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Contents
description 'Example stack template for a small EC2 instance'
# NOTE: This template depends on vpc.rb
# You can use the `include_template` function to include other ruby files into this Cloudformation template.
include_template 'common/instance_deps.rb'
# We can define extensions to resources, which extend the basic JSON-building
# functionality of Cfer. Cfer provides a few of these, but you're free
# to define your own by using `Cfer::Core::Resource.extend_resource` and specifying a
# CloudFormation resource type. Inside the block, define any methods you'd like to use:
Cfer::Core::Resource.extend_resource "AWS::EC2::Instance" do
def boot_script(data)
# This function simply wraps a bash script in the little bit of extra
# sugar (hashbang + base64 encoding) that EC2 requires for userdata boot scripts.
# See the AWS docs here: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html
script = <<-EOS.strip_heredoc
#!/bin/bash
#{data}
EOS
user_data Base64.encode64(script)
end
end
resource :instance, "AWS::EC2::Instance" do
# Using the extension defined above, we can have the instance write a simple
# file to show that it's working. When you converge this template, there
# should be a `welcome.txt` file sitting in the `ubuntu` user's home directory.
boot_script "echo 'Welcome to Cfer!' > /home/ubuntu/welcome.txt"
image_id Fn::ref(:ImageId)
instance_type Fn::ref(:InstanceType)
key_name Fn::ref(:KeyName)
network_interfaces [ {
AssociatePublicIpAddress: "true",
DeviceIndex: "0",
GroupSet: [ Fn::ref(:instancesg) ],
SubnetId: Fn::ref(:SubnetId)
} ]
end
output :instance, Fn::ref(:instance)
output :instanceip, Fn::get_att(:instance, :PublicIp)
Version data entries
14 entries across 14 versions & 1 rubygems