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Ruby script to start and stop instances

How to use the script below

Requirements:

Two files are required: ~/.aws/config and a file containing instances ids, one per line, eg:

~/.aws/config

[default]
aws_access_key_id=AKIAF06E7MXBSH9DHM02
aws_secret_access_key=kWcrlUX5JEDGM/LtmEENI/aVmYvHNif5zB+d9+ct
region=us-east-1

[cluster]
aws_access_key_id=AKIA4DAD763960B530FA
aws_secret_access_key=kof1RHSpNWAaoWb52LLXCak5N8ycQsiOoOCajq5D
region=sa-east-1

The defined variables are straightforward, and the name between brackets are for multiple key pairs.

instances.txt

i-1a40b6e3
i-ccf8a6bf
i-fdb5a545

Sample execution:

$ ruby script.rb -i ~/instances.txt --start
require 'aws-sdk'
require 'optparse'
require 'yaml'
class PreConfiguration
class << self
def setup options
@@profiles = Hash.new { |hash, key| hash[key] = {} }
load_config_file
load_profiles
select_profile
config_aws
load_instances options
end
def instances
@@instances
end
private
def load_config_file
begin
@@config_file = File.open(Dir.home + '/.aws/config', 'r')
rescue Errno::ENOENT => e
puts "AWS config file doesn't exist. Create at ~/.aws/config"
raise
end
end
def load_profiles
active_profile = ''
@@config_file.readlines.each do |line|
if /^\[(.*)\]$/.match line.strip
active_profile = $1
elsif /(\S+)(?:\s)*=(?:\s)*(\S+)/.match line.strip
@@profiles[active_profile][$1.to_sym] = $2
end
end
end
def select_profile
puts 'Available profiles: '
@@profiles.keys.sort.each_with_index { |k, idx| puts "#{idx + 1}. #{k}" }
profile_idx = nil
begin
print "Please choose a valid profile: "
profile_idx = gets.chomp.to_i
end until profile_idx.between? 1, @@profiles.size
@@profile = @@profiles[@@profiles.keys.sort[profile_idx - 1]]
end
def config_aws
AWS.config access_key_id: @@profile[:aws_access_key_id],
secret_access_key: @@profile[:aws_secret_access_key],
region: @@profile[:region]
end
def load_instances options
begin
@@instances = File.open(options[:instances], 'r').map do |l|
l.strip.downcase unless l.empty? || l.nil?
end
rescue Errno::ENOENT
abort "The specified instances file doesn't exist"
end
end
end
end
class EC2Instance
def initialize instance_id
@aws_i = AWS.ec2.instances[instance_id]
end
def start
@aws_i.start
sleep 3 until @aws_i.status == :running
puts "Instance #{@aws_i.tags['Name']} is running"
end
def stop
if @aws_i.status == :stopped
puts "Instance #{@aws_i.tags['Name']} was already stopped"
return
else
@aws_i.stop
sleep 3 until @aws_i.status == :stopped
puts "Instance #{@aws_i.tags['Name']} stopped"
end
end
def status
puts "Instance #{@aws_i.tags['Name']} is #{@aws_i.status}"
end
end
options = {}
OptionParser.new do |opts|
opts.banner = "Usage: script.rb [options]"
opts.on('-i', '--instances INSTANCES_FILE', '=MANDATORY', 'File containing instances') { |v| options[:instances] = v }
opts.on('--start', 'Start the instances') { |v| options[:start] = v }
opts.on('--stop', 'Stop the instances') { |v| options[:stop] = v }
opts.on('--status', 'Retrieve the status of the instances') { |v| options[:status] = v }
end.parse!
if $0 == __FILE__
raise OptionParser::MissingArgument, "--instances INSTANCES_FILE" if options[:instances].nil?
raise OptionParser::MissingArgument, "--start OR --stop OR --status" if options[:start].nil? && options[:stop].nil? && options[:status].nil?
end
PreConfiguration.setup options
PreConfiguration.instances.each do |i_str|
i = EC2Instance.new i_str
if options[:start]
i.start
elsif options[:stop]
i.stop
elsif options[:status]
i.status
end
end
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