EC2MetadataUtils.getEC2InstanceRegion()，并且我们刚刚意识到我们不应该使用EC2MetadataUtils，因为它是一个内部API，可能会发生变化。
我做了一些谷歌搜索，但没有找到替代方案。有没有其他可用的解决方案可以获取EC2实例的区域？注意：这是一个内部API，可能会发生变化。SDK用户不应该依赖它。
class 的实现：https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-core/src/main/java/com/amazonaws/util/EC2MetadataUtils.java。在 Google 上搜寻后，我发现没有 Java 的替代方案，因此需要进行深入研究。以下是您可以采取的措施：
警告明确建议使用备用方案，但是缺乏现成的替代方案以及未来版本可能带来的好处是反对意见，因此您现在可以忽略此提示。
如果您在库中找到了此方法的调用，并能够以某种方式使用它，则可能是一种替代方案。例如，在克隆后：
git clone git@github.com:aws/aws-sdk-java.git
并使用以下方法搜索此方法的出现：
grep -rn 'yourpath' -e "getEC2InstanceRegion"
<path>/aws-sdk-java/aws-java-sdk-core/src/main/java/com/amazonaws/util/EC2MetadataUtils.java:286: public static String getEC2InstanceRegion() {
<path>/aws-sdk-java/aws-java-sdk-core/src/main/java/com/amazonaws/regions/InstanceMetadataRegionProvider.java:59: return EC2MetadataUtils.getEC2InstanceRegion();
<path>/aws-sdk-java/aws-java-sdk-core/src/main/java/com/amazonaws/regions/Regions.java:110: final String region = EC2MetadataUtils.getEC2InstanceRegion();
第一项匹配是该方法的定义。
第二项匹配如下：
/*
* Copyright 2011-2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.regions;
import com.amazonaws.AmazonClientException;
import com.amazonaws.SDKGlobalConfiguration;
import com.amazonaws.util.EC2MetadataUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Attempts to load region information from the EC2 Metadata service. If the application is not
* running on EC2 or {@link SDKGlobalConfiguration#isEc2MetadataDisabled()} returns true,
* this provider will return null.
*/
public class InstanceMetadataRegionProvider extends AwsRegionProvider {
private static final Log LOG = LogFactory.getLog(InstanceMetadataRegionProvider.class);
/**
* Cache region as it will not change during the lifetime of the JVM.
*/
private volatile String region;
/**
* @throws AmazonClientException if {@link SDKGlobalConfiguration#isEc2MetadataDisabled()} is true
*/
@Override
public String getRegion() {
if (SDKGlobalConfiguration.isEc2MetadataDisabled()) {
throw new AmazonClientException("AWS_EC2_METADATA_DISABLED is set to true, not loading region from EC2 Instance "
+ "Metadata service");
}
if (region == null) {
synchronized (this) {
if (region == null) {
this.region = tryDetectRegion();
}
}
}
return region;
}
private String tryDetectRegion() {
try {
return EC2MetadataUtils.getEC2InstanceRegion();
} catch (AmazonClientException sce) {
LOG.debug("Ignoring failure to retrieve the region: " + sce.getMessage());
return null;
}
}
}
看起来 InstanceMetadataRegionProvider 的 getRegion 方法是你正在寻找的替代方案。
第三个匹配项如下：
/*
* Copyright 2013-2022 Amazon Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://aws.amazon.com/apache2.0
*
* This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
* OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and
* limitations under the License.
*/
package com.amazonaws.regions;
import com.amazonaws.AmazonClientException;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.util.EC2MetadataUtils;
/**
* Enumeration of region names
*/
public enum Regions {
GovCloud("us-gov-west-1", "AWS GovCloud (US)"),
US_GOV_EAST_1("us-gov-east-1", "AWS GovCloud (US-East)"),
US_EAST_1("us-east-1", "US East (N. Virginia)"),
US_EAST_2("us-east-2", "US East (Ohio)"),
US_WEST_1("us-west-1", "US West (N. California)"),
US_WEST_2("us-west-2", "US West (Oregon)"),
EU_WEST_1("eu-west-1", "EU (Ireland)"),
EU_WEST_2("eu-west-2", "EU (London)"),
EU_WEST_3("eu-west-3", "EU (Paris)"),
EU_CENTRAL_1("eu-central-1", "EU (Frankfurt)"),
EU_NORTH_1("eu-north-1", "EU (Stockholm)"),
EU_SOUTH_1("eu-south-1", "EU (Milan)"),
AP_EAST_1("ap-east-1", "Asia Pacific (Hong Kong)"),
AP_SOUTH_1("ap-south-1", "Asia Pacific (Mumbai)"),
AP_SOUTHEAST_1("ap-southeast-1", "Asia Pacific (Singapore)"),
AP_SOUTHEAST_2("ap-southeast-2", "Asia Pacific (Sydney)"),
AP_SOUTHEAST_3("ap-southeast-3", "Asia Pacific (Jakarta)"),
AP_NORTHEAST_1("ap-northeast-1", "Asia Pacific (Tokyo)"),
AP_NORTHEAST_2("ap-northeast-2", "Asia Pacific (Seoul)"),
AP_NORTHEAST_3("ap-northeast-3", "Asia Pacific (Osaka)"),
SA_EAST_1("sa-east-1", "South America (Sao Paulo)"),
CN_NORTH_1("cn-north-1", "China (Beijing)"),
CN_NORTHWEST_1("cn-northwest-1", "China (Ningxia)"),
CA_CENTRAL_1("ca-central-1", "Canada (Central)"),
ME_SOUTH_1("me-south-1", "Middle East (Bahrain)"),
AF_SOUTH_1("af-south-1", "Africa (Cape Town)"),
US_ISO_EAST_1("us-iso-east-1", "US ISO East"),
US_ISOB_EAST_1("us-isob-east-1", "US ISOB East (Ohio)"),
US_ISO_WEST_1("us-iso-west-1", "US ISO West")
;
/**
* The default region that new customers in the US are encouraged to use
* when using AWS services for the first time.
