[lxc-users] LXCFS installation effects

[Stéphane Graber]

What do you see if you run "grep lxcfs /proc/1/mountinfo" inside the container?

And do you see the lxcfs tree at /var/lib/lxcfs/ on the host?

On Tue, Jun 05, 2018 at 11:50:51AM -0700, Martín Fernández wrote:
> Stéphane,
> 
> I just got time to do my work on lxcfs. Installed lxcfs running on a Ubuntu 14.04 box, installed version is 2.0.8. 
> 
> I restarted one of our containers and “I think” I see wrong output when running `free` for example. 
> 
> lxc-info shows 1GB of memory usage and `free` shows 24GB of memory usage which is the same as the host memory usage. Anything I could be missing ?
> 
> Short version of the process done would be:
> 
> - apt-get install lxcfs
> - sudo init 0 (in container)
> - lxc-start -n container-name -d 
> 
> Best,
> Martín
> 
> On Thu, May 31, 2018 at 12:39 AM "Stéphane Graber" < ">"Stéphane Graber" > wrote:
> 
> > 
> > 
> > 
> > On Wed, May 30, 2018 at 07:16:04PM -0700, Martín Fernández wrote:
> > > Stéphane,
> > >
> > > Thank you very much for the quick reply!
> > >
> > > What are you are saying is pretty awesome! That would make it super easy
> > to start using it. Is there any constraint in terms of what versions of
> > LXC are supported ? I can run LXCFS with LXC 1.0.10 ? 
> > 
> > 1.0.10 should be fine though we certainly don't have all that many users
> > of that release now that it's two LTS ago :)
> > 
> > In any case, it'll be safe to install LXCFS, then create a test
> > container, confirm it behaves and if it does then start restarting your
> > existing containers, if it doesn't, let us know and we'll try to figure
> > out why.
> > 
> > > In order to understand a little bit more about how LXCFS works, does
> > LXCFS hook into LXC starting process and mount /proc/* files ?
> > 
> > That's correct, LXCFS when installed will create a tree at
> > /var/lib/lxcfs those files then get bind-mounted on top of the
> > containers /proc/* files through a LXC startup hook.
> > 
> > > Thank you very much again!
> > >
> > > Best,
> > > Martín
> > >
> > > On Wed, May 30, 2018 at 10:52 PM "Stéphane Graber" < ">"Stéphane Graber"
> > > wrote:
> > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > lxc-users mailing list
> > > > lxc-users at lists.linuxcontainers.org
> > > > http://lists.linuxcontainers.org/listinfo/lxc-users
> > > >
> > > >
> > > >
> > > > On Wed, May 30, 2018 at 05:08:59PM -0700, Martín Fernández wrote:
> > > > > Hello,
> > > > >
> > > > > We are using LXC to virtualize containers in multiple of our hosts.
> > We
> > > > have been running with LXC for a while now. 
> > > > >
> > > > > We started adding monitoring tools to our systems and found the
> > known
> > > > issue that LXC containers show the host information on /proc/meminfo
> > and
> > > > /proc/cpuinfo.  
> > > > >
> > > > > I found that LXCFS solves the problems mentioned above. What would
> > be
> > > > required to setup LXCFS in my hosts ? Would I need to reboot all the
> > > > containers ? Do I need to restore my containers filesystem ? Is there
> > any
> > > > guide/documentation around it ?
> > > > >
> > > > > Thanks before hand!
> > > > >
> > > > > Best,
> > > > > Martín
> > > >
> > > > Hey there,
> > > >
> > > > You should just need to install lxcfs and then any container you start
> > 
> > > > or restart will be using it. There's no way to set it up against a
> > > > running container, but there's also no need to restart all your
> > > > containers immediately, you can slowly roll it out if that helps.
> > > >
> > > > And no changes needed to the containers, it gets setup automatically
> > > > through a lxc hook when the container starts.
> > > >
> > > >
> > > > --
> > > > Stéphane Graber
> > > > Ubuntu developer
> > > > http://www.ubuntu.com
> > > >
> > > >
> > > >
> > 
> > --
> > Stéphane Graber
> > Ubuntu developer
> > http://www.ubuntu.com
> > 
> > 
> >

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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