Re: [ovirt-devel] qemu packaging - add the "qemu" user to a "gluster" group?

On Fri, Apr 28, 2017 at 06:48:00AM -0400, Karen Noel wrote: > > +Cole for Fedora/virt > +Jeff for for qemu upstream > > > ________________________________ > From: Sandro Bonazzola > Sent: Apr 28, 2017 5:08 AM > To: Niels de Vos; Miroslav Rezanina; Karen Noel; Doron Fediuck > Cc: devel > Subject: Re: qemu packaging - add the "qemu" user to a "gluster" group? > > > > > > > On Wed, Apr 26, 2017 at 3:36 PM, Niels de Vos <ndevos(a)redhat.com&gt; wrote: > >> > >> Hi, > >> > >> We're trying to improve the debugability of Gluster backed VMs and one > >> of the features for this is to be able to gather "statedumps". These > >> statedumps include memory allocation details and other information about > >> the Gluster client. QEMU is one of the applications that can be > >> configured to use libgfapi.so Gluster client. > >> > >> Gluster provides the /var/run/gluster/ directory and the libgfapi.so > >> library that qemu (in block/gluster.c) uses that. Would there be a > >> problem for the "qemu" packages to use add the "qemu" user to a > >> "gluster" group? I'm not sure yet how this is done for other packages > >> with their own users, but there would be a dependent installation order > >> of some kind (needs rpm triggers?). > >> > >> What is your opinion on this issue, or would you recommend an other > >> approach? > > > > > > Adding Miroslav, Karen and Doron. > > I'm not sure about how libgfapi is consumed by > > qemu-kvm(-ev/-rhev) but if its support is enable by default > > and doesn't require additional qemu-kvm sub packages to be > > enabled, I would suggest to just > > follow https://fedoraproject.org/wiki/Packaging:UsersAndGroups > > and add the qemu user to the gluster group in %pre. > > > > From oVirt point of view, I think it shouldn't affect us very > > much. On CentOS Virt SIG we'll consume whatever will come > > from qemu-kvm-rhev. Please keep in mind that in a not so distant future, gluster support in QEMU will be handled by a sub-package (something like qemu-kvm-gluster). See https://bugzilla.redhat.com/show_bug.cgi?id=1425820 (right now gluster support is enabled by default and included in the main qemu package, on all installations). Thanks. - Ademar

> > > >   > >> > >> > >> Thanks, > >> Niels > >> > >> PS: https://bugzilla.redhat.com/1445569 can be used to reply as well > >> > >> > >> From http://lists.gluster.org/pipermail/gluster-devel/2017-April/052629.html: > >> On Tue, Apr 25, 2017 at 07:53:06PM +0200, Niels de Vos wrote: > >> > Hi, > >> > > >> > Recently a new ability to trigger statedumps through the Gluster-CLI [0] > >> > has been added. This makes it possible to get statedump from > >> > applications that use gfapi. By default, statedumps are saved under > >> > /var/run/gluster/... and this directory is only writable by root. > >> > Applications that use gfapi do not require root permissions (like QEMU), > >> > and therefore fail to write the statedump :-/ > >> > > >> > One approach would be to create a "gluster" group and give the group > >> > permissions to write to /var/run/gluster/... Other 'fixes' include > >> > setting ACLs on the directory so that specified users can write there. > >> > because many daemons have a "home directory" that does not exist, it > >> > probably is not a good idea to use $HOME to store statedumps. > >> > > >> > What suggestions do others have? > >> > > >> > Thanks, > >> > Niels > >> > > >> > > >> > 0. https://github.com/gluster/glusterfs/blob/master/doc/debugging/statedump.md > >> > >> > > > > > > > > -- > > > > SANDRO BONAZZOLA > > > > ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D > > > > Red Hat EMEA > > > > TRIED. TESTED. TRUSTED. -- Ademar Reis Red Hat ^[:wq!