WEBVTT 00:00.660 --> 00:02.178 -: In the last section, 00:02.178 --> 00:03.960 we spoke about how we make our own custom image. 00:03.960 --> 00:05.613 We create a Dockerfile, we feed it into the docker server 00:05.613 --> 00:09.240 and that's going to eventually build a useful image 00:09.240 --> 00:12.210 that we can use to start up our own custom containers. 00:12.210 --> 00:13.560 And inside that Dockerfile 00:13.560 --> 00:16.440 we're gonna specify a base image, run some commands 00:16.440 --> 00:18.450 and then eventually specify command to run 00:18.450 --> 00:21.120 when` a container is created outta the image. 00:21.120 --> 00:21.953 So in this section, 00:21.953 --> 00:25.200 we're gonna start working on our own custom Dockerfile. 00:25.200 --> 00:26.033 Let me first tell 00:26.033 --> 00:28.590 you about what we're going to be trying to build. 00:28.590 --> 00:30.540 So we are going to make a Dockerfile 00:30.540 --> 00:32.970 that is going to create an image that's going to 00:32.970 --> 00:36.330 run Redis server whenever it starts up. 00:36.330 --> 00:37.350 Now, throughout this course, 00:37.350 --> 00:39.600 we've already been making use of that Redis image 00:39.600 --> 00:41.940 to start up Redis on our local computer, 00:41.940 --> 00:44.310 but I wanna show you how to build that thing 00:44.310 --> 00:48.180 from scratch or somewhat from scratch just to be precise. 00:48.180 --> 00:50.250 So this is gonna be going to be the purpose 00:50.250 --> 00:51.870 of our Dockerfile 00:51.870 --> 00:54.330 and the image that we're going to create out of it. 00:54.330 --> 00:56.520 So let's get started right now. 00:56.520 --> 01:00.030 I'm gonna first begin by flipping over to my terminal 01:00.030 --> 01:02.520 and I'm going to create a new working directory 01:02.520 --> 01:04.893 or kind of a project directory of sorts. 01:05.760 --> 01:09.753 And, I'm going to call it Redis image, like so. 01:10.620 --> 01:12.810 Now you can put this folder anywhere you want 01:12.810 --> 01:16.200 on your machine, doesn't matter, anywhere is good. 01:16.200 --> 01:18.750 I'll then change into that directory 01:18.750 --> 01:20.790 and then I'm gonna start up my code editor 01:20.790 --> 01:22.560 inside that folder. 01:22.560 --> 01:25.290 Now quick note, I am making use of Visual Studio Code 01:25.290 --> 01:26.280 and I have configured it 01:26.280 --> 01:28.110 so that I could run it from the command line. 01:28.110 --> 01:31.410 So that is why I am able to run code dot right here. 01:31.410 --> 01:33.660 If you have not gone through those same steps 01:33.660 --> 01:35.310 you will not be able to run that command 01:35.310 --> 01:37.020 and start up your editor. 01:37.020 --> 01:39.060 Essentially, all you need to do right now is start up 01:39.060 --> 01:41.130 whatever code editor you like to use 01:41.130 --> 01:44.703 and open up that Redis image directory that we just created. 01:46.260 --> 01:47.370 Then inside of here, 01:47.370 --> 01:51.030 I'm going to make a new file called Dockerfile 01:51.030 --> 01:55.020 and notice how it has a capital D and it has no extension. 01:55.020 --> 01:57.960 So there's no JS on here, there's no shell 01:57.960 --> 01:58.830 there's nothing like that. 01:58.830 --> 02:01.023 It is simply called Dockerfile. 02:01.950 --> 02:03.690 So then inside of here, we're gonna write 02:03.690 --> 02:05.880 out a couple of comments to guide us through 02:05.880 --> 02:08.850 the process of creating our custom image 02:08.850 --> 02:10.890 and it's gonna essentially follow this template 02:10.890 --> 02:12.570 of steps right here. 02:12.570 --> 02:14.190 So the first comment I'm gonna put down 02:14.190 --> 02:15.420 and notice how we create a comment 02:15.420 --> 02:17.490 by putting down the pound symbol. 