Class: Wakame::Service::MySQL_Slave

Inherits:
Property
  • Object
show all
Defined in:
lib/wakame/service.rb

Constant Summary

Constants included from AttributeHelper

AttributeHelper::CONVERT_CLASSES, AttributeHelper::PRIMITIVE_CLASSES

Instance Attribute Summary collapse

Attributes inherited from Property

#check_time, #vm_spec

Instance Method Summary collapse

Methods inherited from Property

#dump_status, #on_child_changed, #on_parent_changed, #reload, #render_config

Methods included from AttributeHelper

#dump_attrs

Constructor Details

#initialize ⇒ MySQL_Slave

Returns a new instance of MySQL_Slave.



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# File 'lib/wakame/service.rb', line 749

def initialize
  super()
  @template = ConfigurationTemplate::MySQLSlaveTemplate.new()
  @basedir = '/home/wakame/mysql'

  @mysqld_server_id = 2 # dynamic
  @mysqld_port = 3307
  @mysqld_datadir = File.expand_path('data-slave', @basedir)

  @ebs_volume = 'vol-38bc5f51'  # master volume_id
  @ebs_device = '/dev/sdn'      # slave mount point
  @ebs_mount_option = 'noatime'

  @mysqld_master_host = '10.249.2.115'
  @mysqld_master_user = 'wakame-repl'
  @mysqld_master_pass = 'wakame-slave'
  @mysqld_master_port = 3306
  @mysqld_master_datadir = File.expand_path('data', @basedir)

  @duplicable = false
end

Instance Attribute Details

#basedir ⇒ Object (readonly)

Returns the value of attribute basedir.



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# File 'lib/wakame/service.rb', line 747

def basedir
  @basedir
end

#ebs_device ⇒ Object (readonly)

Returns the value of attribute ebs_device.



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# File 'lib/wakame/service.rb', line 747

def ebs_device
  @ebs_device
end

#ebs_volume ⇒ Object (readonly)

Returns the value of attribute ebs_volume.



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# File 'lib/wakame/service.rb', line 747

def ebs_volume
  @ebs_volume
end

#mysqld_datadir ⇒ Object (readonly)

Returns the value of attribute mysqld_datadir.



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# File 'lib/wakame/service.rb', line 747

def mysqld_datadir
  @mysqld_datadir
end

#mysqld_log_bin ⇒ Object (readonly)

Returns the value of attribute mysqld_log_bin.



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# File 'lib/wakame/service.rb', line 747

def mysqld_log_bin
  @mysqld_log_bin
end

#mysqld_port ⇒ Object (readonly)

Returns the value of attribute mysqld_port.



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# File 'lib/wakame/service.rb', line 747

def mysqld_port
  @mysqld_port
end

#mysqld_server_id ⇒ Object (readonly)

Returns the value of attribute mysqld_server_id.



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# File 'lib/wakame/service.rb', line 747

def mysqld_server_id
  @mysqld_server_id
end

Instance Method Details

#before_start(svc, action) ⇒ Object 



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# File 'lib/wakame/service.rb', line 771

def before_start(svc, action)
  vm_manipulator = VmManipulator.create

  Wakame.log.debug("mkdir #{@mysqld_datadir}")
  system("[ -d #{@mysqld_datadir} ] || mkdir -p #{@mysqld_datadir}")
  Wakame.log.debug("[ -b #{@ebs_device} ]")
  system("[ -b #{@ebs_device} ]")
  if $? == 0
    Wakame.log.debug("The EBS volume(slave) device is not ready to attach: #{@ebs_device}")
    return
  end

  volume_map = vm_manipulator.describe_volume(@ebs_volume)
  Wakame.log.debug("describe_volume(#{@ebs_volume}): #{volume_map.inspect}")
  if volume_map['status'] == 'in-use'
    # Nothin to be done
  else
    Wakame.log.debug("The EBS volume(slave) is not ready to attach: #{@ebs_volume}")
    return
  end

  system("echo show master status | /usr/bin/mysql -h#{@mysqld_master_host} -P#{@mysqld_master_port} -u#{@mysqld_master_user}  -p#{@mysqld_master_pass}")
  if $? != 0
    raise "Can't connect mysql master: #{@mysqld_master_host}:#{@mysqld_master_port}"
  end

  system("echo 'FLUSH TABLES WITH READ LOCK;' | /usr/bin/mysql -h#{@mysqld_master_host} -P#{@mysqld_master_port} -u#{@mysqld_master_user}  -p#{@mysqld_master_pass} -s")
  master_status = `echo show master status | /usr/bin/mysql -h#{@mysqld_master_host} -P#{@mysqld_master_port} -u#{@mysqld_master_user}  -p#{@mysqld_master_pass} -s`.to_s.split(/\t/)[0..1]
#        p master_status

