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Kitchen::Ec2: A Test Kitchen Driver for Amazon EC2

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A Test Kitchen Driver for Amazon EC2.

This driver uses the aws sdk gem to provision and destroy EC2 instances. Use Amazon's cloud for your infrastructure testing!

Initial Setup

To get started, you need to install the software and set up your credentials and SSH key. Some of these steps you have probably already done, but we include them here for completeness.

  1. Install the latest test-kitchen or ChefDK and put it in your path.

  2. From this repository, type bundle install; bundle exec rake install to install the latest version of the driver.

  3. Install the AWS command line tools.

  4. Run aws configure to place your AWS credentials on the drive at ~/.aws/credentials.

  5. Create your AWS SSH key. We recommend naming it with your username, but you can use any name:

    aws ec2 create-key-pair --key-name $USER | ruby -e "require 'json'; puts JSON.parse(STDIN.read)['KeyMaterial']" > ~/.ssh/$USER

  6. export AWS_SSH_KEY_ID=<your key name>

Quick Start

Once that is done, create your kitchen file in your cookbook directory (or an empty directory if you just want to get a feel for it):

  1. kitchen init -D ec2

  2. Edit .kitchen.yml and add the aws_ssh_key_id to driver and a transport with an ssh_key:

    transport:
  ssh_key: ~/.ssh/your_private_key_file

  3. While you are in there, modify centos-7.1 to centos-7.

  4. kitchen test

It's that easy! This will set up and run centos and ubuntu flavored instances.

Requirements

There are no external system requirements for this driver. However you will need access to an AWS account. IAM users should have, at a minimum, permission to manage the lifecycle of an EC2 instance along with modifying components specified in kitchen driver configs. Consider using a permissive managed IAM policy like arn:aws:iam::aws:policy/AmazonEC2FullAccess or tailor one specific to your security requirements.

Configuration

By automatically applying reasonable defaults wherever possible, kitchen-ec2 does a lot of work to make your life easier. Here is a description of some of the configuration parameters and what we do to default them.

Specifying the Image

There are three ways to specify the image you use for the instance: image_id, image_search and platform.name

image_id

image_id can be set explicitly. It must be an ami in the region you are working with!

platforms:
  - name: centos-7
    image_id: ami-96a818fe

image_id's have a format like ami-748e2903. The image_id values appear next to the image names when you select 'Launch Instance' from the AWS EC2 console. You can also see the list from the AWS CLI aws ec2 describe-images.

image_search

image_search lets you specify a series of key/value pairs to search for the image. If a value is set to an array, then any of those values will match. You can learn more about the available filters in the AWS CLI doc under --filters here.

platforms:
  - name: ubuntu-14.04
    driver:
      image_search:
        owner-id: "099720109477"
        name: ubuntu/images/*/ubuntu-*-14.04*

In the event that there are multiple matches (as sometimes happens), we sort to get the best results. In order of priority from greatest to least, we prefer:

  • HVM images over paravirtual
  • SSD support over magnetic drives
  • 64-bit over 32-bit
  • The most recently created image (to pick up patch releases)

Note that the image_search method requires that the AMI image names be in a specific format. Some examples are:

  • Windows-2012
  • Windows-2012r2
  • Windows-2012r2sp1
  • RHEL-7.2

It is safest to use the same naming convention as used by the public images published by the OS vendors on the AWS marketplace.

platform.name

The third way to specify the image is by leaving image_id and image_search blank, and specifying a standard platform name.

platforms:
  - name: ubuntu-14.04

If you use the platform name ubuntu, windows, rhel, debian, centos, freebsd or fedora, kitchen-ec2 will search for the latest matching official image of the given OS in your region. You may leave versions off, specify partial versions, and you may specify architecture to distinguish 32- and 64-bit. Some examples:

platforms:
  # The latest stable minor+patch release of rhel 6
  - name: rhel-6
  # The latest patch release of CentOS 6.3
  - name: centos-6.3
  # 32-bit version of latest major+minor+patch release of Ubuntu
  - name: ubuntu-i386
  # 32-bit version of Debian 6
  - name: debian-6-i386
  # Latest 32-bit stable minor release of freebsd 10
  - name: freebsd-10-i386
  # The latest stable major+minor+patch release of Fedora
  - name: fedora
  # The most recent service-pack for Windows 2012 (not R2)
  - name: windows-2012
  # The most recent service-pack for Windows 2012R2
  - name: windows-2012r2
  # Windows 2008 RTM (not R2, no service pack)
  - name: windows-2008rtm
  # Windows 2008R2 SP1
  - name: windows-2008r2sp1

We always pick the highest released stable version that matches your regex, and follow the other image_search rules for preference.

