使用cloudformation(yaml)在Ubuntu实例中启动cfn init

如果您正在使用 !Sub 您需要用 ${} 而不是使用 !Ref

试试这个

Fn::Base64: !Sub | 
  #!/bin/bash
  sudo apt-get -y install python-setuptools
  mkdir aws-cfn-bootstrap-latest
  curl https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz | tar xz -C aws-cfn-bootstrap-latest --strip-components 1
  sudo easy_install aws-cfn-bootstrap-latest
  sudo /usr/local/bin/cfn-init --stack ${AWS::StackName} --resource xxx --region ${AWS::Region}

如果指定模板参数名称或资源逻辑ID,例如 作为${InstanceTypeParameter},AWS CloudFormation返回相同的 值,就像使用了Ref内部函数一样。如果您指定 资源属性,例如${MyInstance.PublicIp},AWS CloudFormation返回的值与使用Fn::GetAtt时相同 内在功能。

有关更多详细信息,请查看 AWS - Fn::Sub

Fn::Base64: !Sub | 
  #!/bin/bash
  sudo apt-get -y install python-setuptools
  mkdir aws-cfn-bootstrap-latest
  curl https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz | tar xz -C aws-cfn-bootstrap-latest --strip-components 1
  sudo easy_install aws-cfn-bootstrap-latest
  sudo /usr/local/bin/cfn-init --stack ${AWS::StackName} --resource xxx --region ${AWS::Region}

如果easy\u install对ubuntu 18.04不起作用,请使用以下命令:

python /usr/lib/python2.7/dist-packages/easy_install.py aws-cfn-bootstrap-latest

如果找不到easy\u install命令,请尝试此操作它对我有效

"UserData": {
  "Fn::Base64": { "Fn::Join":["", [
    "#!/bin/bash\n",
    "apt-get update\n",
    "apt-get install -y python-setuptools\n",
    "mkdir -p /opt/aws/bin\n",
    "apt-get install -y wget\n",
    "wget https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-py3-latest.tar.gz\n",
    "python3 -m easy_install --script-dir /opt/aws/bin aws-cfn-bootstrap-py3-latest.tar.gz\n",
    "/usr/local/bin/cfn-init --stack ", { "Ref":"AWS::StackName" }, " --resource WebServer", " --region ", { "Ref": "AWS::Region" }, "\n",
    "\n",
    "/usr/local/bin/cfn-signal --exit-code $? '", { "Ref" : "WaitHandle" }, "'\n"
  ]]}
}