1 00:00:04,530 --> 00:00:07,350 Blend for this next step is following the rules. 2 00:00:07,380 --> 00:00:14,340 We will create no GS Express Web application and we will configure our web server in such a way that 3 00:00:14,340 --> 00:00:21,730 it will respond with the hostname of the server when we connect to it using a route URL and in such 4 00:00:21,730 --> 00:00:27,300 a way we will be able to distinguish which bot actually answers specific request. 5 00:00:28,290 --> 00:00:36,240 We will also tokenize such application using a docker file and docker build command and afterwards push 6 00:00:36,240 --> 00:00:38,430 build docker image to Docker hub. 7 00:00:38,760 --> 00:00:47,100 And finally we will create deployment using such custom built image, you could find all final project 8 00:00:47,100 --> 00:00:49,050 files in the GitHub repository. 9 00:00:49,050 --> 00:00:54,690 You will find link to it right now here, but I highly recommend to you to create such an application 10 00:00:54,690 --> 00:00:59,370 yourself, even if you don't know much about no GPRS and express. 11 00:00:59,370 --> 00:01:06,060 And of course I recommend to you to build your custom image and push it to your Docker hub account. 12 00:01:06,060 --> 00:01:09,840 Of course you could utilize images available under my account. 13 00:01:09,840 --> 00:01:10,860 They are public. 14 00:01:10,860 --> 00:01:12,000 It's up to you. 15 00:01:12,150 --> 00:01:14,970 So let's now open a Visual Studio code. 16 00:01:14,970 --> 00:01:17,220 If you don't have it, please install it. 17 00:01:17,250 --> 00:01:18,660 I'll open it up. 18 00:01:19,350 --> 00:01:25,320 And here in the Visual Studio code, please open up, embed a terminal press key combination control 19 00:01:25,320 --> 00:01:33,720 back like that terminal was opened and now let's create folder for our project files LCD to desktop 20 00:01:33,960 --> 00:01:41,880 and here using make directory command I'll create folder k8s stands for Kubernetes as you already know. 21 00:01:41,910 --> 00:01:50,820 Let's see it to k8s folder and you could open any folder using code dot command if you correctly installed 22 00:01:50,850 --> 00:01:52,020 Visual Studio code. 23 00:01:52,050 --> 00:01:58,260 If such a command is not available on your computer, you could press key combination command shift 24 00:01:58,290 --> 00:02:06,930 P or control shift p on windows and here enter code and select shell command install code command in 25 00:02:06,930 --> 00:02:12,450 path and afterwards Code Command will be available from any terminal. 26 00:02:12,450 --> 00:02:16,020 So I have this command already available in the path. 27 00:02:16,020 --> 00:02:19,770 That's why I'll open k8s folder in the Visual Studio. 28 00:02:19,770 --> 00:02:21,690 Code Editor So code dot. 29 00:02:22,900 --> 00:02:26,530 It will be opened in the new window like that. 30 00:02:26,620 --> 00:02:30,680 Now this folder is completely empty and has no files. 31 00:02:30,700 --> 00:02:31,960 Let me again open. 32 00:02:31,960 --> 00:02:36,520 And by the terminal here it will be opened in k8s folder. 33 00:02:36,520 --> 00:02:40,600 And now here let's create folder for our first project. 34 00:02:40,810 --> 00:02:45,370 And this folder name will be, let's say k8s. 35 00:02:46,000 --> 00:02:47,810 That's Web desk. 36 00:02:47,830 --> 00:02:48,410 Hello. 37 00:02:48,430 --> 00:02:55,480 Because we will build very basic web application which will simply respond hello from server and server 38 00:02:55,480 --> 00:02:55,920 name. 39 00:02:55,930 --> 00:02:57,660 So k8s web. 40 00:02:57,670 --> 00:02:58,240 Hello. 41 00:02:58,630 --> 00:03:03,280 And here in this folder we will create Node.js application. 42 00:03:03,400 --> 00:03:06,970 Let's here in the terminal city to k8s web. 43 00:03:07,000 --> 00:03:07,880 Hello folder. 44 00:03:07,900 --> 00:03:08,620 Like that. 45 00:03:08,920 --> 00:03:13,120 And here first we will initialize node g's application. 46 00:03:13,120 --> 00:03:17,030 And in order to do so, you have to install NPM on your computer. 47 00:03:17,050 --> 00:03:24,340 If you don't have no g's and and PM available, please go to Node.js download. 48 00:03:26,450 --> 00:03:27,710 Here is a link. 49 00:03:27,740 --> 00:03:32,360 Download Node.js and install Node.js on your computer. 50 00:03:32,390 --> 00:03:35,390 It will be installed along with an RPM. 51 00:03:35,630 --> 00:03:41,270 Of course, we will not run applications using Node.js on our computers. 52 00:03:41,450 --> 00:03:47,720 We will run application inside of the container in the Kubernetes cluster instead. 