Jeff et.al.: I am working on a feature called "autostart" in Image Warehouse. It amounts to iwhd starting with a certain default configuration, but is a bit more: it also launches services necessary to support said default, e.g. tabled. Naturally, tabled needs cld and chunkd.
An interesting question is what to do when iwhd exits. I decided not to kill what was started. So, we have a little self-contained cell of tabled, chunkd, S3, based off a certain local directory or other namespace anchor. Therefore, when iwhd restarts, it tests if the cell is still there, and uses that. It also tests if the service started successfuly, using the same method. As we see, for each service iwhd starts, it needs to verify that it's available (either before spawning it, or after). This would be done best by talking to the service. But iwhd only has S3 client, and no CLD client, so it cannot talk to cld (or chunkd). I had an idea: add an autostart feature to tabled. Tabled knows how to talk to both chunkd and cld, so it can verify that they are running. It would not be that much code. The downside is that it's clearly a special case, encoding of a policy. So I am asking how objectionable it would be (including do we want tabled -a for tests... they kinda run ok as they are). Cheers, -- Pete -- To unsubscribe from this list: send the line "unsubscribe hail-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
