我得到elb的循环依赖错误，而ec2 ec2依赖于elb所以在elb生成之后它可以将请求重定向到ec2但是我无法实现它。
你能帮我吗？在这里，我正在做一个带有2个子网公共和私有子网的VPC和使用私有子网的ec2，elb现在正在使用该vpc的公共子网，当请求到来时它将转到elb然后ec2请--------＆GT; ELB --------＆GT; EC2
喜欢以下方式
但在验证我收到错误时
Circular dependency between resources: [Instance, elb]
我是云形成的新手，所以任何帮助对我都有帮助
```
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "A VPC environment in two availability zones with an NAT instance.",
"Parameters": {
"envPrefix": {
"Description": "Environment name prefix.",
"Type": "String",
"Default": "Test"
},
"InstanceType": {
"Description": "Type of EC2 instance to launch",
"Type": "String",
"Default": "t1.micro"
},
"vpcCidr": {
"Description": "VPC CIDR block.",
"Type": "String",
"Default": "10.4.0.0/16",
"AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
"ConstraintDescription": "Must be a valid IP CIDR range of the form x.x.x.x/x."
},
"publicSubnet1Cidr": {
"Description": "Public subnet 1 CIDR block.",
"Type": "String",
"Default": "10.4.0.0/24",
"AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
"ConstraintDescription": "Must be a valid IP CIDR range of the form x.x.x.x/x and subnet of VPC."
},
"privateSubnet1Cidr": {
"Description": "Private subnet 1 CIDR block.",
"Type": "String",
"Default": "10.4.1.0/24",
"AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
"ConstraintDescription": "Must be a valid IP CIDR range of the form x.x.x.x/x and subnet of VPC."
},
"subnet1AZ": {
"Description": "Subnet 1 availability zone.",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"subnet2AZ": {
"Description": "Subnet 2 availability zone.",
"Type": "AWS::EC2::AvailabilityZone::Name"
},
"natInstanceType": {
"Description": "Amazon EC2 instance type for the NAT instance. This instance will be put on public subnet 1.",
"Type": "String",
"Default": "t2.small",
"AllowedValues": [
"t2.micro",
"t2.small",
"t2.medium",
"t2.large",
"m3.medium",
"m3.large",
"m3.xlarge",
"m3.2xlarge",
"m4.large",
"m4.xlarge",
"m4.2xlarge",
"m4.4xlarge",
"m4.10xlarge"
]
},
"natSshAccessCidr": {
"Description": "IP CIDR from where you could SSH into NAT instance",
"Type": "String",
"MinLength": "9",
"MaxLength": "18",
"Default": "0.0.0.0/0",
"AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
"ConstraintDescription": "must be a valid CIDR range of the form x.x.x.x/x."
},
"natKeyName": {
"Description": "Name of an existing EC2 KeyPair to enable SSH access to NAT instances.",
"Type": "AWS::EC2::KeyPair::KeyName",
"ConstraintDescription": "Must be the name of an existing EC2 KeyPair."
}
},
"Mappings": {
"AWSNATAMI": {
"eu-central-1": {
"AMI": "ami-46073a5b"
},
"sa-east-1": {
"AMI": "ami-fbfa41e6"
},
"ap-northeast-1": {
"AMI": "ami-03cf3903"
},
"eu-west-1": {
"AMI": "ami-6975eb1e"
},
"us-east-1": {
"AMI": "ami-303b1458"
},
"us-west-1": {
"AMI": "ami-7da94839"
},
"us-west-2": {
"AMI": "ami-69ae8259"
},
"ap-southeast-2": {
"AMI": "ami-e7ee9edd"
},
"ap-southeast-1": {
"AMI": "ami-b49dace6"
}
}
},
"Resources": {
"vpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": {
"Ref": "vpcCidr"
},
"InstanceTenancy": "default",
"EnableDnsSupport": "true",
"EnableDnsHostnames": "true",
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"VPC"
]
]
}
}
]
}
},
"publicSubnet1": {
