Question

我创建了一个参数：

Parameters:
  ..
  list:
    Description: "Provide a list .." 
    Type: CommaDelimitedList
    Default: "test1, test2"

现在我想引用这个列表（将在我的cloudformation中的文件中解析＆＃34; test1＆＃34;，＆＃34; test2＆＃34;，..），如下所示：

    configure_xx:
      files:        

        /etc/file.conf:
          content: !Sub |
            input {
              logs {
                log_group => [ "${list}" ]
                access_key_id => "${logstashUserKey}"
                secret_access_key => "${logstashUserKey.SecretAccessKey}"
                region => "eu-west-1"
                }
            }

如何使这个参数列表工作？（钥匙工作）。错误：Fn::Sub expression does not resolve to a string

Answer 1

只需切换＆＃34; String＆＃34;

的参数类型

Parameters:
  ..
  list:
    Description: "Provide a list .." 
    Type: String
    Default: "test1, test2"

如果由于某种原因，您无法控制此参数类型，则可以使用Fn::Join将列表转换为字符串。例如：

configure_xx:
  files:        

    /etc/file.conf:
      content: 
        Fn::Sub:
        - |-
            input {
              logs {
                log_group => [ "${joinedlist}" ]
                access_key_id => "${logstashUserKey}"
                secret_access_key => "${logstashUserKey.SecretAccessKey}"
                region => "eu-west-1"
                }
            }
        - joinedlist:
            Fn::Join:
            - ', '
            - !Ref list

Fn :: Sub表达式无法解析为字符串

1 个答案: