麻烦部署VPC子网与CDK和蟒蛇

Question 1

我试图创建指子网的一个项目，但我跑进一个问题，CDK似乎使两个子网，与同CIDR框当合成为一个CloudFormation模板，虽然我只能使用一个CIDR块一旦每个子网宣言》。这会导致部署到失败，因为CIDR块互相冲突时创造的子网。这里是代码定义栈：

from aws_cdk import core as cdk
from aws_cdk import aws_ec2 as ec2

class CdkWorkshop3Stack(cdk.Stack):

    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        # The code that defines your stack goes here

        # instantiate VPC with dns support and hostname enabled and cidr block at 10.0.0.0/24
        vpc = ec2.Vpc(self, "vpc-cf",
                      cidr="10.0.0.0/24",
                      enable_dns_support=True,
                      enable_dns_hostnames=True
                      )

        # instantiate internet gateway and attach VPC with internet gateway
        igw = ec2.CfnInternetGateway(self, "igw")
        igw_attach = ec2.CfnVPCGatewayAttachment(
            self, "igw_attach", vpc_id=vpc.vpc_id, internet_gateway_id=igw.attr_internet_gateway_id)

        # instantiate elastic IP with VPC domin
        eip = ec2.CfnEIP(self, "eip", domain="VPC")

        # instantiate public and private subnets and use first availability zone
        pub_subnetA = ec2.Subnet(
            self, "public-subnetA", availability_zone=super().availability_zones[0], cidr_block="10.0.0.0/26", vpc_id=vpc.vpc_id, map_public_ip_on_launch=True)
        pub_subnetB = ec2.Subnet(
            self, "public-subnetB", availability_zone=super().availability_zones[0], cidr_block="10.0.0.64/26", vpc_id=vpc.vpc_id, map_public_ip_on_launch=True)
        pri_subnetA = ec2.Subnet(
            self, "private-subnetA", availability_zone=super().availability_zones[0], cidr_block="10.0.0.128/26", vpc_id=vpc.vpc_id, map_public_ip_on_launch=False)
        pri_subnetB = ec2.Subnet(
            self, "private-subnetB", availability_zone=super().availability_zones[0], cidr_block="10.0.0.192/26", vpc_id=vpc.vpc_id, map_public_ip_on_launch=False)

        # instantiate NAT gateway
        nat_gateway = ec2.CfnNatGateway(
            self, "nat_gateway", allocation_id=eip.attr_allocation_id, subnet_id=pub_subnetA.subnet_vpc_id)

        # instantiate routing tables
        pub_route_table = ec2.CfnRouteTable(
            self, "pub_route_table", vpc_id=vpc.vpc_id)
        pri_route_table = ec2.CfnRouteTable(
            self, "pri_route_table", vpc_id=vpc.vpc_id)

        # instantiate public and private routes
        pub_route = ec2.CfnRoute(self, "pub_route", route_table_id=pub_route_table.attr_route_table_id,
                                 destination_cidr_block="0.0.0.0/0", gateway_id=igw.attr_internet_gateway_id)
        pri_route = ec2.CfnRoute(self, "pri_route", route_table_id=pri_route_table.attr_route_table_id,
                                 destination_cidr_block="0.0.0.0/0", nat_gateway_id=nat_gateway.ref)

        # instantiate subnet route table associations
        pub_subnetA_route_table_association = ec2.CfnSubnetRouteTableAssociation(
            self, "pub_subnetA_route_table_association", route_table_id=pub_route_table.attr_route_table_id, subnet_id=pub_subnetA.subnet_vpc_id)
        pub_subnetB_route_table_association = ec2.CfnSubnetRouteTableAssociation(
            self, "pub_subnetB_route_table_association", route_table_id=pub_route_table.attr_route_table_id, subnet_id=pub_subnetB.subnet_vpc_id)
        pri_subnetA_route_table_association = ec2.CfnSubnetRouteTableAssociation(
            self, "pri_subnetA_route_table_association", route_table_id=pri_route_table.attr_route_table_id, subnet_id=pri_subnetA.subnet_vpc_id)
        pri_subnetB_route_table_association = ec2.CfnSubnetRouteTableAssociation(
            self, "pri_subnetB_route_table_association", route_table_id=pri_route_table.attr_route_table_id, subnet_id=pri_subnetB.subnet_vpc_id)

        security_group = ec2.SecurityGroup(self, "security_group", vpc=vpc)
        security_group.add_ingress_rule(
            ec2.Peer.ipv4("0.0.0.0/0"), ec2.Port.tcp(22))

        ec2_instance = ec2.Instance(self, "EC2", instance_type=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MICRO), machine_image=ec2.MachineImage.latest_amazon_linux(),
                                    key_name="RandomKeyName", security_group=security_group, vpc=vpc, vpc_subnets=pri_subnetA)

我不知道如何解决这个问题，因为显然应该仅仅使用那些CIDR块一次。但是它没有。

编辑：我现在包括一个链接到CloudFormation模板输出响应的评论。我们注意到，这一冲突的问题似乎只出现public_subnetA和private_subnetA. 我还是不明白为什么会发生这种情况。

编辑2:我试过了以下maafk的建议，并降低我的代码如下。我要保持2个公共和私人网配置，但现在我不能连接到我的EC2实例不管我怎么尝试。为什么东西，可以很容易实现的项目所以不必要的难做到的。CDK，让我们单独在蟒蛇?

from aws_cdk import core as cdk
from aws_cdk import aws_ec2 as ec2

class HelloCdkStack(cdk.Stack):

    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)
        vpc = ec2.Vpc(self, "vpc-cf",
                      cidr="10.0.0.0/24",
                      enable_dns_support=True,
                      enable_dns_hostnames=True,
                      nat_gateways=1,
                      max_azs=1,
                      subnet_configuration=[ec2.SubnetConfiguration(
                          name="public-subnetA",
                          cidr_mask=26,
                          subnet_type=ec2.SubnetType.PUBLIC
                      ), ec2.SubnetConfiguration(
                          name="public-subnetB",
                          cidr_mask=26,
                          subnet_type=ec2.SubnetType.PUBLIC
                      ), ec2.SubnetConfiguration(
                          name="private-subnetA",
                          cidr_mask=26,
                          subnet_type=ec2.SubnetType.PRIVATE
                      ), ec2.SubnetConfiguration(
                          name="private-subnetB",
                          cidr_mask=26,
                          subnet_type=ec2.SubnetType.PRIVATE)]
                      )

        ec2_instance = ec2.Instance(self, "EC2", instance_type=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MICRO), machine_image=ec2.MachineImage.latest_amazon_linux(
        ), key_name="KeyPairRandom", vpc=vpc, vpc_subnets=vpc.select_subnets(subnet_type=ec2.SubnetType.PUBLIC).subnets[0])

        ec2_instance.connections.allow_from_any_ipv4(
            ec2.Port.tcp(22), 'Allow inbound SSH from anywhere')

Question 2

你要添加更多的代码比是必要的。

创造virtual private cloud与CDK已经照顾大部分的这个给你

从档

优缺点所以请配置将创造公共和私人的子网

这里是一个更加"CDK母的办法"来编写这一点。

from aws_cdk import core as cdk
from aws_cdk import aws_ec2 as ec2

class CdkWorkshop3Stack(cdk.Stack):

    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        vpc = ec2.Vpc(self, "vpc-cf",
            cidr="10.0.0.0/24",
            # dns hostnames and support enabled by default
        )

        ec2_instance = ec2.Instance(self, "EC2", 
            instance_type=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MICRO), machine_image=ec2.MachineImage.latest_amazon_linux(),
            key_name="RandomKeyName", 
            vpc=vpc,
            # PRIVATE subnets are chosen by default
        )
        # Not a great security practice to open ssh to the world, but can do it this way
        ec2_instance.connections.allow_from_any_ipv4(ec2.Port.tcp(22), 'Allow inbound SSH from anywhere')

多少代码，使用"合理的违约"，与CDK

maafk · Answer 1 · 2021-11-20T12:31:11

你要添加更多的代码比是必要的。

创造virtual private cloud与CDK已经照顾大部分的这个给你

从档

优缺点所以请配置将创造公共和私人的子网

这里是一个更加"CDK母的办法"来编写这一点。

from aws_cdk import core as cdk
from aws_cdk import aws_ec2 as ec2

class CdkWorkshop3Stack(cdk.Stack):

    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        vpc = ec2.Vpc(self, "vpc-cf",
            cidr="10.0.0.0/24",
            # dns hostnames and support enabled by default
        )

        ec2_instance = ec2.Instance(self, "EC2", 
            instance_type=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MICRO), machine_image=ec2.MachineImage.latest_amazon_linux(),
            key_name="RandomKeyName", 
            vpc=vpc,
            # PRIVATE subnets are chosen by default
        )
        # Not a great security practice to open ssh to the world, but can do it this way
        ec2_instance.connections.allow_from_any_ipv4(ec2.Port.tcp(22), 'Allow inbound SSH from anywhere')

多少代码，使用"合理的违约"，与CDK

我怎么让它选择一个公共网。我认为私人的子网默认是离开我无法连接到我的实例通过SSH。
最好的选择SSH是使用SSM届会议管理(默认情况下安装在亚马逊Linux)，或者采用一个堡垒主在公共子网。如果你绝对必须创建你的实例在一个公共网，可以添加 vpc_subnets=vpc.SubnetSelection(subnet_type=ec2.SubnetType.PUBLIC) 来的 ec2.Instance 参数

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