访问依赖项的 helm 上下文

Question

我们正在使用这张图表：

apiVersion: v2
appVersion: 1.0
version: 0.0.1
description: Helm chart for setting up Kafka platform (Kafka, Zookeeper, Kafka Rest, Kafka Schema Registry, Kafka Connect, KSQL Server)
name: kafka-platform

dependencies:
  - name: cp-helm-charts
    version: 0.6.0
    repository: "https://confluentinc.github.io/cp-helm-charts"

我们需要创建 public 图表中不存在的新本地模板，并且这个新模板应该访问 public 图表中定义的内置变量。例如，.Chart.Name

apiVersion: v1
appVersion: "1.0"
description: A Helm chart for Confluent Kafka on Kubernetes
name: cp-kafka
version: 0.1.0

我们如何从本地 .tpl 命名模板或模板访问“cp-kafka”？我现在设法访问的是类型错误“<.Chart.Name>：无法评估 int 类型的字段图表”或本地图表“kafka-platform”的值。

我已经搜索过这个question/answer，但虽然我看到了相似的东西，但我没有找到完全适合或回答这个确切问题的东西。

Answer 1

可以使用子图映射。

{{ $sub := index .Subcharts "cp-kafka" }}

这将为您提供所有内置变量，甚至是值文件中的 .Values。

比如我创建一个图表和一个子图表：

helm create foo
helm create foo/charts/bar
rm -rf foo/templates/*
rm -rf foo/charts/bar/templates/*

在条值中，我输入了这个：

some:
  values: from
  this: subchart

在 foo 模板中，我放置了这个配置映射：

kind: ConfigMap
apiVersion: v1
metadata:
  name: example
data:
  bar-chart: |
    {{- .Subcharts.bar | toYaml | nindent 4 }}

现在，当我使用 helm template foo 渲染图表时，我得到以下输出：

---
# Source: foo/templates/cm.yaml
kind: ConfigMap
apiVersion: v1
metadata:
  name: example
data:
  bar-chart: |
    Capabilities:
      APIVersions:
      - v1
      - admissionregistration.k8s.io/v1
      - admissionregistration.k8s.io/v1beta1
      - internal.apiserver.k8s.io/v1alpha1
      - apps/v1
      - apps/v1beta1
      - apps/v1beta2
      - authentication.k8s.io/v1
      - authentication.k8s.io/v1beta1
      - authorization.k8s.io/v1
      - authorization.k8s.io/v1beta1
      - autoscaling/v1
      - autoscaling/v2
      - autoscaling/v2beta1
      - autoscaling/v2beta2
      - batch/v1
      - batch/v1beta1
      - certificates.k8s.io/v1
      - certificates.k8s.io/v1beta1
      - coordination.k8s.io/v1beta1
      - coordination.k8s.io/v1
      - discovery.k8s.io/v1
      - discovery.k8s.io/v1beta1
      - events.k8s.io/v1
      - events.k8s.io/v1beta1
      - extensions/v1beta1
      - flowcontrol.apiserver.k8s.io/v1alpha1
      - flowcontrol.apiserver.k8s.io/v1beta1
      - flowcontrol.apiserver.k8s.io/v1beta2
      - networking.k8s.io/v1
      - networking.k8s.io/v1beta1
      - node.k8s.io/v1
      - node.k8s.io/v1alpha1
      - node.k8s.io/v1beta1
      - policy/v1
      - policy/v1beta1
      - rbac.authorization.k8s.io/v1
      - rbac.authorization.k8s.io/v1beta1
      - rbac.authorization.k8s.io/v1alpha1
      - scheduling.k8s.io/v1alpha1
      - scheduling.k8s.io/v1beta1
      - scheduling.k8s.io/v1
      - storage.k8s.io/v1beta1
      - storage.k8s.io/v1
      - storage.k8s.io/v1alpha1
      - apiextensions.k8s.io/v1beta1
      - apiextensions.k8s.io/v1
      HelmVersion:
        git_commit: 6e3701edea09e5d55a8ca2aae03a68917630e91b
        git_tree_state: clean
        go_version: go1.17.5
        version: v3.8.2
      KubeVersion:
        Major: "1"
        Minor: "23"
        Version: v1.23.0
    Chart:
      IsRoot: false
      apiVersion: v2
      appVersion: 1.16.0
      description: A Helm chart for Kubernetes
      name: bar
      type: application
      version: 0.1.0
    Files:
      .helmignore: IyBQYXR0ZXJucyB0byBpZ25vcmUgd2hlbiBidWlsZGluZyBwYWNrYWdlcy4KIyBUaGlzIHN1cHBvcnRzIHNoZWxsIGdsb2IgbWF0Y2hpbmcsIHJlbGF0aXZlIHBhdGggbWF0Y2hpbmcsIGFuZAojIG5lZ2F0aW9uIChwcmVmaXhlZCB3aXRoICEpLiBPbmx5IG9uZSBwYXR0ZXJuIHBlciBsaW5lLgouRFNfU3RvcmUKIyBDb21tb24gVkNTIGRpcnMKLmdpdC8KLmdpdGlnbm9yZQouYnpyLwouYnpyaWdub3JlCi5oZy8KLmhnaWdub3JlCi5zdm4vCiMgQ29tbW9uIGJhY2t1cCBmaWxlcwoqLnN3cAoqLmJhawoqLnRtcAoqLm9yaWcKKn4KIyBWYXJpb3VzIElERXMKLnByb2plY3QKLmlkZWEvCioudG1wcm9qCi52c2NvZGUvCg==
    Release:
      IsInstall: true
      IsUpgrade: false
      Name: release-name
      Namespace: default
      Revision: 1
      Service: Helm
    Subcharts: {}
    Values:
      global: {}
      some:
        this: subchart
        values: from

访问依赖项的 helm 上下文

Access helm context of dependencies

kubernetes

kubernetes-helm