1] Process using uwsgi:
uwsgi services doesn't support for graceful shutting down [1].
It requires some changes in unit files [2] including adding below
graceful shutdown hook and changing KillSignal:
--hook-master-start "unix_signal:15 gracefully_kill_them_all
All the steps and changes required are specified in etherpad [1].
2] Non uwsgi services needs below changes:
In [service] section:
a. Add KillMode = process
b. Add TimeoutStopSec = infinity
NOTE:
Creating unit file for services other than uwsgi is handled by the
'write_user_unit_file' function [3]. This function is common for all
the services so this patch adds the above mentioned parameters for
services using ServiceLauncher also though they don't require.
Added a new stackrc variable WORKER_TIMEOUT which is required to add
graceful shutdown support to uwsgi services. It will be set as a value
to 'worker-reload-mercy' [4] in uwsgi file of service. The default
value set to this variable is 90.
[1] https://etherpad.openstack.org/p/uwsgi-issues
[2] https://www.freedesktop.org/software/systemd/man/systemd.kill.html
[3] 2967ca3dfd/functions-common (L1439-L1461)
[4] http://uwsgi-docs.readthedocs.io/en/latest/Options.html#worker-reload-mercy
Co-Authored-By: Dinesh Bhor <dinesh.bhor@nttdata.com>
Change-Id: Ia95291325ce4858b47102dd49504250183f339ab
477a962861