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Re: [libvirt] Using libvirt from PHP

Hi Russel,
I am stick with PHP. I need to use this also in our internal administration system which is completely in PHP. And I would like to provide the possibility for other PHP developers to do at least the basic things (if not complete language binding) in their PHP projects. And not to mention my Python skills are lower than PHP ones.

The idea with "intermediate" daemon does not sound bad to me. However it would need to be in other language than PHP or it would only solve the efficiency point of view. And I do not want to introduce other language than C. I do not think that using one connection per complete web page is a major problem. Web application can be stateful using cookies, sessions, etc. For example for calculating CPU usage I store cputime values into a session every time page is loaded and I use the session stored value for percent calculation. I am dividing tasks into PHP objects so I have object responsible for communicating with libvirt and everything else should be independent. So I am thinking about creating objects for direct virsh calls, zend extension and maybe for your daemon. However it means a lot of work to do and my time is limited :-(


Russell Haering napsal(a):

Not to advertise blatantly, but how attached are you to PHP? I'm
currently working on a Django (python) WebApp that (although its *very*
pre-release) could probably be adapted to what you're doing. If you are
interested in assisting in development you'd be welcome to, or if you
just wanted to fork off the code into your own thing you could do that
too. My system consists of a python daemon used for actual libvirt
interaction and a separate django web interface that interacts with the
daemon via AMF over https.

If you want to stick with what you have now, you could try doing
something similar with a python daemon (you really need something like
that for the sake of efficiency anyway, unless you can come up with a
better way of maintaining libvirt connections from a stateless webapp)
that your PHP frontend connects to. Or you could just steal my daemon
code, although at the moment all it really does is monitoring and (as of
yesterday) live migrations.

What I have so far: http://trac.osuosl.org/trac/virtadmin

Russell Haering
Systems Administrator
OSU Open Source Lab

Radek Hladik wrote:
    I am developing wimple web application in PHP to monitor and control
VMs using libvirt. I hope it could become simple library for doing basic
things with VMs. And I would like to ask for your opinion about
different possibilities of calling libvirt.

Option 1) I am calling virsh via exec command now (one virsh for every
libvirt command). This can be used for local libvirt but it is very
inefficient. The overhead for remote libvirt would be unbearable. I
could run one virsh per page and use it "interactively" so the overhead
gets lower.
Option 2) The other option is to create Zend extension which should be
able to call libvirt directly from C. However I've never done anything
like that so I do not know, whether it is reasonable or not.
Option 3) I could also create some "wrapper daemon" in C or other
language with libvirt binding. But I think that this is an ugly way :-)
Option 4) I could "talk" directly to the libvirt socket. But I am not
sure how the communication goes there and whether it is stable or
changes with every version. And I consider the socket to be internal
thing of libvirt...

Is there any other option I missed? And which one would you suggest?


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