Re: Ceph on XenServer

[Ashley Merrick <ashley@xxxxxxxxxxxxxx>]

Just to give me 50 cents, Proxmox uses full KVM virt, they offer their own GUI and storage management on top of standard QEMU/KVM.

,Ashley
Sent from my iPhone

On 25 Feb 2017, at 10:12 PM, Massimiliano Cuttini <max@xxxxxxxxxxxxx> wrote:

Hi Brian,

never listen before.
However seems nice and fully featured.

The pity is that is based o KVM, which is as far as I know is a ligth hypervisor that is not able to isolate the virtual machine properly.
Due to this is possible to frozen the hypervisor kernel from a guest virtual machine allowing somebody to freeze all your VMs all in once.
Xen is completly isolated (of course not as light as KVM). You can freeze a VMs but other could not be affected in anyway.
Security should not considered an option.

Thanks anyway,
Max

Il 25/02/2017 14:02, Brian : ha scritto:

Hi Max,

Have you considered Proxmox at all? Nicely integrates with Ceph storage. I moved from Xenserver longtime ago and have no regrets.

Thanks

Brians

On Sat, Feb 25, 2017 at 12:47 PM, Massimiliano Cuttini <max@xxxxxxxxxxxxx> wrote:

Hi Iban,

you are running xen (just the software) not xenserver (ad hoc linux distribution).
Xenserver is a linux distribution based on CentOS.
You cannot recompile the kernel by your-own (... well, you can do, but it's not a good idea).
And you should not install rpm by your-own (... but, i'm gonna do this).

Then I'm stuck with some plugin and just some rpm compatible with kernel 3.10.0-514.6.1.el7.x86_64
However I found a way to install more or less the Ceph Client.

I have forked the plugin of https://github.com/rposudnevskiy/RBDSR It seems the most update.
Here you can find my findings and updates: https://github.com/phoenixweb/RBDSR
However at the moment I'm stuck with a kernel unsupported feature. :(
Let's see if I can let this work.

Thanks for your sharings
Max

Il 24/02/2017 18:46, Iban Cabrillo ha scritto:

Hi Massimiliano,

  We are running CEPH agains our openstack instance running Xen:

ii  xen-hypervisor-4.6-amd64             4.6.0-1ubuntu4.3                    amd64        Xen Hypervisor on AMD64

ii  xen-system-amd64                     4.6.0-1ubuntu4.1                    amd64        Xen System on AMD64 (meta-package)

ii  xen-utils-4.6                        4.6.0-1ubuntu4.3                    amd64        XEN administrative tools

ii  xen-utils-common                     4.6.0-1ubuntu4.3                    all          Xen administrative tools - common files

ii  xenstore-utils                       4.6.0-1ubuntu4.1                    amd64        Xenstore command line utilities for Xen

2017-02-24 15:52 GMT+01:00 Massimiliano Cuttini <max@xxxxxxxxxxxxx>:

Dear all,

even if Ceph should be officially supported by Xen since 4 years.

• http://xenserver.org/blog/entry/tech-preview-of-xenserver-libvirt-ceph.html
• https://ceph.com/geen-categorie/xenserver-support-for-rbd/

rbd is supported on libvirt 1.3.2, but It has to be recompiled the 

ii  libvirt-bin           1.3.2-0~15.10~XXXX     amd64        programs for the libvirt library

ii  libvirt0:amd64   1.3.2-0~15.10~XXXX     amd64        library for interfacing with different virtualization systems

Still there is no support yet.

At this point there are only some self-made plugin and solution around.
Here some:

• https://github.com/rposudnevskiy/RBDSR
• https://github.com/mstarikov/rbdsr
  
• https://github.com/FlorianHeigl/xen-ceph-rbd

Nobody know how much they are compatible or if they are gonna to break Xen the next update.

The ugly truth is that XEN is not still able to fully support Ceph and we can only pray that one of the plugin above will not destroy our precious data or VDI.

Does anybody had some experience with the plugin above?
Which one you'll reccomend?
Is there any good installation guide to let this work correctly?
Can I just install Ceph with ceph-deploy or do I have to unlock repos on the xenserver and instal it manuall, Thanks for any kind of support.

Attaching volumes from openstack portal (or using cinder volume manager), has been working fine since 6 months ago, but I do not know what will happen on next updates

Regards,
Max

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