WEBVTT 00:00.870 --> 00:02.685 -: In the last section, we put together Docker files 00:02.685 --> 00:06.180 for the client, the server, and the worker projects. 00:06.180 --> 00:07.770 Now that we've got Docker files for each 00:07.770 --> 00:10.050 of those put together that are specifically made 00:10.050 --> 00:12.030 for the development environment, we're gonna 00:12.030 --> 00:14.865 start putting together a Docker Compose file as well, 00:14.865 --> 00:17.820 just as we did on the previous application. 00:17.820 --> 00:19.140 Remember, the entire point 00:19.140 --> 00:21.180 of this Docker Compose file, is to make sure 00:21.180 --> 00:23.310 that it's a lot easier to start up 00:23.310 --> 00:25.830 each of these different images as containers 00:25.830 --> 00:27.450 with the appropriate arguments. 00:27.450 --> 00:30.091 For example, we need to make sure that the Express server 00:30.091 --> 00:32.580 is available on some given port. 00:32.580 --> 00:34.350 Same thing with React Server. 00:34.350 --> 00:36.540 We need to make sure that the worker has the ability 00:36.540 --> 00:37.747 to connect over to Redis. 00:37.747 --> 00:41.610 We need to make sure that the correct environment variables 00:41.610 --> 00:44.160 for connecting to Redis and Postgres are provided 00:44.160 --> 00:46.706 to the Express server and the worker as well. 00:46.706 --> 00:49.590 And so this is all configuration that is going to be done 00:49.590 --> 00:52.593 inside of our Docker Compose file. 00:53.490 --> 00:58.131 All right, now the first container that we're going to add 00:58.131 --> 01:01.410 of our own custom project to our Docker Compose file 01:01.410 --> 01:03.900 is going to be the server process. 01:03.900 --> 01:06.900 So just that Express server by itself. 01:06.900 --> 01:09.060 At the same time, we're also going to start adding 01:09.060 --> 01:12.150 the Postgres server, or the Postgres database 01:12.150 --> 01:15.690 and the Redis database to the Compose file as well. 01:15.690 --> 01:17.213 So in our development environment, 01:17.213 --> 01:19.982 we will have a complete copy of the Express server, 01:19.982 --> 01:23.970 a complete copy of Redis, and a complete copy of Postgres 01:23.970 --> 01:26.940 and they're all gonna work together very nicely. 01:26.940 --> 01:28.767 Once we get these three pieces put together 01:28.767 --> 01:30.900 we'll then come back and start to add in 01:30.900 --> 01:32.970 the React application, the worker, 01:32.970 --> 01:35.043 and the Nginx server as well. 01:37.260 --> 01:39.060 All right, now I've got a couple notes on this diagram 01:39.060 --> 01:41.100 right here, of some of the things that we need to think 01:41.100 --> 01:43.320 about inside of the Compose file. 01:43.320 --> 01:45.420 So we know that we need to add in Postgres. 01:45.420 --> 01:48.660 We know that we need Redis in there as well. 01:48.660 --> 01:51.180 And in both those cases, we need to figure out what image 01:51.180 --> 01:52.730 we should use for both of them. 01:53.820 --> 01:56.250 For the server, we probably need to specify some 01:56.250 --> 01:58.200 of the options that we had seen on the last Docker 01:58.200 --> 01:59.850 Compose file we put together. 01:59.850 --> 02:02.490 So we probably need to specify some build options. 02:02.490 --> 02:04.264 For example, what Docker file to use. 02:04.264 --> 02:06.660 We probably need to set up some volumes 02:06.660 --> 02:09.696 to make sure that anytime we change some of our source code, 02:09.696 --> 02:12.840 the container source code updates as well. 02:12.840 --> 02:13.860 And then this is gonna be something 02:13.860 --> 02:16.140 that we have not done before, but this is gonna be something 02:16.140 --> 02:18.810 that becomes very important in this application. 