WEBVTT 00:00.900 --> 00:03.060 -: In the last section, we spoke about the big differences 00:03.060 --> 00:06.180 between a persistent volume claim and a persistent volume. 00:06.180 --> 00:09.090 Remember, a volume claim is an advertisement. 00:09.090 --> 00:12.180 It is saying, hey, all the pods inside this cluster 00:12.180 --> 00:14.730 you can choose from a 500 gigabyte option 00:14.730 --> 00:16.980 or a one terabyte option. 00:16.980 --> 00:19.020 When we write our our pod config, 00:19.020 --> 00:20.730 we are gonna say, hey this pod 00:20.730 --> 00:23.100 needs the 500 gigabyte option. 00:23.100 --> 00:24.270 And so you can kind of imagine 00:24.270 --> 00:26.700 that our pod config is going to be handed off 00:26.700 --> 00:30.330 to Kubernetes with this kind of option tied to it. 00:30.330 --> 00:32.070 Kubernetes is gonna see that option 00:32.070 --> 00:33.960 and it's gonna say, oh, okay, I get it. 00:33.960 --> 00:36.840 I need to find an actual instance of storage 00:36.840 --> 00:39.900 inside of my cluster that meets these requirements. 00:39.900 --> 00:43.410 It has to have 500 gigabytes worth of storage. 00:43.410 --> 00:46.050 If Kubernetes does not have a instance of storage 00:46.050 --> 00:47.250 like that ready to go, 00:47.250 --> 00:49.650 then it's going to try to create one on the fly 00:49.650 --> 00:52.860 and then attach it to the pod that gets created. 00:52.860 --> 00:55.200 Now, I can give you diagrams 00:55.200 --> 00:57.900 about this stuff all day and verbal descriptions all day 00:57.900 --> 00:59.250 but to really understand the stuff 00:59.250 --> 01:02.250 you really have to put together a config file on your own. 01:02.250 --> 01:03.150 So in this section 01:03.150 --> 01:06.210 we're going to write out a persistent volume claim. 01:06.210 --> 01:08.010 And remember, this is going to essentially 01:08.010 --> 01:10.890 advertise a possible storage option 01:10.890 --> 01:13.830 that can be attached to a pod config. 01:13.830 --> 01:15.570 So inside of my code editor, 01:15.570 --> 01:17.643 I'm gonna find my K eights directory. 01:18.600 --> 01:20.910 And inside of here, I'm going to make a new file 01:20.910 --> 01:25.910 called database persistent volume claim.yaml. 01:27.600 --> 01:29.340 Now I type that out rather quickly. 01:29.340 --> 01:31.230 Remember that you can always see my file name 01:31.230 --> 01:32.943 at the top here inside this tab. 01:33.780 --> 01:35.610 All right, so inside of here we're gonna write 01:35.610 --> 01:37.380 out a pretty good amount of config. 01:37.380 --> 01:39.180 Some of it is gonna look very familiar 01:39.180 --> 01:42.150 and some of it is going to be a little bit new. 01:42.150 --> 01:44.310 So we'll do the familiar stuff first. 01:44.310 --> 01:47.103 I'll say API version is v1. 01:47.940 --> 01:51.993 Our kind will be persistent volume claim. 01:54.360 --> 01:58.450 We'll do a metadata that has a name of database 02:00.000 --> 02:05.000 persistent volume claim, and then we'll add a spec. 02:05.340 --> 02:07.170 So the spec is where some interesting things 02:07.170 --> 02:08.130 start to come into play. 02:08.130 --> 02:09.360 I think you'll agree with me 02:09.360 --> 02:12.180 that everything up here looks pretty darn familiar. 02:12.180 --> 02:15.930 So for our spec, we're going to give an access modes. 02:15.930 --> 02:18.060 Notice how there is an S on there. 02:18.060 --> 02:19.470 This is going to be an array, 02:19.470 --> 02:21.870 so I'm gonna put a dash in like so, 02:21.870 --> 02:24.030 and then I'm gonna give this a single value. 02:24.030 --> 02:26.643 I'll say read, write once. 02:29.130 --> 02:31.260 On the next line, I'm going to unindent 02:31.260 --> 02:35.310 so that I'm on the same indentation level as access modes. 02:35.310 --> 02:36.903 I'll do resources. 02:37.740 --> 02:42.153 Requests, storage is to GI like, so. 02:43.200 --> 02:44.100 Okay. So that's it. 02:44.100 --> 02:45.690 That is all the config that we need 02:45.690 --> 02:48.240 for our persistent volume claim. 02:48.240 --> 02:49.530 Let's take a quick pause right here. 02:49.530 --> 02:50.670 When we come back to the next section, 02:50.670 --> 02:51.840 we'll talk about exactly 02:51.840 --> 02:54.270 what is going on inside the spec section. 02:54.270 --> 02:56.720 So quick pause and I'll see you in just a minute.