Open Stack

On Jul 13, 2013, at 8:28 AM, Sean Dague <sean at dague.net> wrote:

> Like I said, as long as someone is going to work on it, I'm happy. :) I just don't want this to be an enable the tests and hope magically fairies come to fix them issue. That's what we did on full neutron tests, and it's been bouncing around like that for a while.
> 
> We are planning on disabling the devstack exercises, it wasn't so much that, it's that it looks like there is fundamental lack of functioning nova on devstack for cells right now. The security groups stack trace is just a side effect of cells falling over in a really low level way (this is what's before and after the trace).
> 
> 2013-07-13 00:12:18.605 ERROR nova.cells.scheduler [req-dcbb868c-98a7-4d65-94b3-e1234c50e623 demo demo] Couldn't communicate with cell 'child'
> ....
> 2013-07-13 00:12:18.606 ERROR nova.cells.scheduler [req-dcbb868c-98a7-4d65-94b3-e1234c50e623 demo demo] Couldn't communicate with any cells
> 

Did you dig these out manually somehow?   It looks like that unfortunately there's no screen-n-cells.txt saved in the gate, which would be extremely useful. :)  It looks like all errors must be limited to that service right now… makes me wonder if the devstack needs tweaked now for cells.

In fact, I *might* know the problem.   Some cells config options were deprecated, and it appears that backwards compatibility was lost.  I ran into this myself, and I took a stab at fixing it (I was unable to reproduce it in tests, but it certainly showed up in one of our environments).

We should probably commit a fix to devstack to use the new config options no matter what:

1) Remove the usage of compute_api_class CONF option
2) Where compute_api_class was set to the ComputeCells class in the API cell, instead use this config:

[cells]
cell_type=api

3) In a child cell where you did not override compute_api_class, use this:
[cells]
cell_type=compute

Maybe someone could try committing that fix to devstack for me while I'm traveling? :)   I wonder if that'll get us a little further along...

- Chris