[lxc-users] LXCFS installation effects

Tue Jun 5 19:14:10 UTC 2018

/var/lib/lxc/<NAME>/config for the container you're testing things with.

On Tue, Jun 05, 2018 at 12:09:52PM -0700, Martín Fernández wrote:
> Stéphane,
> 
> Not sure what configuration file you are talking about. Configuration file under /etc/lxc/default.conf looks like this:
> 
> ```
> lxc.network.type = veth
> lxc.network.link = br0
> lxc.network.flags = up
> lxc.network.hwaddr = XXXXX
> ```
> 
> Any lxc-* command that I could use to introspect the containers and get more information to troubleshoot ?
> 
> Thanks again!
> 
> Best,
> Martín
> 
> On Tue, Jun 05, 2018 at 4:05 PM "Stéphane Graber" < ">"Stéphane Graber" > wrote:
> 
> > 
> > 
> > 
> > What's your container's config like?
> > 
> > I wonder if it's somehow missing the include (usually indirect through
> > common.conf) that's needed for the lxcfs hook.
> > 
> > 
> > 
> > On Tue, Jun 05, 2018 at 11:57:39AM -0700, Martín Fernández wrote:
> > > Stéphane,
> > >
> > > `grep lxcfs /proc/1/mountinfo` doesn’t return any output.
> > >
> > > On the other hand,  /var/lib/lxcfs/ shows `cgroup` and `proc` folders
> > with multiple files.
> > >
> > > Best,
> > > Martín
> > >
> > > On Tue, Jun 05, 2018 at 3:54 PM "Stéphane Graber" < ">"Stéphane Graber"
> > > wrote:
> > >
> > > >
> > > >
> > > >
> > > > 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
> > > >
> > 
> > --
> > Stéphane Graber
> > Ubuntu developer
> > http://www.ubuntu.com
> >

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.linuxcontainers.org/pipermail/lxc-users/attachments/20180605/982f770d/attachment.sig>