| jY | is there anyway to tell upstart a pid has changed? | 18:54 |
|---|---|---|
| redondos | hello. what's the recommended way of outputting stdout and stderr of my daemon to a specific file? (not /var/log/upstart/daemon.log) | 20:01 |
| jY | redirect ater the process to the file | 20:07 |
| jY | after* | 20:07 |
| jY | app 1>> stdout.log 2>> stderr.log | 20:08 |
| redondos | jY: I'm trying that but upstart is still writing to /var/log/upstart/daemon.log | 20:11 |
| redondos | do I need to specify any particular value for "console"? | 20:11 |
| redondos | i know the default is "log", and I also tried "output" | 20:11 |
| xnox | jY: change pid how? after initial started event? | 20:19 |
| xnox | redondos: there should be an example somewhere, one sec. | 20:20 |
| jY | xnox: haproxy on a reload changes pids | 20:20 |
| jY | which causes upstart to freak out | 20:20 |
| xnox | jY: that's evil. and needs investigation. you can now specify a custom reload signal, such that you could make "reload" send a harmless signal. | 20:22 |
| xnox | jY: and have some other job to reload haproxy, or do full restarts instead. | 20:23 |
| xnox | redondos: to redirect output you should be able to use "logger" | 20:23 |
| jY | xnox: i take it now means it's not in the version in ubuntu 12.04? | 20:23 |
| xnox | jY: no, not in 12.04. | 20:23 |
| jY | ok thanks | 20:24 |
| xnox | jY: is there a bug open against haproxy? | 20:25 |
| jY | xnox: no but i've talked to some of the devs and they said its the way it is | 20:25 |
| xnox | jY: haproxy package that is on launchpad? | 20:25 |
| xnox | jY: well, ubuntu can patch haproxy and/or change configs and/or upstream patches to get it fixed. | 20:25 |
| jY | ok | 20:26 |
| xnox | jY: 12.04 will have 3 more years of support and 2 more point releases..... | 20:27 |
| xnox | jY: in precise haproxy is not using upstart job, is it? | 20:28 |
| jY | nope | 20:28 |
| jY | we tried haproxy to make restarts quick if it dies | 20:28 |
| jY | i mean we tried upstart | 20:28 |
| xnox | jY: reload doesn't actually reload haproxy. | 20:32 |
| xnox | jY: it suppose to dump every server's state, from source code. | 20:33 |
| jY | ya | 20:33 |
| xnox | jY: it looks like the only way to restart haproxy is to actually "stop and start" it again. | 20:33 |
| xnox | jY: what job / conf file did you use for haproxy? | 20:33 |
| jY | well stop will kill in flight connections | 20:33 |
| jY | if you reload it will wait till they all finish then close the process | 20:34 |
| jY | i think it's like how apache does it | 20:34 |
| xnox | jY: there is "sig_soft_stop" on SIGUSR1 | 20:34 |
| jY | it's just a simple job that does like a exec haproxy -db -f conf.file | 20:34 |
| xnox | jY: -sf <pidlist> | 20:35 |
| xnox | Send FINISH signal to the pids in pidlist after startup. The | 20:35 |
| xnox | processes which receive this signal will wait for all sessions | 20:35 |
| xnox | to finish before exiting. This option must be specified last, | 20:35 |
| xnox | followed by any number of PIDs. Technically speaking, SIGTTOU | 20:35 |
| xnox | and SIGUSR1 are sent. | 20:35 |
| jY | -sf is what we use | 20:36 |
| jY | to reload it | 20:36 |
| xnox | jY: so in pre-stop, you could just send those two signals. | 20:36 |
| xnox | jY: or you can create a job to do that for you. | 20:36 |
| jY | but with pre-stop then it won't think haproxy is up | 20:37 |
| jY | when it is | 20:37 |
| jY | right? | 20:37 |
| xnox | jY: pre-stop is executed upon "restart haproxy", so you will get a graceful restart instead of tear everything down. | 20:37 |
| jY | ok i'll give it a try | 20:38 |
| xnox | jY: alternative is to patch haproxy, to install / call functions which do SIGTTOU & SIGUSR1 at the moment, and make SIGHUP do that. | 20:38 |
| xnox | jY: or you can create "haproxy-reload.conf" task, script, which does "status haproxy | grep -q start/running && then get pid and send SIGTTOU and SIGUSR1 to the main process. | 20:39 |
| xnox | jY: i'd be happy to see that upstart job of yours included in ubuntu =) | 20:40 |
| jY | xnox: ok let me pastebin it | 20:41 |
| jY | http://pastebin.com/V6wy7qfQ | 20:42 |
| xnox | jY: you write pid file to still be able to use /etc/init.d ? | 20:42 |
| jY | for monit | 20:44 |
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