Introduction au Zend Framework

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 Guide de référence Zend Framework


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  • Translation 61.2% Update 2010-11-28 - Revision 23149 - Version ZF 1.11.x

    63.5. Zend_Service_Amazon_Ec2: Instances

    63.5.1. Instance Types

    Amazon EC2 instances are grouped into two families: standard and High-CPU. Standard instances have memory to CPU ratios suitable for most general purpose applications; High-CPU instances have proportionally more CPU resources than memory (RAM) and are well suited for compute-intensive applications. When selecting instance types, you might want to use less powerful instance types for your web server instances and more powerful instance types for your database instances. Additionally, you might want to run CPU instance types for CPU-intensive data processing tasks.

    One of the advantages of EC2 is that you pay by the instance hour, which makes it convenient and inexpensive to test the performance of your application on different instance families and types. One good way to determine the most appropriate instance family and instance type is to launch test instances and benchmark your application.

    [Note] Instance Types

    The instance types are defined as constants in the code. Column eight in the table is the defined constant name

    Tableau 63.10. Available Instance Types

    Type CPU Memory Storage Platform I/O Name Constant Name
    Small

    1 EC2 Compute Unit (1 virtual core with 1 EC2 Compute Unit)

    1.7 GB

    160 GB instance storage (150 GB plus 10 GB root partition)

    32-bit

    Moderate

    m1.small

    Zend_Service_Amazon_Ec2_Instance::SMALL
    Large

    4 EC2 Compute Units (2 virtual cores with 2 EC2 Compute Units each)

    7.5 GB

    850 GB instance storage (2 x 420 GB plus 10 GB root partition)

    64-bit

    High

    m1.large

    Zend_Service_Amazon_Ec2_Instance::LARGE
    Extra Large

    8 EC2 Compute Units (4 virtual cores with 2 EC2 Compute Units each)

    15 GB

    1,690 GB instance storage (4 x 420 GB plus 10 GB root partition)

    64-bit

    High

    m1.xlarge

    Zend_Service_Amazon_Ec2_Instance::XLARGE
    High-CPU Medium

    5 EC2 Compute Units (2 virtual cores with 2.5 EC2 Compute Units each)

    1.7 GB

    350 GB instance storage (340 GB plus 10 GB root partition)

    32-bit

    Moderate

    c1.medium

    Zend_Service_Amazon_Ec2_Instance::HCPU_MEDIUM
    High-CPU Extra Large

    20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)

    7 GB

    1,690 GB instance storage (4 x 420 GB plus 10 GB root partition)

    64-bit

    High

    c1.xlarge

    Zend_Service_Amazon_Ec2_Instance::HCPU_XLARGE

    63.5.2. Running Amazon EC2 Instances

    This section describes the operation methods for maintaining Amazon EC2 Instances.

    Exemple 63.13. Starting New Ec2 Instances

    run will launch a specified number of EC2 Instances. run takes an array of parameters to start, below is a table containing the valid values.

    Tableau 63.11. Valid Run Options

    Name Description Required
    imageId

    ID of the AMI with which to launch instances.

    Yes

    minCount

    Minimum number of instances to launch. Default: 1

    No

    maxCount

    Maximum number of instances to launch. Default: 1

    No

    keyName

    Name of the key pair with which to launch instances. If you do not provide a key, all instances will be inaccessible.

    No

    securityGroup

    Names of the security groups with which to associate the instances.

    No

    userData

    The user data available to the launched instances. This should not be Base64 encoded.

    No

    instanceType

    Specifies the instance type. Default: m1.small

    No

    placement

    Specifies the availability zone in which to launch the instance(s). By default, Amazon EC2 selects an availability zone for you.

    No

    kernelId

    The ID of the kernel with which to launch the instance.

    No

    ramdiskId

    The ID of the RAM disk with which to launch the instance.

    No

    blockDeviceVirtualName

    Specifies the virtual name to map to the corresponding device name. For example: instancestore0

    No

    blockDeviceName

    Specifies the device to which you are mapping a virtual name. For example: sdb

    No

    monitor

    Turn on AWS CloudWatch Instance Monitoring

    No


    run will return information about each instance that is starting up.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->run(array('imageId' => 'ami-509320',
                                       
    'keyName' => 'myKey',
                                       
    'securityGroup' => array('web',
                                                                
    'default')));

    Exemple 63.14. Rebooting an Ec2 Instances

    reboot will reboot one or more instances.

    This operation is asynchronous; it only queues a request to reboot the specified instance(s). The operation will succeed if the instances are valid and belong to the user. Requests to reboot terminated instances are ignored.

    reboot returns boolean TRUE or FALSE

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->reboot('instanceId');

    Exemple 63.15. Terminating an Ec2 Instances

    terminate shuts down one or more instances. This operation is idempotent; if you terminate an instance more than once, each call will succeed.

    terminate returns boolean TRUE or FALSE

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->terminate('instanceId');

    [Note] Terminated Instances

    Terminated instances will remain visible after termination (approximately one hour).

    63.5.3. Amazon Instance Utilities

    In this section you will find out how to retreive information, the console output and see if an instance contains a product code.

    Exemple 63.16. Describing Instances

    describe returns information about instances that you own.

    If you specify one or more instance IDs, Amazon EC2 returns information for those instances. If you do not specify instance IDs, Amazon EC2 returns information for all relevant instances. If you specify an invalid instance ID, a fault is returned. If you specify an instance that you do not own, it will not be included in the returned results.

    describe will return an array containing information on the instance.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->describe('instanceId');

    [Note] Terminated Instances

    Recently terminated instances might appear in the returned results. This interval is usually less than one hour. If you do not want terminated instances to be returned, pass in a second variable of boolean TRUE to describe and the terminated instances will be ignored.

    Exemple 63.17. Describing Instances By Image Id

    describeByImageId is functionally the same as describe but it will only return the instances that are using the provided imageId.

    describeByImageId will return an array containing information on the instances thare were started by the passed in imageId

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->describeByImageId('imageId');

    [Note] Terminated Instances

    Recently terminated instances might appear in the returned results. This interval is usually less than one hour. If you do not want terminated instances to be returned, pass in a second variable of boolean TRUE to describe and the terminated instances will be ignored.

    Exemple 63.18. Retreiving Console Output

    consoleOutput retrieves console output for the specified instance.

    Instance console output is buffered and posted shortly after instance boot, reboot, and termination. Amazon EC2 preserves the most recent 64 KB output which will be available for at least one hour after the most recent post.

    consoleOutput returns an array containing the instanceId, timestamp from the last output and the output from the console.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->consoleOutput('instanceId');

    Exemple 63.19. Confirm Product Code on an Instance

    confirmProduct returns TRUE if the specified product code is attached to the specified instance. The operation returns FALSE if the product code is not attached to the instance.

    The confirmProduct operation can only be executed by the owner of the AMI. This feature is useful when an AMI owner is providing support and wants to verify whether a user's instance is eligible.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->confirmProduct('productCode''instanceId');

    Exemple 63.20. Turn on CloudWatch Monitoring on an Instance(s)

    monitor returns the list of instances and their current state of the CloudWatch Monitoring. If the instance does not currently have Monitoring enabled it will be turned on.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->monitor('instanceId');

    Exemple 63.21. Turn off CloudWatch Monitoring on an Instance(s)

    monitor returns the list of instances and their current state of the CloudWatch Monitoring. If the instance currently has Monitoring enabled it will be turned off.

    $ec2_instance = new Zend_Service_Amazon_Ec2_Instance('aws_key',
                                                         
    'aws_secret_key');
    $return $ec2_instance->unmonitor('instanceId');

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