测试
- 测试1
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
end }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug2: true
{
{
end }}
渲染效果1
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: true
#空行
#空行
mug2: true
#空行
#空行
- 测试2
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
end }}
{
{
- if eq .Values.favorite.drink "coffee" }}
mug2: true
{
{
end }}
渲染效果2
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: true
#空行
mug2: true
#空行
#空行
- 测试3
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
end }}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
end }}
渲染效果3
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: true
mug2: true
#空行
#空行
- 测试4
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
end }}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
- end }}
渲染效果4
# Source: mychart/templates/cmdemo.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: release-name-configmap
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: true
mug2: true
#空行
- 测试5
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
end }}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
- end -}}
渲染效果5
# Source: mychart/templates/cmdemo.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: release-name-configmap
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: true
mug2: true
- 测试6
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
- end -}}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
- end -}}
渲染效果6
# Source: mychart/templates/cmdemo.yaml
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
#空行
mug1: truemug2: true
- 测试7
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
- if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
- end -}}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
- end -}}
渲染效果7
# Source: mychart/templates/cmdemo.yaml
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
mug1: truemug2: true
- 测试8
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug1: true
{
{
- end -}}
{
{
- if eq .Values.favorite.drink "coffee" -}}
mug2: true
{
{
- end -}}
渲染效果8
# Source: mychart/templates/cmdemo.yaml
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"mug1: truemug2: true
- 测试9
apiVersion: v1
kind: ConfigMap
metadata:
name: {
{
.Release.Name }}-configmap
data:
myvalue: "Hello World"
drink: {
{
.Values.favorite.drink | default "tea" | quote }}
food: {
{
.Values.favorite.food | upper | quote }}
{
{
- if eq .Values.favorite.drink "coffee" }}
mug1: true
{
{
- end }}
{
{
- if eq .Values.favorite.drink "coffee" }}
mug2: true
{
{
- end -}}
渲染效果9
data:
myvalue: "Hello World"
drink: "coffee"
food: "PIZZA"
mug1: true
mug2: true
结论
- 总结
1、一个
{ { and }}符号占用一个空行
2、{ {- and }}消除左边产生的空行，即上面产生的空行
3、{ { and -}}消除右边产生的空行，即下面面产生的空行
4、多个{ { and }}时，注意只是用一个-号确保正确，最后一个{ { and }}要加入两个-消除尾部的空行，见测试9
helm官网解释
Notice that we received a few empty lines in our YAML. Why? When the template engine runs, it removes the contents inside of { { and }}, but it leaves the remaining whitespace exactly as is.
YAML ascribes meaning to whitespace, so managing the whitespace becomes pretty important. Fortunately, Helm templates have a few tools to help.
First, the curly brace syntax of template declarations can be modified with special characters to tell the template engine to chomp whitespace. { {- (with the dash and space added) indicates that whitespace should be chomped left, while -}} means whitespace to the right should be consumed. Be careful! Newlines are whitespace!
Make sure there is a space between the - and the rest of your directive. { {- 3 }} means "trim left whitespace and print 3" while { {-3 }} means "print -3".