如何基于Helm Values中multiPod变量生成不同名称的ConfigMap？

需要根据Values文件中的multiPod变量生成不同名称的ConfigMap：

• 当multiPod设为true时，基于region列表生成对应数量的ConfigMap
• 当multiPod设为false时，基于父级key（如storage、compute）生成单个ConfigMap

现有ConfigMap模板（templates/configmap.yaml） #

{{- range $keys, $values := $.Values.topicsToRead }}

{{- if $values.multiPod }}
{{- range $values.region }}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-{{ . }}
data:
  features.toml: |
    [features]
    x_enabled = false
{{- end -}}
{{- end }}
{{- end }}

Values.yaml配置 #

topicsToRead:
  compute:
    multiPod: true
    region:
      - region815
      - region816
      - region817
  storage:
    multiPod: false
    region:
      - region715
      - region716
      - region717

当前执行结果 #

执行命令 helm template -s templates/configmap.yaml . 后输出：

---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region815
data:
  features.toml: |
    [features]
    x_enabled = false
---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region816
data:
  features.toml: |
    [features]
    x_enabled = false
---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region817
data:
  features.toml: |
    [features]
    x_enabled = false

期望输出 #

---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region815
data:
  features.toml: |
    [features]
    x_enabled = false
---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region816
data:
  features.toml: |
    [features]
    x_enabled = false
---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-region817
data:
  features.toml: |
    [features]
    x_enabled = false
---
# Source: helm-chart/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-storage
data:
  features.toml: |
    [features]
    x_enabled = false

修改ConfigMap模板，添加else分支处理multiPod: false的场景，使用遍历得到的$keys作为ConfigMap名称的后缀：

{{- range $keys, $values := $.Values.topicsToRead }}

{{- if $values.multiPod }}
{{- range $values.region }}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-{{ . }}
data:
  features.toml: |
    [features]
    x_enabled = false
{{- end -}}
{{- else }}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-{{ $keys }}
data:
  features.toml: |
    [features]
    x_enabled = false
{{- end }}
{{- end }}

修改后重新执行helm template -s templates/configmap.yaml .，即可得到期望的输出。

内容的提问来源于stack exchange，提问作者Raghavendra