由于专用IP，aws堆栈中的循环依赖性[AWS CloudFormation] [英] Circular dependency in aws stack because of private ip [AWS CloudFormation]

问题描述

我正在使用cloudformation模板创建EC2实例。在userdata部分中，我需要运行在元数据中创建的shell文件。对于该外壳文件，我将实例的私有ip作为参数传递。
我要使用以下私有IP：

I am using a cloudformation template to create my EC2 instance. In userdata section i need to run a shell file that i have created in metadata. For that shell file i am passing private ip of the instance as a parameter. To get the private ip i am using this :

{
    "Fn::GetAtt" : [ "ConsoleServer", "PrivateIp" ]
},      

我请等待处理程序我的用户数据被执行时等待，但是等待处理程序取决于我尝试配置的EC2。

i ask the wait handler to wait while my user data gets executed but the wait handeler is dependent on the EC2 that i am trying to configure.

这引起了特殊的依赖关系，但我无法理解如何使用其他方式获取实例的私有IP？

This is causing cicular dependency but i am unable to understand how to get private ip of the instance using some other way ?

下面是重要的部分：元数据

 "Resources": {
        "ConsoleServer": {
            "Type": "AWS::EC2::Instance",
            "Metadata": {
                "AWS::CloudFormation::Init": {
                    "config": {
                        "files": {
                            "/usr/local/share/deployment-script.sh": {
                                "mode": "755",
                                "owner": "ec2-user",
                                "group": "ec2-user",
                                "content": {
                                    "Fn::Join": [
                                        "",
                                        [
                                            "#!/bin/bash\n",
                                            "sh master.sh ",
                                            {
                                                "Ref": "S3ConsoleZip"
                                            }, " ",
                                            {
                                                "Fn::GetAtt" : [ "ConsoleServer", "PrivateIp" ]
                                            },

这是我的 userdata 部分，后跟 waithandler

 "UserData": {
                    "Fn::Base64": {
                        "Fn::Join": [
                            "",
                            [
                                "#!/bin/bash -v\n",
                                "sudo su",
                                "\n",
                                "chmod -R 775 /usr/local/share\n",

                                "yum update -y aws-cfn-bootstrap\n",
                                "## Error reporting helper function\n",
                                "function error_exit\n",
                                "{\n",
                                "   /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '",
                                {
                                    "Ref": "WaitHandleServer"
                                },
                                "'\n",
                                "   exit 1\n",
                                "}\n",
                                "## Initialize CloudFormation bits\n",
                                "/opt/aws/bin/cfn-init -v -s ",
                                {
                                    "Ref": "AWS::StackName"
                                },
                                " -r ConsoleServer",
                                "   --region ",
                                {
                                    "Ref": "AWS::Region"
                                },
                                " > /tmp/cfn-init.log 2>&1 || error_exit $(</tmp/cfn-init.log)\n",
                                "cd /usr/local/share\n",
                  *********              "sh deployment-script.sh >> /home/ec2-user/deployment-script.log\n",
                                "/opt/aws/bin/cfn-signal",
                                " -e 0",
                                " '",
                                {
                                    "Ref": "WaitHandleServer"
                                },
                                "'",
                                "\n",
                                "date > /home/ec2-user/stoptime"
                            ]
                        ]
                    }
                }
            }
        },
        "WaitHandleServer": {
            "Type": "AWS::CloudFormation::WaitConditionHandle"
        },
        "WaitConditionServer": {
            "Type": "AWS::CloudFormation::WaitCondition",
            "DependsOn": "ConsoleServer",
            "Properties": {
                "Handle": {
                    "Ref": "WaitHandleServer"
                },
                "Timeout": "1200"
            }
        }
    },

我添加了*********，其中正在从用户数据部分进行调用

i have added ********* where call is being made from user data section

推荐答案

EC2 IP地址，您可以通过在脚本内使用 curl 调用此API来获取它：

To get EC2 IP address, you can get it by call this API using curl inside your script:

curl http://169.254.169.254/latest/meta-data/local-ipv4

了解有关实例元数据和用户数据。

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