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我是比較新的JavaScript，所以我道歉，如果這是一個明顯的問題。這麼說，我還沒有發現審查其他職位後的答案，所以這裏有雲：提取數據從嵌套對象 - AWS ec2.describeInstances在node.js中
我想提取有關使用describeInstances我的EC2實例從AWS的具體信息。具體來說，我希望能夠提供InstanceIds列表並從結果對象中提取帶有鍵的標籤的值：「Name」。這裏是基本代碼：
// Load the SDK for JavaScript
var AWS = require('aws-sdk');
// Load credentials and set region from JSON file
AWS.config.loadFromPath('./.aws/config.json');
// Create EC2 service object
var ec2 = new AWS.EC2({apiVersion: '2016-11-15'});
var params = {
DryRun: false,
InstanceIds: ['i-0be50217a4028a044', 'i-08b83c1c428e9a1d2']
};
ec2.describeInstances(params, function(err, data) {
if (err) {
console.log("Error", err.stack);
} else {
console.log("Success", JSON.stringify(data));
}
});在運行此代碼，就返回一個大的，多毛的和嵌套對象。這樣做的JSON.stringify（）版本如下所示：
{
\t "Reservations": [{
\t \t "ReservationId": "r-04e32387e546387ba",
\t \t "OwnerId": "543800113692",
\t \t "Groups": [],
\t \t "Instances": [{
\t \t \t "InstanceId": "i-08b83c1c428e9a1d2",
\t \t \t "ImageId": "ami-8aa998ea",
\t \t \t "State": {
\t \t \t \t "Code": 16,
\t \t \t \t "Name": "running"
\t \t \t },
\t \t \t "PrivateDnsName": "ip-10-77-113-210.us-west-2.compute.internal",
\t \t \t "PublicDnsName": "ec2-35-165-200-222.us-west-2.compute.amazonaws.com",
\t \t \t "StateTransitionReason": "",
\t \t \t "KeyName": "Security1",
\t \t \t "AmiLaunchIndex": 0,
\t \t \t "ProductCodes": [],
\t \t \t "InstanceType": "t2.micro",
\t \t \t "LaunchTime": "2017-02-14T14:59:11.000Z",
\t \t \t "Placement": {
\t \t \t \t "AvailabilityZone": "us-west-2b",
\t \t \t \t "GroupName": "",
\t \t \t \t "Tenancy": "default"
\t \t \t },
\t \t \t "Monitoring": {
\t \t \t \t "State": "disabled"
\t \t \t },
\t \t \t "SubnetId": "subnet-228da755",
\t \t \t "VpcId": "vpc-af0f0dca",
\t \t \t "PrivateIpAddress": "10.77.113.210",
\t \t \t "PublicIpAddress": "35.165.200.222",
\t \t \t "Architecture": "x86_64",
\t \t \t "RootDeviceType": "ebs",
\t \t \t "RootDeviceName": "/dev/sda1",
\t \t \t "BlockDeviceMappings": [{
\t \t \t \t "DeviceName": "/dev/sda1",
\t \t \t \t "Ebs": {
\t \t \t \t \t "VolumeId": "vol-00e55d6bf114bfcaa0",
\t \t \t \t \t "Status": "attached",
\t \t \t \t \t "AttachTime": "2017-02-09T15:37:34.000Z",
\t \t \t \t \t "DeleteOnTermination": true
\t \t \t \t }
\t \t \t }],
\t \t \t "VirtualizationType": "hvm",
\t \t \t "ClientToken": "vOiiS1486654656072",
\t \t \t "Tags": [{
\t \t \t \t "Key": "Name",
\t \t \t \t "Value": "Fenris"
\t \t \t }],
\t \t \t "SecurityGroups": [{
\t \t \t \t "GroupName": "launch-wizard-2",
\t \t \t \t "GroupId": "sg-2312072c"
\t \t \t }],
\t \t \t "SourceDestCheck": true,
\t \t \t "Hypervisor": "xen",
\t \t \t "EbsOptimized": false
\t \t }]
\t }, {
\t \t "ReservationId": "r-0bbcb12e5c1162c23",
\t \t "OwnerId": "543800113692",
\t \t "Groups": [],
\t \t "Instances": [{
