On Wed, 2009-05-20 at 11:57 +0530, er krishna wrote:
> >>>> What about a new dameon, if we create vbladectl which will keep
> track of all the exported device based on interface & path
> ( /dev/loop0 or eth0 ) release the attached resource or add new
> resource ? I think we can have a look for this implemenatation.
>
> Ed, does it seems valuable or funny. A patch will be welcome if I try
> for this implementation. Just suggest.
What I was going to do was add some more options to vblade, i.e. -d /
--daemon. vbladed would then become a symbolic link to vblade, and if
vblade is run as vbladed, --daemon is automatically assumed, everything
just goes to syslog.
The other change I will finish and submit is a simple ini style
configuration file, something like this:
[daemon]
loglevel = info
; %S is always expanded to shelf, %s always expands to slot
lockfile = /var/run/vblade/blade-%S-%s.pid
[/dev/volgroup/foo]
shelf = xx
slot = xx
eth = xx
directio = true / false
on_boot = true
[/home/foo/file.img]
...
...
...
I don't think a wire protocol (as vbladectl would suggest) is really
needed, all each vbladed process has to do is lock
via /var/run/vblade/{shelf}.{slot} , which would contain its process ID.
Similarly, vbladectl can just parse the configuration file.. i.e
vbladectl stop /dev/volgroup/foo
vbladectl restart /dev/volgroup/foo
vbladectl show would have the task of validating whatever is
in /var/run/vblade, and could easily correlate each export to the pid of
the blade handling it.
I wasn't going to get any more complicated than that, as that alone is
enough for anyone to write custom rc scripts / tools.
Really, in fact, all of that can be accomplished without touching vblade
itself. It just seemed a little cleaner to just modify it vs making a
bunch of wrappers to work around it.
This approach would also keep from breaking existing use of vblade /
vbladed.
Cheers,
--Tim
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