Hi Anders,
This work is merged to the trunk now. Thank you. I added some error-handling
behavior in "reread", but it went in otherwise unchanged. I need to huddle with
Mike a bit to see if we need to make any changes, but hopefully we can get a new
release out with these changes as well as Siddhant's work for GSOC ("foreground
mode", and tab completion in supervisorctl).
- C
Anders Quist wrote:
> I finally got the time to finish the config reloading patch. Apart
> from add/remove, there is now:
>
> reread Reload the daemon's configuration files
> update Reload config and add/remove as necessary
> avail Display all configured processes
>
> In supervisorctl:
>
> supervisor> status
> bar RUNNING pid 14864, uptime 18:03:42
> baz RUNNING pid 23260, uptime 0:10:16
> foo RUNNING pid 14866, uptime 18:03:42
> gazonk RUNNING pid 23261, uptime 0:10:16
> supervisor> avail
> bar in use auto 999:999
> baz in use auto 999:999
> foo in use auto 999:999
> gazonk in use auto 999:999
> quux avail auto 999:999
>
> Now we add this to our conf:
>
> [group:zegroup]
> programs=baz,gazonk
>
> Then we reread conf:
>
> supervisor> reread
> baz: disappeared
> gazonk: disappeared
> quux: available
> zegroup: available
> supervisor> avail
> bar in use auto 999:999
> foo in use auto 999:999
> quux avail auto 999:999
> zegroup:baz avail auto 999:999
> zegroup:gazonk avail auto 999:999
> supervisor> status
> bar RUNNING pid 14864, uptime 18:04:18
> baz RUNNING pid 23260, uptime 0:10:52
> foo RUNNING pid 14866, uptime 18:04:18
> gazonk RUNNING pid 23261, uptime 0:10:52
>
> The magic make-it-so command:
>
> supervisor> update
> baz: stopped
> baz: removed process group
> gazonk: stopped
> gazonk: removed process group
> zegroup: added process group
> quux: added process group
> supervisor> status
> bar RUNNING pid 14864, uptime 18:04:43
> foo RUNNING pid 14866, uptime 18:04:43
> quux RUNNING pid 23561, uptime 0:00:02
> zegroup:baz RUNNING pid 23559, uptime 0:00:02
> zegroup:gazonk RUNNING pid 23560, uptime 0:00:02
> supervisor> avail
> bar in use auto 999:999
> foo in use auto 999:999
> quux in use auto 999:999
> zegroup:baz in use auto 999:999
> zegroup:gazonk in use auto 999:999
>
> Of course, I could have issed reread and used add to add e.g. only
> quux and later done update for the rest.
>
> There are various points to this implementation:
>
> * update is implemented in supervisorctl and thus not directly
> available in the RPC interface.
>
> * update does removed, changed, added, in that order. In theory, a
> process that doesn't handle being started more than once (e.g. lock
> file), may run into trouble (I think).
>
> * There are numerous variations of adding/changing/removing programs
> and programs moving into and out of groups. Thus, there may well be
> scenarios in which the above tools behaves unexpectedly.
>
> * In the current implementation, options' process_group_configs and
> supervisord's process_groups[...].config is the same object. This
> seems to be ok in this implementation, but it seems only a matter
> of time until someone is bitten by diff not reporting changes.
>
> * Add starts any services which have autostart set. However, the user
> is not told in supervisorctl, which may result in surprises.
>
> * reread is a silly name. Suggestions welcome.
> --
> Anders Qvist, Open End AB
> Tel: +46 31 7490887
>
>
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>
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