如何从EC2实例中获得AWS EC2实例ID ?

如何从ec2实例中找到ec2实例的实例id ?

当前回答

一个更现代的解决方案。

在Amazon Linux中已经安装了ec2-metadata命令。

从终点站

ec2-metadata -help

会给你可用的选项吗

ec2-metadata -i

将返回

instance-id: yourid

2014-08-26 22:23:36

其他回答

我从http api为EC2元数据编写的c# .net类。我将根据需要构建它的功能。如果你喜欢，你可以用它。

using Amazon;
using System.Net;

namespace AT.AWS
{
    public static class HttpMetaDataAPI
    {
        public static bool TryGetPublicIP(out string publicIP)
        {
            return TryGetMetaData("public-ipv4", out publicIP);
        }
        public static bool TryGetPrivateIP(out string privateIP)
        {
            return TryGetMetaData("local-ipv4", out privateIP);
        }
        public static bool TryGetAvailabilityZone(out string availabilityZone)
        {
            return TryGetMetaData("placement/availability-zone", out availabilityZone);
        }

        /// <summary>
        /// Gets the url of a given AWS service, according to the name of the required service and the AWS Region that this machine is in
        /// </summary>
        /// <param name="serviceName">The service we are seeking (such as ec2, rds etc)</param>
        /// <remarks>Each AWS service has a different endpoint url for each region</remarks>
        /// <returns>True if the operation was succesful, otherwise false</returns>
        public static bool TryGetServiceEndpointUrl(string serviceName, out string serviceEndpointStringUrl)
        {
            // start by figuring out what region this instance is in.
            RegionEndpoint endpoint;
            if (TryGetRegionEndpoint(out endpoint))
            {
                // now that we know the region, we can get details about the requested service in that region
                var details = endpoint.GetEndpointForService(serviceName);
                serviceEndpointStringUrl = (details.HTTPS ? "https://" : "http://") + details.Hostname;
                return true;
            }
            // satisfy the compiler by assigning a value to serviceEndpointStringUrl
            serviceEndpointStringUrl = null;
            return false;
        }
        public static bool TryGetRegionEndpoint(out RegionEndpoint endpoint)
        {
            // we can get figure out the region end point from the availability zone
            // that this instance is in, so we start by getting the availability zone:
            string availabilityZone;
            if (TryGetAvailabilityZone(out availabilityZone))
            {
                // name of the availability zone is <nameOfRegionEndpoint>[a|b|c etc]
                // so just take the name of the availability zone and chop off the last letter
                var nameOfRegionEndpoint = availabilityZone.Substring(0, availabilityZone.Length - 1);
                endpoint = RegionEndpoint.GetBySystemName(nameOfRegionEndpoint);
                return true;
            }
            // satisfy the compiler by assigning a value to endpoint
            endpoint = RegionEndpoint.USWest2;
            return false;
        }
        /// <summary>
        /// Downloads instance metadata
        /// </summary>
        /// <returns>True if the operation was successful, false otherwise</returns>
        /// <remarks>The operation will be unsuccessful if the machine running this code is not an AWS EC2 machine.</remarks>
        static bool TryGetMetaData(string name, out string result)
        {
            result = null;
            try { result = new WebClient().DownloadString("http://169.254.169.254/latest/meta-data/" + name); return true; }
            catch { return false; }
        }

/************************************************************
 * MetaData keys.
 *   Use these keys to write more functions as you need them
 * **********************************************************
ami-id
ami-launch-index
ami-manifest-path
block-device-mapping/
hostname
instance-action
instance-id
instance-type
local-hostname
local-ipv4
mac
metrics/
network/
placement/
profile
public-hostname
public-ipv4
public-keys/
reservation-id
security-groups
*************************************************************/
    }
}

2013-12-04 03:07:08

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

2014-09-03 19:13:24

一个更现代的解决方案。

在Amazon Linux中已经安装了ec2-metadata命令。

从终点站