Setting Values during Installation

Helm chart default values

Most Helm charts can be installed with a simple command in which we only specify the name of a chart and a release. But what if it’s not enough and we need to have a different version of an application than the latest? Or if our incoming traffic is so heavy that we require two or more instances of the same application?

Luckily, there is a solution to this and other similar problems: the values.yaml file. Each Helm chart should have it. It plays the role of a chart’s interface that is used to interact with it. It’s essentially a YAML file that contains several properties which we can change to tweak a Helm release. All of them are declared in the file with the default values.