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» Home » Docs » Guides » Cloud management » Manage your Amazon EC2 instances

Manage your Amazon EC2 instances

Starting Point

In this howto i will show you how to create and manage your Amazon EC2 instances.

Preparation

Creating a Rexfile

At first you need to create a Rexfile in a directory of your choice.

$ mkdir amazon
$ cd amazon
$ touch Rexfile

Open the Rexfile in your preferred editor.

Insert the following code in your new Rexfile.

use Rex -feature => ['1.0'];
⁠use Rex::Commands::Cloud;
⁠
⁠user "root";
⁠public_key "/path/to/your/just/created/amazon-public.key";
⁠private_key "/path/to/your/just/downloaded/amazon-private-key.pem";
⁠
⁠my $access_key        = "your-access-key";
⁠my $secret_access_key = "your-secret-key";
⁠
⁠cloud_service "Amazon";
⁠cloud_auth "$access_key", "$secret_access_key";
⁠cloud_region "ec2.eu-west-1.amazonaws.com";
⁠
⁠task "create", sub {
⁠  cloud_instance create => {
⁠    image_id => "ami-02103876",
⁠    name     => "static01",
⁠    key      => "dev-test",
⁠  };
⁠};

This task create a new Amazon EC2 instance with no EBS block device.

Create an instance with an EBS block volume

Sometimes you need an instance with a persistent storage volume. To achieve this your can use an EBS block volume.

⁠task "create", sub {
⁠  my $vol_id = cloud_volume create => { size => 1, zone => "eu-west-1a", };
⁠  cloud_instance create => {
⁠    image_id => "ami-02103876",
⁠    name     => "static01",
⁠    key      => "dev-test",
⁠    volume   => $vol_id,
⁠    zone     => "eu-west-1a",
⁠  };
⁠};

Listing Regions and zones

To get a list of all regions and zone you can use the following functions.

⁠task "list", sub {
⁠  print Dumper get_cloud_regions;
⁠  print Dumper get_cloud_availability_zones;
⁠};

List your instances

To get a list of all your instances and volumes you can use these functions.

⁠task "list", sub {
⁠  print Dumper cloud_instance_list;
⁠  print Dumper cloud_volume_list;
⁠};

Destroy your instances / volumes

If you don't need your instances or volumes anymore, you can just destroy them.

⁠task "destroy", sub {
⁠  cloud_volume delete      => "$volume_id";
⁠  cloud_instance terminate => "$instance_id";
⁠};

Put all your EC2 instances in a host group

If you have many instances you can easily add them all into a hostgroup.

⁠group ec2 => get_cloud_instances_as_group();

Installing some Software and run Rex

Now we need to add some software to our fresh EC2 instance.

⁠task "prepare",
⁠  group => "ec2",
⁠  sub {
⁠  run "apt-get update";
⁠  install package => "apache2";
⁠
⁠  service apache2 => "ensure", "started";
⁠
⁠  # deploy your webapp, see Rex::Apache::Deploy for more information.  deploy "my-site.tar.gz";
⁠
⁠  # or upload some files  file "/etc/passwd", source => "/etc/passwd";
⁠
⁠  # do what ever you want  use Rex::Commands::Iptables;
⁠  close_port "all";
⁠  };

Now you can run Rex to create the instance and prepare the system for use.

$ rex create prepare
[2011-08-06 10:25:58] (5783) - INFO - Running task: create
[2011-08-06 10:26:38] (5783) - INFO - Running task: prepare
[2011-08-06 10:26:38] (5801) - INFO - Connecting to 46.51.135.11 (root)
[2011-08-06 10:27:14] (5801) - INFO - Installing apache2.
[2011-08-06 10:27:30] (5801) - INFO - Uploadling files/index.html -> /var/www/index.html
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