英文:
What does & and * denote in a helm template?
问题
& 在 helm 模板中表示引用一个标签或值。* 在 helm 模板中表示将一个标签或值展开为多个键值对。
英文:
What does & and * denote in a helm template?
apiVersion: apps/v1kind: Deploymentmetadata:name: {{ template "seleniumGrid.chromeNode.fullname" . }}namespace: {{ .Release.Namespace }}labels: &chrome_node_labels //**& here**app: selenium-chrome-nodeapp.kubernetes.io/name: selenium-chrome-node{{- include "seleniumGrid.commonLabels" . | nindent 4 }}{{- with .Values.chromeNode.labels }}{{- toYaml . | nindent 4 }}{{- end }}{{- with .Values.customLabels }}{{- toYaml . | nindent 4 }}{{- end }}spec:replicas: {{ .Values.chromeNode.replicas }}selector:matchLabels:app: selenium-chrome-nodeapp.kubernetes.io/instance: {{ .Release.Name }}template:metadata:labels: *chrome_node_labels // **star here **annotations:
答案1
得分: 1
这看起来像是使用了YAML锚点，但我记得如果直接在Helm模板中使用会导致错误。我猜他们可能在这里进行了第二次渲染，先解析了YAML。
锚点和别名。这包括两个部分：
-
锚点
&用于定义一块配置 -
别名
*用于在其他地方引用该配置块
因此，在下面的示例中，我们使用 &build-test 来定义一个步骤实体，它包含了多行可重用的配置，然后使用别名 *build-test 进行引用。
definitions:steps:- step: &build-testname: 构建和测试script:- mvn packageartifacts:- target/**pipelines:branches:develop:- step: *build-testmain:- step: *build-test
英文:
This looks like the usage of YAML anchors, but I remember it would result in an error if used directly in the Helm templates. I guess they might be doing a second rendering here, where the YAML is parsed first.
Anchors and aliases. There are 2 parts to this:
-
The anchor
&which defines a chunk of configuration -
The alias
*used to refer to that chunk elsewhere
So in the example below we use &build-test to define a step entity, which has several lines for reuse, and the alias *build-test to reuse it.
definitions:steps:- step: &build-testname: Build and testscript:- mvn packageartifacts:- target/**pipelines:branches:develop:- step: *build-testmain:- step: *build-test
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