e1d526
Step 5/7 : RUN npm install
 ---> Running in 1c6b36b5381c
npm WARN [email protected] No description
npm WARN [email protected] No repository field.
Removing intermediate container 1c6b36b5381c
 ---> 93999e6c807f
Step 6/7 : EXPOSE 3000
 ---> Running in 7419020927f1
Removing intermediate container 7419020927f1
 ---> ed4ac8a31f83
Step 7/7 : CMD [ "node", "server.js" ]
 ---> Running in c77d34f4c873
Removing intermediate container c77d34f4c873
 ---> eaf97859f909
Successfully built eaf97859f909
// dont expect the same values from your terminal.


7. Running a Docker Container

We’ve built the docker image. To see previously created images, run:


docker images

You should see the image we just created as the most recent based on time:

Copy the image Id. To run the container, we write on the terminal:

docker run -p 80:3000 {image-id}
// fill with your image-id


By default, Docker containers can make connections to the outside world, but the outside world cannot connect to containers. -p publishes all exposed ports to the host interfaces. Here we publish the app to port 80:3000. Because we are running Docker locally, go to http://localhost to view.

At any moment, you can check running Docker containers by typing:

docker container ls

Finally, you can stop the container from running by:

docker stop {image-id}

Leave the Docker daemon running.

8. Create Registry (ECR) and upload the app image to it

Amazon Elastic Container Registry (ECR) is a fully-managed Docker container registry that makes it easy for developers to store, manage, and deploy Docker container images. Amazon ECR is integrated with Amazon Elastic Container Service (ECS), simplifying your development to production workflow.

The keyword “Elastic” means you can scale the capacity or reduce it as desired.

Steps:

  1. Go to the AWS console and sign in.
  2. Select the EC2 container service and Get started

3. The first run page shows, scroll down and click cancel > enter ECS dashboard.

4. To ensure your CLI can connect with your AWS account, run on the terminal:

aws configure

If your AWS CLI was properly installed, aws configure will ask for the following:

$ aws configure
AWS Access Key ID [None]: accesskey
AWS Secret Access Key [None]: secretkey
Default region name [None]: us-west-2
Default output format [None]:

Get the security credentials from your AWS account under your username > Access keys. Run aws configure again and fill correctly.

4. Create a new repository and enter a name (preferably with the same container name as in your local dev environment for consistency).

For example, use sample-nodejs-app.

Follow the 5 instructions from the AWS console for building, tagging, and pushing Docker images:

Note: The arguments of the following are mine and will differ from yours, so just follow the steps outlined on your console.

  1. Retrieve the Docker login command that you can use to authenticate your Docker client to your registry: 
  2. Note: If you receive an “Unknown options: - no-include-email” error, install the latest version of the AWS CLI. Learn more here.
aws ecr get-login --no-include-email --region us-east-2

2. Run the docker login command that was returned in the previous step (just copy and paste)Note: If you are using Windows PowerShell, run the following command instead:

Invoke-Expression -Command (aws ecr get-login --no-include-email --region us-east-2)

It should output: Login Succeeded.

3. Build your Docker image using the following command. For information on building a Docker file from scratch, see the instructions here. You can skip this step since our image is already built:

docker build -t sample-nodejs-app .

4. With a completed build, tag your image with a keyword (For example, latest) so you can push the image to this repository:

docker tag sample-nodejs-app:latest 559908478199.dkr.ecr.us-east-2.amazonaws.com/sample-nodejs-app:latest

5. Run the following command to push this image to your newly created AWS repository:

docker push 559908478199.dkr.ecr.us-east-2.amazonaws.com/sample-nodejs-app:latest

9. Create a new task definition

Tasks function like the docker run command of the Docker CLI but for multiple containers. They define:

  • Container images (to use)
  • Volumes (if any)
  • Networks Environment variables
  • Port mappings

From Task Definitions in the ECS dashboard, press on the Create new Task Definition (ECS) button:

Set a task name and use the following steps:

  • Add Container: sample-nodejs-app (the one we pushed).
  • Image: the URL to your container. Mine is 559908478199.dkr.ecr.us-east-2.amazonaws.com/sample-nodejs-app
  • Soft limit: 512
  • Map 80 (host) to 3000 (container) for sample-nodejs-app
  • Env Variables:

NODE_ENV: production

10. Create a Cluster

A cluster is the place where AWS containers run. They use configurations similar to EC2 instances. Define the following:

  • Cluster name: demo-nodejs-app-cluster
  • EC2 instance type: t2.micro

(Note: you select the instances based on the size of your application. Here we’ve selected the smallest. Your selection affects how much money you are billed at the end of the month. Visit here for more information). Thank you Nicholas Kolatsisfor pointing out that the previous selection of m4.large was expensive for this tutorial.

