1 00:00:00,000 --> 00:00:05,966 Hi 2 00:00:05,966 --> 00:00:11,099 In the earlier lecture, we discussed about various components involved as a part of helm. 3 00:00:11,100 --> 00:00:17,566 Now it's time to get more in detail about the charts, how to create a custom chart and the syntax and 4 00:00:17,566 --> 00:00:20,299 the various components within the charts. 5 00:00:20,300 --> 00:00:23,633 This is going to be the main section within this particular course where 6 00:00:23,633 --> 00:00:28,933 We are going to have detailed discussion about each and every component within chart. 7 00:00:28,933 --> 00:00:33,433 For that, I'm going to create a custom project and get more in 8 00:00:33,433 --> 00:00:38,899 details about various files available as a part of the charts and how to make use of them. 9 00:00:38,900 --> 00:00:43,233 Then we will start creating a chart from the scratch. 10 00:00:43,233 --> 00:00:48,133 Let me get into the machine where I do have the helm installed. Here 11 00:00:48,133 --> 00:00:54,799 I will be issuing the command helm create mychart 12 00:00:54,800 --> 00:00:58,366 So it's going to create a chart with the name mychart 13 00:00:58,366 --> 00:01:02,332 And that will be put within a folder called mychart 14 00:01:02,333 --> 00:01:04,899 So here mychart folder got created. 15 00:01:04,900 --> 00:01:09,966 If I get into this specific folder, I will be having all the basic required files. 16 00:01:09,966 --> 00:01:16,466 And this by default, create a small chart with sample deployment, services everything. 17 00:01:16,466 --> 00:01:19,299 What I will be doing, I will use this specific structure 18 00:01:19,300 --> 00:01:22,666 Then we will create a chart from the scratch. 19 00:01:22,666 --> 00:01:29,466 Before that, let me get into the different folders and see what are all information will be available within it. 20 00:01:29,466 --> 00:01:35,832 The very basic thing of charts is the templates that will be put within the templates folder if I get 21 00:01:35,833 --> 00:01:41,166 into the templates folder I will be having some sample templates, for time being 22 00:01:41,166 --> 00:01:45,966 Let's not worry about these templates which got created by default for understanding purposes 23 00:01:45,966 --> 00:01:53,966 Let me cat a sample deployment.yaml file 24 00:01:53,966 --> 00:02:00,099 It's going to have the deployment.yaml file, which is templatised, for example within name 25 00:02:00,100 --> 00:02:07,000 I do have a variable which will be read from some value files or from some other chart template. 26 00:02:07,000 --> 00:02:09,333 Don't worry about this particular syntax, what it is 27 00:02:09,333 --> 00:02:13,666 We will be having detailed discussion about each and every component of it. 28 00:02:13,666 --> 00:02:17,332 This is just to have a feel, how a template would look like. 29 00:02:17,333 --> 00:02:21,199 And within the charts folder, we will be having all the dependent charts 30 00:02:21,200 --> 00:02:23,966 This particular main charts depends on 31 00:02:23,966 --> 00:02:28,699 And this particular folder is empty and within values.yaml file 32 00:02:28,700 --> 00:02:36,300 This is going to provide the values for the templates and we can have hierarchical value, this is of json format. 33 00:02:36,300 --> 00:02:39,833 I can read any value using the key hierarchy 34 00:02:39,833 --> 00:02:45,166 We will be having detailed discussion on how to read a specific value or array of values later point 35 00:02:45,166 --> 00:02:52,499 of time and chart.yaml we will be having various information like what API version, name, description 36 00:02:52,500 --> 00:02:53,866 These three fields are mandatory 37 00:02:53,866 --> 00:02:58,099 Additional to that, we can have other fields like keywords 38 00:02:58,100 --> 00:03:03,333 type, what kube version to use and different dependencies we can add. 39 00:03:03,333 --> 00:03:06,633 And who is the maintainer and all those values are optional. 40 00:03:06,633 --> 00:03:11,333 While discussing about this specific file chart.yaml we will be having detailed discussion about 41 00:03:11,333 --> 00:03:15,933 each and every field what will get added into this particular file. 42 00:03:15,933 --> 00:03:24,633 So like this, we can have other files as well, like license, readme.md, values.yaml, values.schema.json 43 00:03:24,633 --> 00:03:28,333 crds folder and templates. So license 44 00:03:28,333 --> 00:03:32,866 It's an optional file that's going to have the license information about this particular chart and readme 45 00:03:32,866 --> 00:03:35,999 As the name suggests, it's a human readable text file where 46 00:03:36,000 --> 00:03:41,366 We will be having information about this particular chart and values.schema.json 47 00:03:41,366 --> 00:03:44,232 It's an optional file, but that's a very important file where 48 00:03:44,233 --> 00:03:50,233 It is going to derive or drive how the structure of the values.yaml file will be 49 00:03:50,233 --> 00:03:57,199 That is something like a schema definition file and another folder that we did not see it in the default chart that got created 50 00:03:57,200 --> 00:04:03,100 That is crds that's going to have the customer resources that are required for this particular chart. 51 00:04:03,100 --> 00:04:06,933 So we use the chart create command to create the chart 52 00:04:06,933 --> 00:04:13,866 And I am going to use this same folder structure and go ahead and create the chart from the beginning 53 00:04:13,866 --> 00:04:17,432 for that particular purpose I will be removing this folder. 54 00:04:17,433 --> 00:04:23,899 That is the templates folder and all its content so that I can create everything right from the beginning. 55 00:04:23,900 --> 00:04:28,433 So within templates, I do not have any content, within charts also, we don't have any content. 56 00:04:28,433 --> 00:04:34,199 So I will be going ahead and modifying the charts.yaml and values.yaml file and start 57 00:04:34,200 --> 00:04:37,600 creating our first template in our next lecture. 58 00:04:37,600 --> 00:04:43,900 So in a quick summary, we discussed about how to use helm create chart command and create the file 59 00:04:43,900 --> 00:04:49,633 structure so that we can start proceeding from this particular point to create our own custom chart.