[sheepdog] [PATCH v2 1/2] sheep, dog: runtime loglevel changing

[Liu Yuan]

On Sat, Oct 19, 2013 at 11:35:33PM +0900, Hitoshi Mitake wrote:
> This patch adds two new opcode for runtime loglevel changes and let
> dog support the changing from command line. This is useful for making
> sheep process verbose temporally and can make troubleshooting easier.
> 
> Example of usage:
> 
> $ dog node loglevel list
> emerg   (0)
> alert   (1)
> crit    (2)
> err     (3)
> warning (4)
> notice  (5)
> info    (6)
> debug   (7)
> $ dog node loglevel get
> info (6)
> $ dog node loglevel set debug	# <- change loglevel from info to debug
> $ dog node loglevel get
> debug (7)

I am still not convinced of 'loglevel'. It would hard to extend, e.g, if we
want to add more commands related to 'log', like 'log filter', we have no
choice but to add 'dog node logfilter'.

So I think 'dog node log' would be a good log namespace for its subcommands.
That said,
     'node log set' # implies to set log level
     'node log get' # implies to get log level
     'node log list' # implies to list log level
     'node log filter' # operate on the content of log
looks okay to me.

Thanks
Yuan