My problem is that a Lambda function that I run behind NAT inside a VPC with an IGW doesn't have access to anything in the Internet.
我要做的是创建一个具有以下功能的VPC:
-
互联网网关;
-
2个私有子网(
PrivateA
和PrivateB
)分别在可用区A
和B
中;
可用区 -
1公共子网(
PublicA
)A
-
PublicA
子网中的NAT网关 -
PrivateA
和PrivateB
有一个路由表,用于将0.0.0.0/0
路由到NAT网关 . -
PublicA
有一个路由表,用于将0.0.0.0/0
路由到Internet网关 . -
专用子网以及公有子网具有允许所有Ingress和Egress流量的访问控制列表 .
那部分是有效的 .
接下来,我想在VPC中创建一个Lambda函数 . 我将它放入 PrivateA
和 PrivateB
并为其分配一个允许所有Egress和Ingress流量的安全组 .
下面是一个重现问题的独立示例(整个模板) . 我已经阅读了互联网上所有可能的文档和文章,所以如果有人能指出我正确的方向,我将非常感激 .
{
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"Vpc": {
"Type": "AWS::EC2::VPC",
"Properties": {
"CidrBlock": "10.0.0.0/16",
"EnableDnsSupport": true,
"EnableDnsHostnames": true,
"InstanceTenancy": "default"
}
},
"InternetGateway": {
"Type": "AWS::EC2::InternetGateway"
},
"VpcGatewayAttachment": {
"Type": "AWS::EC2::VPCGatewayAttachment",
"Properties": {
"VpcId": { "Ref": "Vpc" },
"InternetGatewayId": { "Ref": "InternetGateway" }
}
},
"ElasticIP":{
"Type": "AWS::EC2::EIP",
"Properties": {
"Domain": "vpc"
}
},
"NatGateway": {
"Type": "AWS::EC2::NatGateway",
"DependsOn": [ "VpcGatewayAttachment" ],
"Properties": {
"AllocationId": { "Fn::GetAtt": [ "ElasticIP", "AllocationId" ] },
"SubnetId": { "Ref": "SubnetAPublic" }
}
},
"SubnetAPublic": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": { "Fn::Select" : [ "0", { "Fn::GetAZs" : "" } ] },
"CidrBlock": "10.0.0.0/19",
"MapPublicIpOnLaunch": true,
"VpcId": { "Ref": "Vpc" }
}
},
"SubnetAPrivate": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": { "Fn::Select" : [ "0", { "Fn::GetAZs" : "" } ] },
"CidrBlock": "10.0.64.0/19",
"VpcId": { "Ref": "Vpc" }
}
},
"SubnetBPrivate": {
"Type": "AWS::EC2::Subnet",
"Properties": {
"AvailabilityZone": { "Fn::Select" : [ "1", { "Fn::GetAZs" : "" } ] },
"CidrBlock": "10.0.96.0/19",
"VpcId": { "Ref": "Vpc" }
}
},
"RouteTablePublic": {
"Type": "AWS::EC2::RouteTable",
"Properties": {
"VpcId": { "Ref": "Vpc" }
}
},
"RouteTablePrivate": {
"Type": "AWS::EC2::RouteTable",
"Properties": {
"VpcId": { "Ref": "Vpc" }
}
},
"RouteTableAssociationAPublic": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": { "Ref": "SubnetAPublic" },
"RouteTableId": { "Ref": "RouteTablePublic" }
}
},
"RouteTableAssociationAPrivate": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": { "Ref": "SubnetAPrivate" },
"RouteTableId": { "Ref": "RouteTablePrivate" }
}
},
"RouteTableAssociationBPrivate": {
"Type": "AWS::EC2::SubnetRouteTableAssociation",
"Properties": {
"SubnetId": { "Ref": "SubnetBPrivate" },
"RouteTableId": { "Ref": "RouteTablePrivate" }
}
},
"RouteTablePrivateInternetRoute": {
"Type": "AWS::EC2::Route",
"DependsOn": [ "VpcGatewayAttachment" ],
"Properties": {
"RouteTableId": { "Ref": "RouteTablePrivate" },
"DestinationCidrBlock": "0.0.0.0/0",
"NatGatewayId": { "Ref": "NatGateway" }
}
},
"RouteTablePublicInternetRoute": {
"Type": "AWS::EC2::Route",
"DependsOn": [ "VpcGatewayAttachment" ],
"Properties": {
"RouteTableId": { "Ref": "RouteTablePublic" },
"DestinationCidrBlock": "0.0.0.0/0",
"GatewayId": { "Ref": "InternetGateway" }
}
},
"NetworkAclPublic": {
