Re: [Users] [vdsm] [ATTENTION] vdsm-bootstrap/host deployment (pre-3.2)

On Wed, Nov 28, 2012 at 03:29:35PM -0600, Adam Litke wrote: > On Wed, Nov 28, 2012 at 03:45:28PM -0500, Alon Bar-Lev wrote: > > > > > > ----- Original Message ----- > > > From: "Dan Kenigsberg" <danken(a)redhat.com&gt; > > > To: "Alon Bar-Lev" <alonbl(a)redhat.com&gt; > > > Cc: "VDSM Project Development" <vdsm-devel(a)lists.fedorahosted.org&gt;, "engine-devel" <engine-devel(a)ovirt.org&gt;, "users" > > > <users(a)ovirt.org&gt; > > > Sent: Wednesday, November 28, 2012 10:39:42 PM > > > Subject: Re: [vdsm] [ATTENTION] vdsm-bootstrap/host deployment (pre-3.2) > > > > > > On Wed, Nov 28, 2012 at 02:57:17PM -0500, Alon Bar-Lev wrote: > > > > > > > > > > No... we need it as compatibility with older engines... > > > > > > We keep minimum changes there for legacy, until end-of-life. > > > > > > > > > > Is there an EoL statement for oVirt-3.1? > > > > > We can make sure that oVirt-3.2's vdsm installs properly with > > > > > ovirt-3.1's vdsm-bootstrap, or even require that Engine must be > > > > > upgraded > > > > > to ovirt-3.2 before upgrading any of the hosts. Is it too harsh > > > > > to > > > > > our > > > > > vast install base? users(a)ovirt.org, please chime in! > > > > > > > > > > > > > I tried to find such, but the more I dig I find that we need to > > > > support old legacy. > > > > > > Why, exactly? Fedora gives no such guarntees (heck, I'm stuck with an > > > unupgradable F16). Should we be any better than our (currently > > > single) > > > platform? > > > > We should start and detach from specific distro procedures. > > > > > > > > > > > > > > > > > > > > > * legacy-removed: change machine width core file > > > > > > > > # echo /var/lib/vdsm/core > /proc/sys/kernel/core_pattern > > > > > > > > > > > > > > Yeah, qemu-kvm and libvirtd are much more stable than in the > > > > > > > old > > > > > > > days, > > > > > > > but wouldn't we want to keep a means to collect the corpses > > > > > > > of > > > > > > > dead > > > > > > > processes from hypervisors? It has helped us nail down nasty > > > > > > > bugs, > > > > > > > even > > > > > > > in Python. > > > > > > > > > > > > It does not mean it should be at /var/lib/vdsm ... :) > > > > > > > > > > I don't get the joke :-(. If you mind the location, we can think > > > > > of > > > > > somewhere else to put the core dumps. Would it be hard to > > > > > reinstate a > > > > > parallel feature in otopi? > > > > > > > > I usually do not make any jokes... > > > > A global system setting should not go into package specific > > > > location. > > > > Usually core dumps are off by default, I like this approach as > > > > unattended system may fast consume all disk space because of > > > > dumps. > > > > > > If a host fills up with dumps so quickly, it's a sign that it should > > > not > > > be used for production, and that someone should look into the cores. > > > (P.S. we have a logrotate rule for them in vdsm) > > > > There should be a vdsm-debug-aids (or similar) to perform such changes. > > Again, I don't think vdsm should (by default) modify any system width parameter such as this. > > But I will happy to hear more views. > > I agree with your statement above that a single package should not override a > global system setting. We should really work to remove as many of these from > vdsm as we possibly can. It will help to make vdsm a much safer/well-behaved > package. I'm fine with dropping these from vdsm, but I think they are good for ovirt - we would like to (be able to) enfornce policy on our nodes. If configuring core dumps is removed from vdsm, it should go somewhere else, or our log-collector users would miss their beloved dumps.