Proposed 1.0 semantics specification
Scott James Remnant
scott at netsplit.com
Wed Jun 17 20:13:52 BST 2009
On Wed, 2009-06-17 at 09:53 -0700, Daniel L. Miller wrote:
> Scott James Remnant wrote:
> >> There as probably much more required methods "on_start on_event
> >> on_starting on_failed_dependency ..."
> > "Failed dependency" is an interesting one; Upstart doesn't really
> > process jobs in that way - a job simply stays dormant all the time its
> > while condition isn't satisfied.
> > The only time you'd get a "failed to start due to a while condition" is
> > if, as a sysadmin, you ran "start JOB" manually -- this is communicated
> > back as an error to the start command, other jobs on the system don't
> > need to know about it.
> Perhaps I'm missing something (probably). I'm basing the following on
> the assumption that jobs like "starting the mailserver", which happen
> "upon startup after networking initialized" magically happen by Upstart
> parsing the configs.
> As a syadmin, if a machine is rebooted, and various processes that are
> supposed to startup DON'T - that's important information! My particular
> example is a bad one - cuz without mail services or networking its kind
> of hard to e-mail the sysadmin - but do you follow where I'm going?
Yes, I do follow.
This kind of "boot essential" job has been speculated for a while, but
no design for it has come forwards.
Upstart's design does inherently mean that services may simply not be
started, and that's not considered an error condition.
Have you ever, ever felt like this?
Had strange things happen? Are you going round the twist?
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