WEBVTT 00:01.133 --> 00:02.130 Instructor: In the last couple of sections, 00:02.130 --> 00:03.810 we've looked at a couple of different ways 00:03.810 --> 00:05.430 of updating a deployment. 00:05.430 --> 00:08.550 So we understand that we can change the number of replicas 00:08.550 --> 00:10.590 and we can change, say the container ports 00:10.590 --> 00:12.510 or even the image that is used 00:12.510 --> 00:15.840 by this deployment whenever it is creating a pod. 00:15.840 --> 00:17.700 But one thing that we haven't quite looked at 00:17.700 --> 00:19.399 is how we can update a deployment 00:19.399 --> 00:22.883 when a new version of an image becomes available. 00:22.883 --> 00:24.691 So I want you to imagine for a second 00:24.691 --> 00:26.130 that maybe you and I 00:26.130 --> 00:28.380 go off to our multi worker project 00:28.380 --> 00:31.170 and maybe we make an update to that image 00:31.170 --> 00:34.170 and then we push the image up to Docker hub. 00:34.170 --> 00:35.007 How would we somehow 00:35.007 --> 00:39.030 get our deployment to pull down that latest version 00:39.030 --> 00:41.010 and recreate all of our pods 00:41.010 --> 00:42.900 using that latest version? 00:42.900 --> 00:46.020 I wanna look into that a little bit inside this section. 00:46.020 --> 00:47.280 Now let's take a look at a diagram 00:47.280 --> 00:48.330 that's going to explain 00:48.330 --> 00:50.880 the series of changes we're going to make to our project 00:50.880 --> 00:53.580 to kind of simulate updating an image 00:53.580 --> 00:55.980 and kind of simulate how we would update a deployment 00:55.980 --> 00:58.203 to accommodate for that updated image. 00:59.460 --> 01:02.610 Okay, so first off, we're going to update our deployment 01:02.610 --> 01:04.020 and we're gonna change it to use the 01:04.020 --> 01:06.030 multi-client image again. 01:06.030 --> 01:07.710 The only reason that we're going to change it to use 01:07.710 --> 01:08.580 multi client 01:08.580 --> 01:11.370 is that it gives us something to look at inside the browser. 01:11.370 --> 01:13.680 And so it makes it really easy to verify that 01:13.680 --> 01:16.890 our pods are running the correct version of an image. 01:16.890 --> 01:18.413 After that, we're then going to go 01:18.413 --> 01:20.400 back over to the source code for our 01:20.400 --> 01:22.050 multi client project. 01:22.050 --> 01:24.000 We're gonna make a change to that project. 01:24.000 --> 01:25.560 We're gonna rebuild the image 01:25.560 --> 01:27.900 and then push the image up to Docker hub. 01:27.900 --> 01:28.920 So that's gonna simulate 01:28.920 --> 01:30.630 a very real deployment 01:30.630 --> 01:33.330 or a very real change to an application. 01:33.330 --> 01:35.130 All the time when you're using Kubernetes 01:35.130 --> 01:36.540 and all this container stuff 01:36.540 --> 01:38.460 you're going to want to change an image 01:38.460 --> 01:40.050 and you're going to want to make sure that the 01:40.050 --> 01:41.550 latest version of that image 01:41.550 --> 01:44.343 eventually gets deployed onto your Kubernetes cluster. 01:45.300 --> 01:48.210 After we push that changed image up to Docker hub 01:48.210 --> 01:50.670 we're then going to somehow get our deployment 01:50.670 --> 01:52.500 to recreate all of its pods 01:52.500 --> 01:54.060 with that latest version of 01:54.060 --> 01:56.520 multi client that you and I create. 01:56.520 --> 01:57.570 So let's get to it. 01:57.570 --> 01:59.520 Step number one is going to be to 01:59.520 --> 02:00.780 change our deployment to use 02:00.780 --> 02:02.970 multi client again. 