On Fri, Jul 29, 2016 at 9:55 AM, Josh Durgin <jdurgin@xxxxxxxxxx> wrote: > On 07/29/2016 09:40 AM, Ken Dreyer wrote: >> >> daemon-helper predates a lot of things in Ceph, and the further we go >> into systemd-land with things like unprivilged daemons, SELinux, and >> cgroups, the further Teuthology diverges from what our users do. To >> remedy this, I want to retire daemon-helper and have Teuthology tests >> use the normal init system, particularly now that our main supported >> distros are unified around systemd. If we just have to worry about systemd it would be much simpler compared to supporting various previous initd systems(14.04/7.0 etc). changes can affect only jewel+ branches. >> >> From what I understand, we use daemon-helper in Teuthology to: >> >> 1) start a daemon and eventually stop it with either SIGTERM or >> SIGKILL, depending on whether the Teuthology task has enabled the >> coverage or valgrind options, I still see some challenges here, some of the code in ceph_manager.py does pretty fast killing and revive of osd's, I think that would be possible with systemd and also generally KILL of process wont work since systemd will end up restart the process based on its config, So those cases have to be rewritten. >> >> 2) send data via STDIN >> >> 3) print some messages when the child crashes >> >> I think we could run the services using the systemd unit files and >> still accomplish #1 and #3. >> >> For #2 (communicating to the daemons via STDIN), how could we >> accomplish this? What sort of things are we writing to the daemons' >> STDIN? I'm having trouble finding examples in ceph-qa-suite.git. > > > We're not using it to write data to the daemons, but as a way to kill them > automatically if our ssh connection dies. > > With fast reimaging in the works, this will be irrelevant. Even now, > it's not really useful for the usual scheduled jobs where the nodes are > rebooted on failure. So I wouldn't worry about (2). > > Josh > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
