Class: Dcmgr::Drivers::Lxc

Inherits:
Hypervisor show all
Includes:
Helpers::CliHelper, Logger
Defined in:
lib/dcmgr/drivers/lxc.rb

Instance Method Summary collapse

Methods included from Helpers::CliHelper

#sh, #tryagain

Methods included from Logger

create, default_logdev, included

Methods inherited from Hypervisor

select_hypervisor

Instance Method Details

#attach_volume_to_guest(ctx) ⇒ Object 



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# File 'lib/dcmgr/drivers/lxc.rb', line 77

def attach_volume_to_guest(ctx)
  sddev = File.expand_path(File.readlink(ctx.os_devpath), '/dev/disk/by-path')

  # find major number and minor number to device file
  stat = File.stat(sddev)
  devnum = [stat.rdev_major,stat.rdev_minor].join(':')

  sh("echo \"b #{devnum} rwm\" > /cgroup/#{ctx.inst_id}/devices.allow")
  logger.debug("Makinging new block device: #{ctx.inst_data_dir}/rootfs#{sddev}")
  sh("mknod #{ctx.inst_data_dir}/rootfs#{sddev} -m 660 b #{stat.rdev_major} #{stat.rdev_minor}")

  config_path = "#{ctx.inst_data_dir}/config.#{ctx.inst_id}"
  File.open(config_path, 'a+') { |f|
    f.puts "lxc.cgroup.devices.allow = b #{devnum} rwm"
  }

  devnum
end

#detach_volume_from_guest(ctx) ⇒ Object 



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# File 'lib/dcmgr/drivers/lxc.rb', line 96

def detach_volume_from_guest(ctx)
  vol = ctx.vol
  sddev = File.expand_path(File.readlink(vol[:host_device_name]), '/dev/disk/by-path')
  devnum = vol[:guest_device_name]

  sh("echo \"b #{devnum} rwm\" > /cgroup/#{ctx.inst_id}/devices.deny")
  logger.debug("Deleting block device: #{ctx.inst_data_dir}/rootfs#{sddev}")
  sh("rm #{ctx.inst_data_dir}/rootfs#{sddev}")

  config_path = "#{ctx.inst_data_dir}/config.#{ctx.inst_id}"
  config_body = File.open(config_path, 'r') { |f|
    f.readlines.select {|line| line != "lxc.cgroup.devices.allow = b #{devnum} rwm\n" }
  }
  File.open(config_path, 'w') { |f|
    f.write config_body
  }
end

#reboot_instance(ctx) ⇒ Object 



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# File 'lib/dcmgr/drivers/lxc.rb', line 72

def reboot_instance(ctx)
  sh("lxc-stop -n #{ctx.inst[:uuid]}")
  sh("lxc-start -n %s -d -l DEBUG -o %s/%s.log 3<&- 4<&- 6<&-", [ctx.inst[:uuid], ctx.inst_data_dir, ctx.inst[:uuid]])
end

#run_instance(ctx) ⇒ Object 



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# File 'lib/dcmgr/drivers/lxc.rb', line 11

def run_instance(ctx)
  # run lxc
  @os_devpath = ctx.os_devpath
  if @os_devpath.nil?
    if ctx.inst[:image][:boot_dev_type] == 1
      ctx.inst[:volume].each{ |vol_id, vol|
        @os_devpath = vol[:host_device_name] if vol[:boot_dev] == 1
      }
    else
      @os_devpath = "#{ctx.inst_data_dir}/#{ctx.inst_id}"
    end
  end
  # check mount point
  mount_point = "#{ctx.inst_data_dir}/rootfs"
  Dir.mkdir(mount_point) unless File.exists?(mount_point)

  cmd = "mount %s %s"
  args = [@os_devpath, mount_point]
  if ctx.inst[:image][:boot_dev_type] == 2
    cmd += " -o loop"
  end
  sh(cmd, args)

  # metadata drive
  metadata_path = "#{ctx.inst_data_dir}/rootfs/metadata"
  Dir.mkdir(metadata_path) unless File.exists?(metadata_path)
  sh("mount -t vfat -o loop -o ro #{ctx.metadata_img_path} #{metadata_path}")

  config_path = create_config(ctx)
  create_fstab(ctx)
  setup_container(ctx)
  mount_cgroup

  # Ubuntu 10.04.3 LTS
  # Linux ubuntu 2.6.38-10-generic #46~lucid1-Ubuntu SMP Wed Jul 6 18:40:11 UTC 2011 i686 GNU/Linux
  # Linux ubuntu 2.6.38-8-server #42-Ubuntu SMP Mon Apr 11 03:49:04 UTC 2011 x86_64 GNU/Linux
  # lxc 0.7.4-0ubuntu7
  #
  # Ubuntu-10.04.3 on Virtualbox-4.0.12 r72916 on Windows-7
  # Ubuntu-10.10
  #
  # > lxc-start 1311803515.629 ERROR    lxc_start - inherited fd 3 on pipe:[58281]
  # > lxc-start 1311803515.629 ERROR    lxc_start - inherited fd 4 on pipe:[58281]
  # > lxc-start 1311803515.629 ERROR    lxc_start - inherited fd 6 on socket:[58286]
  #
  # http://comments.gmane.org/gmane.linux.kernel.containers.lxc.general/912
  # http://comments.gmane.org/gmane.linux.kernel.containers.lxc.general/1400
  lxc_version = `lxc-version`.chomp.split(': ').last
  logger.debug("lxc-version: #{lxc_version}")

  sh("lxc-create -f %s -n %s", [config_path, ctx.inst[:uuid]])
  sh("lxc-start -n %s -d -l DEBUG -o %s/%s.log 3<&- 4<&- 6<&-", [ctx.inst[:uuid], ctx.inst_data_dir, ctx.inst[:uuid]])
end

#terminate_instance(ctx) ⇒ Object 



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# File 'lib/dcmgr/drivers/lxc.rb', line 65

def terminate_instance(ctx)
  sh("lxc-stop -n #{ctx.inst_id}")
  sh("lxc-destroy -n #{ctx.inst_id}")
  sh("umount #{ctx.inst_data_dir}/rootfs/metadata")
  sh("umount #{ctx.inst_data_dir}/rootfs")
end