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From Tim Mackey <tmac...@gmail.com>
Subject Re: [DISCUSS] XCP usage with CloudStack
Date Fri, 17 Apr 2015 22:12:57 GMT
Thanks Rafael.

I'll check to see what the maintenance status is for xcp-xapi with Debian
when I get back to the office on Monday.  I do recall there being issues
raised last summer.

One of the reasons the question I've asked is so important has to do with
CloudStack assumptions in a XenServer environment.  For example, it doesn't
directly issue xe commands, but uses both the Java and Python xapi
bindings, and has a number of supporting scripts which assume package
versions which match those of specific XenServer releases.

btw, by way of disclosure, I'm the XenServer community manager and have
acquired a pretty decent level of expertise with things Xen, XCP, XAPI and
XenServer since joining the team in 2008.  Here's a google search for me:
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=tim%20mackey%20xenserver


Oh, and I'm grinning as I write this since I suspect some colleagues will
kid me over you educating me.  No harm, and no offense.  I guess I'm not as
well known as I thought ;)

-tim



On Fri, Apr 17, 2015 at 5:21 PM, Rafael Weingartner <
rafaelweingartner@gmail.com> wrote:

> UPDATE:
> you can find more on Xenserver and XCP here:
> http://pt.slideshare.net/xen_com_mgr/xpus13-pavlicek
>
> On Fri, Apr 17, 2015 at 4:12 PM, Rafael Weingartner <
> rafaelweingartner@gmail.com> wrote:
>
> > Dear Tim Mackey,
> >
> > I have a production environment using XCP (XAPI). As far as I know, the
> > difference between the use of XAPI and Xenserver is that Xenserver is an
> OS
> > bundled altogether with a version of Xen hypervisor, XAPI and some
> > management tools. While, XAPI is just the API used to consolidate
> workloads
> > and interact with the Xen hypervisor hosts.
> >
> > At the end, Xenserver environments are using the Xen hypervisor and XAPI
> > toolstack. The difference is that it comes pre-built with an OS
> (CentOS?).
> >
> > When Cloudstack sends some command to start or stop a VM, it will send
> > something like “xe vm-start uuid=<uidVM>” or “xe vm-shutdown
> uuid=<uidVM>”,
> > these are XAPI commands. Therefore, even if you are using Xenserver
> > environments, those are the commands that are going to be used; hence,
> > Xenserver encapsulates the XAPI and Xen hypervisor.
> >
> > To my knowledge, now that Xenserver was open by Citrix, there should not
> > be any difference on capabilities between the XAPI that we get from here:
> > http://www.xenproject.org/developers/teams/xapi.html
> >
> > And the one that we get when we install the Xenserver directly.
> >
> >
> >
> > Now answering your questions:
> >
> > 1. What OS/version are you using for dom0 and with what hypervisor
> version?
> >
> > We are using Debian 7.4.0, we first tried Ubuntu server, but it was not
> > stable enough for a production environments. The Ubuntu had some bugs and
> > missing dependencies that had to be worked around.
> >
> > 2. How did you deploy XCP (from pre-compiled ISO, built from source,
> > package source i.e yum/apt-get, xenserver-core packages, something else)
> >
> > We installed the XCP (XAPI) using the apt repository.
> > We first installed the xen hypervisor:
> >
> > # apt-get install xen-hypervisor-amd64
> >
> > then the XAPI packages:
> >
> > # apt-get install xcp-xapi
> >
> > Of course, is not as simple as just running those commands, we also had
> to
> > configure the networking and tuned the xen hypervisor, XAPI, storage and
> > etc.
> >
> >
> > 3. How are you handling updates to the XCP/Xen/XAPI components,
> > particularly those of a security nature?
> >
> > If any patch is created and we find that it has to be applied in our
> > environment, we first look if it is already in apt-get repository, if it
> is
> > there, we just upgrade that package. If the upgrade is not in the
> official
> > repository, we get and apply it manually.
> >
> >
> > I am curious, what are the assumptions you make for Xenserver
> environments?
> >
> > On Fri, Apr 17, 2015 at 11:23 AM, Tim Mackey <tmackey@gmail.com> wrote:
> >
> >> A little bit ago there was a thread started on the dev list about XCP
> and
> >> CloudStack.  I've had a bit of a think about this if you're using XCP I
> >> would like to understand better how XCP, and by extension the XAPI
> >> toolstack when *not* part of XenServer, is deployed in your
> environments.
> >> If XCP/XAPI users can answer these three questions, it would help in
> >> understanding how to best handle XCP moving forward.
> >>
> >> 1. What OS/version are you using for dom0 and with what hypervisor
> >> version?
> >>
> >> 2. How did you deploy XCP (from pre-compiled ISO, built from source,
> >> package source i.e yum/apt-get, xenserver-core packages, something else)
> >>
> >> 3. How are you handling updates to the XCP/Xen/XAPI components,
> >> particularly those of a security nature?
> >>
> >> While the XAPI toolstack as part of XenServer receives significant
> >> development and QA attention, the same can't be said for legacy XCP and
> >> pure XAPI.  There are also assumptions made for XenServer which aren't
> >> always valid in a legacy XCP or general XAPI installation.  What I'm
> >> trying
> >> to figure out is if we need to address any issues, and if so what the
> >> impact might be.
> >>
> >> Thanks
> >>
> >> -tim
> >>
> >
> >
> >
> > --
> > Rafael Weingärtner
> >
>
>
>
> --
> Rafael Weingärtner
>

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