*/
public static final Regions DEFAULT_REGION = US_WEST_2;
private final String name;
private final String description;
private Regions(String name, String description) {
this.name = name;
this.description = description;
}
/**
* The name of this region, used in the regions.xml file to identify it.
*/
public String getName() {
return name;
}
/**
* Descriptive readable name for this region.
*/
public String getDescription() {
return description;
}
/**
* Returns a region enum corresponding to the given region name.
*
* @param regionName
* The name of the region. Ex.: eu-west-1
* @return Region enum representing the given region name.
*/
public static Regions fromName(String regionName) {
for (Regions region : Regions.values()) {
if (region.getName().equals(regionName)) {
return region;
}
}
throw new IllegalArgumentException("Cannot create enum from " + regionName + " value!");
}
/**
* Returns a Region object representing the region the application is
* running in, when running in EC2. If this method is called from a non-EC2
* environment, it will return null.
*/
public static Region getCurrentRegion() {
try {
final String region = EC2MetadataUtils.getEC2InstanceRegion();
if (region != null)
return RegionUtils.getRegion(region);
} catch (AmazonClientException e) {
LogFactory.getLog(Regions.class).debug(
"Ignoring failure to retrieve the region: " + e.getMessage());
}
return null;
}
}
因此，在Regions中，getCurrentRegion看起来是另一个选择。如果您成功地使用其中之一达到了您的目的，那么重构将变得容易，并且相应地进行重构也是有意义的。
如果前两个选项对您不可行，则可以复制并重命名class，这样您就可以确保即使内部API更改，此方法也将保持不变。这不是一个非常优雅的方法，也不容易实现，因为class具有依赖项，因此您将遇到一些解决困难，但我们预先知道这是一种可能的解决方案。
这是一篇关于检索实例元数据的文章：https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
正如我们所看到的，除了实例的元数据信息之外，还可以找到区域：https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-categories.html
一个使用curl和jq的命令示例如下：
curl -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r .region
可以在这里找到：https://www.howtouselinux.com/post/find-ec2-instance-region-info-in-aws
EC2实例运行的区域信息是作为实例身份文档的一部分提供的。
正如AWS文档中所解释的并且也被@LajosArpad在他非常好的答案中指出，可以通过从EC2实例内部运行curl等方式获取此信息，具体URL如下：
curl http://169.254.169.254/latest/dynamic/instance-identity/document
返回的响应将类似于以下内容：
{
"devpayProductCodes" : null,
"marketplaceProductCodes" : [ "1abc2defghijklm3nopqrs4tu" ],
"availabilityZone" : "us-west-2b",
"privateIp" : "10.158.112.84",
"version" : "2017-09-30",
"instanceId" : "i-1234567890abcdef0",
"billingProducts" : null,
"instanceType" : "t2.micro",
"accountId" : "123456789012",
"imageId" : "ami-5fb8c835",
"pendingTime" : "2016-11-19T16:32:11Z",
"architecture" : "x86_64",
"kernelId" : null,
"ramdiskId" : null,
"region" : "us-west-2"
}
region字段。
EC2MetadataUtils基本上，当然，更详细地、以更结构化的方式，也可以阅读这些信息，以便为您提供实例正在运行的EC2区域。EC2MetadataUtils公开的功能的最小版本。region字段。URL url = new URL("http://169.254.169.254/latest/dynamic/instance-identity/document");
try (InputStream is = url.openStream();
JsonReader reader = Json.createReader(is)) {
JsonObject instanceDocument = reader.readObject();
String region = instanceDocument.getString("region");
// return it or use it as you need to
}
2.17.127。在这个版本中，https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-core/src/main/java/com/amazonaws/util/EC2MetadataUtils.java不可用。 - Suganthan Madhavan Pillai2.17.127版本的链接发给我，我会帮你查看。 - Lajos Arpad