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[Libvir] [Q]Will virConnectNumOfNetworks and virConnectNumOfDefinedNetworks be supported by Xen ?
by S.Sakamoto 06 Jul '07

06 Jul '07

Hi, When I use virt-manager that is connected by xen, the following error is given at every monitoring. libvir: Error : this function is not supported by the hypervisor: virConnectNumOfNetworks libvir: Error : this function is not supported by the hypervisor: virConnectNumOfDefinedNetworks Therefore I have a question. Will virConnectNumOfNetworks and virConnectNumOfDefinedNetworks be supported by Xen ? When is it if supported ? Thanks, Shigeki Sakamoto.

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Re: [Libvir] [RFC]OpenVZ XML def
by Richard W.M. Jones 05 Jul '07

05 Jul '07

Shuveb Hussain wrote: [...] OK, but still let us know if there are particular things which are a problem to parse. Also if you can just follow-up sometime with example output from OpenVZ commands. I'd like to see that, since I tried to get OpenVZ working on my machine, but it broke down (unrelated to OpenVZ :-) Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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Re: [Libvir] [RFC]OpenVZ XML def
by Richard W.M. Jones 05 Jul '07

05 Jul '07

Shuveb Hussain wrote: >> >> Daemon though? Can't the libvirt code just invoke the OpenVZ commands >> directly? > > Yeah, that is very much possible. But if it were a daemon, it could be > a Python daemon, since text processing is much simpler and I don't > have to use the str*( ) funcs in C. What is your comment? I'm a big advocate of using a sane language instead of C, but libvirt is written in C for better or worse. The problem with a separate daemon is management of that daemon. Something needs to start it and stop it, it needs to have sockets with the right permissions and so on. What happens if the process runs and can't find the daemon? What is the path to the socket? etc. etc. At the moment we have two daemons - the qemu daemon (which has two separate functions intertwined), and a remote daemon (necessary, because there's no other way to communicate to a remote machine). One idea would be to have the Python code fork off from the main program and communicate over a pipe. With this, there is no daemon management problem. +----------------+ | Program | | - - - - - - - -| | libvirt | +----------------+ | | fork(2) and pipe(2) | +-------------+ | Python code | +-------------+ But I'm not the person who ultimately decides what would be acceptable in libvirt. You'd need to get general agreement on the best way to do this. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] virDomainLookup* functions raise VIR_ERR_NO_DOMAIN if the domain doesn't exist
by Richard W.M. Jones 04 Jul '07

04 Jul '07

The patches that I'm going to follow up with change virDomainLookup* functions so that they raise VIR_ERR_NO_DOMAIN where a domain doesn't exist (but there is no other error), else raise some other error where there's an actual error occuring. This will allow wrappers in other languages to distinguish the three cases found / not found / error. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] Fix xm_internal configCache
by Richard W.M. Jones 04 Jul '07

04 Jul '07

This patch: (1) Fixes inactive domains over remote. The real cause of this error turned out to be that after configCache hash is created, the last refresh date wasn't reset, so a subsequent call to xenXMConfigCacheRefresh might not actually repopulate the cache. This only affects the remote case, because only in the remote case do we have a long running process (libvirtd) which closes and reopens xm_internal.c, so this code had never been exercised before. It also explains why the bug was annoyingly intermittent. If you wait >= 10 seconds during testing, then the cache does get refilled, so the bug is hidden. (2) Adds error messages to xenXMConfigCacheRefresh. (3) As Daniel Veillard suggested, change the obscure !nconnections-- condition to two explicit statements. (4) In xenXMOpen, change the condition from nconnections == 0 to configCache == NULL, to remove the implicit dependency between the two variables. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] xend 404 errors return VIR_ERR_NO_DOMAIN
by Richard W.M. Jones 04 Jul '07

04 Jul '07

(1) Check for 404 errors from xend and turn them into VIR_ERR_NO_DOMAIN (currently they are VIR_ERR_POST_FAILED). You'll typically see this when you have a handle to a domain, but the underlying domain is shutdown, as in this example: $ python Python 2.4.3 (#1, Dec 11 2006, 11:39:03) [GCC 4.1.1 20061130 (Red Hat 4.1.1-43)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import libvirt >>> conn = libvirt.open ("xen+tls:///") >>> dom = conn.lookupByName ("fc6_6") >>> dom.suspend () 0 >>> dom.resume () 0 #### here, I shut down the domain using 'xm' >>> dom.suspend () libvir: Xen Daemon error : Domain not found: No such domain fc6_6 Traceback (most recent call last): File "<stdin>", line 1, in ? File "/home/rjones/local/lib/python2.4/site-packages/libvirt.py", line 359, in suspend if ret == -1: raise libvirtError ('virDomainSuspend() failed', dom=self) libvirt.libvirtError: virDomainSuspend() failed Domain not found: No such domain fc6_6 (2) There was a case where xend was returning an error, but we didn't translate that into an error return code (-1). I'm sure this is an oversight, and the patch fixes it. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] Fix callers to virGetDomain and virGetNetwork
by Richard W.M. Jones 04 Jul '07

04 Jul '07

(1) Removes virGetDomainByID. This function was neither used nor exported. (2) virGetDomain sets a virterror connection error whenever anything bad happens (realistically malloc failure is the only thing that can go wrong). Therefore callers do not need to set virterror if the function returns NULL. The patch fixes these callers. (3) Same as (2), for virGetNetwork. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] Proposal: Python bindings should turn NO_DOMAIN/NO_NETWORK errors in KeyError exceptions
by Richard W.M. Jones 04 Jul '07

04 Jul '07

I propose that we should change the Python bindings so that when the virterror errors VIR_ERR_NO_DOMAIN and VIR_ERR_NO_NETWORK occur in the lookup* functions only, should cause KeyError to be raised. According to: http://docs.python.org/lib/module-exceptions.html "[KeyError is] raised when a mapping (dictionary) key is not found in the set of existing keys." I've already changed the OCaml bindings so that these errors get converted into Not_found exception, which is the "natural" exception for when something is looked up and not found. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] virNetworkLookup* functions should raise VIR_ERR_NO_NETWORK
by Richard W.M. Jones 04 Jul '07

04 Jul '07

This small patch changes the virNetworkLookup* functions so that they raise VIR_ERR_NO_NETWORK in the case where the network cannot be found (as opposed to some other error). It requires the VIR_ERR_NO_DOMAIN patches (see previous thread) to be applied first, or at least patch #1 from that series. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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[Libvir] [PATCH] Readd buffer errors & some cleanups
by Richard W.M. Jones 04 Jul '07

04 Jul '07

This readds some error checking of the returns from virBuffer* functions, removes need for is_blank (a _GNU_SOURCE extension), and a couple of other very minor cleanups. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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