[Systems] Wiki speed

Sam P. sam at sam.today
Sat Jun 27 08:08:14 EDT 2015

Hi Bernie,

On Sat, Jun 27, 2015 at 3:56 AM Bernie Innocenti <bernie at codewiz.org> wrote:

> On 26/06/15 09:14, Samuel Cantero wrote:
> I like the approach of using systemd for resource management. Besides,
> > on an operating system which uses systemd as the service manager process
> > (not only the ones inside of the container) will be placed in a cgroups
> > tree. BTW, systemd will replace upstart in Ubuntu 15.04.
> If we need to upgrade to 15.04 for systemd, I'd go for it even if it's
> not LTS. We have the ability to experiment on freedom while justice
> keeps serving production traffic.

Yeah, systemd is very useful.  I'm pretty sure it has systemd, but I'll
spin up a droplet on DO to check it very soon.  From memory, systemd got
shipped on most of the distros recently.

> When (and *if*) we're satisfied with the stability of systemd containers
> on 15.04, we'll upgrade justice to the same release. And anyway, as soon
> as the next LTS comes out we'll upgrade both machines to it, in the same
> staggered fashion which minimizes surprises.
> However, systemd-nspawn is relatively new and I haven't heard of any
> large deployment using it. It may very well be that it's not yet ready
> for production. So don't count too much on it.

Hum, I wasn't thinking of using systemd-nspawn.  It is pretty cool, but it
might not be as production ready.

I was thinking of using rkt to run containers.  It is backed by coreos so
it's probably more production ready.  But, since rkt runs in the same UNIX
style as systemd-nspawn, you can integrate it with systemd unit/.service
files [1].  This means that you have a simple management system from
systemd and also a way of allocating resources (CPUQuota and MemoryLimit)
and monitoring (try "systemctl status display-manager.service").

I was aiming to test that today, but I'm getting there very slowly.  rkt
runs appc images although you can convert docker images to appc.  I have no
idea how you build appc images and can't find the link to a registry or
anything dockery like that.  Running docker images either involves pulling
them from a docker registry or converting them (like 10minutes of pure disk
I/O).  Anyway, that's something to research.

> > I will look for rtk and runc.io <http://runc.io>.
> Thanks. Speaking of container management, have you guys tried Kubernetes?
>    https://github.com/googlecloudplatform/kubernetes
> Looks a bit too big for our infrastructure, but it also looks pretty
> well designed and implemented...

Yeah, it's a cool system.  It doesn't seem to solve out resource limits
issue - it is built on top of docker I think.

What's your use case of it?



> --
>   _ // Bernie Innocenti
>   \X/  http://codewiz.org
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