[Koha-bugs] [Bug 21366] Add Plack reload

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21366

--- Comment #14 from David Cook <dcook at prosentient.com.au> ---
Created attachment 139011
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=139011&action=edit
Bug 21366: Add koha-plack --reload to gracefully restart Plack/Starman

This patch adds a "--reload" option to koha-plack, which allows
a sysadmin to gracefully restart Koha.

This is very useful when installing Koha plugins or deploying a hot fix
where you need to change code but don't want to interrupt anyone's
usage of Koha.

0. Apply patch
1. cp /usr/sbin/koha-plack /usr/sbin/koha-plack.bak
2. cp debian/scripts/koha-plack /usr/sbin/koha-plack
3. ps -efww | grep "starman"
4. Now at roughly the same time do the following two actions:
    4a. Go to http://localhost:8081/cgi-bin/koha/about.pl
    4b. koha-plack --reload kohadev
5. Note that the web request completes successfully
6. ps -efww | grep "starman"
7. Note that the "starman master" process stays alive, but the "starman worker"
processes have been restarted

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