Hello Michael, 1. Perhaps I'm misunderstanding, but can Ceph present a SCSI interface? I don't understand how that would help with reducing the size of the rbd.
4. Heh. Tell Me about it [3]. But based on that experience, it *seemed* like I could read ok on the different nodes where the rbd was mounted. Guess there's only one way to find out. Thanks for your feedback! Best Regards, Jon A [3] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-May/001913.html On Sun, Oct 20, 2013 at 10:26 PM, Michael Lowe <j.michael.l...@gmail.com>wrote: > 1. How about enabling trim/discard support in virtio-SCSI and using > fstrim? That might work for you. > > 4. Well you can mount them rw in multiple vm's with predictably bad > results, so I don't see any reason why you could not specify ro as a mount > option and do ok. > > Sent from my iPad > > On Oct 21, 2013, at 12:09 AM, Jon <three1...@gmail.com> wrote: > > Hello, > > Are there any current Perl modules for Ceph? I found a thread [1] from > 2011 with a version of Ceph::RADOS, but it only has functions to deal with > pools, and the ->list_pools function causes a seg. fault. > > I'm interested in controlling Ceph via script / application and I was > wondering [hoping] if anyone else had a current module before I go > reinventing the wheel. (My wheel would likely leverage calls to system() > and use the rbd/rados/ceph functions directly initially... I'm not > proficient with C/XS) > > I've been primarily using OpenNebula, though I've evaluated OpenStack, > CloudStack, and even Eucalyptus and they all seem to meet ($x-1)/$x > criteria (one project seems to do one thing better than another, but they > all are missing one feature that another project has--this is a > generalization, but this isn't the OpenNebula mailing list). What I'm > looking to do at the moment is simplify my lab deployments. My current > workflow only takes 10 minutes or so to deploy a new vm: > > 1) dump xml of existing vm (usually the "base" vm that the template was > created from, I actually have a "template" that I just copy and modify now) > 2) clone rbd to new vm (usually using vmname) > 3) edit vm template to relflect new values > -- change name of vm to the new vmname > -- remove specific identifiers (MAC, etc. unnecessary when copying > "template") > -- update disk to reflect new rbd > 4) login to console and "pre-provision" vm > -- update system > -- assign hostname > -- generate ssh-keys (I remove the sshd host keys when "sysprepping" for > cloning, ubuntu I know for sure doesn't regenerate the keys on boot, I > _THINK_ RHEL might) > > I actually already did this work on automating deployments[2], but that > was back when I was primarily using qcow2 images. It leverages guestfish > to do all of the vm :management" (setting IP, hostname, generating ssh host > keys, etc). But now I want to leverage my Ceph cluster for images. > > Couple of tangentially related questions that I don't think warrant a > whole thread: > > 1) Is it possible to zero and compress rbds? (I like to use virt-sysprep > and virt-sparcify to prepare my images, then, when I was using qcow images, > I would compress them before cloning) > 2) has anyone used virt-sysprep|virt-sparcify against rbd images? I > suppose if I'm creating a template image, I could create the qcow image > then convert it to an rbd, but qcow-img creates format 1 images. > 3) anyone know of a way to create format 2 images with qemu-img? When I > specify -O rbd qemu-img seg faults, and rbd2 is an invalid format. > 4) Is it possible to mount an RBD to multiple vms as readonly? I'm > thinking like readonly iso images converted to rbds? (is it even possible > to convert an iso to an image?) > > > Thanks for your help. > > Best Regards, > Jon A > > [1] http://www.spinics.net/lists/ceph-devel/msg04147.html > [2] https://github.com/three18ti/PrepVM-App > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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