"Type": "AWS::EC2::NetworkAcl",
"Properties": {
"VpcId": { "Ref": "Vpc" }
}
},
"NetworkAclPrivate": {
"Type": "AWS::EC2::NetworkAcl",
"Properties": {
"VpcId": { "Ref": "Vpc" }
}
},
"SubnetNetworkAclAssociationAPublic": {
"Type": "AWS::EC2::SubnetNetworkAclAssociation",
"Properties":{
"SubnetId": { "Ref": "SubnetAPublic" },
"NetworkAclId": { "Ref": "NetworkAclPublic" }
}
},
"SubnetNetworkAclAssociationAPrivate": {
"Type": "AWS::EC2::SubnetNetworkAclAssociation",
"Properties":{
"SubnetId": { "Ref": "SubnetAPrivate" },
"NetworkAclId": { "Ref": "NetworkAclPrivate" }
}
},
"SubnetNetworkAclAssociationBPrivate": {
"Type": "AWS::EC2::SubnetNetworkAclAssociation",
"Properties": {
"SubnetId": { "Ref": "SubnetBPrivate" },
"NetworkAclId": { "Ref": "NetworkAclPrivate" }
}
},
"NetworkAclEntryInPublicAllowAll": {
"Type": "AWS::EC2::NetworkAclEntry",
"Properties": {
"NetworkAclId": { "Ref": "NetworkAclPublic" },
"RuleNumber": 99,
"Protocol": -1,
"RuleAction": "allow",
"Egress": false,
"CidrBlock": "0.0.0.0/0"
}
},
"NetworkAclEntryOutPublicAllowAll": {
"Type": "AWS::EC2::NetworkAclEntry",
"Properties": {
"NetworkAclId": { "Ref": "NetworkAclPublic" },
"RuleNumber": 99,
"Protocol": -1,
"RuleAction": "allow",
"Egress": true,
"CidrBlock": "0.0.0.0/0"
}
},
"NetworkAclEntryInPrivateAllowVpc": {
"Type": "AWS::EC2::NetworkAclEntry",
"Properties": {
"NetworkAclId": { "Ref": "NetworkAclPrivate" },
"RuleNumber": 99,
"Protocol": -1,
"RuleAction": "allow",
"Egress": false,
"CidrBlock": "0.0.0.0/16"
}
},
"NetworkAclEntryOutPrivateAllowVpc": {
"Type": "AWS::EC2::NetworkAclEntry",
"Properties": {
"NetworkAclId": { "Ref": "NetworkAclPrivate" },
"RuleNumber": 99,
"Protocol": -1,
"RuleAction": "allow",
"Egress": true,
"CidrBlock": "0.0.0.0/0"
}
},
"LambdasSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "Lambdas security group",
"SecurityGroupEgress": [
{ "CidrIp": "0.0.0.0/0", "IpProtocol": "-1" }
],
"SecurityGroupIngress": [
{ "CidrIp": "0.0.0.0/0", "IpProtocol": "-1" }
],
"VpcId": { "Ref": "Vpc" }
}
},
"LambdaFunctionExecutionRole": {
"Type": "AWS::IAM::Role",
"Properties": {
"AssumeRolePolicyDocument": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": { "Service": "lambda.amazonaws.com" },
"Action": "sts:AssumeRole"
}
]
},
"ManagedPolicyArns": [
"arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole",
"arn:aws:iam::aws:policy/service-role/AWSLambdaVPCAccessExecutionRole"
]
}
},
"LambdaFunction": {
"Type": "AWS::Lambda::Function",
"Properties": {
"Handler": "index.lambda_handler",
"Runtime": "python2.7",
"Role": {
"Fn::GetAtt": ["LambdaFunctionExecutionRole", "Arn"]
},
"Code": {
"ZipFile": {
"Fn::Join": ["\n", [
"import urllib2",
"def lambda_handler(event, context):",
"\tresponse = urllib2.urlopen('http://python.org/')",
"\treturn response.read()"
]]
}
},
"VpcConfig": {
"SecurityGroupIds": [
{ "Fn::GetAtt": [ "LambdasSecurityGroup", "GroupId"] }
],
"SubnetIds": [
{ "Ref": "SubnetAPrivate" },
{ "Ref": "SubnetBPrivate" }
]
}
}
}
}
}
1 回答
连接失败的原因在于“NetworkAclEntryInPrivateAllowVpc”和“NetworkAclEntryOutPrivateAllowVpc”的ACL配置 .
如果您将该CIDR块从“0.0.0.0/16”打开到“0.0.0.0/0”,Lambda可以访问互联网 .
我对NAT知之甚少,但似乎NAT流量被该ACL规则阻止 .