[英]Helm _helpers.tpl: Calling defined templates in other template definitions
Helm allows for the use of Go templating in resource files for Kubernetes. Helm允许在Kubernetes的资源文件中使用Go模板 。
A file named _helpers.tpl
is usually used to define Go template helpers with this syntax: 名为_helpers.tpl
的文件通常用于使用以下语法定义Go模板助手:
{{- define "yourFnName" -}}
{{- printf "%s-%s" .Values.name .Values.version | trunc 63 -}}
{{- end -}}
Which you can then use in your *.yaml
resource files like so: 然后您可以在*.yaml
资源文件中使用它,如下所示:
{{ template "yourFnName" . }}
How can I use the helpers I define, in other helper definitions? 如何在其他帮助程序定义中使用我定义的帮助程序?
For example, what if I have a helper for the application name, and want to use that in the definition for a helper which determines the ingress host name? 例如,如果我有一个应用程序名称的帮助程序,并希望在定义中使用它来确定入口主机名?
I have tried calling helpers in other definitions a couple different ways. 我尝试过几种不同的方式在其他定义中调用助手。 Given this basic helper function: 鉴于此基本辅助功能:
{{- define "host" -}}
{{- printf "%.example.com" <Somehow get result of "name" helper here> -}}
{{- end -}}
I have tried the following: 我尝试过以下方法:
{{- printf "%.example.com" {{ template "name" . }} -}}
{{- printf "%.example.com" {{- template "name" . -}} -}}
{{- printf "%.example.com" ( template "name" . ) -}}
{{- printf "%.example.com" template "name" . -}}
# Separator
{{- $name := {{ template "environment" . }} -}}
{{- printf "%.example.com" $name -}}
# Separator
{{- $name := template "environment" . -}}
{{- printf "%.example.com" $name -}}
# Separator
{{- $name := environment -}}
{{- printf "%.example.com" $name -}}
Is it possible to even do this? 有可能做到这一点吗? If so, how? 如果是这样,怎么样?
You should use Nested template definitions . 您应该使用嵌套模板定义 。
In your particular case it is: 在您的特定情况下,它是:
{{- define "host" -}}
{{ template "name" . }}.example.com
{{- end -}}
You can use (include ... )
syntax. 您可以使用(include ... )
语法。 Example of including previously defined template foo
: 包含先前定义的模板foo
示例:
{{- define "bar" -}}
{{- printf "%s-%s" (include "foo" .) .Release.Namespace | trunc 63 | trimSuffix "-" -}}
{{- end -}}
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