02:17.490 --> 02:20.220 I'm gonna say that I'm going to use an existing 02:20.220 --> 02:22.293 Docker image as a base. 02:23.880 --> 02:28.290 I'm then going to download and install a dependency. 02:28.290 --> 02:31.830 And then finally, I'm gonna tell the image what to do 02:31.830 --> 02:34.923 when it starts as a container. 02:37.590 --> 02:38.790 All right. 02:38.790 --> 02:39.750 Now, I'll be honest with you 02:39.750 --> 02:41.700 the way we're going to approach this Dockerfile 02:41.700 --> 02:43.920 we're just gonna write out all the code inside of here, 02:43.920 --> 02:45.180 all the configuration. 02:45.180 --> 02:46.980 We're gonna use it to build our image 02:46.980 --> 02:49.140 and then we're gonna come back and talk about 02:49.140 --> 02:51.720 all the configuration that we've written inside of here. 02:51.720 --> 02:52.553 To be honest, 02:52.553 --> 02:54.289 it's a lot easier to understand the configuration 02:54.289 --> 02:55.470 that we're gonna write 02:55.470 --> 02:59.100 after you've actually seen the process of creating an image. 02:59.100 --> 03:02.310 So a little bit of just blind copy pasting here, okay, 03:02.310 --> 03:04.980 so just follow along and we'll very quickly come back 03:04.980 --> 03:08.430 and talk about the exact lines of code that we're adding in. 03:08.430 --> 03:12.573 So the first thing I'm gonna write down is from Alpine. 03:14.220 --> 03:16.230 Then in the next section I'm gonna add 03:16.230 --> 03:21.230 RUN apk add --update Redis. 03:23.100 --> 03:25.470 And then finally, on the very bottom line here 03:25.470 --> 03:30.470 I'm gonna to add cmd, a set of square brackets 03:30.930 --> 03:32.760 a set of double quotes, 03:32.760 --> 03:36.603 and then inside there I'll put Redis dash server like so. 03:37.890 --> 03:40.200 Now I'm gonna save this file. 03:40.200 --> 03:42.870 I'm gonna flip back over to my terminal. 03:42.870 --> 03:44.160 I'm gonna make sure that I'm inside 03:44.160 --> 03:46.680 of that Redis dash image directory 03:46.680 --> 03:48.390 and I'm going to run the line 03:48.390 --> 03:50.370 run the command, excuse me, 03:50.370 --> 03:53.370 docker build dot. 03:53.370 --> 03:55.020 Don't forget the little dot on there. 03:55.020 --> 03:56.820 Notice how there's a little period. 03:56.820 --> 03:57.870 So I'm gonna run that 03:58.890 --> 04:00.870 and then we're gonna very quickly see a whole bunch 04:00.870 --> 04:02.580 of outputs start to stream along here. 04:02.580 --> 04:04.710 And then eventually I see a message that says 04:04.710 --> 04:07.323 successfully built and then blah, blah, blah. 04:08.280 --> 04:10.260 Now we're gonna copy this idea right here 04:10.260 --> 04:13.260 and then run Docker run 04:13.260 --> 04:17.283 and then I'll paste that idea in and execute this. 04:18.870 --> 04:21.270 And then we're going to very quickly see all the kind 04:21.270 --> 04:23.490 of output here that we saw previously when we ran 04:23.490 --> 04:25.470 that Docker seeing the Redis image. 04:25.470 --> 04:26.820 And the last message I should see 04:26.820 --> 04:29.610 is ready to accept connections. 04:29.610 --> 04:31.110 Okay, so we just went through the process 04:31.110 --> 04:33.720 of creating the Dockerfile, using it to build an image 04:33.720 --> 04:35.280 and we started that image up, 04:35.280 --> 04:37.020 but we haven't really said anything about 04:37.020 --> 04:38.760 what really happened there. 04:38.760 --> 04:41.550 I'm gonna stop the running container by pressing control C. 04:41.550 --> 04:42.830 We're gonna take a quick break, come back 04:42.830 --> 04:45.090 to the next section and talk about exactly 04:45.090 --> 04:48.510 what we just did inside this file and at the terminal. 04:48.510 --> 04:50.960 So quick break and I'll see you in just a minute.