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Re: [libvirt] [PATCH]LXC: force container to enable network namespace



On Thu, Aug 22, 2013 at 09:23:50AM +0800, Gao feng wrote:
> On 08/21/2013 05:53 PM, Daniel P. Berrange wrote:
> > On Wed, Aug 21, 2013 at 05:49:05PM +0800, Chen Hanxiao wrote:
> >> From: Chen Hanxiao <chenhanxiao cn fujitsu com>
> >>
> >> If we don't enable network namespace, we could shutdown host
> >> inside container by command 'shutdown', which is unacceptable.
> >> This patch will force users to enable network namespace
> >> before they start container.
> >>
> >> Signed-off-by: Chen Hanxiao <chenhanxiao cn fujitsu com>
> >> ---
> >>  src/lxc/lxc_container.c |    6 ++++++
> >>  1 files changed, 6 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
> >> index c7a22ab..5631ad7 100644
> >> --- a/src/lxc/lxc_container.c
> >> +++ b/src/lxc/lxc_container.c
> >> @@ -1937,6 +1937,12 @@ int lxcContainerStart(virDomainDefPtr def,
> >>      if (lxcNeedNetworkNamespace(def)) {
> >>          VIR_DEBUG("Enable network namespaces");
> >>          cflags |= CLONE_NEWNET;
> >> +    } else {
> >> +        errno = EINVAL;
> >> +
> >> +        virReportSystemError(errno, "%s",
> >> +                             _("Network namespace needed"));
> >> +        return -1;
> >>      }
> >>  
> >>      pid = clone(lxcContainerChild, stacktop, cflags, &args);
> > 
> > NACK.
> > 
> > We explicitly want to allow containers sharing the host's network
> > namespace. If you wish to prevent the problem you describe, then
> > set the <privnet/> feature in the XML, or configure virtual NICs
> > 
> 
> At least we should give user some warning message or add a notification
> about the probable reboot problem if user doesn't configure private
> net namespace for container.

That can be documented in the drvlxc.html.in page

Daniel
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