root / snf-cyclades-app / synnefo / logic / server_attachments.py @ a1623327
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# Copyright 2011, 2012, 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and documentation are
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# those of the authors and should not be interpreted as representing official
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# policies, either expressed or implied, of GRNET S.A.
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import logging |
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from snf_django.lib.api import faults |
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from django.conf import settings |
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from synnefo.logic import backend, commands |
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log = logging.getLogger(__name__) |
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def attach_volume(vm, volume): |
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"""Attach a volume to a server.
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The volume must be in 'AVAILABLE' status in order to be attached. Also,
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number of the volumes that are attached to the server must remain less
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than 'GANETI_MAX_DISKS_PER_INSTANCE' setting. This function will send
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the corresponding job to Ganeti backend and update the status of the
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volume to 'ATTACHING'.
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"""
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# Check volume state
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if volume.status not in ["AVAILABLE", "CREATING"]: |
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raise faults.BadRequest("Cannot attach volume while volume is in" |
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" '%s' status." % volume.status)
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# Check that disk templates are the same
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if volume.disk_template != vm.flavor.disk_template:
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msg = ("Volume and server must have the same disk template. Volume has"
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" disk template '%s' while server has '%s'"
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% (volume.disk_template, vm.flavor.disk_template)) |
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raise faults.BadRequest(msg)
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# Check maximum disk per instance hard limit
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vm_volumes_num = vm.volumes.filter(deleted=False).count()
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if vm_volumes_num == settings.GANETI_MAX_DISKS_PER_INSTANCE:
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raise faults.BadRequest("Maximum volumes per server limit reached") |
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if volume.status == "CREATING": |
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action_fields = {"disks": [("add", volume, {})]} |
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else:
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action_fields = {} |
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comm = commands.server_command("ATTACH_VOLUME",
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action_fields=action_fields) |
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return comm(_attach_volume)(vm, volume)
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def _attach_volume(vm, volume): |
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"""Attach a Volume to a VM and update the Volume's status."""
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jobid = backend.attach_volume(vm, volume) |
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log.info("Attached volume '%s' to server '%s'. JobID: '%s'", volume.id,
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volume.machine_id, jobid) |
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volume.backendjobid = jobid |
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volume.machine = vm |
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if volume.status == "AVAILALBE": |
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volume.status = "ATTACHING"
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else:
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volume.status = "CREATING"
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volume.save() |
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return jobid
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def detach_volume(vm, volume): |
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"""Detach a Volume from a VM
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The volume must be in 'IN_USE' status in order to be detached. Also,
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the root volume of the instance (index=0) can not be detached. This
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function will send the corresponding job to Ganeti backend and update the
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status of the volume to 'DETACHING'.
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"""
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_check_attachment(vm, volume) |
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if volume.status not in ["IN_USE", "ERROR"]: |
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raise faults.BadRequest("Cannot detach volume while volume is in" |
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" '%s' status." % volume.status)
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if volume.index == 0: |
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raise faults.BadRequest("Cannot detach the root volume of a server") |
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action_fields = {"disks": [("remove", volume, {})]} |
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comm = commands.server_command("DETACH_VOLUME",
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action_fields=action_fields) |
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return comm(_detach_volume)(vm, volume)
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def _detach_volume(vm, volume): |
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"""Detach a Volume from a VM and update the Volume's status"""
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jobid = backend.detach_volume(vm, volume) |
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log.info("Detached volume '%s' from server '%s'. JobID: '%s'", volume.id,
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volume.machine_id, jobid) |
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volume.backendjobid = jobid |
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if volume.delete_on_termination:
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volume.status = "DELETING"
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else:
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volume.status = "DETACHING"
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volume.save() |
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return jobid
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def _check_attachment(vm, volume): |
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"""Check that the Volume is attached to the VM"""
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if volume.machine_id != vm.id:
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raise faults.BadRequest("Volume '%s' is not attached to server '%s'" |
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% volume.id, vm.id) |