Google Cloud Compute Engine PHP Samples - Instances
===================================================

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This directory contains samples for calling [Google Cloud Compute Engine][compute] APIs
from PHP. Specifically, they show how to manage your Compute Engine [instances][instances].

[compute]: https://cloud.google.com/compute/docs/apis
[instances]: https://cloud.google.com/compute/docs/instances/stop-start-instance

## Setup

### Authentication

Authentication is typically done through [Application Default Credentials][adc]
which means you do not have to change the code to authenticate as long as
your environment has credentials. You have a few options for setting up
authentication:

1. When running locally, use the [Google Cloud SDK][google-cloud-sdk]

        gcloud auth application-default login

1. When running on App Engine or Compute Engine, credentials are already
   set. However, you may need to configure your Compute Engine instance
   with [additional scopes][additional_scopes].

1. You can create a [Service Account key file][service_account_key_file]. This file can be used to
   authenticate to Google Cloud Platform services from any environment. To use
   the file, set the ``GOOGLE_APPLICATION_CREDENTIALS`` environment variable to
   the path to the key file, for example:

        export GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account.json

[adc]: https://cloud.google.com/docs/authentication#getting_credentials_for_server-centric_flow
[additional_scopes]: https://cloud.google.com/compute/docs/authentication#using
[service_account_key_file]: https://developers.google.com/identity/protocols/OAuth2ServiceAccount#creatinganaccount

## Install Dependencies

1. **Install dependencies** using [Composer](http://getcomposer.org/doc/00-intro.md).
    Run `php composer.phar install` (if composer is installed locally) or `composer install`
    (if composer is installed globally).

1. Create a [service account](https://cloud.google.com/iam/docs/creating-managing-service-accounts#creating).

1. [Download the json key file](https://cloud.google.com/iam/docs/creating-managing-service-account-keys#getting_a_service_account_key)
   of the service account.

1. Set the `GOOGLE_APPLICATION_CREDENTIALS` environment variable pointing to that file.

## Samples

To run the Compute samples, run any of the files in `src/` on the CLI to print
the usage instructions:

```
$ php src/list_instances.php

Usage: list_instances.php $projectId $zone

  @param string $projectId Your Google Cloud project ID.
  @param string $zone The zone to create the instance in (e.g. "us-central1-a")
```

### Create an instance

```
$ php src/create_instance.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name"
Created instance my-new-instance-name
```

### List instances

```
$ php src/list_instances.php $YOUR_PROJECT_ID "us-central1-a"
Instances for YOUR_PROJECT_ID (us-central1-a)
 - my-new-instance-name
```

### List all instances

```
$ php src/list_all_instances.php $YOUR_PROJECT_ID
All instances for YOUR_PROJECT_ID
Zone - zones/us-central1-a
 - my-new-instance-name
Zone - zones/us-central1-b
 - my-new-instance-name-2
 - my-new-instance-name-3
```

### Stop an instance

```
$ php src/stop_instance.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name"
Instance my-new-instance-name stopped successfully
```

### Start an instance

```
$ php src/start_instance.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name"
Instance my-new-instance-name started successfully
```

### Start an instance with encrypted disk

```
$ php src/start_instance_with_encryption_key.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name" $ENC_KEY
Instance my-new-instance-name started successfully
```

### Reset an instance

```
$ php src/reset_instance.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name"
Instance my-new-instance-name reset successfully
```

### Delete an instance

```
$ php src/delete_instance.php $YOUR_PROJECT_ID "us-central1-a" "my-new-instance-name"
Deleted instance my-new-instance-name
```

### Set usage export bucket

```
$ php src/set_usage_export_bucket.php $YOUR_PROJECT_ID "my-gcs-bucket-name" "my-report-name-prefix"
```

### Get usage export bucket

```
$ php src/get_usage_export_bucket.php $YOUR_PROJECT_ID
```

### Disable usage export bucket

```
$ php src/disable_usage_export_bucket.php $YOUR_PROJECT_ID
```

## Troubleshooting

If you get the following error, set the environment variable `GCLOUD_PROJECT` to your project ID:

```
[Google\Cloud\Core\Exception\GoogleException]
No project ID was provided, and we were unable to detect a default project ID.
```

## The client library

This sample uses the [Google Cloud Compute Client Library for PHP][google-cloud-php-compute].
You can read the documentation for more details on API usage and use GitHub
to [browse the source][google-cloud-php-source] and [report issues][google-cloud-php-issues].

[google-cloud-php-compute]: https://cloud.google.com/php/docs/reference/cloud-compute/latest
[google-cloud-php-source]: https://github.com/GoogleCloudPlatform/google-cloud-php
[google-cloud-php-issues]: https://github.com/GoogleCloudPlatform/google-cloud-php/issues
[google-cloud-sdk]: https://cloud.google.com/sdk/