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| openstackgerrit | OpenStack Proposal Bot proposed openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/269983 | 03:23 |
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| openstackgerrit | Merged openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/269983 | 03:55 |
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| bogdando | aspiers, hi | 10:36 |
| bogdando | aspiers, do you think this link may fit the action item? http://serverfault.com/questions/115838/are-pid-files-reliable-for-determining-whether-a-process-is-running | 10:37 |
| bogdando | (and the same PIDs reusage depends on the system load and intensity of processes spawned around) | 10:38 |
| aspiers | hi | 10:39 |
| aspiers | bogdando: remind me which action item? | 10:42 |
| bogdando | bogdando to give some concrete examples where pid files (and perhaps hence systemd) cannot be relied on | 10:42 |
| bogdando | from the Monday IRC meeting | 10:42 |
| aspiers | oh | 10:43 |
| aspiers | I don't think that's a strong argument | 10:43 |
| aspiers | are you talking about this scenario: | 10:43 |
| bogdando | A: a crash-stop failure of a process, leaving the PIDfile AND the process running while stopped function in fact | 10:45 |
| bogdando | B: a lazy pidfile creation, example: MySQL creates only after replica finished | 10:45 |
| bogdando | C: a kinda Byzantine failure when a process creates wrong pidfile | 10:46 |
| aspiers | A: crash-stop does not leave the process running? | 10:46 |
| aspiers | B and C are just bugs | 10:46 |
| bogdando | not always. It just stops the "code flow" | 10:46 |
| bogdando | for example it may sleep for ever | 10:46 |
| aspiers | a hung process gets caught by the OCF RA monitor action | 10:47 |
| bogdando | B is not a bug, AFAICT | 10:47 |
| aspiers | if MySQL is running, there should be a pid file, period | 10:47 |
| bogdando | well, may be it is a bug, but example exists :) | 10:47 |
| aspiers | even stale pid files are not a problem | 10:48 |
| aspiers | as long as you check that the name of the process referred to by the pid file is the one you were expecting | 10:48 |
| bogdando | only if you strengthen by the additional procfs checks perhaps | 10:48 |
| aspiers | if it doesn't match, the pid in the stale file got reused by another process => delete stale pid file | 10:49 |
| bogdando | does systemd check? | 10:49 |
| aspiers | if it does match, the service is running (maybe again, coincidentally with the same pid) => nothing to do | 10:49 |
| aspiers | I don't know | 10:49 |
| aspiers | but I guess systemd probably has extra checks relating to cgroups etc. | 10:49 |
| aspiers | again, this gets covered by a combination of systemctl status and the RA monitor action | 10:50 |
| bogdando | we could keep in mind the test cases while design the OCF switching to the systemd checks | 10:50 |
| bogdando | A/B/C is easy to simulate with a simple bash script | 10:50 |
| aspiers | sure - I don't think there is any big engineering challenge here | 10:51 |
| aspiers | only thing worth worrying about is race conditions when checking the pid file | 10:51 |
| bogdando | yup | 10:51 |
| bogdando | pacemaker's start vs init's respawn? | 10:51 |
| bogdando | well, I mean RA OCF's start | 10:53 |
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| openstackgerrit | OpenStack Proposal Bot proposed openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/270245 | 15:19 |
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| bogdando | JFYI, new time for HA guide docs team meeting http://lists.openstack.org/pipermail/openstack-docs/2016-January/008209.html | 15:58 |
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| openstackgerrit | Merged openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/270245 | 17:06 |
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