1 00:00:02,060 --> 00:00:03,100 Now, throughout this course, 2 00:00:03,100 --> 00:00:06,420 we'll see way more commands and way more ways of running 3 00:00:06,420 --> 00:00:09,230 and configuring images and containers. 4 00:00:09,230 --> 00:00:13,150 Now, I wanna focus on a couple of other key functionalities, 5 00:00:13,150 --> 00:00:15,230 which will often be useful. 6 00:00:15,230 --> 00:00:19,480 And that starts with managing our images and containers, 7 00:00:19,480 --> 00:00:23,260 especially the ones which we maybe don't need anymore. 8 00:00:23,260 --> 00:00:25,200 If I print my running containers, 9 00:00:25,200 --> 00:00:28,090 I currently got two containers up and running. 10 00:00:28,090 --> 00:00:30,840 If I print all my containers, 11 00:00:30,840 --> 00:00:33,360 you see i have a decent list here. 12 00:00:33,360 --> 00:00:36,000 You might have less containers than that 13 00:00:36,000 --> 00:00:37,490 because I also started 14 00:00:37,490 --> 00:00:40,500 and stopped some containers off screen, 15 00:00:40,500 --> 00:00:43,230 but still by now, if you followed along, 16 00:00:43,230 --> 00:00:45,330 you also have a couple of stopped 17 00:00:45,330 --> 00:00:48,140 and also a couple of running containers. 18 00:00:48,140 --> 00:00:52,580 And of course, this list gets longer and longer 19 00:00:52,580 --> 00:00:54,950 the more containers you're working with. 20 00:00:54,950 --> 00:00:58,130 And therefore it might make sense to clean this list up 21 00:00:58,130 --> 00:01:00,900 from time to time and to remove containers 22 00:01:00,900 --> 00:01:02,930 you don't need anymore. 23 00:01:02,930 --> 00:01:06,550 And you can do this with the docker rm command, 24 00:01:06,550 --> 00:01:11,053 which stands for remove and the this removes containers. 25 00:01:11,890 --> 00:01:13,620 Now, again, if I print containers, 26 00:01:13,620 --> 00:01:15,700 I got two running containers. 27 00:01:15,700 --> 00:01:19,010 And for example, if you remove a running container 28 00:01:19,010 --> 00:01:22,780 by parsing the container name to rm, you get an error, 29 00:01:22,780 --> 00:01:24,700 you cannot remove a running container, 30 00:01:24,700 --> 00:01:26,610 which I guess makes sense. 31 00:01:26,610 --> 00:01:30,840 So we, first of all need to stop running containers 32 00:01:30,840 --> 00:01:33,550 to be able to then remove them thereafter. 33 00:01:33,550 --> 00:01:35,320 Therefore I will do that here. 34 00:01:35,320 --> 00:01:39,220 I will stop the two containers I still have up and running 35 00:01:39,220 --> 00:01:44,220 at this point here with docker stop and there after, 36 00:01:44,510 --> 00:01:46,860 we can use the rm command 37 00:01:46,860 --> 00:01:49,690 to remove those containers as well. 38 00:01:49,690 --> 00:01:52,200 And I wanna clean up all my containers here 39 00:01:52,200 --> 00:01:56,563 so that I have a cleaner and shorter ps -a list here. 40 00:01:57,750 --> 00:02:01,430 Therefore what we can do is we can run docker rm, 41 00:02:01,430 --> 00:02:05,730 and then actually parse multiple container names at once, 42 00:02:05,730 --> 00:02:08,510 simply separated by white space. 43 00:02:08,510 --> 00:02:09,920 And that's what I'm doing here. 44 00:02:09,920 --> 00:02:12,420 I'm just copying all those container names 45 00:02:12,420 --> 00:02:15,283 and I'm parsing them to docker rm. 46 00:02:16,290 --> 00:02:17,530 This is a bit cumbersome, 47 00:02:17,530 --> 00:02:20,900 but I'll soon show you a way of ensuring that containers 48 00:02:20,900 --> 00:02:24,640 are removed automatically if not needed anymore. 49 00:02:24,640 --> 00:02:27,340 So here I'm doing this manually though, 50 00:02:27,340 --> 00:02:30,150 just copying in all those containers, 51 00:02:30,150 --> 00:02:34,293 which I started in the past, which are now all stopped. 52 00:02:35,610 --> 00:02:39,070 And after running this, if I run docker ps -a again, 53 00:02:39,070 --> 00:02:40,850 I have an empty list 54 00:02:41,760 --> 00:02:45,700 and that's how we can clear and remove containers. 55 00:02:45,700 --> 00:02:49,560 Now, clearly this is a very cumbersome way of doing it. 56 00:02:49,560 --> 00:02:51,520 So I'll soon show you a more elegant 57 00:02:51,520 --> 00:02:54,400 or easier way of removing a container 58 00:02:54,400 --> 00:02:56,290 when it's not needed anymore. 59 00:02:56,290 --> 00:02:57,970 Before we do that, though, 60 00:02:57,970 --> 00:02:59,790 let's dive into images 61 00:02:59,790 --> 00:03:02,220 and see how we can manage those. 