[lxc-users] Experience with large number of LXC/LXD containers

[Gaétan QUENTIN]

in a LXD container, the syntax is:

lxc config set mycontainer   raw.idmap 'both 1003 1003'

as idmap  is a blob, i you want assign multiple values, you have to send
multilines:

echo -e "both 1003 1003\nboth 1004 1004" | lxc config set mycontainer
raw.idmap -

2017-03-27 15:33 GMT+02:00 Serge E. Hallyn <serge at hallyn.com>:

> On Tue, Mar 14, 2017 at 02:29:01AM +0100, Benoit GEORGELIN - Association
> Web4all wrote:
> > ----- Mail original -----
> > > De: "Simos Xenitellis" <simos.lists at googlemail.com>
> > > À: "lxc-users" <lxc-users at lists.linuxcontainers.org>
> > > Envoyé: Lundi 13 Mars 2017 20:22:03
> > > Objet: Re: [lxc-users] Experience with large number of LXC/LXD
> containers
> >
> > > On Sun, Mar 12, 2017 at 11:28 PM, Benoit GEORGELIN - Association
> > > Web4all <benoit.georgelin at web4all.fr> wrote:
> > > > Hi lxc-users ,
> >
> > > > I would like to know if you have any experience with a large number
> of
> > > > LXC/LXD containers ?
> > > > In term of performance, stability and limitation .
> >
> > > > I'm wondering for exemple, if having 100 containers behave the same
> of
> > > > having 1.000 or 10.000 with the same configuration to avoid to talk
> about
> > > > container usage.
> >
> > > > I have been looking around for a couple of days to found any
> user/admin
> > > > feedback experience but i'm not able to find large deployments
> >
> > > > Is there any ressources limits or any maximum number that can be
> deployed on
> > > > the same node ?
> > > > Beside physical performance of the node, is there any specific
> behavior that
> > > > a large number of LXC/LXD containers can experience ? I'm not aware
> of any
> > > > test or limits that can occurs beside number of process. But I'm
> sure from
> > > > LXC/LXD side it might have some technical contraints ?
> > > > Maybe on namespace availability , or any other technical layer used
> by
> > > > LXC/LXD
> >
> > > > I will be interested to here from your experience or if you have any
> > > > links/books/story about this large deployments
> >
> >
> > > This would be interesting to hear if someone can talk publicly about
> > > their large deployment.
> >
> > > In any case, it should be possible to create, for example, 1000 web
> servers
> > > and then try to access each one and check any issues regarding the
> > > response time.
> > > Another test would be to install 1000 Wordpress installations and
> > > check again for the response time
> > > and resource usage.
> > > Such scripts to create this massive number of containers would also be
> > > helpful to replicate
> > > any issues in order to solve them.
> >
> > > Simos
> >
> >
> > Yes it's would be very nice to hear about this kind of infrastructure
> using lxc/lxd
> > I'm not yet ready to make this kind of testing, but if someone would
> like to work on this with me as a projet, I can provide the technical
> infrastructure and scripts .
> > That would be nice to provide a good testing case and analyse to share
> to the community
>
> It should be pretty simple.  I've done testing like this to test other
> software, which implicitly ended up testing lxd.
>
> You'd probably create a first container and publish it locally,
>
> (all commands untested, just an example)
>
> lxc launch ubuntu:xenial template
> lxc exec template -- apt -y install nginx
> lxc stop template
> lxc publish --alias template template
>
> Then do your testing in a loop,
>
> # spin up containers
> for i in `seq -f "%04g" 1 1000`; do
>         lxc launch template nginx-$i
> done
>
> # spin up clients
> ... etc
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-- 
Gaétan QUENTIN
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