Requests for FC4
Stuart Children
stuart at terminus.co.uk
Thu Nov 18 14:26:33 UTC 2004
Hiya
Bill Nottingham wrote:
> Stuart Children (stuart at terminus.co.uk) said:
>
>>>Exactly... what needs to be done here is tagging of all the
>>>scripts/services
>>>that can be shut down cleanly, then some quick changes to /etc/rc should
>>>cut about half the time out of shutdown (based on some tests I ran ~10
>>>months ago or so.)
>>
>>How about a "prepare-for-system-shutdown" [1] command to the rc scripts?
>>With the meaning of "save anything you need to 'cos the system's going
>>down shortly" rather than "i want you to exit all your processes right
>>now" (the 'stop' command). For most services this could just be a NOP.
>>Others could trivially call their 'stop' command, or do whatever subset
>>of that is necessary.
>>
>>[1] a more succient name should obviously be used. :) Actually, how
>>about 'save', and 'stop' could in general call that and then do its
>>killings?
>
>
> Breaks compatibility with third-party scripts.
How do you mean... you're only adding new functionality. Is the problem
that third-party scripts wouldn't have a 'save' command? If so then you
check the exit value of the script, and if it's 1 then retry with
'stop'. Again, you start to lose some of the time savings then, but this
should not be the common case, and would improve as people updated their
scripts.
Obviously if this were implemented it would make sense to get upstream
init scripts to adopt the new command. I'm sure other distributions
would appreciate it too.
Anyway - whether this is used or another method - I think it's important
that the application/package can say "I do [not] need do to anything
before system-shutdown", rather than having a list somewhere of what
things we think are safe to skip shutdown on that is 1) potentially
obscured and 2) requires being kept up to date. Having services called
"httpd" doesn't help avoid problems here either - perhaps apache can be
safely left running, but my database-based webserver needs to write
stuff to disk... but that's another rant. :)
Cheers
--
Stuart Children
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