AWS Authentication

In order to connect to AWS, you must specify the AWS access key id and secret key for your account. There are 3 ways you do this, and we will try them in the following order:

  1. You can specify the access key and access secret (and optionally the session token) through config. See the aws_access_key_id and aws_secret_access_key config sections below to see how to specify these in your .kitchen.yml or through environment variables. If you would like to specify your session token use the environment variable AWS_SESSION_TOKEN.
  2. The shared credentials ini file at ~/.aws/credentials. This is the file populated by aws configure command line and used by AWS tools in general, so if you are set up for any other AWS tools, you probably already have this. You can specify multiple profiles in this file and select one with the AWS_PROFILE environment variable or the shared_credentials_profile driver config. Read this for more information.
  3. From an instance profile when running on EC2. This accesses the local metadata service to discover the local instance's IAM instance profile.

This precedence order is taken from http://docs.aws.amazon.com/sdkforruby/api/index.html#Configuration

The first method attempted that works will be used. IE, if you want to auth using the instance profile, you must not set any of the access key configs or environment variables, and you must not specify a ~/.aws/credentials file.

Because the Test Kitchen test should be checked into source control and ran through CI we no longer recommend storing the AWS credentials in the .kitchen.yml file. Instead, specify them as environment variables or in the ~/.aws/credentials file.

Instance Login Configuration

The instances you create use credentials you specify which are separate from the AWS credentials. Generally, SSH and WinRM use an AWS key pair which you specify. You probably set this up in the Initial Setup.

aws_ssh_key_id

The ID of the AWS key pair you want to use.

The default will be read from the AWS_SSH_KEY_ID environment variable if set, or nil otherwise.

If aws_ssh_key_id is specified, it must be one of the KeyName values shown by the AWS CLI: aws ec2 describe-key-pairs. Otherwise, if not specified, you must either have a user pre-provisioned on the AMI, or provision the user using user_data.

transport.ssh_key

The private key file for the AWS key pair you want to use.

transport.username

This is not strictly a driver thing, but the username is a crucial component of logging in to an instance. Different AMIs tend to provide different usernames.

If you use an official AMI (or create an image with the platform name in the image name), we will use the default username for official AMIs for that platform.

ebs_optimized

Option to launch EC2 instance with optimized EBS volume. See Amazon EC2 Instance Types to find out more about instance types that can be launched as EBS-optimized instances.

The default is false.

Password

For Windows instances the generated Administrator password is fetched automatically from Amazon EC2 with the same private key as we use for SSH logins to Linux.

Windows Configuration

If you specify a platform name starting with windows, Test Kitchen will pull a default AMI out of amis.json if one is not specified.

The default user_data will add any username with its associated password from the transport options to the Aministrator group. If no username is specified then the default administrator is available.

AWS automatically generates an administrator password in the default Windows AMIs. Test Kitchen fetches this and stores it in the .kitchen/#{platform}.json file. If you need to kitchen login to the instance and you have not specified your own username and password you can use the administrator user and the password from this file. Unfortunately we cannot auto-fill the RDP password at this point.

Other Configuration

availability_zone

The AWS availability zone to use. Only request the letter designation - will attach this to the region used.

If not specified, your instances will be placed in an AZ of AWS's choice in your region.

instance_type

The EC2 instance type (also known as size) to use.

The default is t2.micro or t1.micro, depending on whether the image is hvm or paravirtual. (paravirtual images are incompatible with t2.micro.)

security_group_ids

An Array of EC2 security groups which will be applied to the instance.

The default is ["default"].

region

Required The AWS region to use.

If the environment variable AWS_REGION is populated that will be used. Otherwise the default is "us-east-1".

subnet_id

The EC2 subnet to use.

The default is unset, or nil.

tags

The Hash of EC tag name/value pairs which will be applied to the instance.

The default is { "created-by" => "test-kitchen" }.

user_data

The user_data script or the path to a script to feed the instance. Use bash to install dependencies or download artifacts before chef runs. This is just for some cases. If you can do the stuff with chef, then do it with chef!

On linux instances the default is unset, or nil.

On Windows instances we specify a default that enables winrm and adds a non-administrator user specified in the username transport options to the Administrator's User Group.

iam_profile_name

The EC2 IAM profile name to use.

