一、trim

trim行数移除字符串两边的空格

trim "   hello    "

上述结果为： hello

下面进行举例说明

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# cd /root/helm-test/templates
[root@k8s-master01 templates]# vim configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  myvalue: "Hello World"
  trim: {{ .Values.myValue | trim }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "   Hello  "

5.进行验证，观察到输出结果为Hello

[root@k8s-master01 helm-test]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 14:38:19 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  myvalue: "Hello World"
  trim: Hello

二、trimAll

从字符串中移除给定的字符

trimAll "$" "$5.00"

上述结果为：5.00 (作为一个字符串)。

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# cd /root/helm-test/templates
[root@k8s-master01 templates]# vim configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | trimAll "$" }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "$5.00"

5.进行验证，观察到输出结果为5.00

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 14:50:07 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: 5.00

三、trimSuffix

从字符串中移除后缀

trimSuffix "-" "hello-"

上述结果为： hello

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | trimSuffix "-"  }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "hello-"

5.进行验证，观察到输出结果为hello

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: hello

四、trimPrefix

从字符串中移除前缀

trimPrefix "-" "-hello"

上述结果为：hello

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | trimPrefix "-" }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "-hello"

5.进行验证，观察到输出结果为hello

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: hello

五、upper

将整个字符串转换成大写

upper "hello"

上述结果为： HELLO

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | upper }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "hello"

5.进行验证，观察到输出结果为HELLO

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: HELLO

六、lower

将整个字符串转换成小写

lower "HELLO"

上述结果为： hello

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | lower }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "HELLO"

5.进行验证，观察到输出结果为hello

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: hello

七、title

首字母转换成大写

title "hello"

上述结果为：Hello

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | title }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "hello"

5.进行验证，观察到输出结果为Hello

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: Hello

八、untitle

移除首字母大写：untitle "Hello World" 会得到 hello world

下面进行举例说明:

1.创建一个Chart

$ helm create helm-test

2.删掉系统自带的模板文件

[root@k8s-master01 ~]# rm -rf /root/helm-test/templates/*

3.新增模板文件，并填写Release.Name内置变量

[root@k8s-master01 ~]# vim /root/helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  trim: {{ .Values.myValue | untitle }}

4.清空values.yaml文件，并添加以下内容

[root@k8s-master01 ~]# > /root/helm-test/values.yaml
[root@k8s-master01 ~]# vim /root/helm-test/values.yaml
myValue: "Hello"

5.进行验证，观察到输出结果为hello

[root@k8s-master01 templates]# helm install aaa /root/helm-test/  --dry-run
NAME: aaa
LAST DEPLOYED: Sun Jul  9 15:02:04 2023
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: helm-test/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: aaa-configmap
data:
  trim: hello