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
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
*************************************************************/
}
}
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
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
对于所有ec2机器,实例id可以在以下文件中找到:
/var/lib/cloud/data/instance-id
实例id也可以通过如下命令获取:
ec2metadata --instance-id
请参阅这篇文章-注意URL中给出的IP地址是常量(这一开始让我感到困惑),但返回的数据是特定于您的实例的。
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