Created
September 12, 2016 17:58
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simple snapshotting script
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| #!/opt/chef/embedded/bin/ruby | |
| # | |
| # Create/manage Cinder volume snapshots | |
| # | |
| require 'mixlib/shellout' | |
| require 'fog/openstack' | |
| # | |
| # Assemble our SnapshotRobot | |
| # | |
| class SnapshotRobot | |
| attr_accessor :client, :options, :server, :volume | |
| def initialize(opts) | |
| @client = Fog::Compute.new( | |
| provider: :openstack, openstack_tenant: ENV['OS_TENANT_NAME'], | |
| openstack_username: ENV['OS_USERNAME'], openstack_api_key: ENV['OS_PASSWORD'], | |
| openstack_auth_url: "#{ENV['OS_AUTH_URL']}/tokens" | |
| ) | |
| @options = opts | |
| server_id = File.read('/var/lib/cloud/data/instance-id').chomp | |
| @server = @client.servers.get(server_id) | |
| @volume = @client.volumes.detect do |vol| | |
| vol.attachments.first['serverId'] == server.id | |
| end | |
| end | |
| def run! | |
| stop! | |
| snap! | |
| start! | |
| end | |
| private | |
| def stop! | |
| manage_units!(:stop, @options[:services]) | |
| manage_units!(:kill, @options[:services]) if @options[:kill] | |
| manage_units!(:stop, @options[:mounts]) | |
| end | |
| def snap! | |
| detach_volume!(@server, @volume) | |
| create_snapshot!(@volume) | |
| attach_volume!(@server, @volume) | |
| Mixlib::ShellOut.new('systemctl daemon-reload').run_command | |
| end | |
| def start! | |
| manage_units!(:start, @options[:mounts]) | |
| manage_units!(:start, @options[:services]) | |
| end | |
| def manage_units!(action, unit_list) | |
| unit_list.each do |unit| | |
| Mixlib::ShellOut | |
| .new("systemctl #{action} #{unit}", timeout: 3_600) | |
| .tap(&:run_command) | |
| .error! | |
| end | |
| end | |
| def detach_volume!(server, volume) | |
| server.detach_volume(volume.id) | |
| volume.wait_for { status == 'available' } | |
| end | |
| def create_snapshot!(volume) | |
| name = "#{@volume.name}-#{Time.now.to_i}" | |
| @client.create_snapshot(volume.id, name, 'Roderick was here.') | |
| @client.snapshots | |
| .find { |snap| snap.name == name } | |
| .wait_for { status == 'available' } | |
| end | |
| def attach_volume!(server, volume) | |
| server.attach_volume(volume.id, '/dev/vdb') | |
| volume.wait_for { status == 'in-use' } | |
| end | |
| end | |
| # | |
| # Turn the SnapshotRobot loose. | |
| # Isn't little Roderick so cute? | |
| # | |
| require 'optparse' | |
| options = {} | |
| optparser = OptionParser.new do |opts| | |
| opts.banner = 'Usage: create-cinder-snapshot.rb [options]' | |
| opts.on('--services x,y,z', Array, 'Services to stop/start.') do |s| | |
| options[:services] = s | |
| end | |
| opts.on('--mounts x,y,z', Array, 'Mount units to umount/mount.') do |m| | |
| options[:mounts] = m | |
| end | |
| opts.on('--kill', 'Kill services after stopping.') do |k| | |
| options[:kill] = k | |
| end | |
| end | |
| optparser.parse! | |
| begin | |
| puts "Starting snapshotting." | |
| roderick = SnapshotRobot.new(options) | |
| roderick.run! | |
| rescue StandardError => error | |
| puts "Failed snapshotting!" | |
| puts "ERROR: #{error.message}" | |
| else | |
| puts "Finished snapshotting." | |
| ensure | |
| puts 'Going into sleep mode.' | |
| end |
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example usage: