如何检索启动Fargate任务的子网列表？

Question

我在Visual Studio 2017中使用带有C＃的AWS开发工具包，并使用原型工作在ECS中启动Fargate服务。作为设置的一部分，您需要实例化一个CreateServiceRequest对象，该对象需要NetworkConfiguration.AwsVpcConfiguration设置SecurityGroups和Subnets。

var request = new CreateServiceRequest();

request.ServiceName = "myService";
request.TaskDefinition = "myTask";   // family[:revision] of the task definition to use
request.ClientToken = Guid.NewGuid().ToString().Replace("-", "");  // max 32 characters!
request.Cluster = "default";
request.DesiredCount = 1;
request.LaunchType = LaunchType.FARGATE;

request.DeploymentConfiguration = new DeploymentConfiguration
{
    MaximumPercent = 100,
    MinimumHealthyPercent = 50
};

// configure the network and security groups for the task
List<string> securityGroups = new List<string>();
securityGroups.Add("sg-123456");

List<string> subnets = new List<string>();
subnets.Add("subnet-9b36aa97");

request.NetworkConfiguration = new NetworkConfiguration
{
    AwsvpcConfiguration = new AwsVpcConfiguration
    {
        AssignPublicIp = AssignPublicIp.ENABLED,
        SecurityGroups = securityGroups,
        Subnets = subnets
    }
};

当我通过AWS控制台手动配置服务时，它们会显示一个可供选择的子网列表。所以，我想知道如何以编程方式检索我们的VPC中可用的子网列表。

我正在搜索他们的SDK documentation以寻找可能的解决方案，我们非常感谢您对其文档或示例的任何指示！

Answer 1

看看EC2Client，你会发现许多与VPC相关的API与EC2服务相关联。具体请查看AmazonEC2Client.DescribeSubnets(DescribeSubnetsRequest)方法文档here：

请求

Amazon.EC2.Model.DescribeSubnetsRequest

响应

Amazon.EC2.Model.DescribeSubnetsResponse

响应包含一个Amazon.EC2.Model.Subnet列表，当您决定将哪个子网传递给您的Fargate请求时，您将从中检索字符串属性SubnetId。

示例用法（来自链接文档）：

var response = client.DescribeSubnets(new DescribeSubnetsRequest 
{
    Filters = new List<filter> {
        new Filter {
            Name = "vpc-id",
            Values = new List<string> {
                "vpc-a01106c2"
            }
        }
    }
});

List<subnet> subnets = response.Subnets;

进一步阅读

• AWS Documentation - EC2Client - 在此文档中搜索“DescribeSubnets”以查找此SDK方法的异步变体。