1 00:00:02,130 --> 00:00:06,300 Now to create this utility container, I need my own image. 2 00:00:06,300 --> 00:00:08,620 And therefore I'll add a Docker file. 3 00:00:08,620 --> 00:00:11,930 Now I wanna start based on node again. 4 00:00:11,930 --> 00:00:16,079 And I will actually pick a specific node version here, 5 00:00:16,079 --> 00:00:19,070 I'll use the 14 dash Alpine version, 6 00:00:19,070 --> 00:00:21,790 that's still node version 14, 7 00:00:21,790 --> 00:00:25,610 but it's using an extra slim operating system layer 8 00:00:25,610 --> 00:00:26,450 under the hood. 9 00:00:26,450 --> 00:00:29,040 So it will simply be a smaller node image. 10 00:00:29,040 --> 00:00:31,540 Of course, we could also just use node. 11 00:00:31,540 --> 00:00:33,970 But since I want to build a utility container, 12 00:00:33,970 --> 00:00:36,420 I want an extra slim setup here. 13 00:00:36,420 --> 00:00:38,380 So I'll use this Alpine version, 14 00:00:38,380 --> 00:00:43,030 which is this very slim and optimized node base image. 15 00:00:43,030 --> 00:00:45,690 Now with that, we can add a working directory 16 00:00:45,690 --> 00:00:49,470 and set this to app, for example, to define 17 00:00:49,470 --> 00:00:52,190 which folder will be used by commands 18 00:00:52,190 --> 00:00:54,920 executed on this container and on this image, 19 00:00:54,920 --> 00:00:59,580 and that includes commands you entered with Docker run, 20 00:00:59,580 --> 00:01:01,490 anything which you enter after the image name 21 00:01:01,490 --> 00:01:05,099 will also run against this default working directory. 22 00:01:05,099 --> 00:01:07,560 And then we could specify a starting command here, 23 00:01:07,560 --> 00:01:10,160 for example, NPM init. 24 00:01:10,160 --> 00:01:14,710 But I want to make my project here more flexible than that, 25 00:01:14,710 --> 00:01:17,710 I don't want to restrict this image to just being able 26 00:01:17,710 --> 00:01:20,560 to run the init command, 27 00:01:20,560 --> 00:01:25,240 I want to give the user full control over this image 28 00:01:25,240 --> 00:01:28,920 and allow the user to run any command against this image. 29 00:01:28,920 --> 00:01:31,170 So I'll just save it like this. 30 00:01:31,170 --> 00:01:36,170 And then I'll build this and give it a tag of node util 31 00:01:36,310 --> 00:01:37,653 for node utility. 32 00:01:39,230 --> 00:01:42,950 And this will now download this node Alpine image, 33 00:01:42,950 --> 00:01:47,540 which is super small as you can tell only 35 megabytes here, 34 00:01:47,540 --> 00:01:50,210 and it will then build this. 35 00:01:50,210 --> 00:01:55,210 And thereafter, we can Docker run our node util, image, 36 00:01:56,530 --> 00:01:59,440 and then for example, pass in NPM init. 37 00:02:00,600 --> 00:02:03,610 Now, again, we need to do this in interactive mode, 38 00:02:03,610 --> 00:02:07,350 to stay connected and to be able to enter values. 39 00:02:07,350 --> 00:02:10,400 But I also wanna do more than that, by default, 40 00:02:10,400 --> 00:02:12,690 this command would run in the app folder 41 00:02:12,690 --> 00:02:14,370 inside of the container. 42 00:02:14,370 --> 00:02:19,160 Now I want to mirror it to my local folder 43 00:02:19,160 --> 00:02:21,880 so that what I create in the container 44 00:02:21,880 --> 00:02:25,200 is also available here on my host machine. 45 00:02:25,200 --> 00:02:28,470 So that I can create a project on my host machine 46 00:02:28,470 --> 00:02:30,240 with help of a container. 