如果您还需要查询实例ID以外的其他信息，请使用/dynamic/instance-identity/document URL。

wget -q - o - http://169.254.169.254/latest/dynamic/instance-identity/document

这将为您提供这样的JSON数据——只需要一个请求。

{
    "devpayProductCodes" : null,
    "privateIp" : "10.1.2.3",
    "region" : "us-east-1",
    "kernelId" : "aki-12345678",
    "ramdiskId" : null,
    "availabilityZone" : "us-east-1a",
    "accountId" : "123456789abc",
    "version" : "2010-08-31",
    "instanceId" : "i-12345678",
    "billingProducts" : null,
    "architecture" : "x86_64",
    "imageId" : "ami-12345678",
    "pendingTime" : "2014-01-23T45:01:23Z",
    "instanceType" : "m1.small"
}

如果你想在python中获取所有实例id列表，下面是代码:

import boto3

ec2=boto3.client('ec2')
instance_information = ec2.describe_instances()

for reservation in instance_information['Reservations']:
   for instance in reservation['Instances']:
      print(instance['InstanceId'])

对于。net代码来说非常简单: var instanceId = Amazon.Util.EC2InstanceMetadata.InstanceId

对于c++(使用cURL):

    #include <curl/curl.h>

    //// cURL to string
    size_t curl_to_str(void *contents, size_t size, size_t nmemb, void *userp) {
        ((std::string*)userp)->append((char*)contents, size * nmemb);
        return size * nmemb;
    };

    //// Read Instance-id 
    curl_global_init(CURL_GLOBAL_ALL); // Initialize cURL
    CURL *curl; // cURL handler
    CURLcode res_code; // Result
    string response;
    curl = curl_easy_init(); // Initialize handler
    curl_easy_setopt(curl, CURLOPT_URL, "http://169.254.169.254/latest/meta-data/instance-id");
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_to_str);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
    res_code = curl_easy_perform(curl); // Perform cURL
    if (res_code != CURLE_OK) { }; // Error
    curl_easy_cleanup(curl); // Cleanup handler
    curl_global_cleanup(); // Cleanup cURL

获取实例元数据使用

wget -q -O - http://169.254.169.254/latest/meta-data/instance-id

请参阅有关该主题的EC2文档。

Run:

wget -q -O - http://169.254.169.254/latest/meta-data/instance-id

如果您需要从脚本中编程访问实例ID，

die() { status=$1; shift; echo "FATAL: $*"; exit $status; }
EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"

下面是一个更高级的使用示例(检索实例ID以及可用性区域和区域等):

EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'
EC2_AVAIL_ZONE="`wget -q -O - http://169.254.169.254/latest/meta-data/placement/availability-zone || die \"wget availability-zone has failed: $?\"`"
test -n "$EC2_AVAIL_ZONE" || die 'cannot obtain availability-zone'
EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"

您也可以使用curl而不是wget，这取决于您的平台上安装了什么。