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How to understand the chart directory structure, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

Chart is the application packaging format of Helm. Chart consists of a series of files that describe the resources needed for Kubernetes to deploy applications, such as Service, Deployment, PersistentVolumeClaim, Secret, ConfigMap, and so on.

A single chart can be very simple, only used to deploy a service, such as Memcached;chart can also be very complex, deploy the entire application, such as including HTTP Servers, Database, message middleware, cache, and so on.

Chart places these files in a predefined directory structure, and the entire chart is usually packed into tar packages and marked with version information to facilitate Helm deployment.

Below we will discuss in detail the directory structure of chart and the various files it contains.

Chart directory structure

Take the previous MySQL chart as an example. Once a chart is installed, we can find the tar package for chart in ~ / .helm/cache/archive.

After decompression, the MySQL chart directory structure is as follows:

Name and version are required, others are optional.

README.md

README file in Markdown format, equivalent to chart usage document, this file is optional.

During the installation process, the dependent chart is also installed.

Values.yaml

Chart supports customized configuration based on parameters at installation time, while values.yaml provides default values for these configuration parameters.

As with templates, configuration parameters can be inserted into NOTE.txt, and Helm injects parameter values dynamically.

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