[libvirt] [PATCH] 0/8 logging infrastructure for libvirt[d]

[Dave Allan]

Daniel P. Berrange wrote:
> On Wed, Dec 17, 2008 at 04:06:38PM +0100, Daniel Veillard wrote:
>>   In practice
>>    export LIBVIRT_DEBUG=1
>>    export LIBVIRT_LOG_OUTPUTS="0:file:virsh.log"
>> and then running virsh will accumulate all logging to the virsh.log
>> file in the current directory.
> 
> This looks great. 
> 
>>   One thing which I feel is somewhat incomplete is that it's impossible
>> to remotely get debugging output from the libvirt daemon serving the
>> requests. Currently all logs are also accumulated in a cyclic logging
>> buffer, I would associate a dump function later to be hooked for example
>> to a signal handler in the daemon. But I'm unsure we should allow
>> dumping logging information to the remote end, probably not the whole
>> set.
> 
> I've been wondering whether we should create an explicit tool for
> admin of the libvirtd daemon itself. Basically something for querying
> state, and performing operations wrt to the daemon for things outside
> the scope of the libvirt API. For example, something to get details of
> active client connections, and forceably drop a client. Being able to
> have an API to configure the log level / setup of the dameon would be
> a useful thing. We can easily layer this kind of thing in as another
> RPC protocol in parallel with the existing protocol, and have simple
> CLI tool libvirtd-admin.  SQUID has a 'squidclient' tool and a CGI
> script for administration of the server itself.
> 
> Daniel

I think a daemon control interface is a great idea.  Being able to 
change things like loglevel without restarting the daemon is a real plus 
for administrators.

Dave