02:02.970 --> 02:04.470 So inside of my code editor 02:04.470 --> 02:07.173 I'm gonna find the client_deployment.emo file. 02:08.280 --> 02:10.200 We're gonna make a couple changes in here. 02:10.200 --> 02:11.250 The first thing I'm going to do 02:11.250 --> 02:13.320 is reduce the number of replicas 02:13.320 --> 02:14.910 down to one. 02:14.910 --> 02:15.743 So we're just gonna run 02:15.743 --> 02:18.270 one replica all by itself. 02:18.270 --> 02:19.740 That's just gonna make it a little bit easier 02:19.740 --> 02:22.110 for testing purposes, so that we can 02:22.110 --> 02:23.610 get a better idea of when that 02:23.610 --> 02:25.980 single pod is being updated or recreated 02:25.980 --> 02:27.363 or whatever it might be. 02:28.230 --> 02:30.660 Next up, we're going to change our image right here. 02:30.660 --> 02:32.130 So instead of multi worker, 02:32.130 --> 02:34.170 we're going to get multi client. 02:34.170 --> 02:35.700 And then one other thing that I want to do 02:35.700 --> 02:37.320 on the image right here, 02:37.320 --> 02:38.730 besides putting on multi client 02:38.730 --> 02:41.070 is I wanna make sure that we also update the port 02:41.070 --> 02:43.980 that is exposed or forwarded on that image. 02:43.980 --> 02:46.320 So a container port rather than nine nine nine, 02:46.320 --> 02:48.330 we're going to change that back to 02:48.330 --> 02:50.610 3000 like so, because you remember 02:50.610 --> 02:52.161 that is the port, that is exposed or 02:52.161 --> 02:54.600 that engine X inside the multi-client image 02:54.600 --> 02:56.520 is going to listen on. 02:56.520 --> 02:57.840 Okay, so that looks good. 02:57.840 --> 02:58.673 Let's now 02:58.673 --> 02:59.700 take these changes. 02:59.700 --> 03:01.020 I'm gonna save this file 03:01.020 --> 03:02.250 and then I'm going to apply 03:02.250 --> 03:03.480 this new configuration 03:03.480 --> 03:05.490 to our Kubernetes cluster. 03:05.490 --> 03:08.590 So back at my terminal, I'll do a cube CTL apply 03:09.771 --> 03:11.583 client_deployment.emo. 03:13.890 --> 03:15.120 So I'm gonna make that change. 03:15.120 --> 03:15.990 And then we will want to 03:15.990 --> 03:18.120 very quickly test this out inside the browser 03:18.120 --> 03:19.710 and make sure that we can access 03:19.710 --> 03:21.450 that newly created container 03:21.450 --> 03:23.340 that's inside of that new pod. 03:23.340 --> 03:24.630 So remember, anytime they want to 03:24.630 --> 03:26.550 access our app inside the browser, 03:26.550 --> 03:28.650 we need to get our mini cube IP 03:28.650 --> 03:31.050 with the mini cube IP command. 03:31.050 --> 03:32.560 I'll copy the IP address 03:33.420 --> 03:34.980 then we'll go back over to our browser. 03:34.980 --> 03:36.900 I'll paste in that IP and remember 03:36.900 --> 03:38.370 we set up that service, 03:38.370 --> 03:40.440 to listen on port 3 1 5 1 5. 03:40.440 --> 03:41.730 So I'll do colon 03:41.730 --> 03:43.740 3 1 5 1 5 03:43.740 --> 03:45.660 And then I see our application appear. 03:45.660 --> 03:47.310 Okay, so that's easy enough. 03:47.310 --> 03:48.330 Let's take a pause right now. 03:48.330 --> 03:49.530 When we come back to the next section 03:49.530 --> 03:50.640 we're gonna make an update 03:50.640 --> 03:52.050 to the multi client image 03:52.050 --> 03:54.360 and then we're going to push it up to Docker hub. 03:54.360 --> 03:56.810 So quick pause and I'll see you in just a minute.