Joel Heenan wrote:
On Tue, 2008-08-05 at 10:44 -0400, Adrian Likins wrote:
Michael DeHaan wrote:
Joel Heenan wrote:
Hi List,
Just wondering whether func provides a mechanism for the clients
instigate communications with the server? Even just a "ping I want your
attention" would be good for my purposes.
Sorry if this was covered in the docs I didn't see it. Look at building
a monitoring app and would be good if the clients could alert the server
as to changes.
Thanks
Presently no, as the central server is daemonless. In that regard,
Func is more suited to replacing command-and-control
infrastructure than monitoring infrastructure (like collectd, etc).
There was some talk about having at least a "ping" type daemon
functionality at the overlord server though. One use case is
having the overlord server maintain a list of jobs for the minions to
ask for when they are ready (queued up) that the server
would then tell them to do when they came online. Though this starts
to feel a bit like a message bus.
Creating an overlord daemon of course does make sense, as eventually
we may want to enable XMLRPC into the overlord
from higher level management applications as well as just the
func-transmit system available now.
Hmm, further ideas on what you might like to see?
Is this something you might be interested in helping work on?
At the moment, the only minion->overlord communication is when the
minions request a cert from the certmaster. There
is an api for setting up triggers for when the minions request certs.
Now that I look, the certmaster triggers aren't documented
yet, so we need to fix that.
Whats the intended usage of the minion->overlord ping?
Adrian
The specific application in question is an app called HotWire used for
provisioning and asset management, similar to cobbler. I'm working on it
as part of my day job (although it is completely open source). The idea
of the ping is that the client say "hello I have new state information
come and collect it please".
Have a URL for this app?
The hotwire I am familiar with is: http://code.google.com/p/hotwire-shell/
I agree that opening up a full client->server communications channel
really moves func into something totally different than what it was
designed for and opens a can of worms. That said even an extremely
limited mechanism of client->server communication would fit my bill. If
I get time I would love to have a crack at coding up a small patch.
Excellent, please do!
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