4.9.0

This new release introduce some important changes from PR #241 to improve production use of Mattermost with Docker.
There are 2 important changes for existing installations

One important change is that we don't use root user by default to run the Mattermost application. So, as explained on the README, if you use host mounted volume you have to be sure that files on your host have the correct UID/GID (by default, 2000). In practice, you should just run following commands :

mkdir -p ./volumes/app/mattermost/{data,logs,config} 
chown -R 2000:2000 ./volumes/app/mattermost/

The second important change is the port used by Mattermost application container. The default port is now 8000, and existing installations that use port 80 will not work without a little configuration change. You have to open your Mattermost configuration file (./volumes/app/mattermost/config/config.json by default) and change the key ServiceSettings.ListenAddress to :8000.

Changelog for Mattermost 4.9.0 is here