Node.js 12 : Install2020/01/31 |
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Install Node.js 12.
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| [1] | Make sure the current enabled version of Node.js and Install it. |
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[root@dlp ~]# dnf module list nodejs CentOS-8 - AppStream Name Stream Profiles Summary nodejs 10 [d][e] common [d] [i], development, minimal, s2i Javascript runtime nodejs 12 common, development, minimal, s2i Javascript runtime Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled # if other versions are enabled, reset once and switch to the version [root@dlp ~]# dnf module reset nodejs [root@dlp ~]# dnf module enable nodejs:12
# update to Node.js 12 [root@dlp ~]# dnf module -y update nodejs:12
Dependencies resolved.
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Package
Arch Version Repo Size
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Upgrading:
nodejs x86_64 1:12.4.0-2.module_el8.1.0+251+8afea200 AppStream 9.8 M
npm x86_64 1:6.9.0-1.12.4.0.2.module_el8.1.0+251+8afea200 AppStream 3.8 M
Transaction Summary
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Upgrade 2 Packages
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[root@dlp ~]# node -v v12.4.0 # verify to create test script
[root@dlp ~]# cat > nodejs_test.js <<'EOF'
var http = require('http');
var server = http.createServer(function(req, res) {
res.write("Hello, This is the Node.js Simple Web Server!\n");
res.end();
}).listen(8080);
EOF
[root@dlp ~]#
node nodejs_test.js & [1] 3236
[root@dlp ~]#
[root@dlp ~]# curl localhost:8080 Hello, This is the Node.js Simple Web Server! kill 3236 |
| [2] | Create a sample chat apprication which WebSocket and SSL/TLS are implemented to verify working. For SSL certificate on this example, it uses the one from Let's enctypt. If Firewalld is running, allow port the apprication uses. (it's [1337] on this example) |
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[cent@dlp ~]$
npm install fs socket.io express
[cent@dlp ~]$
vi chat.js
var fs = require('fs');
var express = require('express');
var app = express();
var opts = {
key: fs.readFileSync('/etc/letsencrypt/live/dlp.srv.world/privkey.pem').toString(),
cert: fs.readFileSync('/etc/letsencrypt/live/dlp.srv.world/fullchain.pem').toString(),
};
var http = require('https').Server(opts, app);
var io = require('socket.io')(http, opts);
app.get('/', function(req, res){
res.sendFile(__dirname + '/index.html');
});
io.on('connection', function(socket){
socket.on('chat message', function(msg){
io.emit('chat message', msg);
});
});
http.listen(1337, function(){
console.log('listening on *:1337');
});
[root@dlp ~]#
vi index.html
<!DOCTYPE html>
<html>
<head>
<title>WebSocket Chat</title>
</head>
<body>
<form action="">
<input id="sendmsg" autocomplete="off" /><button>Send</button>
</form>
<ul id="messages" style="list-style-type: decimal; font-size: 16px; font-family: Arial;"></ul>
<script src="https://dlp.srv.world:1337/socket.io/socket.io.js"></script>
<script src="https://code.jquery.com/jquery.min.js"></script>
<script>
var socket = io('https://dlp.srv.world:1337');
$('form').submit(function(){
socket.emit('chat message', $('#sendmsg').val());
$('#sendmsg').val('');
return false;
});
socket.on('chat message', function(msg){
$('#messages').append($('<li style="margin-bottom: 5px;">').text(msg));
});
</script>
</body>
</html>
node chat.js listening on *:1337 |
| [3] | Access to the sample apprication to verify working normally. |
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