Kubernetes Helm定义多行初始化容器命令

Question

我正在尝试整理图表并将所有initContainers迁移到名为图表_ scripts.tlp的帮助器中。

我在proxy-deployment.yaml中有一个initContainers步骤，该步骤一直等到我的经纪人服务这样初始化：

      # This init container will wait for at least one broker to be ready before proceeding
      # with deploying the rest of the proxy service
      - name: wait-broker-ready
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
        imagePullPolicy: {{ .Values.image.pullPolicy }}
        command: ["bash", "-c"]
        args:
          - >-
            for i in {0..10}; do
              broker_pods="$(nslookup -timeout=10 {{ template "service.fullname" . }}-{{ .Values.broker.component }} | grep Name | wc -l)"
              if [[ ${broker_pods} -ge 1 ]]; then
                break
              fi
              sleep 30;
            done;

我正在尝试像这样重写它：

      # This init container will wait for at least one broker to be ready before proceeding
      # with deploying the rest of the proxy service
      - name: wait-broker-ready
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
        imagePullPolicy: {{ .Values.image.pullPolicy }}
        command: ["bash", "-c"]
        args:
          - >-
            {{ template  "service.waitBrokerReady"}}

我有以下名称模板_ scripts.tlp：

{{/*
Wait until at least one broker instances is initialized
*/}}
{{ define "service.waitBrokerReady" }}
for i in {0..10}; do
  broker_pods="$(nslookup -timeout=10 {{ template "service.fullname" . }}-{{ .Values.broker.component }} | grep Name | wc -l)"
  if [[ ${broker_pods} -ge 1 ]]; then
    break
  fi
  sleep 30;
done;
{{- end }}

[不幸的是，这是一个多行命令，并且存在空格分隔的事实，我看到了error converting YAML to JSON: yaml。

我已经尝试过使用printf进行多种变体，但是不确定如何传递嵌套模板，并且经常看到Error: parse error at (service/templates/_functions.tpl:6): "-p" in command。

Answer 1

以下解决方案似乎对我有用：

__ scripts.tlp：

{{/*
Wait until at least one broker instances is initialized
*/}}
{{- define "service.waitBrokerReady" }}
- >-
  for i in {0..10}; do
    broker_pods="$(nslookup -timeout=10 {{ template "service.fullname" . }}-{{ .Values.broker.component }} | grep Name | wc -l)"
    if [[ ${broker_pods} -ge 1 ]]; then
      break
    fi
    sleep 30;
  done;
{{- end -}}

proxy-deployment.yaml：

      # This init container will wait for at least one broker to be ready before proceeding
      # with deploying the rest of the proxy service
      - name: wait-broker-ready
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
        imagePullPolicy: {{ .Values.image.pullPolicy }}
        command: ["bash", "-c"]
        args:
            {{- include "pulsar.waitBrokerReady" . | squote | indent 10 | replace "'" "" }}