62 00:03:02,220 --> 00:03:06,400 For Debian, also got a command ps lists, containers, 63 00:03:06,400 --> 00:03:10,040 images, lists images, and here by default, 64 00:03:10,040 --> 00:03:12,580 we see all the images we have. 65 00:03:12,580 --> 00:03:14,530 Here we see the node image, 66 00:03:14,530 --> 00:03:17,320 which we pulled in earlier, and you'll see, 67 00:03:17,320 --> 00:03:20,340 this was created three days ago, not by us, 68 00:03:20,340 --> 00:03:24,720 but by the node team and we pulled it down and used it. 69 00:03:24,720 --> 00:03:27,630 And you also see the size it's occupying 70 00:03:27,630 --> 00:03:30,870 on your hard drive somewhere. 71 00:03:30,870 --> 00:03:32,930 And then we see our accustom images, 72 00:03:32,930 --> 00:03:36,060 which we built based on our docker file. 73 00:03:36,060 --> 00:03:39,060 And you see the size is basically node 74 00:03:39,060 --> 00:03:41,680 and then a tiny bit of extra size, 75 00:03:41,680 --> 00:03:46,570 which are our node modules dependencies and our source code. 76 00:03:46,570 --> 00:03:49,210 So the majority of the size is made up by node 77 00:03:49,210 --> 00:03:51,840 and they're by the way, in this node image, 78 00:03:51,840 --> 00:03:54,720 which we used they're the node image, 79 00:03:54,720 --> 00:03:57,010 all it built up on another image, 80 00:03:57,010 --> 00:04:00,440 which is basically a Linux operating system layer 81 00:04:00,440 --> 00:04:02,670 on which this node images is placed. 82 00:04:02,670 --> 00:04:06,020 So here again, this size is not just node 83 00:04:06,020 --> 00:04:08,260 and the node executable tools, 84 00:04:08,260 --> 00:04:12,060 but those tools and the operating system image 85 00:04:12,060 --> 00:04:14,010 on which the node image builds up. 86 00:04:14,010 --> 00:04:16,030 But that's just a side node. 87 00:04:16,030 --> 00:04:18,950 Now the main thing here is that we got a bunch of images, 88 00:04:18,950 --> 00:04:21,290 which we might or might not need. 89 00:04:21,290 --> 00:04:26,070 And we can also remove images here with the rmi command. 90 00:04:27,090 --> 00:04:32,090 So rm for removing containers, rmi for removing images, 91 00:04:34,050 --> 00:04:37,150 and you can then simply grab the image ID 92 00:04:38,180 --> 00:04:41,600 and parse that to rmi like this. 93 00:04:41,600 --> 00:04:45,220 And now this deletes this image and basically all the layers 94 00:04:45,220 --> 00:04:48,450 inside of the image, which is what you see here. 95 00:04:48,450 --> 00:04:51,230 So now if I print docker images again, 96 00:04:51,230 --> 00:04:53,700 we see all the images except for the image 97 00:04:53,700 --> 00:04:55,350 which we just removed. 98 00:04:55,350 --> 00:04:58,300 Now, one important note about removing images, 99 00:04:58,300 --> 00:05:01,870 you can only remove images if they're not getting used 100 00:05:01,870 --> 00:05:03,670 by any container anymore 101 00:05:03,670 --> 00:05:06,370 and that includes stopped container. 102 00:05:06,370 --> 00:05:09,170 If you have a container which is stopped, 103 00:05:09,170 --> 00:05:12,630 then you can't remove images being used by that container. 104 00:05:12,630 --> 00:05:14,960 You need to remove that container first. 105 00:05:14,960 --> 00:05:18,130 So no matter if a container is started or stopped 106 00:05:18,130 --> 00:05:21,400 images belonging to that container, can't be removed. 107 00:05:21,400 --> 00:05:24,163 The container needs to be removed first. 108 00:05:25,380 --> 00:05:27,510 Now, if you wanna get rid of all the images, 109 00:05:27,510 --> 00:05:29,870 which are not being used in running containers 110 00:05:29,870 --> 00:05:33,220 at the moment, you also got the docker image. 111 00:05:33,220 --> 00:05:36,690 So not images but image, prune command, 112 00:05:36,690 --> 00:05:39,880 and this will remove all unused images. 113 00:05:39,880 --> 00:05:43,130 In this case, this would actually remove all the images 114 00:05:43,130 --> 00:05:45,810 and I don't wanna remove all images. 115 00:05:45,810 --> 00:05:50,010 So here I'll just manually remove a couple of images. 116 00:05:50,010 --> 00:05:53,660 You can also remove more than one image at the same time, 117 00:05:53,660 --> 00:05:56,500 just by adding the different image IDs 118 00:05:56,500 --> 00:05:59,490 separated by white space after rmi 119 00:06:01,350 --> 00:06:03,130 and once that is done 120 00:06:03,130 --> 00:06:05,340 I'm left with just a node image 121 00:06:05,340 --> 00:06:07,930 on which I'm building up in my own custom images 122 00:06:07,930 --> 00:06:11,330 and my last image which I built 123 00:06:11,330 --> 00:06:14,843 based on that most recent docker file we have here. 124 00:06:16,230 --> 00:06:18,420 And now of course, we could also run 125 00:06:18,420 --> 00:06:21,260 a new container based on that image. 126 00:06:21,260 --> 00:06:24,653 And that's something I wanna do, but not just like this.