[Libvir] [PATCH] lxc: start domain
veillard at redhat.com
Fri Mar 28 08:07:30 UTC 2008
On Thu, Mar 27, 2008 at 02:50:20PM -0700, Dave Leskovec wrote:
> Daniel Veillard wrote:
> >> + int execStringLen = strlen(vmDef->init) + 1 + 5;
> >> + strcpy(execString, "exec ");
> >> + strcat(execString, vmDef->init);
> > Hum, it seems there is an off by one allocation error, you don't allocate
> > the space for the terminating 0
> A comment probably would have helped here :-) the + 1 up there in setting the
> execStringLen is for the NULL.
Oops, for some reason I counted 5 for 'exec', ahum :-)
> >> + vm->def->id = vm->pid;
> >> + lxcSaveConfig(NULL, driver, vm, vm->def);
> > We should make sure at some point taht there is some kind of locking
> > mechanism when creating those config files, no ?
> Good question. Right now libvirtd should be the only process accessing the
> file. Is it multi-threaded that would cause collisions? The other possibility
> is if we found we needed to save the config file from within the container.
> That's not currently the case and I'd stay away from that if at all possible.
Okay, then that's not needed, fine by me :-)
> > [...]
> > Hum, now that config names are saved based on domain names, wouldn't
> > it be better to use a name based lookup ? Less precise but more direct
> Not sure what you're referring to here. name based lookup for what?
Hum, wrong part quoted, it's about lxcDomainStart() just below:
:+static int lxcDomainStart(virDomainPtr dom)
:+ int rc = -1;
:+ virConnectPtr conn = dom->conn;
:+ lxc_driver_t *driver = (lxc_driver_t *)(conn->privateData);
:+ lxc_vm_t *vm = lxcFindVMByUUID(driver, dom->uuid);
> > Looks fine overall. I wonder if 1 fork/clone per container can't be
> > reduced to a single process doing the fd processing for all the containers
> > running. But that's probably harder, more fragile and for little gain.
> Yes, that's been tossed around. I'm holding off pursuing that for now until
> devpts namespace and it's impacts are known.
Okay, just wondering :-)
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Daniel Veillard | virtualization library http://libvirt.org/
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