[英]How to get an Instance reference for a newly created EC2 instance in aws java sdk?
假设我有几个正在运行的EC2实例。 现在,我使用以下Java代码启动一个新实例:
RunInstancesRequest runInstancesRequest = new RunInstancesRequest()
.withInstanceType("m1.small")
.withImageId("some-ami")
.withMinCount(1)
.withMaxCount(1)
.withKeyName("some-key")
;
RunInstancesResult runInstancesResule = ec2.runInstances(runInstancesRequest);
我知道我可以遍历整个实例列表以查找pending
实例,但这似乎很愚蠢。 有没有更简单的方法来获取对该新创建的EC2实例的Instance
引用?
由于RunInstancesRequest
可以启动多个实例,因此它将成功启动的实例存储在List
。 即使仅启动一个实例,您仍然必须从列表中读取它,可以使用runInstancesResule
变量进行访问。 要获得列表中的第一个实例,只需使用以下命令:
Instance myInstance = runInstancesResule.getReservation().getInstances().get(0);
然后,您可以从这里使用各种与实例相关的命令来获取有关实例的信息(更多信息,请参见此处 )。 例如:
String myInstanceID = myInstance.getInstanceId();
编辑:
通过使用DescribeInstancesRequest
类,可以使用相同的概念来检索您的所有实例,如下所示:
DescribeInstancesRequest describeInstanceRequest = new DescribeInstancesRequest();
DescribeInstancesResult describeInstanceResult = ec2.describeInstances(describeInstanceRequest);
List<Instance> myInstances = describeInstanceResult.getReservation().getInstances();
注意:这还将包括已停止但尚未终止的实例,因此您将需要检查实例状态以确定该实例是否正在实际运行。
我创建了两个方法,它们将启动一个或多个EC2实例,第二个方法将根据实例ID检索实例:
要请求EC2:
public List<Instance> requestEC2(AmazonEC2 amazonEC2, String instanceName, String imageId, String instanceType, String securityGroupName, int count) {
RunInstancesRequest runInstancesRequest = new RunInstancesRequest();
TagSpecification tagSpecification = new TagSpecification();
tagSpecification.withResourceType(ResourceType.Instance).withTags(new Tag().withKey("Name").withValue(instanceName));
runInstancesRequest.withImageId(imageId).withInstanceType(instanceType).withMinCount(1).withMaxCount(count).withSecurityGroups(securityGroupName).withTagSpecifications(tagSpecification);
RunInstancesResult runInstancesResult = amazonEC2.runInstances(runInstancesRequest);
return runInstancesResult.getReservation().getInstances();
}
要检索EC2:
public List<Instance> getEC2InstanceDetails(AmazonEC2 amazonEC2, List<String> instanceIds){
List<Instance> instanceList = new ArrayList<>();
DescribeInstancesRequest describeInstancesRequest = new DescribeInstancesRequest();
describeInstancesRequest.setInstanceIds(instanceIds);
DescribeInstancesResult describeInstancesResult = amazonEC2.describeInstances(describeInstancesRequest);
for(Reservation reservation : describeInstancesResult.getReservations()){
for(Instance instance : reservation.getInstances()) {
instanceList.add(instance);
}
}
return instanceList;
}
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