| codebeaker | how can I (easily) HUP to reload a process | 13:29 |
|---|---|---|
| codebeaker | everything says "initctl reload <myjob>" - but as far as I can ascertain that's simply for reloading initctl's config file for that job | 13:30 |
| codebeaker | I'm wroking with three daemons which respond to HUP by seamlessly rebooting themselves with zero-downtime | 13:30 |
| codebeaker | I don't really feel like going back to systemv init scripts, or reading pidfiles and sending HUPs - especially as that causes upstart to lose track of them when their PID changes | 13:31 |
| ion | Parse the pid from the output of initctl status job, send HUP to that. | 13:37 |
| ion | pid=; eval "$(initctl status foo | sed -nre 's|^cron start/running, process ([0-9]+)$|pid=\1;|p')" | 13:39 |
| ion | if [ -n "$pid" ]; then … | 13:40 |
| codebeaker | thanks ion, that's a bit cleaner | 14:02 |
| codebeaker | but when teh pid changes, initctl will still lose track of it, right ? | 14:02 |
| codebeaker | (sorry, didn't see your response) | 14:02 |
| ion | If the pid changes, please file a bug report against the daemon. :-P | 14:04 |
| codebeaker | heh | 14:25 |
| codebeaker | Unicorn (web server) treats a USR2 as an invitation to reload itself, it spawns a new master process - and replaces the old one as the worker processes complete their tasks | 14:26 |
| codebeaker | so that's a perenial problem | 14:26 |
| codebeaker | and in Rails land, booting an application takes 45 seconds | 14:26 |
| ion | Perhaps Unicorn could have a very thin parent process that just keeps the child running and dies if the child dies. That would result in a constant pid. | 14:28 |
| SpamapS | codebeaker: initctl reload does in fact send HUP to the tracked pid | 15:32 |
| codebeaker | but it says that it's used for reloading the initctl script | 15:33 |
| SpamapS | codebeaker: anything that forks and then exits multiple times in its lifecycle cannot be tracked by upstart | 15:33 |
| SpamapS | codebeaker: wrong, that is reload-configuration | 15:33 |
| codebeaker | ok, so that is "restart" is a stop/start | 15:33 |
| SpamapS | yes, restart also does not reload the job file between stop/start | 15:34 |
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