[英]How to get an Instance reference for a newly created EC2 instance in aws java sdk?
假設我有幾個正在運行的EC2實例。 現在,我使用以下Java代碼啟動一個新實例:
RunInstancesRequest runInstancesRequest = new RunInstancesRequest()
.withInstanceType("m1.small")
.withImageId("some-ami")
.withMinCount(1)
.withMaxCount(1)
.withKeyName("some-key")
;
RunInstancesResult runInstancesResule = ec2.runInstances(runInstancesRequest);
我知道我可以遍歷整個實例列表以查找pending
實例,但這似乎很愚蠢。 有沒有更簡單的方法來獲取對該新創建的EC2實例的Instance
引用?
由於RunInstancesRequest
可以啟動多個實例,因此它將成功啟動的實例存儲在List
。 即使僅啟動一個實例,您仍然必須從列表中讀取它,可以使用runInstancesResule
變量進行訪問。 要獲得列表中的第一個實例,只需使用以下命令:
Instance myInstance = runInstancesResule.getReservation().getInstances().get(0);
然后,您可以從這里使用各種與實例相關的命令來獲取有關實例的信息(更多信息,請參見此處 )。 例如:
String myInstanceID = myInstance.getInstanceId();
編輯:
通過使用DescribeInstancesRequest
類,可以使用相同的概念來檢索您的所有實例,如下所示:
DescribeInstancesRequest describeInstanceRequest = new DescribeInstancesRequest();
DescribeInstancesResult describeInstanceResult = ec2.describeInstances(describeInstanceRequest);
List<Instance> myInstances = describeInstanceResult.getReservation().getInstances();
注意:這還將包括已停止但尚未終止的實例,因此您將需要檢查實例狀態以確定該實例是否正在實際運行。
我創建了兩個方法,它們將啟動一個或多個EC2實例,第二個方法將根據實例ID檢索實例:
要請求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();
}
要檢索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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