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[英]How to use !Sub or !Join in "AWS::CloudFormation::Init", file key
[英]How to create a file without any content using CloudFormation Init?
我想要一個由 CloudFormation 創建的空文件。
我嘗試在我的 CloudFormation 模板 yaml 文件的“內容”字段中提供一個空字符串。
Resources:
Instance:
Type: AWS::EC2::Instance
Metadata:
AWS::CloudFormation::Init:
config:
files:
/var/log/app.log:
content: ""
mode: '000646'
我收到以下錯誤: File specified without source or content
2023-01-10 14:32:55,132 [DEBUG] Writing content to /var/log/app.log
2023-01-10 14:32:55,132 [ERROR] Error encountered during build of config: File specified without source or content
Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 579, in run_config
CloudFormationCarpenter(config, self._auth_config, self.strict_mode).build(worklog)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 267, in build
self._config.files, self._auth_config)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/file_tool.py", line 131, in apply
self._write_file(f, attribs, auth_config)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/file_tool.py", line 221, in _write_file
raise ToolError("File specified without source or content")
cfnbootstrap.construction_errors.ToolError: File specified without source or content
2023-01-10 14:32:55,137 [ERROR] -----------------------BUILD FAILED!------------------------
2023-01-10 14:32:55,137 [ERROR] Unhandled exception during build: File specified without source or content
Traceback (most recent call last):
File "/opt/aws/bin/cfn-init", line 181, in <module>
worklog.build(metadata, configSets, strict_mode)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 137, in build
Contractor(metadata, strict_mode).build(configSets, self)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 567, in build
self.run_config(config, worklog)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 579, in run_config
CloudFormationCarpenter(config, self._auth_config, self.strict_mode).build(worklog)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/construction.py", line 267, in build
self._config.files, self._auth_config)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/file_tool.py", line 131, in apply
self._write_file(f, attribs, auth_config)
File "/usr/lib/python3.7/site-packages/cfnbootstrap/file_tool.py", line 221, in _write_file
raise ToolError("File specified without source or content")
cfnbootstrap.construction_errors.ToolError: File specified without source or content
如果我省略“內容”字段,我會得到同樣的錯誤。
你能告訴我指示 CloudFormation 創建空文件的正確方法嗎?
您需要指定一個內容。 如果你真的想創建一個空文件,那么我建議使用commands 。
正如brushtakopo指出的那樣,CloudFormation Init 不支持創建空文件,因此唯一的選擇似乎是使用命令。
我只是想包含相應的命令,因為他沒有在他的回答中包含它。
Resources:
Instance:
Type: AWS::EC2::Instance
Metadata:
AWS::CloudFormation::Init:
config:
commands:
a_createLogFile:
command: "touch /var/log/app.log"
test: "test ! -e /var/log/app.log"
b_chmodLogFile:
command: "chmod 646 /var/log/app.log"
test: "test -e /var/log/app.log"
注意:以a_
為前綴的命令創建文件,以b_
為前綴的命令更改其訪問權限。 前綴是為了確保第一個命令在第二個命令之前執行,因為 CloudFormation 按字母順序執行命令。
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-init.html
命令按名稱的字母順序處理。
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