On Dec 4, 2007 6:10 PM, David Powell <David.Powell at sun.com> wrote:
> Nicolas Williams wrote: > > On Mon, Dec 03, 2007 at 12:34:28AM -0500, Brian Gupta wrote: > >> How does SMF know how to restart mysql if I manually kill the mysql > >> process(es) using "kill"? (It seems that the manifest doesn't indicate > a > >> restart.) > >> > >> This is probably just a hole in my understanding of SMF. > > > > SMF uses a new feature of Solaris called "process contracts" that is a > > sort of process group, with the crucial feature that the contract > holder > > can receive notification of events like "no more processes remain in > the > > contract" and "a process in this contract dumped core." > > > > So when svc.startd starts your daemon it starts it in a new process > > contract, and when that contract runs out of processes then svc.startd > > will restart that service (unless it's no longer enabled, has had too > > many restarts, or the start method exited with an error). > > Additionally, the kernel differentiates fatal signals that come from > processes in a contract from those that come from outside the > contract. Unless you specify otherwise (by setting startd/ignore_error > [1]), killing just a single a process in a service will cause SMF to > restart the entire service. > > Dave > > [1] See svc.startd(1M) > David, Based on your subsequent email that states that "restart" is an invalid method, what "method" does SMF use to do a complete restart, when it detects one of the processes is down? Nick, Thanks the info... that brings up some old memories from when I first experienced, and read about S10. -- - Brian Gupta http://opensolaris.org/os/project/nycosug/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/smf-discuss/attachments/20071204/89766d16/attachment.html>
