Kubernetes Helm define multiline init container command

Question

我正在尝试组织我的图表并将所有initContainers迁移到名为 chart_scripts.tlp的帮助程序中。

我在proxy-deployment.yaml中有一个initContainers步骤，它正在等待，直到我的代理服务初始化如下：

# 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;

我试图像这样重写它：

# 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有空格划分的事实，我看到error converting YAML to JSON: yaml.

我已经尝试了几种printf变体，但不确定如何传递嵌套模板并经常看到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" . | indent 10 }}

起初，我无法弄清楚为什么包含不起作用，所以我使用squote命令的组合来确定对齐方式，然后您可以添加replace来检查模板是否真的有效：

' {{- include "pulsar.waitBrokerReady" . | squote | 缩进 10 | 替换 "'" " }}

一旦，它做模板，你可以删除squote和replace。