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Introduction to Operating System upgrade

Introduction to details of operating system upgrade on the Managed Web Service

The operating system currently used on the Managed Web Service is Debian 8 (Jessie).  We are arranging  the upgrade of the MWS servers to the next version of the operating system, Debian 9 (Stretch).

We are making available test versions of your MWS servers, so that you can check whether your websites will work correctly in Debian Stretch before you switch to using the new operating system in production. Documentation on the procedure for upgrading is available here.

Debian have some general notes on the changes between the two operating system versions at https://wiki.debian.org/NewInStretch    and https://www.debian.org/releases/stretch/amd64/release-notes/ch-whats-new.en.html

There are some details on the changes to PHP and Python 

The MySQL database will be replaced with MariaDB