1 00:00:02,310 --> 00:00:04,780 To sum it up, here are a couple of terms 2 00:00:04,780 --> 00:00:06,720 you should keep in mind 3 00:00:06,720 --> 00:00:09,480 because you will see them throughout this course. 4 00:00:09,480 --> 00:00:11,610 And that starts with the Cluster, 5 00:00:11,610 --> 00:00:15,300 which is that set that collection of Node machines, 6 00:00:15,300 --> 00:00:16,920 Master, and Worker Nodes, 7 00:00:16,920 --> 00:00:19,510 which together make up your deployment 8 00:00:19,510 --> 00:00:22,233 or your desired end state. 9 00:00:23,240 --> 00:00:25,610 The Nodes are then the next important thing. 10 00:00:25,610 --> 00:00:28,630 These are the physical or virtual machines 11 00:00:28,630 --> 00:00:31,280 with certain hardware capacities 12 00:00:31,280 --> 00:00:33,410 which host one or multiple Pods 13 00:00:33,410 --> 00:00:36,200 and which communicate with the Cluster 14 00:00:36,200 --> 00:00:38,190 or within the Cluster. 15 00:00:38,190 --> 00:00:41,350 And there you've got this Master Node with the Control Plane 16 00:00:41,350 --> 00:00:44,930 which manages the Pods across all the Worker Nodes. 17 00:00:44,930 --> 00:00:47,370 And therefore, you then also got the Worker Nodes 18 00:00:47,370 --> 00:00:49,313 as the other Node type. 19 00:00:50,230 --> 00:00:53,800 And these are the actual machines hosting your Pods, 20 00:00:53,800 --> 00:00:54,910 and therefore in the end, 21 00:00:54,910 --> 00:00:58,220 running your App Containers plus the resources 22 00:00:58,220 --> 00:00:59,620 these Containers might need. 23 00:01:01,020 --> 00:01:03,590 Pods is another important term 24 00:01:03,590 --> 00:01:05,600 which you'll hear in this course 25 00:01:05,600 --> 00:01:07,430 because that's a Kubernetes term. 26 00:01:07,430 --> 00:01:11,430 And it simply means the Application Containers 27 00:01:11,430 --> 00:01:14,090 as well as their required resources 28 00:01:14,090 --> 00:01:18,060 combined together into this unit which is called a Pod, 29 00:01:18,060 --> 00:01:21,950 which is just this shell around your Container, 30 00:01:21,950 --> 00:01:24,570 which in the end will start the Container 31 00:01:24,570 --> 00:01:27,790 and manage that specific Container. 32 00:01:27,790 --> 00:01:30,410 And Pods themselves as mentioned 33 00:01:30,410 --> 00:01:32,990 are then managed by the Master Node. 34 00:01:32,990 --> 00:01:35,060 And if a Pod is created, 35 00:01:35,060 --> 00:01:38,923 that's equivalent to running the Container in the Pod. 36 00:01:39,960 --> 00:01:42,270 Containers, of course, also still matter. 37 00:01:42,270 --> 00:01:44,300 It is a Docker course after all. 38 00:01:44,300 --> 00:01:47,880 And these are your regular Docker Containers. 39 00:01:47,880 --> 00:01:50,910 So when I say that a Pod runs a Container, 40 00:01:50,910 --> 00:01:52,890 I really just mean that in the end, 41 00:01:52,890 --> 00:01:57,890 this Pod kind of executes the docker run command internally. 42 00:01:57,960 --> 00:01:59,200 Last but not least, 43 00:01:59,200 --> 00:02:01,920 something you haven't heard about in this module, 44 00:02:01,920 --> 00:02:05,040 but something you will hear about in the next modules, 45 00:02:05,040 --> 00:02:07,420 we also got services. 46 00:02:07,420 --> 00:02:11,960 Services, I can already tell you that are logical sets, 47 00:02:11,960 --> 00:02:16,080 so in the end, groups of Pods with a unique Pod 48 00:02:16,080 --> 00:02:18,920 and Container-independent IP address. 49 00:02:18,920 --> 00:02:23,660 And services will be important for reaching our Pods, 50 00:02:23,660 --> 00:02:26,490 and therefore the Containers inside of them. 51 00:02:26,490 --> 00:02:28,090 Services therefore, of course, 52 00:02:28,090 --> 00:02:30,410 are related to this proxy thing 53 00:02:30,410 --> 00:02:32,600 which I did mention in this section section. 54 00:02:32,600 --> 00:02:33,433 And at the end, 55 00:02:33,433 --> 00:02:36,940 service is just a term in the Kubernetes world 56 00:02:36,940 --> 00:02:41,560 for exposing certain Pods to the outside world, 57 00:02:41,560 --> 00:02:45,590 for ensuring that certain Pods are reachable 58 00:02:45,590 --> 00:02:48,783 with a certain IP address or domain. 59 00:02:49,700 --> 00:02:51,840 But that's all just the theory 60 00:02:51,840 --> 00:02:54,920 and these are all important terms to know, 61 00:02:54,920 --> 00:02:58,790 but of course, in order to fully understand Kubernetes, 62 00:02:58,790 --> 00:03:00,660 we need to get our hands dirty 63 00:03:00,660 --> 00:03:02,680 and we need to start working with it. 64 00:03:02,680 --> 00:03:05,230 And that's exactly what we're going to do 65 00:03:05,230 --> 00:03:06,833 in the next course section.