1
00:00:08,680 --> 00:00:13,480
‫Alright, since this is the first lecture in this section, I'm going to cover real quick what this whole

2
00:00:13,480 --> 00:00:16,130
‫section is about and that's containers.

3
00:00:16,240 --> 00:00:21,850
‫Containers are the fundamental building block of the Docker toolkit and that's one of the first things

4
00:00:21,850 --> 00:00:22,780
‫we're going to learn.

5
00:00:22,810 --> 00:00:27,760
‫We're not going to build images or do any advanced stuff until once we've learned what containers are,

6
00:00:28,060 --> 00:00:35,180
‫how to run them, a little bit of how they're different from a VM, and other basic functionality of a container.

7
00:00:35,440 --> 00:00:40,730
‫So the first thing we want to do is make sure that we have the latest version of Docker and it's working.

8
00:00:40,780 --> 00:00:46,450
‫Once we get through that and this lecture, other lectures will talk about how to start containers, how

9
00:00:46,450 --> 00:00:50,230
‫to manage different aspects of a container: start it,

10
00:00:50,230 --> 00:00:51,650
‫stop it,

11
00:00:51,670 --> 00:00:52,420
‫delete it,

12
00:00:52,420 --> 00:00:53,020
‫create it...

13
00:00:53,020 --> 00:00:54,120
‫that sort of stuff.

14
00:00:54,190 --> 00:00:59,740
‫And we're going to use Nginx for all that. Nginx is a really basic web server that is going

15
00:00:59,740 --> 00:01:06,070
‫to be easy for us to use just to learn the Docker commands and how to do Docker container stuff.

16
00:01:06,070 --> 00:01:11,860
‫After that, we're going to jump in some networking basics. You'll learn Docker networking and how the

17
00:01:11,860 --> 00:01:13,330
‫containers talk to each other.

18
00:01:13,840 --> 00:01:18,310
‫And for this whole section, the only real requirement is that you have the latest version of Docker

19
00:01:18,310 --> 00:01:20,740
‫installed and that it's working properly.

20
00:01:20,740 --> 00:01:25,610
‫So in this lecture we're going to make sure real quick that that's set up correctly.

21
00:01:25,700 --> 00:01:31,070
‫In order for the Docker command line to work properly, you need to make sure you're in the proper

22
00:01:31,100 --> 00:01:33,640
‫terminal for your operating system.

23
00:01:33,650 --> 00:01:39,770
‫I'm going to be using Mac, so I can use either Terminal or iTerm2; the two popular choices on the Mac.

24
00:01:39,860 --> 00:01:44,720
‫Then on Windows, if you're on Docker for Windows you'll use PowerShell.

25
00:01:44,720 --> 00:01:50,150
‫If you're on the Docker ToolBox, you'll use the QuickStart Terminal that comes with Docker ToolBox.

26
00:01:50,390 --> 00:01:54,020
‫And if you're on Linux you'll just use a Linux shell of your choosing.

27
00:01:54,020 --> 00:01:58,700
‫These are all things that I talk about in the previous section for your set-up of your own operating

28
00:01:58,700 --> 00:01:59,390
‫system.

29
00:01:59,390 --> 00:02:01,850
‫So if you have more questions just look at those videos.

30
00:02:02,060 --> 00:02:03,220
‫But let's get started.

31
00:02:03,230 --> 00:02:10,180
‫The first command is docker version. This command simply returns the version of your client --

32
00:02:10,190 --> 00:02:17,240
‫that's the CLI that we just used -- and the server, also called the engine; and, the engine is running

33
00:02:17,410 --> 00:02:19,820
‫in the background on your machine.

34
00:02:19,820 --> 00:02:23,530
‫On Windows it's usually called a service on Mac and Linux,

35
00:02:23,600 --> 00:02:24,910
‫ot's usually called a daemon.

36
00:02:25,100 --> 00:02:31,670
‫And what is happening here is our docker command line is actually talking to the server on my machine and

37
00:02:31,670 --> 00:02:35,550
‫then returning its values, as well as the client values themselves.

38
00:02:35,750 --> 00:02:39,390
‫Ideally they should be the same but they don't have to be the same versions.

39
00:02:39,650 --> 00:02:46,920
‫And you want them to be the latest version as possible. If you have an older version like 1.12 or 1.13,

40
00:02:47,000 --> 00:02:51,880
‫you definitely want to make sure that you go to the previous section and get the proper versions installed

41
00:02:51,890 --> 00:02:56,160
‫because we'll be using a lot of new features that are only in the latest versions.

42
00:02:56,390 --> 00:03:02,260
‫The fact that I did get returned information from the server, validates that I can talk to the server

43
00:03:02,330 --> 00:03:03,800
‫and that it's working properly.

44
00:03:03,800 --> 00:03:08,480
‫If you do get an error there, that means maybe you need to do a sudo docker version.

45
00:03:08,480 --> 00:03:14,180
‫If you're maybe on Linux, or possibly your Docker isn't actually running and you maybe need to go to the

46
00:03:14,180 --> 00:03:18,800
‫previous section setup videos to make sure that Docker's running properly.

