1 00:00:02,120 --> 00:00:03,810 In the last course module, 2 00:00:03,810 --> 00:00:05,740 we combined multiple containers 3 00:00:05,740 --> 00:00:09,010 to build one application consisting of a backend, 4 00:00:09,010 --> 00:00:11,533 which was a Node express API, 5 00:00:11,533 --> 00:00:15,230 a frontend, which was a React single page application 6 00:00:15,230 --> 00:00:17,720 and a Mongo Db database. 7 00:00:17,720 --> 00:00:21,530 We built this application by launching three containers, 8 00:00:21,530 --> 00:00:22,600 one for the database, 9 00:00:22,600 --> 00:00:23,433 one for the backend, 10 00:00:23,433 --> 00:00:24,710 one for the front end. 11 00:00:24,710 --> 00:00:28,060 We ensured that these containers could communicate 12 00:00:28,060 --> 00:00:30,410 with each other in different ways 13 00:00:30,410 --> 00:00:33,270 and of course we also added extra features 14 00:00:33,270 --> 00:00:38,270 like persistent data, live source code updates and so on. 15 00:00:38,490 --> 00:00:41,800 Now, the problem I have with the setup 16 00:00:41,800 --> 00:00:45,310 we created in the last module is this. 17 00:00:45,310 --> 00:00:48,750 I wrote down all the code docker commands 18 00:00:48,750 --> 00:00:52,700 we need to run to bring this setup to live. 19 00:00:52,700 --> 00:00:54,818 We need to create a network 20 00:00:54,818 --> 00:00:58,400 then we need to start our Mongo Db container 21 00:00:58,400 --> 00:01:00,370 with a quite long command 22 00:01:00,370 --> 00:01:02,360 because we add environmental variables, 23 00:01:02,360 --> 00:01:04,250 we add a volume and so on, 24 00:01:04,250 --> 00:01:06,387 we attach it to the network 25 00:01:06,387 --> 00:01:09,970 then we have to build our Node API image. 26 00:01:09,970 --> 00:01:13,460 Of course not every time but at least once, 27 00:01:13,460 --> 00:01:17,180 and then we can start our node backend container, 28 00:01:17,180 --> 00:01:19,530 and this is also a long command. 29 00:01:19,530 --> 00:01:21,250 Assigning environment variables, 30 00:01:21,250 --> 00:01:24,480 which are getting used in the node express application 31 00:01:24,480 --> 00:01:26,620 adding a couple of volumes 32 00:01:26,620 --> 00:01:29,463 and also attaching this to the network and so on. 33 00:01:30,310 --> 00:01:31,930 And then we need to build 34 00:01:31,930 --> 00:01:34,320 our react single application image, 35 00:01:34,320 --> 00:01:36,820 and then start our react container 36 00:01:36,820 --> 00:01:38,680 also with a bit mount, 37 00:01:38,680 --> 00:01:42,680 publishing the ports and an inter active mode, 38 00:01:42,680 --> 00:01:44,620 and if we wanna tear everything down, 39 00:01:44,620 --> 00:01:46,610 we have to stop all the containers 40 00:01:46,610 --> 00:01:49,610 and potentially, we then even have to remove 41 00:01:49,610 --> 00:01:53,240 networks or named volumes thereafter. 42 00:01:53,240 --> 00:01:54,900 So, long story short, 43 00:01:54,900 --> 00:01:57,250 there is a lot of work to be done here 44 00:01:57,250 --> 00:01:59,870 and this is just a basic application 45 00:01:59,870 --> 00:02:03,840 consisting of three different containers that work together. 46 00:02:03,840 --> 00:02:07,710 It's not unrealistic that you might wanna build applications 47 00:02:07,710 --> 00:02:10,919 that consist of even more containers. 48 00:02:10,919 --> 00:02:14,650 Now we can do something like this with Docker as you saw, 49 00:02:14,650 --> 00:02:18,110 and it's not horrible, but it's also not super convenient, 50 00:02:18,110 --> 00:02:21,080 and that's why the Docker ecosystem, 51 00:02:21,080 --> 00:02:22,700 ships with a naval tool, 52 00:02:22,700 --> 00:02:24,870 which is called, Docker Compose, 53 00:02:24,870 --> 00:02:29,620 which makes managing multi containers setups easier, 54 00:02:29,620 --> 00:02:33,240 it helps you automate the setup process 55 00:02:33,240 --> 00:02:36,330 and it allows you to bring up this entire setup, 56 00:02:36,330 --> 00:02:39,340 with all the different containers and their individual 57 00:02:39,340 --> 00:02:42,550 configurations with just one command. 58 00:02:42,550 --> 00:02:44,560 And you can then also tear everything down 59 00:02:44,560 --> 00:02:45,853 with just one command. 60 00:02:46,810 --> 00:02:48,090 Now, in this module, 61 00:02:48,090 --> 00:02:49,450 we going to have a closer look 62 00:02:49,450 --> 00:02:51,820 at this Docker Composed tool. 63 00:02:51,820 --> 00:02:54,170 We going to learn what exactly it is, 64 00:02:54,170 --> 00:02:57,220 and of course we also going to learn how we can use it 65 00:02:57,220 --> 00:03:00,000 and how we can utilize Docker Compose 66 00:03:00,000 --> 00:03:04,120 to make working with this multi container application 67 00:03:04,120 --> 00:03:06,173 a bit more convenient and easier.