\t \t \t "InstanceId": "i-0be50217a40028a044",
\t \t \t "ImageId": "ami-8ba011ea",
\t \t \t "State": {
\t \t \t \t "Code": 80,
\t \t \t \t "Name": "stopped"
\t \t \t },
\t \t \t "PrivateDnsName": "ip-10-77-118-17.us-west-2.compute.internal",
\t \t \t "PublicDnsName": "",
\t \t \t "StateTransitionReason": "User initiated (2016-12-05 16:49:45 GMT)",
\t \t \t "KeyName": "Security3",
\t \t \t "AmiLaunchIndex": 0,
\t \t \t "ProductCodes": [],
\t \t \t "InstanceType": "t2.medium",
\t \t \t "LaunchTime": "2016-12-02T15:50:08.000Z",
\t \t \t "Placement": {
\t \t \t \t "AvailabilityZone": "us-west-2b",
\t \t \t \t "GroupName": "",
\t \t \t \t "Tenancy": "default"
\t \t \t },
\t \t \t "Monitoring": {
\t \t \t \t "State": "disabled"
\t \t \t },
\t \t \t "SubnetId": "subnet-228da700",
\t \t \t "VpcId": "vpc-af0f1ccb",
\t \t \t "PrivateIpAddress": "10.77.118.17",
\t \t \t "StateReason": {
\t \t \t \t "Code": "Client.UserInitiatedShutdown",
\t \t \t \t "Message": "Client.UserInitiatedShutdown: User initiated shutdown"
\t \t \t },
\t \t \t "Architecture": "x86_64",
\t \t \t "RootDeviceType": "ebs",
\t \t \t "RootDeviceName": "/dev/sda1",
\t \t \t "BlockDeviceMappings": [{
\t \t \t \t "DeviceName": "/dev/sda1",
\t \t \t \t "Ebs": {
\t \t \t \t \t "VolumeId": "vol-1c211ac8",
\t \t \t \t \t "Status": "attached",
\t \t \t \t \t "AttachTime": "2016-11-22T01:54:52.000Z",
\t \t \t \t \t "DeleteOnTermination": true
\t \t \t \t }
\t \t \t }],
\t \t \t "VirtualizationType": "hvm",
\t \t \t "ClientToken": "RQbhg1479762230132",
\t \t \t "Tags": [{
\t \t \t \t "Key": "Name",
\t \t \t \t "Value": "Heimdall"
\t \t \t }, {
\t \t \t \t "Key": "Type",
\t \t \t \t "Value": "Product Dev"
\t \t \t }],
\t \t \t "SecurityGroups": [{
\t \t \t \t "GroupName": "LinuxAPIdev",
\t \t \t \t "GroupId": "sg-5ea11777"
\t \t \t }],
\t \t \t "SourceDestCheck": true,
\t \t \t "Hypervisor": "xen",
\t \t \t "EbsOptimized": false
\t \t }]
\t }]
}這是方式更多信息比我更需要或想要的。我想找到一種方法來僅從Reservations.Instances.Tags.Name鍵中獲取Reservations.Instances.Tags.Value的值。
我認爲只要這樣寫就行。但奇怪的是，我似乎無法訪問Reservations.Instances對象都：
// Load the SDK for JavaScript
var AWS = require('aws-sdk');
// Load credentials and set region from JSON file
AWS.config.loadFromPath('./.aws/config.json');
// Create EC2 service object
var ec2 = new AWS.EC2({apiVersion: '2016-11-15'});
var params = {
DryRun: false,
InstanceIds: ['i-0be5987a41191a044', 'i-08b83c3fc28e9a1d2']
};
// call EC2 to retrieve policy for selected bucket
ec2.describeInstances(params, function(err, data) {
if (err) {
console.log("Error", err.stack);
} else {
console.log("Success", JSON.stringify(data.Reservations.Instances));
}
});這導致：
Success undefined上午什麼我做錯了？如何訪問實例中較低級別的數據？很顯然，它顯示在JSON.stringify（）中，但顯然我沒有正確的協議來提取它。
在此先感謝您的幫助。
（PS由於AWS憑證，你將不能夠不小的改動我的代碼運行。你需要引用您自己的證書，並從自己的EC2實例InstanceIds。）
Whaddaya知道。完美的作品。謝謝。 – rucker
歡迎你 –