  • Number of instances: 1
  • EBS storage: 22
  • Key pair: None
  • VPC: New

When the process is complete, you may choose to click on “View cluster.”

11. Create a service to run it

Go to Task Definition > click demo-nodejs-app > click on the latest revision.

Inside of the task definition, click on the actions dropdown and select Create servcie

Use the following:

  • Launch type: EC2
  • Service name: demo-nodejs-app-service
  • Number of tasks: 1

Skip through options and click Create service and View service.

You’ll see its status as PENDING. Give it a little time and it will indicate RUNNING.

Go to Cluster (through a link from the service we just created) > EC2 instances > Click on the container instance to reveal the public DNS.

12. Conclusion.

Congrats on finishing this post! Grab the code for the Docker part from Github.


Feel free to support me (devapparel.co) and look good while at it. Also, Comment or Share this post. Thanks for reading!


By : Emmanuel Yusufu

Dockerizing a Node.js web application

Dockerizing a Node.js web application

In this article, we will see how to dockerize a Node.js application. Dockerizing a Node.js web application

Originally published by  ganeshmani009 at  cloudnweb.dev

what is docker ?

Firstly, Docker is containerization platform where developers can package the application and run as a container.

In simple words, docker runs each application as a separate environment which shares only the resources such as os, memory, etc.

Virtual Machine vs Docker

Docker and node.js setup

Here, we can find the difference between the docker and virtual machines.

To read more about docker, Docker Docs

we are gonna see how to dockerize a node.js application. before that, docker has to be installed on the machine. Docker Installation

After installing the docker, we need to initialize the node application.

npm init --yes
npm install express body-parser

the first command initializes the package.json file which contains the details about the application and dependencies. the second one install the express and bodyParser

create a file called server.js and paste the following code

'use strict';

const express = require('express');

// Constants
const PORT = 8080;
const HOST = '0.0.0.0';

// App
const app = express();
app.get('/', (req, res) => {
res.send('You have done it !!!!!\n');
});

app.listen(PORT,()=>{
console.log(Running on http://${HOST}:${PORT});
});

this runs the basic express application server. now, we need to create the docker image file. create a file name called Dockerfile and add the following commands

FROM node:8

First we install the node image from the Docker hub to the image

WORKDIR /usr/src/app

Next, we set the /usr/src/app as the working directory in the docker image

COPY package*.json ./
RUN npm install

then copies the package.json from the local machine to docker image. It’s not an efficient way to copy the dependencies from local to docker image.

so we are just copying the package.json and install all the dependencies in the docker image

COPY . .
EXPOSE 8080

CMD [ "npm" , "start" ]

it copies all the source code from local to docker image, binds the app to port 8080 in the docker image. docker image port 8080 can be mapped with local machine port. then we run the command

Your Dockerfile should now look like:

# this install the node image from docker hub
FROM node:8

this is the current working directory in the docker image

WORKDIR /usr/src/app
#copy package.json from local to docker image
COPY package*.json ./
#run npm install commands
RUN npm install
#copy all the files from local directory to docker image
COPY . .
#this port exposed to the docker to map.
EXPOSE 8080

CMD [ "npm" , "start" ]

create a .dockerignore file with the following content:

node_modules
npm-debug.log

now, we need to build our image in the command line as :

$ docker build -t <your username>/node-web-app .

-t flag used to tag a name to image. so, it will be easy to identify with a name instead of id. Note : dot in the end of command is important(else it won’t work)

we could run the image using the following command :

docker run -p 49160:8080 -d <your username>/node-web-app

we can check it using

 curl -i localhost:49160

output should be:

HTTP/1.1 200 OK
X-Powered-By: Express
Content-Type: text/html; charset=utf-8
Content-Length: 23
ETag: W/"17-C2jfoqVpuUrcmNFogd/3pZ5xds8"
Date: Mon, 08 Apr 2019 17:29:12 GMT
Connection: keep-alive

You have done it !!!!!

To read more

https://github.com/nodejs/docker-node/blob/master/docs/BestPractices.md

Originally published by  ganeshmani009 at  cloudnweb.dev

=============================

Thanks for reading

If you liked this post, share it with all of your programming buddies!

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Further reading

☞ The Complete Node.js Developer Course (3rd Edition)

☞ Angular & NodeJS - The MEAN Stack Guide

☞ NodeJS - The Complete Guide (incl. MVC, REST APIs, GraphQL)

☞ Best 50 Nodejs interview questions from Beginners to Advanced in 2019

☞ Node.js 12: The future of server-side JavaScript

☞ Docker for Absolute Beginners

☞ How to debug Node.js in a Docker container?

