[PHP] 把玩 PHP AWS SDK - 列出 EC2 指定規格列表、 ELB 底下的機器列表 @ Ubuntu 14.04

之前用一些 tool-based 的工具做了一些事情，例如呼叫完指令再動態抽 JSON 資料：

• $ aws elb describe-load-balancers --load-balancer-name "XXX"
• $ aws ec2 describe-instances --instance-ids  "XXX"

來試試 AWS SDK 來做事吧，先挑 PHP ！

為了高移植性，我採用下載 aws.phar 的模式：

• 簡介
• http://aws.amazon.com/tw/sdk-for-php/
• 安裝
• http://docs.aws.amazon.com/aws-sdk-php/v3/guide/getting-started/installation.html
• http://docs.aws.amazon.com/aws-sdk-php/v3/download/aws.phar
• 文件
• http://docs.aws.amazon.com/aws-sdk-php/v3/api/class-Aws.Ec2.Ec2Client.html
• http://docs.aws.amazon.com/aws-sdk-php/v3/api/class-Aws.ElasticLoadBalancing.ElasticLoadBalancingClient.html
• 除錯
• 對 PHP 5.3 的來說，有機會碰到 phar 讀進來就 syntax error (yield)，這時就改去下載 2.8 版吧
• 錯誤訊息
• PHP Parse error:  syntax error, unexpected T_VARIABLE in phar
• https://github.com/aws/aws-sdk-php/releases
• https://github.com/aws/aws-sdk-php/releases/download/2.8.23/aws.phar

接著則是簡單的登入資料填寫一下：

<?php
require 'aws.phar';

$config = array(
'version' => 'latest',
'credentials' => array(
'key' => 'key',
'secret' => 'secret',
),
'region' => 'us-west-2',
);

列出 EC2 - m1.small instance：

<?php
$ec2Client = Aws\Ec2\Ec2Client::factory($config);

// http://docs.aws.amazon.com/aws-sdk-php/v3/api/class-Aws.Ec2.Ec2Client.html
$result = $ec2Client->DescribeInstances(array(
        'Filters' => array(
                 array('Name' => 'instance-type', 'Values' => array('m1.small')),
        )
));

print_r($result);

想要列出 EC2 - 指定 Load Balancer 下的機器：

<?php
$client = Aws\ElasticLoadBalancing\ElasticLoadBalancingClient::factory($config);
$result = $client->DescribeLoadBalancers( array(
        'LoadBalancerNames' => array('Load Balancer Name')
));
print_r($result['LoadBalancerDescriptions'][0]['Instances']);
print_r($result);

其中，雖然 $result 都是 Aws\Result Object ，且裡頭都是 [data:Aws\Result:private] => Array ，但可以透過 array access 的方式去存取囉。

接下來就可以試試連續動作，從 ELB 得知機器後，再得到機器的 public ip：

<?php

require 'aws.phar';

$ELB_NAME = 'XXXX';
$client = Aws\ElasticLoadBalancing\ElasticLoadBalancingClient::factory($config);
$result = $client->DescribeLoadBalancers( array('LoadBalancerNames' => array($ELB_NAME)));
if (isset($result['LoadBalancerDescriptions']) && is_array($result['LoadBalancerDescriptions']) && count($result['LoadBalancerDescriptions']) && isset($result['LoadBalancerDescriptions'][0]['Instances'])) {
$instances = $result['LoadBalancerDescriptions'][0]['Instances'];
//print_r($instances);
$ec2_id = array();
foreach($instances as $ec2)
if (isset($ec2['InstanceId']))
array_push($ec2_id, $ec2['InstanceId']);
if (count($ec2_id) > 0) {
$client = Aws\Ec2\Ec2Client::factory($setup);
$result = $client->DescribeInstances(array(
'Filters' => array(
array('Name' => 'instance-id', 'Values' => $ec2_id),
)
));
}
$public_ip = array();
if (isset($result['Reservations'])) {
foreach($result['Reservations'] as $target) {
//print_r($target['Instances'][0]['PublicIpAddress']);
array_push($public_ip, $target['Instances'][0]['PublicIpAddress']);
}
}
//print_r($result['Reservations']);
print_r($public_ip);
}