doulan6150
2017-09-15 08:59
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如何比较Go模板中的字符串?

I'd like to show entries that have .metadata.labels.app set to "myapp"value.

Command:

kubectl get pods -o go-template --template="{{range .items}}{{if eq .metadata.labels.app "myapp"}}{{.metadata.name}} {{end}}{{end}}"

It gives an error:

output:1: function "myapp" not defined

The structures look like this:

- apiVersion: v1
  kind: Pod
  metadata:
    creationTimestamp: 2017-09-15T08:18:26Z
    generateName: myapp-2830765207-
    labels:
      app: myapp
      pod-template-hash: "2830765207"
    name: myapp-2830765207-dh359
    namespace: default

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我想显示将 .metadata.labels.app 设置为 “ myapp” 值。

命令:

  kubectl get pods -o go-template --template  =“ {{{range .items}} {{if eq .metadata.labels.app” myapp“}} {{。metadata.name}} {{end}} {{end}}” 
  <  / pre> 
 
 

它给出一个错误:

输出:1:未定义函数“ myapp”

结构看起来像这样:

 -apiVersion:v1 
种类:Pod 
元数据:
 creationTimestamp:2017-09-15T08  :18:26Z 
 generateName:myapp-2830765207- 
标签:
 app:myapp 
 pod-template-hash:“ 2830765207” 
名称:myapp-2830765207-dh359 
命名空间:默认
   
 
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1条回答 默认 最新

  • dongrunying7537 2017-09-15 09:04
    最佳回答

    I haven't used kubetcl before, but I am familiar with shell commands in general, from which I can tell you one thing that's going wrong, and maybe that's all you need. (I'm also somewhat familiar with Go templates, and your string comparison looks fine to me.) By using double quotes around your template and within your template, you're actually closing the string you're passing in as the template at the first double quote in "myapp". Using single quotes around the template should help:

    kubectl get pods -o go-template --template='{{range .items}}{{if eq .metadata.labels.app "myapp"}}{{.metadata.name}} {{end}}{{end}}'
    
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