1 00:00:02,250 --> 00:00:04,660 Now this can of course also be used 2 00:00:04,660 --> 00:00:07,300 to download and run it. 3 00:00:07,300 --> 00:00:09,010 And to see this in action, 4 00:00:09,010 --> 00:00:13,290 I'll first of all run Docker image prune-a 5 00:00:13,290 --> 00:00:15,783 to delete all local images. 6 00:00:16,630 --> 00:00:20,720 And once that is done and we've got no images left, 7 00:00:20,720 --> 00:00:23,170 except for this node image, 8 00:00:23,170 --> 00:00:27,280 which is still around because I started this container 9 00:00:27,280 --> 00:00:29,830 based on this node image a couple of minutes ago, 10 00:00:29,830 --> 00:00:32,040 I would have to delete this container first 11 00:00:32,040 --> 00:00:35,100 in order to be able to delete this image 12 00:00:35,100 --> 00:00:37,210 but let's not worry about this now. 13 00:00:37,210 --> 00:00:40,270 The main thing is that all the other images are missing 14 00:00:40,270 --> 00:00:43,040 and with that, we can now use Docker Pull 15 00:00:43,040 --> 00:00:45,770 to download this image. 16 00:00:45,770 --> 00:00:48,210 Now for that first of all I'll log out 17 00:00:48,210 --> 00:00:52,590 to see whether it also works if I'm not logged in anymore, 18 00:00:52,590 --> 00:00:56,060 and then I'll Docker pull academind node-hello-world 19 00:00:57,166 --> 00:01:00,486 which is that image we just pushed. 20 00:01:00,486 --> 00:01:05,236 It then uses that default tag latest and it downloads it. 21 00:01:06,275 --> 00:01:09,707 And then under Docker images, we can see this. 22 00:01:09,707 --> 00:01:12,955 And since this is public, everyone can pull it. 23 00:01:12,955 --> 00:01:15,746 You don't have to be logged in to do that. 24 00:01:15,746 --> 00:01:17,955 That's why I wanted to show this as well. 25 00:01:17,955 --> 00:01:21,387 You need to be logged into Push to this repository, 26 00:01:21,387 --> 00:01:24,115 but everyone is able to pull. 27 00:01:24,115 --> 00:01:27,257 But this now also means that everyone including you 28 00:01:27,257 --> 00:01:28,855 if you're watching this video right now 29 00:01:28,855 --> 00:01:33,855 is able to Docker pull academind/node-hello-world 30 00:01:34,838 --> 00:01:38,507 and you will then have that image on your system. 31 00:01:38,507 --> 00:01:40,546 And of course you can then use that image 32 00:01:40,546 --> 00:01:44,879 to Docker run academind/node-hello-world. 33 00:01:46,395 --> 00:01:47,300 And that's important. 34 00:01:47,300 --> 00:01:49,350 You need to use the full image name 35 00:01:49,350 --> 00:01:51,650 including academind/. 36 00:01:51,650 --> 00:01:54,390 You can now run this and you can now run this 37 00:01:54,390 --> 00:01:57,140 by exposing the right port for example, 38 00:01:57,140 --> 00:02:00,230 and adding that other removal option. 39 00:02:00,230 --> 00:02:02,520 And of course we could also run this in detached mode 40 00:02:02,520 --> 00:02:03,890 if you want it to. 41 00:02:03,890 --> 00:02:06,920 And with that if I reload local hosts 8,000, 42 00:02:06,920 --> 00:02:08,583 I still see this node app. 43 00:02:10,229 --> 00:02:15,230 So with that, I can Docker stop this container 44 00:02:17,540 --> 00:02:20,690 which I started here like this, 45 00:02:20,690 --> 00:02:22,290 and we're done with that. 46 00:02:22,290 --> 00:02:25,310 But that's how you can share your built images 47 00:02:25,310 --> 00:02:30,230 and not just a Docker File with anyone through Docker Hub 48 00:02:30,230 --> 00:02:32,877 and the repositories you manage there. 49 00:02:32,877 --> 00:02:35,210 But Docker Hub has more features, 50 00:02:35,210 --> 00:02:37,310 it can also help us with deployment, 51 00:02:37,310 --> 00:02:38,380 but for the moment, 52 00:02:38,380 --> 00:02:42,040 this is the key feature you have to know 53 00:02:42,040 --> 00:02:46,023 if you plan on sharing your Docker images with anyone else. 54 00:02:46,910 --> 00:02:50,640 Now, a couple of important notes about pulling and running 55 00:02:50,640 --> 00:02:52,890 your remote images. 56 00:02:52,890 --> 00:02:56,220 Docker Pull, when you execute this command 57 00:02:56,220 --> 00:03:01,220 will always pull the latest image of that name 58 00:03:01,270 --> 00:03:04,280 from your container registry. 59 00:03:04,280 --> 00:03:07,580 So if in the meantime, you will rebuild the image 60 00:03:07,580 --> 00:03:10,900 and push an updated image to the registry 61 00:03:10,900 --> 00:03:13,960 the next time you will execute Docker Pull 62 00:03:13,960 --> 00:03:16,103 will fetch that latest image. 63 00:03:17,000 --> 00:03:20,300 Now you could also run Docker Run 64 00:03:20,300 --> 00:03:23,160 without running Docker Pull first. 65 00:03:23,160 --> 00:03:28,160 If Docker Run doesn't find an image locally on your machine, 66 00:03:28,230 --> 00:03:32,060 it will automatically reach out to the container history, 67 00:03:32,060 --> 00:03:33,680 your image name uses 68 00:03:33,680 --> 00:03:36,320 so here in this case, Docker Hub, 69 00:03:36,320 --> 00:03:39,200 and it will check for the image there. 70 00:03:39,200 --> 00:03:41,470 And if it finds an image of that name there 71 00:03:41,470 --> 00:03:44,990 it will use that and pull that automatically. 72 00:03:44,990 --> 00:03:49,510 What Docker Run will not do though, and that's important 73 00:03:49,510 --> 00:03:53,370 is automatically check for updates. 74 00:03:53,370 --> 00:03:55,370 If you have an image locally 75 00:03:55,370 --> 00:03:58,510 because you pulled or ran it before, 76 00:03:58,510 --> 00:04:02,290 then if you run a container again based on an image, 77 00:04:02,290 --> 00:04:05,340 Docker Run will not check if the image 78 00:04:05,340 --> 00:04:07,330 you have locally on your system 79 00:04:07,330 --> 00:04:10,420 is the latest version of that image. 80 00:04:10,420 --> 00:04:12,260 So if in the meantime, 81 00:04:12,260 --> 00:04:17,010 you updated the image and pushed it again to Docker Hub, 82 00:04:17,010 --> 00:04:19,370 just using Docker Run there after 83 00:04:19,370 --> 00:04:23,440 will not give you that latest updated image. 84 00:04:23,440 --> 00:04:27,630 You instead manually need to run Docker Pull 85 00:04:27,630 --> 00:04:29,710 and then the image name first 86 00:04:29,710 --> 00:04:33,070 to ensure that you have that latest image version 87 00:04:33,070 --> 00:04:35,670 and you then execute Docker Run again. 88 00:04:35,670 --> 00:04:38,000 So it automatically pulls images 89 00:04:38,000 --> 00:04:40,730 but not necessarily the latest version 90 00:04:40,730 --> 00:04:44,700 if you already have that image locally on your system, 91 00:04:44,700 --> 00:04:47,303 because you pulled it before already.