On 5/08/2014 5:44 AM, Erwan David wrote: > Le 04/08/2014 21:34, Tom H a écrit : >> Going back to "fix sysinit instead" (which is what I was replying to), >> did anyone add cgroup support to sysvinit so someone could tell >> Lennart "f-u, sysvinit can kill double-forked children"? >> > > For me that should be the responsibility of the service itself.Not of > the init system.
I absolutely agree, shutting down any process need not involve other processes -- if I want to shutdown dovecot and restart it for whatever reason, I don't want it bringing down exim4. >> Suppose that you have a 16-node cluster, some patches were applied to >> the systems overnight, a mistake was made, and you have to correct >> this mistake on all of the systems during trading hours. Once you get >> all the OKs that are needed for this kind of emergency change, the >> head of the trading desk that uses that cluster calls you and says >> "I'm going to be on the line for as long as you're working on our >> system." So you fix one node, reboot it, make sure that it's back in >> the cluster and doing its job, and fix another, etc. You can be sure >> that everyone's happier that the systems boot quickly and that the >> cluster was running with 15 rather than 16 nodes for as few minutes as >> possible (because you can be sure that the fact that this cluster >> wasn't running at full capacity for X minutes will come up in >> managerial meetings, both in IT ones and in IT-Business ones). The argument here is likely that the upgrade should have been tested on a test cluster FIRST and perhaps extensively -- if you have that many servers in play, you should have a development, test and production environment to work with and very stringent change control methods in place. >> I don't care what's bringing up a system, >> sysvinit/systemd/smf/launchd, the faster the better. > > What takes most time when booting a server is what the server does > before booting the OS (before grub in case of linux). Optimising what > comes after is non-sense. Again, I completely agree. Many servers can take an extraordinary amount of time before it gets to grub -- from grub onwards it isn't a big deal. > Note that with systemd more upgrades will necessitate a reboot, since > systemd does many things... Yes. Cheers A.
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