47 00:02:30,240 --> 00:02:33,290 That's the idea behind having a utility container, 48 00:02:33,290 --> 00:02:35,820 we can use it to execute something 49 00:02:35,820 --> 00:02:38,300 which has an effect on the host machine 50 00:02:38,300 --> 00:02:41,150 without having to install all the extra tools 51 00:02:41,150 --> 00:02:42,870 on the host machine. 52 00:02:42,870 --> 00:02:44,700 And we can use a feature for that, 53 00:02:44,700 --> 00:02:47,730 which we already used many times before in the course, 54 00:02:47,730 --> 00:02:50,980 we can use a bind mount with dash v here. 55 00:02:50,980 --> 00:02:53,540 And I can bind my folder here 56 00:02:53,540 --> 00:02:56,870 to the working directory I have in there. 57 00:02:56,870 --> 00:03:00,033 So I'll just copy this path here. 58 00:03:01,663 --> 00:03:05,710 And specify unspecified that without the file name, 59 00:03:05,710 --> 00:03:08,400 and then a colon and then the path inside 60 00:03:08,400 --> 00:03:11,293 of the container/app, 61 00:03:12,190 --> 00:03:13,650 which is the working directory 62 00:03:13,650 --> 00:03:15,393 in which NPM init will run. 63 00:03:16,920 --> 00:03:20,580 And now if we hit enter, we start this container. 64 00:03:20,580 --> 00:03:23,910 Now we have to fill out these questions 65 00:03:23,910 --> 00:03:25,430 we have to provide answers, 66 00:03:25,430 --> 00:03:28,950 we can use some default values here if you want to. 67 00:03:28,950 --> 00:03:32,210 And once we're done, you see the package JSON file appear 68 00:03:32,210 --> 00:03:34,480 here on my host machine. 69 00:03:34,480 --> 00:03:37,370 So in this project folder on my host machine, 70 00:03:37,370 --> 00:03:39,180 because of this bind mount, 71 00:03:39,180 --> 00:03:42,980 we're sharing our host machine folder here 72 00:03:42,980 --> 00:03:45,750 with the folder inside of the container. 73 00:03:45,750 --> 00:03:48,940 And commands which we execute inside of the container 74 00:03:48,940 --> 00:03:52,750 inside of this shared folder they offer also have an effect 75 00:03:52,750 --> 00:03:54,840 on our host machine. 76 00:03:54,840 --> 00:03:57,870 And now I could totally uninstalled node 77 00:03:57,870 --> 00:04:00,550 and NPM on my host machine. 78 00:04:00,550 --> 00:04:04,410 And I could still create projects with help of NPM init 79 00:04:04,410 --> 00:04:07,970 with help of this utility container. 80 00:04:07,970 --> 00:04:12,560 And that might sound like a constructed or dumb scenario. 81 00:04:12,560 --> 00:04:15,290 But actually it can be really useful 82 00:04:15,290 --> 00:04:17,839 that you don't have to install all these extra tools 83 00:04:17,839 --> 00:04:18,940 on your machine. 84 00:04:18,940 --> 00:04:20,829 For node It's not too bad. 85 00:04:20,829 --> 00:04:24,950 It's just one tool node JS But for Laravel and PHP, 86 00:04:24,950 --> 00:04:27,610 as I mentioned, it will be way more complex. 87 00:04:27,610 --> 00:04:29,380 And I'll come back to that example 88 00:04:29,380 --> 00:04:32,900 and show you a Laravel PHP setup with help of Docker 89 00:04:32,900 --> 00:04:34,720 once we're done with this section, 90 00:04:34,720 --> 00:04:37,083 because that will always be quite interesting. 91 00:04:38,010 --> 00:04:41,080 But as I just said once we're done with this section, 92 00:04:41,080 --> 00:04:44,460 because there actually are a couple of other neat features 93 00:04:44,460 --> 00:04:47,770 which can make working with such utility containers 94 00:04:47,770 --> 00:04:49,023 more convenient.