02:18.810 --> 02:21.030 We're gonna have to start thinking about specifying 02:21.030 --> 02:24.827 some environment variables for the server as well. 02:24.827 --> 02:27.392 Just in case you downloaded the checkpoint zip file 02:27.392 --> 02:30.090 and you didn't go through the assembly of the server 02:30.090 --> 02:33.090 with me, I encourage you to open up 02:33.090 --> 02:34.830 the server directory right now. 02:34.830 --> 02:37.960 And inside of here, you'll see a keys.js file. 02:37.960 --> 02:40.854 This right here is a listing of environment variables 02:40.854 --> 02:44.820 that we need to make sure are setup for this container. 02:44.820 --> 02:48.793 So the server application needs to be given a Redis host, 02:48.793 --> 02:52.410 a Redis port, a Postgres user, Postgres password 02:52.410 --> 02:55.181 Postgres port, all these different environment variables. 02:55.181 --> 02:58.080 They all need to be passed into this container 02:58.080 --> 02:59.880 when it is executed. 02:59.880 --> 03:01.560 And so that's something that we're going to be doing 03:01.560 --> 03:03.690 via our Docker Compose file. 03:03.690 --> 03:05.610 But again, we'll get to that a little bit later on 03:05.610 --> 03:07.170 in the process. 03:07.170 --> 03:08.550 Right now, let's get started 03:08.550 --> 03:10.320 by creating the Docker Compose file 03:10.320 --> 03:12.870 and we'll add a little bit of basic configuration in there 03:12.870 --> 03:15.543 for the Postgres and the Redis applications. 03:17.250 --> 03:20.340 All right, so inside of my root project directory 03:20.340 --> 03:22.221 I'm not inside of any folder right now. 03:22.221 --> 03:24.090 My root project directory 03:24.090 --> 03:28.653 I'll make a Docker dash Compose dot yml file. 03:29.910 --> 03:32.550 Inside of here we'll put down some of the immediate 03:32.550 --> 03:34.410 configuration that we know that we always add 03:34.410 --> 03:36.270 to every Docker Compose file. 03:36.270 --> 03:39.243 I'll say version is three, like so. 03:40.410 --> 03:42.660 After that, we'll then start to specify the list 03:42.660 --> 03:45.420 of different services that should be made available 03:45.420 --> 03:47.520 when we use this Docker Compose file 03:47.520 --> 03:50.040 as a starting point for our application. 03:50.040 --> 03:51.990 So the first service that we're going to define 03:51.990 --> 03:54.690 will be a Postgres instance. 03:54.690 --> 03:56.728 So I'm gonna give this a name of Postgres. 03:56.728 --> 03:59.220 Remember that's the name of the service 03:59.220 --> 04:01.893 as it's been added to our Docker Compose file now. 04:03.900 --> 04:05.203 So for the Postgres project 04:05.203 --> 04:08.370 we don't have to specify the build options 04:08.370 --> 04:11.790 or volumes or anything like that that we did previously. 04:11.790 --> 04:13.800 Instead, the only thing we need to specify here 04:13.800 --> 04:15.900 is the image that we want to use 04:15.900 --> 04:17.359 for this particular service. 04:17.359 --> 04:20.539 And so in this case, we're gonna go up to Docker hub. 04:20.539 --> 04:22.980 We're gonna take a look at the different versions 04:22.980 --> 04:24.630 of Postgres that are available 04:24.630 --> 04:26.310 and we'll specify one to be used 04:26.310 --> 04:29.340 as the base image for our project. 04:29.340 --> 04:34.053 So inside my browser, I'm gonna navigate to hub.docker.com. 04:35.700 --> 04:39.240 I'll find explore on the top right hand side. 04:39.240 --> 04:40.247 And then if we scroll down a little bit 04:40.247 --> 04:45.247 we'll very quickly see what is the first one Postgres. 