如何在Cloudformation模板中将EIP分配给VPC的Autoscaling Group

Question

我想将一个保留的弹性IP(ec2 classic ip)分配给VPC中的Autoscaling组.使用AWS Cli我将ip移至vpc:

$ aws ec2 move-address-to-vpc --public-ip 23.23.23.23

并且在aws concole中看到,这个IP传递给了VPC.并在Resources中的Cloudformation模板中分配了AutoscalingGroup的标签:

"Process": {
        "Type" : "AWS::AutoScaling::AutoScalingGroup",
        "Properties": {
            "LaunchConfigurationName": {"Ref": "PreprocessorLC"},
            "LoadBalancerNames": [{"Ref": "ProcessELB"}],
            "VPCZoneIdentifier" : [{ "Fn::Join" : [",", [ { "Ref" : "PublicSubnet1"}, { "Ref" : "PublicSubnet2"} ]]}],
            "AvailabilityZones": {"Ref": "AZs"},
            "MinSize" : "1",
            "MaxSize" : "1",
            "HealthCheckGracePeriod": 300,
            "Tags" : [
                {"Key": "Name", "Value": {"Fn::Join": ["", [{"Ref": "Env"}, "-Process"]]}, "PropagateAtLaunch": true},
                {"Key": "WorkersScalingGroup", "Value": {"Fn::Join": ["", ["Offering-", {"Ref": "Env"},  "-Process-Worker"]]}, "PropagateAtLaunch": true},
                {"Key": "EIP", "Value": {"Ref": "ProcessIP"}, "PropagateAtLaunch": true},
                {"Key": "Environment", "Value": {"Ref": "Env"}, "PropagateAtLaunch": true}
            ]
        }
    }

并在参数中增加了"ProcessIP"的值:

"ProcessIP":{
            "Description": "DEV: 23.23.23.23",
            "Type": "String",
            "Default": "23.23.23.23",
            "AllowedValues": ["23.23.23.23"]
}

它没有用.仍然获得随机IP.如果有人可以告诉我哪里错了,或者应该添加什么以使其有效？

谢谢!

Answer 1

这是简单的bash脚本:

#!/bin/sh
# Region in Which instance is running
EC2_REGION='us-east-1'
AWS_ACCESS_KEY='xxxxxxxxxxxx'
AWS_SECRET_ACCESS_KEY='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

#Instance ID captured through Instance meta data
InstanceID=`/usr/bin/curl -s http://169.254.169.254/latest/meta-data/instance-id`

#Elastic IP captured through the EIP instance tag
Elastic_IP=`/opt/aws/apitools/ec2/bin/ec2-describe-tags -O $AWS_ACCESS_KEY -W $AWS_SECRET_ACCESS_KEY --filter resource-id=$InstanceID --filter key='EIP' | cut -f5`
Allocate_ID=`/opt/aws/apitools/ec2/bin/ec2-describe-tags -O $AWS_ACCESS_KEY -W $AWS_SECRET_ACCESS_KEY --filter resource-id=$InstanceID --filter key="AllocationID" | cut -f5`

#Assigning Elastic IP to Instance
aws ec2 associate-address --instance-id $InstanceID --allocation-id $Allocate_ID

Answer 2

就我而言，我需要保留一组未分配的EIP，并在它们启动时将它们随机分配给EC2。这样，我一直知道我的服务器将使用我可以在其他地方列入白名单的特定IP列表。

如果创建几个名为“ prod-pool”的EIP，则可以使用此脚本。

apt install -y jq awscli
ALLOCATION_ID=`aws ec2 describe-addresses --filters="Name=tag:Name,Values=prod-pool" | jq -r '.Addresses[] | "\(.InstanceId) \(.AllocationId)"' | grep null | awk '{print $2}' | xargs shuf -n1 -e`

if [ ! -z $ALLOCATION_ID ]; then
    aws ec2 associate-address --instance-id $INSTANCE_ID --allocation-id $ALLOCATION_ID --allow-reassociation
fi

您可以将此政策附加到您的IAM用户

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AllowEIPAttachment",
      "Effect": "Allow",
      "Resource": [
        "*"
      ],
      "Action": [
        "ec2:AssociateAddress",
        "ec2:DisassociateAddress"
      ]
    }
  ]
}