"Type": "AWS::EC2::Subnet",
"DependsOn": [
"vpc",
"attachGateway"
],
"Properties": {
"CidrBlock": {
"Ref": "publicSubnet1Cidr"
},
"AvailabilityZone": {
"Ref": "subnet1AZ"
},
"VpcId": {
"Ref": "vpc"
},
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"Subnet-Public-1"
]
]
}
}
]
}
},
"privateSubnet1": {
"Type": "AWS::EC2::Subnet",
"DependsOn": [
"vpc",
"attachGateway"
],
"Properties": {
"CidrBlock": {
"Ref": "privateSubnet1Cidr"
},
"AvailabilityZone": {
"Ref": "subnet1AZ"
},
"VpcId": {
"Ref": "vpc"
},
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"Subnet-Private-1"
]
]
}
}
]
}
},
"inetGateway": {
"Type": "AWS::EC2::InternetGateway",
"DependsOn": [
"vpc"
],
"Properties": {
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"InternetGateway"
]
]
}
}
]
}
},
"attachGateway": {
"Type": "AWS::EC2::VPCGatewayAttachment",
"DependsOn": [
"vpc",
"inetGateway"
],
"Properties": {
"VpcId": {
"Ref": "vpc"
},
"InternetGatewayId": {
"Ref": "inetGateway"
}
}
},
"rtbPublic": {
"Type": "AWS::EC2::RouteTable",
"DependsOn": [
"vpc",
"attachGateway"
],
"Properties": {
"VpcId": {
"Ref": "vpc"
},
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"RTB-Public"
]
]
}
}
]
}
},
"routePublic": {
"Type": "AWS::EC2::Route",
"DependsOn": "attachGateway",
"Properties": {
"DestinationCidrBlock": "0.0.0.0/0",
"RouteTableId": {
"Ref": "rtbPublic"
},
"GatewayId": {
"Ref": "inetGateway"
}
}
},
"subnetRouteTableAssociationPublic1": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"DependsOn": [
"rtbPublic",
"publicSubnet1"
],
"Properties": {
"RouteTableId": {
"Ref": "rtbPublic"
},
"SubnetId": {
"Ref": "publicSubnet1"
}
}
},
"rtbPrivate": {
"Type": "AWS::EC2::RouteTable",
"DependsOn": [
"vpc"
],
"Properties": {
"VpcId": {
"Ref": "vpc"
},
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"RTB-Private"
]
]
}
}
]
}
},
"subnetRouteTableAssociationPrivate1": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"DependsOn": [
"rtbPublic",
"privateSubnet1"
],
"Properties": {
"RouteTableId": {
"Ref": "rtbPrivate"
},
"SubnetId": {
"Ref": "privateSubnet1"
}
}
},
"natEc2Instance": {
"Type": "AWS::EC2::Instance",
"DependsOn": [
"vpc",
"attachGateway",
"privateSubnet1",
"sgNAT"
],
"Properties": {
"DisableApiTermination": "false",
"InstanceInitiatedShutdownBehavior": "stop",
"InstanceType": {
"Ref": "natInstanceType"
},
"ImageId": {
"Fn::FindInMap": [
"AWSNATAMI",
{
"Ref": "AWS::Region"
},
"AMI"
]
},
"KeyName": {
"Ref": "natKeyName"
},
"Monitoring": "false",
"SourceDestCheck": "false",
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"NAT"
]
]
}
}
],
"NetworkInterfaces": [
{
"DeleteOnTermination": "true",
"Description": "Primary network interface",
"DeviceIndex": 0,
"SubnetId": {
"Ref": "publicSubnet1"
},
"GroupSet": [
{
"Ref": "sgNAT"
}
],
"AssociatePublicIpAddress": "true"
}
]
}
},
"sgNAT": {
"Type": "AWS::EC2::SecurityGroup",
"DependsOn": [
"vpc",
"attachGateway"
],
"Properties": {
"GroupDescription": "Security group for NAT instances",
"VpcId": {
"Ref": "vpc"
},
"SecurityGroupIngress": [
{
"IpProtocol": "tcp",
"FromPort": "0",
"ToPort": "1024",
"CidrIp": {
"Ref": "privateSubnet1Cidr"
}
},
{
"IpProtocol": "tcp",
"FromPort": "22",
"ToPort": "22",
"CidrIp": {
"Ref": "natSshAccessCidr"
}
