ubuntu installs docker to build npm development environment

Docker is an open source application container engine, based on the Go language and open source in compliance with the Apache2.0 protocol.

Docker allows developers to package their applications and dependent packages into a lightweight, portable container, and then publish it to any popular Linux machine, which can also be virtualized.

Containers use the sandbox mechanism completely, and there will be no interfaces between each other (apps similar to iPhone), and more importantly, the container performance overhead is extremely low.

Without further ado, let's install Docker now!

Update the source first:

After the three actions are completed, start to install docker.

apt install docker.io

An error will be reported at this time.

This is due to the installation of some dependent versions, we need to uninstall it first!

Next we continue to install:

List the available versions of Docker by typing the following in the terminal window:

View the current docker version:

Let's verify the hello word:

You can see which mirrors are currently available:

Next we have to install npm;

This process needs to wait for a while, when the installation is complete, we create a project:

Package.json content:

{
  "name": "nodejs-image-demo",
  "version": "1.0.0",
  "description": "nodejs image demo",
  "author": "Sammy the Shark <[email protected]>",
  "license": "MIT",
  "main": "app.js",
  "keywords": [
    "nodejs",
    "bootstrap",
    "express"
  ],
  "dependencies": {
    "express": "^4.16.4"
  }
}

Next install dependencies:

Prompt that nmp has the latest version, don't worry about it for now:

After installation, you will see the following directory:

This is the expansion pack:

Then we write app.js as follows:

const express = require('express');
const app = express();
const router = express.Router();

const path = __dirname + '/views/';
const port = 8080;

router.use(function (req,res,next) {
  console.log('/' + req.method);
  next();
});

router.get('/', function(req,res){
  res.sendFile(path + 'index.html');
});

router.get('/sharks', function(req,res){
  res.sendFile(path + 'sharks.html');
});

app.use(express.static(path));
app.use('/', router);

app.listen(port, function () {
  console.log('Example app listening on port 8080!')
})

Then write a view, put two files in it, index.html and sharks.html:

They are as follows:

<!DOCTYPE html>
<html lang="en">

<head>
    <title>About Sharks</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <link href="css/styles.css" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Merriweather:400,700" rel="stylesheet" type="text/css">
</head>

<body>
    <nav class="navbar navbar-dark bg-dark navbar-static-top navbar-expand-md">
        <div class="container">
            <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span>
            </button> <a class="navbar-brand" href="#">Everything Sharks</a>
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                <ul class="nav navbar-nav mr-auto">
                    <li class="active nav-item"><a href="/" class="nav-link">Home</a>
                    </li>
                    <li class="nav-item"><a href="/sharks" class="nav-link">Sharks</a>
                    </li>
                </ul>
            </div>
        </div>
    </nav>
    <div class="jumbotron">
        <div class="container">
            <h1>Want to Learn About Sharks?</h1>
            <p>Are you ready to learn about sharks?</p>
            <br>
            <p><a class="btn btn-primary btn-lg" href="/sharks" role="button">Get Shark Info</a>
            </p>
        </div>
    </div>
    <div class="container">
        <div class="row">
            <div class="col-lg-6">
                <h3>Not all sharks are alike</h3>
                <p>Though some are dangerous, sharks generally do not attack humans. Out of the 500 species known to researchers, only 30 have been known to attack humans.
                </p>
            </div>
            <div class="col-lg-6">
                <h3>Sharks are ancient</h3>
                <p>There is evidence to suggest that sharks lived up to 400 million years ago.
                </p>
            </div>
        </div>
    </div>
</body>

</html>

<!DOCTYPE html>
<html lang="en">

<head>
    <title>About Sharks</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <link href="css/styles.css" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Merriweather:400,700" rel="stylesheet" type="text/css">
</head>
<nav class="navbar navbar-dark bg-dark navbar-static-top navbar-expand-md">
    <div class="container">
        <button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span>
        </button> <a class="navbar-brand" href="/">Everything Sharks</a>
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav mr-auto">
                <li class="nav-item"><a href="/" class="nav-link">Home</a>
                </li>
                <li class="active nav-item"><a href="/sharks" class="nav-link">Sharks</a>
                </li>
            </ul>
        </div>
    </div>
</nav>
<div class="jumbotron text-center">
    <h1>Shark Info</h1>
</div>
<div class="container">
    <div class="row">
        <div class="col-lg-6">
            <p>
                <div class="caption">Some sharks are known to be dangerous to humans, though many more are not. The sawshark, for example, is not considered a threat to humans.
                </div>
                <img src="https://assets.digitalocean.com/articles/docker_node_image/sawshark.jpg" alt="Sawshark">
            </p>
        </div>
        <div class="col-lg-6">
            <p>
                <div class="caption">Other sharks are known to be friendly and welcoming!</div>
                <img src="https://assets.digitalocean.com/articles/docker_node_image/sammy.png" alt="Sammy the Shark">
            </p>
        </div>
    </div>
</div>

</html>

Then write a css file: views/css/styles.css

.navbar {
    margin-bottom: 0;
}

body {
    background: #020A1B;
    color: #ffffff;
    font-family: 'Merriweather', sans-serif;
}

h1,
h2 {
    font-weight: bold;
}

p {
    font-size: 16px;
    color: #ffffff;
}

.jumbotron {
    background: #0048CD;
    color: white;
    text-align: center;
}

.jumbotron p {
    color: white;
    font-size: 26px;
}

.btn-primary {
    color: #fff;
    text-color: #000000;
    border-color: white;
    margin-bottom: 5px;
}

img,
video,
audio {
    margin-top: 20px;
    max-width: 80%;
}

div.caption: {
    float: left;
    clear: both;
}

We open port 8080:

Then run app.js to start:

Visit via browser: http://192.168.0.200:8080/

You can see that it has been accessed normally!

ubuntu installs docker to build npm development environment

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