47
00:03:18,800 --> 00:03:21,890
‫Now let's get a little more information out of our Docker engine.

48
00:03:21,890 --> 00:03:29,930
‫If we do a docker info, it'll return a lot more stuff than just the version. It'll actually give us a

49
00:03:29,930 --> 00:03:34,280
‫lot of details about our configuration and setup for our engine.

50
00:03:34,280 --> 00:03:39,410
‫Some of these are obvious, like the number of containers you have running or possibly the number of images

51
00:03:39,410 --> 00:03:41,330
‫you have stored in Docker.

52
00:03:41,480 --> 00:03:44,920
‫But a lot of this other stuff may not make sense now and that's fine.

53
00:03:44,930 --> 00:03:48,080
‫We're going to go through a lot of it throughout this course.

54
00:03:48,080 --> 00:03:51,660
‫Now you might be wondering what are all the commands you can use in Docker.

55
00:03:51,830 --> 00:03:57,430
‫And you can get a list of those by simply just typing docker and hitting return.

56
00:03:57,490 --> 00:04:00,230
‫You'll see a long list down here at the bottom.

57
00:04:00,490 --> 00:04:05,760
‫This is not actually the full list, because if you notice up here at the top,

58
00:04:05,950 --> 00:04:08,310
‫we now have this management command.

59
00:04:08,380 --> 00:04:16,030
‫So starting in early 2017, Docker realized that we're getting so many commands down here in this list --

60
00:04:16,620 --> 00:04:22,360
‫where I would just type docker space and the command -- that there were so many of them that they needed

61
00:04:22,360 --> 00:04:26,850
‫to create an easier way to organize all these commands.

62
00:04:26,980 --> 00:04:33,510
‫That's when they created the management commands and that creates a format where you have docker

63
00:04:33,540 --> 00:04:41,090
‫space the management command and then the subcommand. So you will see throughout this course that we're

64
00:04:41,090 --> 00:04:43,460
‫trying to use a little bit of both.

65
00:04:43,520 --> 00:04:46,900
‫We mostly will use the new model of Docker.

66
00:04:47,300 --> 00:04:53,730
‫Let's use an example here of container run -- and that's the new format of that command.

67
00:04:53,840 --> 00:04:58,910
‫But since the beginning of the Docker project, docker run has usually been the way that we type that

68
00:04:58,910 --> 00:04:59,650
‫command.

69
00:04:59,660 --> 00:05:04,820
‫It's just recently that the docker container run has become the new way to run that command.

70
00:05:04,820 --> 00:05:08,960
‫Now the cool thing about Docker, is that it's really focused on backwards compatibility.

71
00:05:08,960 --> 00:05:15,410
‫So the docker run will probably work forever; but, new commands that we get are not going to be using

72
00:05:15,440 --> 00:05:17,960
‫this docker command value.

73
00:05:17,960 --> 00:05:25,460
‫It will be using docker space command space subcommand value. So, each time I use these commands,

74
00:05:25,460 --> 00:05:29,810
‫we will explain what they are and I will show you possibly the old way of doing it and the new way of

75
00:05:29,810 --> 00:05:32,690
‫doing it depending on whether the command has that option.

76
00:05:32,750 --> 00:05:35,190
‫So it'll start to make sense as we go through this course.

77
00:05:37,280 --> 00:05:42,140
‫OK even though we had a very short lecture, and it was pretty simple, let's just review real quick those

78
00:05:42,140 --> 00:05:42,980
‫commands.

79
00:05:42,980 --> 00:05:48,380
‫The docker version command is the one I always use first on a new Docker system; just to make sure that

80
00:05:48,380 --> 00:05:52,780
‫my client can talk to the engine and that I'm running the version that I would expect.

81
00:05:52,820 --> 00:05:59,360
‫Secondly docker info gives me a lot of the configuration values out of the engine just to make sure that

82
00:05:59,360 --> 00:06:01,840
‫it's set up that way that I expect.

83
00:06:01,890 --> 00:06:06,840
‫And lastly, we talked about the command line structure. The old way still works.

84
00:06:06,870 --> 00:06:12,540
‫So for older commands that have been around for the last 4+ years, they still work with docker

85
00:06:12,570 --> 00:06:14,400
‫command and then the options.

86
00:06:14,400 --> 00:06:21,030
‫But for new commands going forward, Docker is creating a new model of the management commands with docker

87
00:06:21,240 --> 00:06:25,550
‫space command space subcommand. The example we use was docker run,

88
00:06:25,560 --> 00:06:31,350
‫one of the most common commands you use in Docker where the old way was docker run but the new way of

89
00:06:31,350 --> 00:06:33,370
‫docker container run also works.

90
00:06:33,540 --> 00:06:37,860
‫And you can decide how you want to use those commands whether you want to use the old way or the new

91
00:06:37,860 --> 00:06:39,580
‫way because they both will still work.