Tomorrow we have planned a major upgrade of the Phabricator prod server.

Starting from around 00:00 UTC (after Evening SWAT) we want to switch from phab1001 to phab1003 as the production server.

This will involve:

- switching from jessie to stretch - switching from mod_php to php-fpm - switching from PHP 5 to PHP 7.2 - upgrading apache from 2.4.10 to 2.4.25

We are also hoping it will finally fix the httpd memory leaks we have been seeing on the current server for a long time and which require periodic service restarts.

In case we run into any unexpected issue we will simply fall back to phab1001 and keep running as before.

https://phabricator.wikimedia.org/T221389 https://phabricator.wikimedia.org/T182832 https://phabricator.wikimedia.org/T190568 https://phabricator.wikimedia.org/T151070

Cheers,

Daniel and Mukunda