Class: Bosh::Agent::Message::MigrateDisk

Inherits:
Base show all
Defined in:
lib/bosh_agent/message/migrate_disk.rb

Overview

Migrates persistent data from the old persistent disk to the new persistent disk.

This message assumes that two mount messages have been received and processed: one to mount the old disk at /var/vcap/store and a second to mount the new disk at /var/vcap/store_migraton_target (sic).

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#base_dir, #handler_error, #logger, #logs_dir, #settings, #store_migration_target, #store_path

Class Method Details

.long_running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bosh_agent/message/migrate_disk.rb', line 14

def self.long_running?; true; end

.process(args) ⇒ Object 



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# File 'lib/bosh_agent/message/migrate_disk.rb', line 16

def self.process(args)
  #logger = Bosh::Agent::Config.logger
  #logger.info("MigrateDisk:" + args.inspect)

  self.new.migrate(args)
  {}
end

Instance Method Details

#migrate(args) ⇒ Object 



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# File 'lib/bosh_agent/message/migrate_disk.rb', line 24

def migrate(args)
  logger.info("MigrateDisk:" + args.inspect)
  @old_cid, @new_cid = args

  DiskUtil.umount_guard(store_path)

  mount_store(@old_cid, read_only: true)

  if check_mountpoints
    logger.info("Copy data from old to new store disk")
    `(cd #{store_path} && tar cf - .) | (cd #{store_migration_target} && tar xpf -)`
  end

  DiskUtil.umount_guard(store_path)
  DiskUtil.umount_guard(store_migration_target)

  mount_store(@new_cid)
end