Re: [libvirt] CGROUPS network classID setting in domain

On Nov 22, 2010, at 2:21 PM, Daniel P. Berrange wrote: > On Thu, Nov 18, 2010 at 04:22:49PM +0100, D. Herrendoerfer wrote: >> Hello, >> >> I'm looking into the possibility of putting a network(tc) classID >> into >> to the domain description and adding it into a (possibly) mounted >> cgroup directory upon launch of a VM. >> >> Has anyone before looked into this ? >> I've seen this mentioned in an abstract by Daniel B. >> >> I imagine a classid entry to look somewhat like: >> >> <domain type='qemu'> >> <name > foo</name> >> <uuid>3e3fce45-4f53-4fa7-bb32-11f34168b82b </uuid> >> ... >> <classid>0x1234</classid> >> >> ... >> >> Thoughts ? > > This isn't a very nice approach to modelling network controls > for a guest. The use of 'tc' for controlling networking is > a Linux specific implementation detail, that is not at all > applicable to any other platform. A bare classid on its own > also has zero semantic value - this is akin to configuring > guest disks by using an inode number in the XML instead of > the file path. > Agreed, but .. > Any networking controls really need a higher level XML > description of the conceptual policy that is being applied > to the network traffic, that is independant of any single > implementation mechanism. Internally libvirt would create > TC classids itself per VM, and map those to cgroups. > .. I don't really want to use libvirt for a "one-shot" configuration of the network policy, but rather manage a group of classid settings and simply have the ability to classify a VM to a group. This management is specific to a host, not a single VM. Therefore it would be a great benefit if libvirt would simply set a classid for a running VM, and let the network admin tool figure out the traffic shaping. > Regards, > Daniel -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list