1 00:00:00,000 --> 00:00:07,533 Hi, Let's understand about sub charts. Charts is a separate entity where 2 00:00:07,533 --> 00:00:10,699 It will be having collection of templates and values 3 00:00:10,700 --> 00:00:16,566 It can be packaged together, shared it within a repository as well as send it as a package to the 4 00:00:16,566 --> 00:00:21,566 external world and within charts. I can have n number of sub charts. 5 00:00:21,566 --> 00:00:26,232 Again, the subcharts will be having a collection of templates and values and the same hierarchy 6 00:00:26,233 --> 00:00:28,433 How we have within the charts. 7 00:00:28,433 --> 00:00:30,199 Let's understand through a demo. 8 00:00:30,200 --> 00:00:35,366 Let me get into the sample chart that we have, within that we do have charts folder. 9 00:00:35,366 --> 00:00:38,266 I'm going to get into the charts folder, within charts folder 10 00:00:38,266 --> 00:00:40,532 I'm going to create a subchart. 11 00:00:40,533 --> 00:00:47,033 The name of the subchart I'll give it is mysubchart and I will use helm create command, helm create 12 00:00:47,033 --> 00:00:51,899 mysubchart. So within charts it's going to create a folder. 13 00:00:51,900 --> 00:00:54,300 mysubchart and like this I can have 14 00:00:54,300 --> 00:00:58,800 n number of charts within it and within the folder 15 00:00:58,800 --> 00:01:01,300 By default it is going to create a project 16 00:01:01,300 --> 00:01:04,033 And within that it's going to create the collection of required folders 17 00:01:04,033 --> 00:01:06,799 And it's going to create the sample templates 18 00:01:06,800 --> 00:01:09,800 And that will be available within the templates. 19 00:01:09,800 --> 00:01:16,666 So within templates, I'm going to have all the sample manifest file for that particular sample chart. 20 00:01:16,666 --> 00:01:20,732 Now I'm going to remove all this so that I can create right from the beginning. 21 00:01:20,733 --> 00:01:23,199 Everything is a removed. 22 00:01:23,200 --> 00:01:29,033 Within mychart I am having mysubchart as another subchart. Within mysubchart 23 00:01:29,033 --> 00:01:35,499 I'm going to add some values. 24 00:01:35,500 --> 00:01:39,933 I delete all the values within the values file as well. 25 00:01:39,933 --> 00:01:42,633 I'm going to add a sample key value pair. 26 00:01:42,633 --> 00:01:49,533 I'm adding a key value pair named dbhostname as key and mysql node known as value. 27 00:01:49,533 --> 00:01:53,633 Now let me go ahead and create a template. 28 00:01:53,633 --> 00:01:54,666 I don't have any files. 29 00:01:54,666 --> 00:02:02,599 I'm going to create a file called config map.yaml, let me add some sample content within it. 30 00:02:02,600 --> 00:02:06,200 So this is going to create a config map where the name 31 00:02:06,200 --> 00:02:11,466 It will have the release name and as a part of the dbhost key its going to have the value 32 00:02:11,466 --> 00:02:17,066 from the values file so it will read the value with the key dbhost name. 33 00:02:17,066 --> 00:02:20,666 Now I can try only this specific subchart. 34 00:02:20,666 --> 00:02:27,166 Let me get into the parent directory mychart here I do have the project mychart 35 00:02:27,166 --> 00:02:31,332 I'm going to do a dry run on my subchart. 36 00:02:31,333 --> 00:02:38,599 If you observe over here, here I have given the entire path within the chart that my subchart directory I have provided. 37 00:02:38,600 --> 00:02:44,733 So it's going to do a dry run and process the values file and generate the manifest file and it replaced 38 00:02:44,733 --> 00:02:50,666 the dbhost with the value that we provided as a part of the values file. 39 00:02:50,666 --> 00:02:53,032 So this is going to work as a separate entity 40 00:02:53,033 --> 00:02:56,099 And like this, I can have n number of subcharts 41 00:02:56,100 --> 00:03:02,633 And in case, if I wanted to override this particular value from the parent directory I can very well 42 00:03:02,633 --> 00:03:07,599 do that. Let me give a try within mychart 43 00:03:07,600 --> 00:03:11,433 I am going to update the values file. So within values file 44 00:03:11,433 --> 00:03:17,099 I'm going to add or inject values to the subchart 45 00:03:17,100 --> 00:03:21,266 So I'm having a collection, mysubchart the key dbhostname. 46 00:03:21,266 --> 00:03:26,799 And I'm providing the value as prod mysql node as the value. 47 00:03:26,800 --> 00:03:32,733 Now, let me go ahead and build the mychart and see how the value is getting generated. 48 00:03:32,733 --> 00:03:39,933 This time I'm going to do a dry run against mychart and mychart is providing the value to the subchart as well. 49 00:03:39,933 --> 00:03:43,733 So if I look into the computed values mysubchart 50 00:03:43,733 --> 00:03:47,266 It's having prodmysqlnode 51 00:03:47,266 --> 00:03:54,399 And this is the value that it calculated within the sub chart because that is coming from the parent 52 00:03:54,400 --> 00:03:58,300 So the computed value, it's being provided from the parent chart 53 00:03:58,300 --> 00:04:01,700 And that will be fed into the mysubchart 54 00:04:01,700 --> 00:04:04,733 And mysubchart got the prodmysqlnode 55 00:04:04,733 --> 00:04:07,466 And that is from the parent chart. 56 00:04:07,466 --> 00:04:13,132 So this is how I can override the value that needs to be provided to the subchart as well 57 00:04:13,133 --> 00:04:18,298 And there is another concept called global values that we will be discussing it in the next lecture. 58 00:04:18,300 --> 00:04:21,766 So in a quick summary we have seen how to create subchart and override 59 00:04:21,766 --> 00:04:25,132 The value of the subchart from the parent chart.