Kubernetes 如何在使用客户端go创建节点时获取AWS metdata

我正在为我们的kubernetes群集编写自定义控制器，它将侦听节点事件并在节点上执行一些操作。我使用kubernetes客户端go库，能够在任何时候从群集连接或移除节点时捕获kubernetes事件。但是，是否有可能获得已创建的kubernetes节点的AWS实例详细信息，如实例id、标记等？提前谢谢

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PS：我已经使用kops在AWS中的kubernetes节点上安装了kubernetes群集，您将有一些内容作为节点标签的一部分和节点元数据的各种其他部分进行填充：

kubectl get nodes -o json | jq '.items[].metadata.labels'

{
  "beta.kubernetes.io/arch": "amd64",
  "beta.kubernetes.io/instance-type": "c5.large",
  "beta.kubernetes.io/os": "linux",
  "failure-domain.beta.kubernetes.io/region": "us-east-1",
  "failure-domain.beta.kubernetes.io/zone": "us-east-1b",
  "kubernetes.io/hostname": "<hostname>",
  "kubernetes.io/role": "master",
  "manufacturer": "amazon_ec2",
  "node-role.kubernetes.io/master": "",
  "operatingsystem": "centos",
  "tier": "production",
  "virtual": "kvm"
}

然而，这确实可能不是你想要的方式。如果您在AWS中的kops集群上运行此操作，则您的工作负载运行的节点已经具有对AWS API的访问权限，并且还具有查询节点数据所需的权限

考虑到这一点，请考虑使用。您可以很容易地查询EC2，下面是一个：

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在接收到节点创建事件时，它的objectobject的属性Nameobject.Name具有创建的aws实例的私有dns。使用实例的私有dns，我们可以使用aws sdk go查询实例id

hostName := object.Name
sess := session.Must(session.NewSessionWithOptions(session.Options{
    SharedConfigState: session.SharedConfigEnable,
}))

// Create new EC2 client
ec2Svc := ec2.New(sess)
var instanceId string
params := &ec2.DescribeInstancesInput{
Filters: []*ec2.Filter{
                {
                        Name:   aws.String("private-dns-name"),
                        Values: []*string{aws.String(hostName)},
                },
        },
}
// Call to get detailed information on each instance
result, err := ec2Svc.DescribeInstances(params)
if err != nil {
        fmt.Println("there was an error listing instances in", err.Error())
        log.Fatal(err.Error())
}
for idx, res := range result.Reservations {
        fmt.Println("  > Reservation Id", *res.ReservationId, " Num Instances: ", len(res.Instances))
        for _, inst := range result.Reservations[idx].Instances {
                // result[idx].SetDisableApiTermination(true);
                instanceId = *inst.InstanceId
                fmt.Println("    - Instance ID: ", *inst.InstanceId)
                break // Only one instance will match the private dns
        }
}

有了实例id，我们可以使用aws sdk go API在ec2实例上执行任何操作。

感谢您的回答：）这在一定程度上帮助了我。使用kubernetes元数据，我无法检索ec2元数据。。如果按aws sdk go，我将无法映射相应的节点。使用私有DNS（从节点的主机名）过滤实例时，会给出实例id，我可以通过该id执行其他操作

package main

import (
    "fmt"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/ec2"
)

func main() {
    // Load session from shared config
    sess := session.Must(session.NewSessionWithOptions(session.Options{
        SharedConfigState: session.SharedConfigEnable,
    }))

    // Create new EC2 client
    ec2Svc := ec2.New(sess)

    // Call to get detailed information on each instance
    result, err := ec2Svc.DescribeInstances(nil)
    if err != nil {
        fmt.Println("Error", err)
    } else {
        fmt.Println("Success", result)
    }
}

hostName := object.Name
sess := session.Must(session.NewSessionWithOptions(session.Options{
    SharedConfigState: session.SharedConfigEnable,
}))

// Create new EC2 client
ec2Svc := ec2.New(sess)
var instanceId string
params := &ec2.DescribeInstancesInput{
Filters: []*ec2.Filter{
                {
                        Name:   aws.String("private-dns-name"),
                        Values: []*string{aws.String(hostName)},
                },
        },
}
// Call to get detailed information on each instance
result, err := ec2Svc.DescribeInstances(params)
if err != nil {
        fmt.Println("there was an error listing instances in", err.Error())
        log.Fatal(err.Error())
}
for idx, res := range result.Reservations {
        fmt.Println("  > Reservation Id", *res.ReservationId, " Num Instances: ", len(res.Instances))
        for _, inst := range result.Reservations[idx].Instances {
                // result[idx].SetDisableApiTermination(true);
                instanceId = *inst.InstanceId
                fmt.Println("    - Instance ID: ", *inst.InstanceId)
                break // Only one instance will match the private dns
        }
}