[Openstack] can instances be resized?
cristi.falcas at gmail.com
Mon Sep 2 14:26:08 UTC 2013
If you don't have lvm, cloud-init will do the resize automatically.
Otherwise you will have to do it manually. This is for qcow2 disk
format (maybe others, i only did it with this.)
To change disk size, you have to change the flavor:
If you use lvm, those are the steps I performed to resize a disk from
50GB to 750GB:
- boot in linux
- delete the partition you want to resize (I did it with the root partition)
- recreate it from the exact same start point and put the end point
where you want
- pvresize PVNAME
- lvresize /path/to/lvm -l +100%FREE
- resize2fs /path/to/lvm
On Mon, Sep 2, 2013 at 4:59 PM, Bob Ball <bob.ball at citrix.com> wrote:
> https://wiki.openstack.org/wiki/HypervisorSupportMatrix suggest that this feature only works with XenServer.
>> -----Original Message-----
>> From: Mark Chaney [mailto:mail at lists.macscr.com]
>> Sent: 02 September 2013 14:56
>> To: Bob Ball
>> Cc: openstack at lists.openstack.org
>> Subject: RE: [Openstack] can instances be resized?
>> Ok, there seems to be a lot of conflicting information out there. Some
>> people are saying its possible, some people are saying the kvm gets
>> destroyed first and pretty much created from scratch, and others are
>> saying its possible with xenserver. FYI, I will be using KVM.
>> Without any crazy workarounds or custom templates, can Openstack resize
>> kvm linux guests and keep data in tack? This is something I have to do
>> quite often with my xen (xen.org) cluster that is managed with cloudmin,
>> so its a very important feature to me that I can continue to be able to
>> do it when switching to kvm/openstack.
>> Thanks everyone for your time!
>> On 2013-09-02 03:31, Bob Ball wrote:
>> > Hi Mark,
>> > Just to add to this - if you use XenServer as the underlying
>> > hypervisor then yes, it can perform automatic resize of the partitions
>> > when you resize an instance between two flavors.
>> > I believe you need to set auto_disk_config=True for the instance - at
>> > which point the expectation is that you have a single partition and
>> > are using EXT3 or EXT4. See
>> s.py#L798 for the technical details.
>> > This occurs when you issue the nova command to resize an instance
>> > between the flavors and requires you to be running XenServer with the
>> > EXT3 SR type - see
>> > http://docs.openstack.org/trunk/openstack-
>> compute/admin/content/introduction-to-xen.html for more details on
>> setting up XenServer.
>> > Thanks,
>> > Bob
>> >> -----Original Message-----
>> >> From: Mark Chaney [mailto:mail at lists.macscr.com]
>> >> Sent: 30 August 2013 07:15
>> >> To: openstack at lists.openstack.org
>> >> Subject: [Openstack] can instances be resized?
>> >> I am going to be hosting mainly Ubuntu, CentOS, and some Debian
>> >> instances with my openstack "cloud". Can instances be resized when it
>> >> comes to their storage? Obviously not only does its disk need to be
>> >> resized, but its FS as well. I am hoping openstack can take care of
>> >> all
>> >> of that.
>> >> Thanks,
>> >> Mark
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