  # mysql/data/master.info
  master_infos = []
  master_infos << 14
  master_infos << master_status[0]
  master_infos << master_status[1]
  master_infos << @mysqld_master_host
  master_infos << @mysqld_master_user
  master_infos << @mysqld_master_pass
  master_infos << @mysqld_master_port
  master_infos << 60
  master_infos << 0
  master_infos << ""
  master_infos << ""
  master_infos << ""
  master_infos << ""
  master_infos << ""
  master_infos << ""

  tmp_output_basedir = File.expand_path(Wakame.gen_id, "/tmp")
  FileUtils.mkdir_p tmp_output_basedir
  master_info = File.expand_path('master.info', tmp_output_basedir)
  file = File.new(master_info, "w")
  file.puts(master_infos.join("\n"))
  file.chmod(0664)
  file.close

  3.times do |i|
    system("/bin/sync")
    sleep 1.0
  end

  Wakame.log.debug("scp -i #{Wakame.config.ssh_private_key} -o \"UserKnownHostsFile #{Wakame.config.ssh_known_hosts}\" #{master_info} root@#{@mysqld_master_host}:#{@mysqld_master_datadir}/" )
  system("scp -i #{Wakame.config.ssh_private_key} -o \"UserKnownHostsFile #{Wakame.config.ssh_known_hosts}\" #{master_info} root@#{@mysqld_master_host}:#{@mysqld_master_datadir}/" )
  Wakame.log.debug("ssh -i #{Wakame.config.ssh_private_key} -o \"UserKnownHostsFile #{Wakame.config.ssh_known_hosts}\" root@#{@mysqld_master_host} chown mysql:mysql #{@mysqld_master_datadir}/master.info" )
  system("ssh -i #{Wakame.config.ssh_private_key} -o \"UserKnownHostsFile #{Wakame.config.ssh_known_hosts}\" root@#{@mysqld_master_host} chown mysql:mysql #{@mysqld_master_datadir}/master.info" )

  3.times do |i|
    system("/bin/sync")
    sleep 1.0
  end

  FileUtils.rm_rf tmp_output_basedir

  # 2. snapshot
  Wakame.log.debug("create_snapshot (#{@ebs_volume})")
  snapshot_map = vm_manipulator.create_snapshot(@ebs_volume)
  16.times do |i|
    Wakame.log.debug("describe_snapshot(#{snapshot_map.snapshotId}) ... #{i}")
    snapshot_map = vm_manipulator.describe_snapshot(snapshot_map["snapshotId"])
    if snapshot_map["status"] == "completed"
      break
    end
    sleep 1.0
  end
  if snapshot_map["status"] != "completed"
    raise "#{snapshot_map.snapshotId} status is #{snapshot_map.status}"
  end

  # 3. unlock mysql-master
  system("echo 'UNLOCK TABLES;' | /usr/bin/mysql -h#{@mysqld_master_host} -P#{@mysqld_master_port} -u#{@mysqld_master_user}  -p#{@mysqld_master_pass}")

  # create volume /dev/xxxx
  Wakame.log.debug("create_volume_from_snapshot(#{volume_map.availabilityZone}, #{snapshot_map.snapshotId})")
  created_volume_from_snapshot_map = vm_manipulator.create_volume_from_snapshot(volume_map["availabilityZone"], snapshot_map["snapshotId"])
  volume_from_snapshot_map = created_volume_from_snapshot_map
  16.times do |i|
    Wakame.log.debug("describe_snapshot(#{snapshot_map.snapshotId}) ... #{i}")
    volume_from_snapshot_map = vm_manipulator.describe_snapshot(snapshot_map["snapshotId"])
    if volume_from_snapshot_map["status"] == "completed"
      break
    end
    sleep 1.0
  end
  if volume_from_snapshot_map["status"] != "completed"
    raise "#{volume_from_snapshot_map.snapshotId} status is #{volume_from_snapshot_map.status}"
  end

  # attach volume
  attach_volume_map = vm_manipulator.attach_volume(svc.agent.agent_id, created_volume_from_snapshot_map["volumeId"], @ebs_device)
  16.times do |i|
    Wakame.log.debug("describe_volume(#{attach_volume_map.volumeId}) ... #{i}")
    attach_volume_map = vm_manipulator.describe_volume(created_volume_from_snapshot_map["volumeId"])
    if attach_volume_map["status"] == "in-use"
      break
    end
    sleep 1.0
  end
  if attach_volume_map["status"] != "in-use"
    raise "#{attach_volume_map.volumeId} status is #{attach_volume_map.status}"
  end
end

#check ⇒ Object 



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# File 'lib/wakame/service.rb', line 902

def check
  system("/usr/bin/mysqladmin --defaults-file=/home/wakame/config/mysql-slave/my-slave.cnf ping > /dev/null")
  return false if $? != 0
  true
end

#start ⇒ Object 



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# File 'lib/wakame/service.rb', line 893

def start
  mount_point_dev=`df "#{@mysqld_datadir}" | awk 'NR==2 {print $1}'`
  if mount_point_dev != @ebs_device
    Wakame.log.debug("Mounting EBS volume: #{@ebs_device} as #{@mysqld_datadir} (with option: #{@ebs_mount_option})")
    system("/bin/mount -o #{@ebs_mount_option} #{@ebs_device} #{@mysqld_datadir}")
  end
  system(Wakame.config.root + "/config/init.d/mysql-slave start")
end

#stop ⇒ Object 



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# File 'lib/wakame/service.rb', line 908

def stop
  system(Wakame.config.root + "/config/init.d/mysql-slave stop")
end