Helm template variables

In addition to leveraging values and other built-in objects, chart developers can create variables of their own within chart templates to provide additional processing options. A common use case for this approach is flow control, but template variables can serve other use cases as well.

A variable in a chart template is defined as follows:

{{ $myvar := "Hello World!" }}

The preceding example creates a variable called myvar and sets the value to a string equaling to Hello World!. Variables can be assigned to objects as well, such as a chart’s values, as illustrated here:

{{ $myvar := .Values.greeting }}

Once a variable is defined, it can be referenced in the following way:

data:
  greeting.txt: |-
    {{ $myvar }}

Another example of using variables is in a range block, where variables capture the index and value of list iterations, as illustrated in the following code snippet:

data:
 ...