}
],
"SecurityGroupEgress": [
{
"IpProtocol": "-1",
"CidrIp": "0.0.0.0/0"
}
],
"Tags": [
{
"Key": "Name",
"Value": {
"Fn::Join": [
"-",
[
{
"Ref": "envPrefix"
},
"SG-NAT"
]
]
}
}
]
}
},
"routePrivate": {
"Type": "AWS::EC2::Route",
"Properties": {
"DestinationCidrBlock": "0.0.0.0/0",
"RouteTableId": {
"Ref": "rtbPrivate"
},
"InstanceId": {
"Ref": "natEc2Instance"
}
}
},
"elb" : {
"Type": "AWS::ElasticLoadBalancing::LoadBalancer",
"Properties": {
"HealthCheck" : {
"Target" : "HTTP:80/",
"HealthyThreshold" : "3",
"UnhealthyThreshold" : "5",
"Interval" : "30",
"Timeout" : "5"
},
"LoadBalancerName" : "elbec2",
"Listeners" : [ {
"LoadBalancerPort" : "80",
"InstancePort" : "80",
"Protocol" : "HTTP"
} ],
"Instances" : [
{ "Ref" : "Instance" }
],
"Scheme" : "internal",
"SecurityGroups" : [{"Ref": "sgNAT" }],
"Subnets" : [ {"Ref": "publicSubnet1"}]
}
},
"Instance":{
"Type": "AWS::EC2::Instance",
"DependsOn": "elb",
"Metadata": {
"AWS::CloudFormation::Init": {
"configSets": {
"InstallAndRun": [
"Install"
]
},
"Install": {
"packages": {
"yum": {
"httpd": []
}
},
"files": {
"/var/www/html/index.html": {
"source": "https://s3.amazonaws.com/ec2back/index.html",
"mode": "000600",
"owner": "apache",
"group": "apache"
},
"/etc/cfn/cfn-hup.conf": {
"content": {
"Fn::Join": [
"",
[
"[main]\n",
"stack=",
{
"Ref": "AWS::StackId"
},
"\n",
"region=",
{
"Ref": "AWS::Region"
},
"\n"
]
]
},
"mode": "000400",
"owner": "root",
"group": "root"
},
"/etc/cfn/hooks.d/cfn-auto-reloader.conf": {
"content": {
"Fn::Join": [
"",
[
"[cfn-auto-reloader-hook]\n",
"triggers=post.update\n",
"path=Resources.Instance.Metadata.AWS::CloudFormation::Init\n",
"action=/opt/aws/bin/cfn-init -v ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource Instance ",
" --configsets InstallAndRun ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n",
"runas=root\n"
]
]
}
}
},
"services": {
"sysvinit": {
"httpd": {
"enabled": "true",
"ensureRunning": "true"
},
"cfn-hup": {
"enabled": "true",
"ensureRunning": "true",
"files": [
"/etc/cfn/cfn-hup.conf",
"/etc/cfn/hooks.d/cfn-auto-reloader.conf"
]
}
}
}
}
}
},
"Properties": {
"ImageId": {
"Fn::FindInMap": [
"AWSRegionArch2AMI",
{
"Ref": "AWS::Region"
},
{
"Fn::FindInMap": [
"AWSInstanceType2Arch",
{
"Ref": "InstanceType"
},
"Arch"
]
}
]
},
"InstanceType": {
"Ref": "InstanceType"
},
"NetworkInterfaces": [
{
"DeviceIndex": "0",
"AssociatePublicIpAddress": "true",
"DeleteOnTermination": "true",
"SubnetId": {
"Ref": "privateSubnet1"
},
"GroupSet": [
{
"Ref": "sgNAT"
}
]
}
],
"UserData": {
"Fn::Base64": {
"Fn::Join": [
"",
[
"#!/bin/bash -xe\n",
"yum update -y aws-cfn-bootstrap\n",
"# Install the files and packages from the metadata\n",
"/opt/aws/bin/cfn-init -v ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource Instance ",
" --configsets InstallAndRun ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n",
"# Signal the status from cfn-init\n",
"/opt/aws/bin/cfn-signal -e $? ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource Instance ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n"
]
]
}
}
}
}
}
}
````
答案 0 :(得分：0)
CloudFormation具有管理资源依赖关系的功能。请参阅DependsOn上的this CloudFormation文档，该文档描述了最佳做法并提供了更多详细信息。
在您的模板中，移除"DependsOn": "elb"行并尝试一下。