53 00:03:47,900 --> 00:03:55,360 But in order to initialize project locally and install dependencies, you have to use NPM. 54 00:03:55,370 --> 00:04:02,360 So therefore please install node.js along with NPM afterwards and PM should become available on your 55 00:04:02,360 --> 00:04:03,080 computer. 56 00:04:03,110 --> 00:04:05,330 I'll hide this back pain. 57 00:04:05,900 --> 00:04:12,110 And now here let me and PM in it and I'll initialize this project. 58 00:04:12,110 --> 00:04:18,200 And you could add here optional dash y which will skip all answers to you during initialization of the 59 00:04:18,200 --> 00:04:19,670 new Node.js project. 60 00:04:19,670 --> 00:04:21,470 So in PM init that's why. 61 00:04:22,960 --> 00:04:24,880 New project was initialized. 62 00:04:24,880 --> 00:04:32,050 And here you should find now package the JSON file with such contents, name of the project version 63 00:04:32,050 --> 00:04:32,890 and so on. 64 00:04:33,070 --> 00:04:39,820 And now let's install package called express and PM install express. 65 00:04:41,720 --> 00:04:48,080 It will be downloaded from the NPM registry package was installed and packaged. 66 00:04:48,080 --> 00:04:53,210 The JSON file was updated here was now dependency called express. 67 00:04:53,780 --> 00:05:01,730 So now let's create index the GS file in our K eight web hello folder. 68 00:05:01,760 --> 00:05:07,520 By the way, notice that now there is no modules folder which contains all dependencies of our project, 69 00:05:07,520 --> 00:05:11,030 but now it is safe to simply remove this folder. 70 00:05:11,030 --> 00:05:16,580 We don't need it anymore because we will not run this project locally with help of Node. 71 00:05:16,580 --> 00:05:19,610 So simply select this folder and delete. 72 00:05:20,770 --> 00:05:21,320 All right. 73 00:05:21,430 --> 00:05:25,330 Now we have only package the JSON and package log the JSON files. 74 00:05:25,540 --> 00:05:26,060 Great. 75 00:05:26,080 --> 00:05:31,660 Now let's create file and we will create it inside of the k8s web hello folder. 76 00:05:31,660 --> 00:05:38,080 So new file and let's name it index dot m j is why? 77 00:05:38,080 --> 00:05:46,260 M because we will utilize ES6 modules syntax which is available in Node.js starting from version 13. 78 00:05:46,270 --> 00:05:52,780 And if you would like to use import statements instead of the required statements, you have to name 79 00:05:52,780 --> 00:05:55,330 files with extension images. 80 00:05:55,330 --> 00:06:03,640 So let's create file index dot GHS and here I will not type the contents of entire application. 81 00:06:03,640 --> 00:06:07,210 I will simply copy them in order to save some time. 82 00:06:07,390 --> 00:06:13,930 So paste here if you would like you could of course write this very tiny application yourself. 83 00:06:13,930 --> 00:06:16,960 So we import Express from express package. 84 00:06:16,960 --> 00:06:19,300 We also import OS from OS. 85 00:06:19,300 --> 00:06:28,270 OS is built in Node.js module and afterwards we create express application here export 3000. 86 00:06:28,270 --> 00:06:34,120 You could specify any other port if you would like, and that's that port where our express web server 87 00:06:34,120 --> 00:06:36,520 will be running inside of the container. 88 00:06:36,970 --> 00:06:41,740 Here we are adding root handler from slash URL. 89 00:06:41,740 --> 00:06:48,070 It is a root URL and we simply answer to the client with text. 90 00:06:48,100 --> 00:06:48,580 Hello. 91 00:06:48,580 --> 00:06:56,860 From the os host name using OS package, we retrieve hostname of the server and in the response from 92 00:06:56,860 --> 00:07:03,730 the server you will see simply text message hello from there and name of the server where this application 93 00:07:03,730 --> 00:07:04,570 is running. 94 00:07:04,870 --> 00:07:06,010 So rest sent. 95 00:07:06,010 --> 00:07:14,440 We send to the client such message and also we log it to the console and finally we start express web 96 00:07:14,440 --> 00:07:16,180 server object lesson. 97 00:07:16,180 --> 00:07:23,650 And we started at this broad 3000 and when server starts we will look to the console message. 98 00:07:23,650 --> 00:07:26,770 Web server is listening at port and here respond. 99 00:07:27,220 --> 00:07:34,270 I will not dive deeper into the explanations and syntax of Node.js because it is not Node.js course. 100 00:07:34,270 --> 00:07:35,650 But you get an idea. 101 00:07:35,650 --> 00:07:41,230 We create very basic web server which will respond with such text message.