THIS IS A DRAFT DOCUMENT, DO NOT APPLY IT.
Before upgrading server OS, it's better upgrade iRedMail to the latest stable release first. You can find all upgrade tutorials here.
After you have latest iRedMail release running, it's ok to upgrade server OS
Dovecot 2.3 breaks some configurations used in Dovecot 2.2, please follow our tutorial to upgrade its config files:
After upgraded server OS, please re-upgrade iRedAPD, iRedAdmin(-Pro) and mlmmjadmin even you're already running the latest versions before upgrading OS, their upgrade scripts will help fix some issues caused by OS upgrade.
[inet] user = www-data group = www-data listen = 127.0.0.1:9999 listen.owner = www-data listen.group = www-data listen.mode = 0660 ; IP addresses must be separated by comma, and no space between comma and ip. listen.allowed_clients = 127.0.0.1 pm = dynamic pm.max_children = 200 pm.start_servers = 10 pm.min_spare_servers = 5 pm.max_spare_servers = 10 pm.max_requests = 500 pm.status_path = /php-fpm-status ping.path = /php-fpm-ping request_terminate_timeout = 60s access.log = /var/log/php-fpm/access.log slowlog = /var/log/php-fpm/slow.log request_slowlog_timeout = 10s