The default is nil.

spot_price

The price you bid in order to submit a spot request. An additional step will be required during the spot request process submission. If no price is set, it will use an on-demand instance.

The default is nil.

instance_initiated_shutdown_behavior

Control whether an instance should stop or terminate when shutdown is initiated from the instance using an operating system command for system shutdown.

The default is nil.

block_duration_minutes

The specified duration for a spot instance, in minutes. This value must be a multiple of 60 (60, 120, 180, 240, 300, or 360). If no duration is set, the spot instance will remain active until it is terminated.

The default is nil.

http_proxy

Specify a proxy to send AWS requests through. Should be of the format http://<host>:<port>.

The default is ENV["HTTPS_PROXY"] || ENV["HTTP_PROXY"]. If you have these environment variables set and do not want to use a proxy when contacting aws set http_proxy: nil.

Note - The AWS command line utility allow you to specify two proxies, one for HTTP and one for HTTPS. The AWS Ruby SDK only allows you to specify 1 proxy and because all requests are https:// this proxy needs to support HTTPS.

Disk Configuration

block_device_mappings

A list of block device mappings for the machine. An example of all available keys looks like:

block_device_mappings:
  - device_name: /dev/sda
    ebs:
      volume_size: 20
      delete_on_termination: true
  - device_name: /dev/sdb
    ebs:
      volume_type: gp2
      virtual_name: test
      volume_size: 15
      delete_on_termination: true
      snapshot_id: snap-0015d0bc
  - device_name: /dev/sdc
    ebs:
      volume_size: 100
      delete_on_termination: true
      volume_type: io1
      iops: 100

See Amazon EBS Volume Types to find out more about volume types.

If you have a block device mapping with a device_name equal to the root storage device name on your image then the provided mapping will replace the settings in the image.

If this is not provided it will use the default block_device_mappings from the AMI.

ebs_optimized

Option to launch EC2 instance with optimized EBS volume. See Amazon EC2 Instance Types to find out more about instance types that can be launched as EBS-optimized instances.

The default is false.

Network and Communication Configuration

associate_public_ip

AWS does not automatically allocate public IP addresses for instances created within non-default subnets. Set this option to true to force allocation of a public IP and associate it with the launched instance.

If you set this option to false when launching into a non-default subnet, Test Kitchen will be unable to communicate with the instance unless you have a VPN connection to your Virtual Private Cloud.

The default is true if you have configured a subnet_id, or false otherwise.

private_ip_address

The primary private IP address of your instance.

If you don't set this it will default to whatever DHCP address EC2 hands out.

interface

The place from which to derive the hostname for communicating with the instance. May be dns, public, private or private_dns. If this is unset, the driver will derive the hostname by failing back in the following order:

  1. DNS Name
  2. Public IP Address
  3. Private IP Address
  4. Private DNS Name

The default is unset. Under normal circumstances, the lookup will return the Private IP Address.

If the Private DNS Name is preferred over the private IP, it must be specified in the .kitchen.yml file

driver:
  interface: private_dns

Example

The following could be used in a .kitchen.yml or in a .kitchen.local.yml to override default configuration.

---
driver:
  name: ec2
  aws_ssh_key_id: id_rsa-aws
  security_group_ids: ["sg-1a2b3c4d"]
  region: us-west-2
  availability_zone: b
  require_chef_omnibus: true
  subnet_id: subnet-6e5d4c3b
  iam_profile_name: chef-client
  instance_type: m3.medium
  associate_public_ip: true
  interface: dns

transport:
  ssh_key: /path/to/id_rsa-aws
  connection_timeout: 10
  connection_retries: 5
  username: ubuntu

platforms:
  - name: ubuntu-12.04
  - name: centos-6.4
  - name: ubuntu-15.04
    driver:
      image_id: ami-83211eb3
      block_device_mappings:
        - device_name: /dev/sda1
          ebs:
            volume_type: standard
            virtual_name: test
            volume_size: 15
            delete_on_termination: true
  - name: centos-7
    driver:
      image_id: ami-c7d092f7
      block_device_mappings:
        - device_name: /dev/sdb
          ebs:
            volume_type: gp2
            virtual_name: test
            volume_size: 8
            delete_on_termination: true
    transport:
      username: centos
  - name: windows-2012r2
  - name: windows-2008r2

suites:
# ...

Development

Pull requests are very welcome! Make sure your patches are well tested. Ideally create a topic branch for every separate change you make. For example:

  1. Fork the repo
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Authors

Created and maintained by Fletcher Nichol ([email protected])

License

Apache 2.0 (see LICENSE)