☞ Docker Containers for Beginners

☞ Deploy Docker Containers With AWS CodePipeline


Crafting multi-stage builds with Docker in Node.js

Crafting multi-stage builds with Docker in Node.js

Learn how you can use a multi-stage Docker build for your Node.js application. Docker multi-stage builds enable us to create more complex build pipelines without having to resort to magic tricks.

Everyone knows about Docker. It’s the ubiquitous tool for packaging and distribution of applications that seemed to come from nowhere and take over our industry! If you are reading this, it means you already understand the basics of Docker and are now looking to create a more complex build pipeline.

In the past, optimizing our Docker images has been a challenging experience. All sorts of magic tricks were employed to reduce the size of our applications before they went to production. Things are different now because support for multi-stage builds has been added to Docker.

In this post, we explore how you can use a multi-stage build for your Node.js application. For an example, we’ll use a TypeScript build process, but the same kind of thing will work for any build pipeline. So even if you’d prefer to use Babel, or maybe you need to build a React client, then a Docker multi-stage build can work for you as well.

A basic, single-stage Dockerfile for Node.js

Let’s start by looking at a basic Dockerfile for Node.js. We can visualize the normal Docker build process as shown in Figure 1 below.

Figure 1: Normal Docker build process.

We use the docker build command to turn our Dockerfile into a Docker image. We then use the docker run command to instantiate our image to a Docker container.

The Dockerfile in Listing 1 below is just a standard, run-of-the-mill Dockerfile for Node.js. You have probably seen this kind of thing before. All we are doing here is copying the package.json, installing production dependencies, copying the source code, and finally starting the application.

This Dockerfile is for regular JavaScript applications, so we don’t need a build process yet. I’m only showing you this simple Dockerfile so you can compare it to the multi-stage Dockerfile I’ll be showing you soon.

Listing 1: A run-of-the-mill Dockerfile for Node.js

FROM node:10.15.2

WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install --only=production
COPY ./src ./src
EXPOSE 3000
CMD npm start

Listing 1 is a quite ordinary-looking Docker file. In fact, all Docker files looked pretty much like this before multi-stage builds were introduced. Now that Docker supports multi-stage builds, we can visualize our simple Dockerfile as the single-stage build process illustrated in Figure 2.


Figure 2: A single-stage build pipeline.

The need for multiple stages

We can already run whatever commands we want in the Dockerfile when building our image, so why do we even need a multi-stage build?

To find out why, let’s upgrade our simple Dockerfile to include a TypeScript build process. Listing 2 shows the upgraded Dockerfile. I’ve bolded the updated lines so you can easily pick them out.

Listing 2: We have upgraded our simple Dockerfile to include a TypeScript build process

FROM node:10.15.2

WORKDIR /usr/src/app
COPY package*.json ./
COPY tsconfig.json ./
RUN npm install
COPY ./src ./src
RUN npm run build
EXPOSE 80
CMD npm start

We can easily and directly see the problem this causes. To see it for yourself, you should instantiate a container from this image and then shell into it and inspect its file system.

I did this and used the Linux tree command to list all the directories and files in the container. You can see the result in Figure 3.

Notice that we have unwittingly included in our production image all the debris of development and the build process. This includes our original TypeScript source code (which we don’t use in production), the TypeScript compiler itself (which, again, we don’t use in production), plus any other dev dependencies we might have installed into our Node.js project.


FIgure 3: The debris from development and the build process is bloating our production Docker image.
Bear in mind this is only a trivial project, so we aren’t actually seeing too much cruft left in our production image. But you can imagine how bad this would be for a real application with many sources files, many dev dependencies, and a more complex build process that generates temporary files!

We don’t want this extra bloat in production. The extra size makes our containers bigger. When our containers are bigger than needed, it means we aren’t making efficient use of our resources. The increased surface area of the container can also be a problem for security, where we generally prefer to minimize the attackable surface area of our application.

Wouldn’t it be nice if we could throw away the files we don’t want and just keep the ones we do want? This is exactly what a Docker multi-stage build can do for us.

Crafting a Dockerfile with a multi-stage build

We are going to split out Dockerfile into two stages. Figure 4 shows what our build pipeline looks like after the split.


Figure 4: A multi-stage Docker build pipeline to build TypeScript.

Our new multi-stage build pipeline has two stages: Build stage 1 is what builds our TypeScript code; Build stage 2 is what creates our production Docker image. The final Docker image produced at the end of this pipeline contains only what it needs and omits the cruft we don’t want.