04:45.750 --> 04:47.439 Wanna make sure I wasn't looking at Redis. 04:47.439 --> 04:50.640 So right here on this list you should see Postgres official 04:50.640 --> 04:51.903 very quickly pop up. 04:54.240 --> 04:56.880 And then under the full description for Postgres 04:56.880 --> 05:00.000 we'll see a couple of different versions that are available. 05:00.000 --> 05:04.590 At this point in time the latest tag is associated in here- 05:04.590 --> 05:05.423 Where is it? 05:05.423 --> 05:06.256 Ah, here we go. 05:06.256 --> 05:07.467 Version 10 of Postgres. 05:07.467 --> 05:10.767 Now if you see a latest tag being applied to version 11 05:10.767 --> 05:13.192 or even version 12 at some point in the future, 05:13.192 --> 05:14.580 that's totally fine. 05:14.580 --> 05:17.100 We are not using any advanced features of Postgres 05:17.100 --> 05:20.160 right now, and so you can safely use the latest tag 05:20.160 --> 05:23.010 probably without any issue whatsoever. 05:23.010 --> 05:25.710 So back inside of my Docker Compose file, I'm gonna say 05:25.710 --> 05:28.239 that the image to use for the Postgres service 05:28.239 --> 05:30.540 will be Redis, or excuse me, not Redis. 05:30.540 --> 05:34.709 I keep mixing the two up, Postgres colon latest. 05:34.709 --> 05:37.830 Oh, latest, like so. 05:37.830 --> 05:39.990 So now anytime that Docker Compose starts up, 05:39.990 --> 05:42.720 it's gonna try to create a Postgres service using 05:42.720 --> 05:45.774 the image Postgres, and they'll use the version of it 05:45.774 --> 05:48.660 tagged as latest. 05:48.660 --> 05:50.062 Let's very quickly test this out. 05:50.062 --> 05:51.663 So I'll save this file. 05:52.740 --> 05:54.338 I'll go back over to my command line. 05:54.338 --> 05:56.075 I'm inside of the complex directory, 05:56.075 --> 05:59.001 and I see the Docker Compose file inside of here. 05:59.001 --> 06:01.833 So I will run Docker Compose up, 06:02.760 --> 06:05.160 that will automatically pull down the Postgres image 06:05.160 --> 06:08.490 and start up a Postgres database on my machine. 06:08.490 --> 06:10.950 And so after a little bit of download and setup, 06:10.950 --> 06:12.720 you should eventually see a line that says 06:12.720 --> 06:14.970 something like, Database system is ready 06:14.970 --> 06:16.743 to accept connections down here. 06:17.640 --> 06:18.670 All right, so that's it for Postgres. 06:18.670 --> 06:21.090 Now, one thing I want you to be aware of, 06:21.090 --> 06:24.633 is that on the Postgres document or the repository, 06:25.620 --> 06:27.891 you can scroll down quite a bit and down here 06:27.891 --> 06:29.550 you'll eventually see something that says 06:29.550 --> 06:31.500 start a Postgres instance. 06:31.500 --> 06:34.470 And it shows you how to execute the Docker run command, 06:34.470 --> 06:37.865 while specifying the Postgres password to use right here. 06:37.865 --> 06:39.300 And if you scroll down even more, 06:39.300 --> 06:41.460 you'll see that they are showing a lot of different 06:41.460 --> 06:45.540 optional values you can pass in as environment variables, 06:45.540 --> 06:47.640 so that you can customize the way in which 06:47.640 --> 06:49.710 this Postgres image behaves. 06:49.710 --> 06:52.110 So we are gonna make use of these in just a little bit. 06:52.110 --> 06:53.100 So I just want you to be aware 06:53.100 --> 06:55.110 that we're gonna come back to this page pretty quickly 06:55.110 --> 06:57.780 and reference them this further documentation. 06:57.780 --> 06:59.730 But right now, let's take a quick pause. 06:59.730 --> 07:00.930 When we come back to the next section 07:00.930 --> 07:03.600 we'll start setting up our Redis service as well. 07:03.600 --> 07:05.250 So I'll see you in just a minute.