Kubernetes Helm 定义多行初始化容器命令

Question

我正在尝试整理我的图表并将所有 initContainers 迁移到名为图表 _scripts.tlp.

的助手中

我在 proxy-deployment.yaml 中有一个 initContainers 步骤，它正在等待我的代理服务像这样初始化：

      # 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有空格分界，我看到了 error converting YAML to JSON: yaml。

我尝试了 printf 的几种变体，但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 -}}

代理-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" . | indent 10 }}

起初，我无法弄清楚为什么 include 不起作用，所以我使用 squote 命令的组合来找出对齐方式，然后你可以添加 replace 检查模板是否真的有效：

` {{- 包括 "pulsar.waitBrokerReady" 。 |报价 |缩进 10 |替换 "'" "" }}

一次，它做模板，你可以删除squote和replace。

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