1 00:00:02,120 --> 00:00:05,370 So we saw how we can use the declarative approach. 2 00:00:05,370 --> 00:00:10,370 How can we now make changes to our deployments or services? 3 00:00:10,670 --> 00:00:13,060 Well, the cool thing is you can simply change something 4 00:00:13,060 --> 00:00:15,750 in your Yaml files, reapply the files 5 00:00:15,750 --> 00:00:20,070 and the necessary changes will be made in your cluster. 6 00:00:20,070 --> 00:00:23,020 For example, if you wanna change the number of replicas 7 00:00:23,020 --> 00:00:26,530 for the deployment, you can change it in Yaml file, 8 00:00:26,530 --> 00:00:30,373 save the file and then simply apply it again. 9 00:00:31,910 --> 00:00:34,670 So we run the kub control applied dash f 10 00:00:34,670 --> 00:00:36,150 deployment Yaml file. 11 00:00:36,150 --> 00:00:40,260 Again, if we hit enter, these changes will be made 12 00:00:40,260 --> 00:00:42,490 and therefore if you now run get pods, 13 00:00:42,490 --> 00:00:44,320 you'll see that you get free pods 14 00:00:44,320 --> 00:00:47,180 because we specified three replicas here. 15 00:00:47,180 --> 00:00:48,763 And that's how easy it is. 16 00:00:49,690 --> 00:00:51,630 And if you wanna scale down again 17 00:00:51,630 --> 00:00:54,070 you can of course, rechange this, 18 00:00:54,070 --> 00:00:56,030 apply these changes 19 00:00:56,030 --> 00:00:58,480 and then after a while, 20 00:00:58,480 --> 00:01:00,780 you will see that you got only one pod, 21 00:01:00,780 --> 00:01:03,723 you'll see, two pods are already terminating here. 22 00:01:05,099 --> 00:01:08,740 Now, what if we wanted to change the image for example, 23 00:01:08,740 --> 00:01:11,940 if we wanna go back to kub first app here 24 00:01:12,920 --> 00:01:15,500 we can also change the image here 25 00:01:15,500 --> 00:01:19,453 and then apply this and now see whether that has an effect. 26 00:01:20,830 --> 00:01:23,420 And you see if I reload, it does. 27 00:01:23,420 --> 00:01:27,200 So that is how easy it is to make changes 28 00:01:27,200 --> 00:01:28,730 to your deployments 29 00:01:28,730 --> 00:01:31,940 or to your configuration files in general. 30 00:01:31,940 --> 00:01:33,590 And that's of course, another advantage 31 00:01:33,590 --> 00:01:35,640 of this declarative approach. 32 00:01:35,640 --> 00:01:38,180 You can just change these conflict files, 33 00:01:38,180 --> 00:01:41,490 reapply them, and your changes will be applied. 34 00:01:41,490 --> 00:01:44,090 You don't have to type long commands again 35 00:01:44,090 --> 00:01:46,150 and you can only change single things 36 00:01:46,150 --> 00:01:48,770 and only these changes will then be applied. 37 00:01:48,770 --> 00:01:51,290 So you don't have to repeat an entire command 38 00:01:51,290 --> 00:01:54,250 just to change one option in the command. 39 00:01:54,250 --> 00:01:57,410 With the declarative approach, that's not required. 40 00:01:57,410 --> 00:02:01,170 In addition, of course, you can check this Yaml file 41 00:02:01,170 --> 00:02:03,728 into source, control and also use tools like 42 00:02:03,728 --> 00:02:07,028 Git to therefore for keep track of different versions 43 00:02:07,028 --> 00:02:09,210 of this Yaml file. 44 00:02:09,210 --> 00:02:11,610 So that's another advantage you would have here. 45 00:02:13,040 --> 00:02:17,580 With that however, I'll go back to the tac two here 46 00:02:17,580 --> 00:02:19,180 and apply that. 47 00:02:19,180 --> 00:02:22,220 And if I now reload, we get this again. 48 00:02:22,220 --> 00:02:23,100 So that's awesome, 49 00:02:23,100 --> 00:02:25,150 that's how easy we can make changes here. 50 00:02:26,330 --> 00:02:29,190 Now what about deleting resources? 51 00:02:29,190 --> 00:02:30,760 You also got a command for that 52 00:02:30,760 --> 00:02:32,800 and that's the kub control delete command 53 00:02:32,800 --> 00:02:34,790 which we saw before already, 54 00:02:34,790 --> 00:02:36,710 but besides deleting a deployment 55 00:02:36,710 --> 00:02:40,170 by targeting it by its name, which you still could do, 56 00:02:40,170 --> 00:02:43,050 just because you created it declaratively, 57 00:02:43,050 --> 00:02:46,090 doesn't mean that you can't delete it imperatively, 58 00:02:46,090 --> 00:02:49,970 so we could delete our deployment by its name here, 59 00:02:49,970 --> 00:02:52,460 which we chose, so by this name 60 00:02:53,770 --> 00:02:58,100 but you can also simply call kub control delete dash f 61 00:02:58,100 --> 00:03:02,010 and then point at the file name, which you wanna delete. 62 00:03:02,010 --> 00:03:04,400 And it's not the file, which will be deleted 63 00:03:04,400 --> 00:03:08,800 but the resources that were created based on the file. 64 00:03:08,800 --> 00:03:11,030 And if you wanna delete multiple resources 65 00:03:11,030 --> 00:03:13,070 you can separate them with a comma here 66 00:03:14,210 --> 00:03:19,210 or simply add multiple dash f option flax here like this. 67 00:03:20,810 --> 00:03:22,080 I'm not going to do it here 68 00:03:22,080 --> 00:03:23,720 we're going to do it in the next lecture 69 00:03:23,720 --> 00:03:26,160 but this is how you can delete resources 70 00:03:26,160 --> 00:03:28,370 in a declarative approach 71 00:03:28,370 --> 00:03:31,170 or if you want still in an imperative approach. 72 00:03:31,170 --> 00:03:33,550 So you don't have to go with the declarative one, 73 00:03:33,550 --> 00:03:35,966 you can also use the imperative way of deleting, 74 00:03:35,966 --> 00:03:39,113 even though we created it declaratively.