> > Subject: Re: Troubleshooting boot problems > From: Florian Diesch <die...@spamfence.net> > Date: Wed, 21 Apr 2010 12:18:40 +0200 > > Any event can be emitted by any program using upstart's DBus API. > > IMHO it's not that important to know where a event gets emitted > (that's an implementation detail) but what it actually > means. >
I'm not sure I agree with this. I understand that an event driven system isn't linear (see previous discussion thread) but some services do have linear dependencies; i.e. there are some services which can only be started after others (yes, I realize this is an event dependency -- it's still a linear relationship). The example I provided should be adequate: most iptables scripts start by flushing the tables. If I have a custom table I need/want to have, it's important to me to know if ufw is running before or after my script, since I don't want my iptables rules to be flushed when the system is fully booted. The question: does ufw run before or after the rc2.d scripts? is a question about a linear ordering, and an administrator should be able to determine this what looking at source code or jumping through a bunch of hoops. Perhaps a program like pstree, but for events, would be useful? Speculation about how to suspend a service is all well and good (commenting out the start line seems logical) but there should be an *official* way to do this to avoid problems down the road. -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