To create our two-stage build pipeline, we are basically just going to create two Docker files in one. Listing 3 shows our Dockerfile with multiple stages added. The first FROM command initiates the first stage, and the second FROM command initiates the second stage.

Compare this to a regular single-stage Dockerfile, and you can see that it actually looks like two Dockerfiles squished together in one.

Listing 3: A multi-stage Dockerfile for building TypeScript code

# 
# Build stage 1.
# This state builds our TypeScript and produces an intermediate Docker image containing the compiled JavaScript code.
#
FROM node:10.15.2

WORKDIR /usr/src/app
COPY package*.json ./
COPY tsconfig.json ./
RUN npm install
COPY ./src ./src
RUN npm run build

#
# Build stage 2.
# This stage pulls the compiled JavaScript code from the stage 1 intermediate image.
# This stage builds the final Docker image that we'll use in production.
#
FROM node:10.15.2

WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install --only=production
COPY --from=0 /usr/src/app/build ./build
EXPOSE 80
CMD npm start

To create this multi-stage Dockerfile, I simply took Listing 2 and divided it up into separate Dockerfiles. The first stage contains only what is need to build the TypeScript code. The second stage contains only what is needed to produce the final production Docker image. I then merged the two Dockerfiles into a single file.

The most important thing to note is the use of --from in the second stage. I’ve bolded this line in Listing 3 so you can easily pick it out. This is the syntax we use to pull the built files from our first stage, which we refer to here as stage 0. We are pulling the compiled JavaScript files from the first stage into the second stage.

We can easily check to make sure we got the desired result. After creating the new image and instantiating a container, I shelled in to check the contents of the file system. You can see in Figure 5 that we have successfully removed the debris from our production image.


Figure 5: We have removed the debris of development from our Docker image.

We now have fewer files in our image, it’s smaller, and it has less surface area. Yay! Mission accomplished.

But what, specifically, does this mean?

The effect of the multi-stage build

What exactly is the effect of the new build pipeline on our production image?

I measured the results before and after. Our single-stage image produced by Listing 2 weighs in at 955MB. After converting to the multi-stage build in Listing 3, the image now comes to 902MB. That’s a reasonable reduction — we removed 53MB from our image!

While 53MB seems like a lot, we have actually only shaved off just more than 5 percent of the size. I know what you’re going to say now: But Ash, our image is still monstrously huge! There’s still way too much bloat in that image.

Well, to make our image even smaller, we now need to use the alpine, or slimmed-down, Node.js base image. We can do this by changing our second build stage from node:10.15.2 to node:10.15.2-alpine.

This reduces our production image down to 73MB — that’s a huge win! Now the savings we get from discarding our debris is more like a whopping 60 percent. Alright, we are really getting somewhere now!

This highlights another benefit of multi-stage builds: we can use separate Docker base images for each of our build stages. This means you can customize each build stage by using a different base image.

Say you have one stage that relies on some tools that are in a different image, or you have created a special Docker image that is custom for your build process. This gives us a lot of flexibility when constructing our build pipelines.

How does it work?

You probably already guessed this: each stage or build process produces its own separate Docker image. You can see how this works in Figure 6.

The Docker image produced by a stage can be used by the following stages. Once the final image is produced, all the intermediate images are discarded; we take what we want for the final image, and the rest gets thrown away.


Figure 6: Each stage of a multi-stage Docker build produces an image.

Adding more stages

There’s no need to stop at two stages, although that’s often all that’s needed; we can add as many stages as we need. A specific example is illustrated in Figure 7.

Here we are building TypeScript code in stage 1 and our React client in stage 2. In addition, there’s a third stage that produces the final image from the results of the first two stages.


Figure 7: Using a Docker multi-stage build, we can create more complex build pipelines.

Pro tips

Now time to leave you with a few advanced tips to explore on your own:

  1. You can name your build stages! You don’t have to leave them as the default 0, 1, etc. Naming your build stages will make your Dockerfile more readable.
  2. Understand the options you have for base images. Using the right base image can relieve a lot of confusion when constructing your build pipeline.
  3. Build a custom base image if the complexity of your build process is getting out of hand.
  4. You can pull from external images! Just like you pull files from earlier stages, you can also pull files from images that are published to a Docker repository. This gives you an option to pre-bake an early build stage if it’s expensive and doesn’t change very often.
Conclusion and resources

Docker multi-stage builds enable us to create more complex build pipelines without having to resort to magic tricks. They help us slim down our production Docker images and remove the bloat. They also allow us to structure and modularize our build process, which makes it easier to test parts of our build process in isolation.

So please have some fun with Docker multi-stage builds, and don’t forget to have a look at the example code on GitHub.

Here’s the Docker documentation on multi-stage builds, too.

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