WEBVTT 00:00.630 --> 00:01.890 -: Hello and welcome. 00:01.890 --> 00:04.200 In this section, I wanna start to tackle two 00:04.200 --> 00:06.390 very important questions that we're going to be answering 00:06.390 --> 00:08.010 throughout this entire course. 00:08.010 --> 00:10.380 The two important questions are, what is Docker? 00:10.380 --> 00:12.960 And secondly, why do we use Docker? 00:12.960 --> 00:15.030 We're gonna first tackle why we use Docker 00:15.030 --> 00:18.090 by going through a quick little demo right now. 00:18.090 --> 00:20.370 Now I'm gonna show you a little flow diagram 00:20.370 --> 00:22.380 and this is a flow of probably a process 00:22.380 --> 00:24.930 you've gone through at least once in your life before. 00:24.930 --> 00:25.763 It's a flow 00:25.763 --> 00:28.170 of installing software on your personal computer 00:28.170 --> 00:31.320 and I bet at least once for you, this is what has happened. 00:31.320 --> 00:33.450 Maybe you have downloaded some installer, 00:33.450 --> 00:35.910 you run that installer, and then inevitably 00:35.910 --> 00:36.930 at some point in time 00:36.930 --> 00:40.140 you end up getting an error message during installation. 00:40.140 --> 00:41.070 So what do you do? 00:41.070 --> 00:42.930 Well, you probably troubleshoot the issue 00:42.930 --> 00:44.280 by looking on Google. 00:44.280 --> 00:48.090 You try to find a solution, you eventually solve that issue. 00:48.090 --> 00:50.430 You then rerun the installer only to find, 00:50.430 --> 00:51.660 hey, ta-da, 00:51.660 --> 00:54.300 you have some other error appearing, and then you have to go 00:54.300 --> 00:57.120 through this entire troubleshooting process again. 00:57.120 --> 01:00.330 So this is at its core what Docker is trying to fix. 01:00.330 --> 01:02.190 Docker wants to make it really easy 01:02.190 --> 01:04.800 and really straightforward for you to install 01:04.800 --> 01:07.620 and run software on any given computer. 01:07.620 --> 01:10.110 Not just your computer, not just your personal laptop, 01:10.110 --> 01:13.170 your personal desktop, but on web servers as well 01:13.170 --> 01:16.320 or any cloud based computing platform. 01:16.320 --> 01:18.360 I wanna give you a very quick demonstration 01:18.360 --> 01:20.070 of this flow right here in action, 01:20.070 --> 01:22.380 and then show you how quickly I can solve 01:22.380 --> 01:24.600 installing a problem whereas me installing 01:24.600 --> 01:26.970 a piece of software by making use of Docker. 01:26.970 --> 01:28.890 So I'm gonna very quickly go through the flow 01:28.890 --> 01:31.830 of installing a piece of software called Reddis. 01:31.830 --> 01:33.930 Reddis is an in-memory data store. 01:33.930 --> 01:35.280 We're going to be using it quite a bit 01:35.280 --> 01:36.960 throughout this course, but for right now 01:36.960 --> 01:38.490 I just wanna give you a quick demo 01:38.490 --> 01:41.160 of how it can be a little bit challenging to get installed 01:41.160 --> 01:42.480 on your own computer. 01:42.480 --> 01:43.313 So I'm just gonna go 01:43.313 --> 01:45.960 through the installation steps here very quickly. 01:45.960 --> 01:47.730 So this is the Reddis homepage. 01:47.730 --> 01:49.650 This is the official download page. 01:49.650 --> 01:51.900 In theory, I could use the documentation here 01:51.900 --> 01:54.780 to install Reddis on my local machine. 01:54.780 --> 01:57.030 I'm gonna go down to the installation section 01:57.030 --> 01:58.657 and it very proudly says, 01:58.657 --> 02:00.960 "Oh yeah just run these four commands right here, 02:00.960 --> 02:02.700 and boom that's pretty much it. 02:02.700 --> 02:05.070 You can then run Reddis." 02:05.070 --> 02:07.320 So I'm gonna grab the first command right here. 02:07.320 --> 02:08.820 I'm gonna copy it 02:08.820 --> 02:11.220 and then I'm going to run it inside my terminal. 02:13.170 --> 02:15.360 So I'll paste, there's the same exact command. 02:15.360 --> 02:17.460 I'm gonna run it, and sure enough, yep 02:17.460 --> 02:18.930 I get an error message. 02:18.930 --> 02:20.040 Now in this case, the error message 02:20.040 --> 02:21.330 is a little bit predictable. 02:21.330 --> 02:23.070 It's complaining about a program that is just 02:23.070 --> 02:25.200 not installed on my local machine. 02:25.200 --> 02:27.090 Now, I could definitely go and troubleshoot this 02:27.090 --> 02:30.060 install that program, and then try installing Reddis again, 02:30.060 --> 02:31.350 but that's the whole point. 02:31.350 --> 02:33.060 You kinda get into this endless cycle 02:33.060 --> 02:34.650 of trying to do all this troubleshooting 02:34.650 --> 02:37.560 as you are installing and running software. 02:37.560 --> 02:40.230 So let me now show you how easy it is to run Reddis, 02:40.230 --> 02:42.960 if you are making use of Docker instead. 02:42.960 --> 02:45.060 I'm gonna go back over to my command line 02:45.060 --> 02:47.910 and I'm gonna run one single command. 02:47.910 --> 02:52.620 I'll say Docker run, dash it, Reddis, like so. 02:52.620 --> 02:54.180 I'll hit enter, and then 02:54.180 --> 02:57.990 after a very brief pause, almost instantaneously 02:57.990 --> 03:01.470 I have an instance of Reddis up and running on my computer. 03:01.470 --> 03:02.430 And that's pretty much it. 03:02.430 --> 03:04.200 That is Docker in a nutshell, 03:04.200 --> 03:06.570 that is how easy it is to run software 03:06.570 --> 03:08.610 when you're making use of Docker. 03:08.610 --> 03:11.250 So to answer the question very directly 03:11.250 --> 03:13.020 of why we use Docker, well, 03:13.020 --> 03:16.320 we make use of it because it makes life really easy 03:16.320 --> 03:18.870 for installing and running software without having to go 03:18.870 --> 03:20.460 through a whole bunch of setup 03:20.460 --> 03:22.801 or installation of dependencies. 03:22.801 --> 03:25.050 Now, we're gonna learn many more reasons 03:25.050 --> 03:27.000 throughout this course of why we use Docker 03:27.000 --> 03:28.530 but I wanted to give you a very quick demo 03:28.530 --> 03:31.050 and show you how easy it can be to get up and running 03:31.050 --> 03:34.470 with some new piece of software when you are using Docker. 03:34.470 --> 03:35.790 Let's take a quick pause right here. 03:35.790 --> 03:37.080 We're gonna come back to the next section 03:37.080 --> 03:41.220 and start trying to answer the question of what Docker is. 03:41.220 --> 03:42.870 So I'll see you in just a minute.