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Upgrade Ubuntu from 18.04 to 20.04

Upgrade iRedMail to the latest stable release first

Before upgrading server OS, it's better upgrade iRedMail to the latest stable release first. You can find all upgrade tutorials here.

Upgrade OS

After you have latest iRedMail release running, it's ok to upgrade server OS with command do-release-upgrade now.

Upgrade Dovecot config files

Dovecot 2.3 breaks some configurations used in Dovecot 2.2, please follow our tutorial to upgrade its config files:

• Upgrade Dovecot from 2.2.x to 2.3.x

Re-upgrade iRedAPD, iRedAdmin(-Pro), mlmmjadmin to the latest release

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.

• Upgrade iRedAPD
• Upgrade iRedAdmin(-Pro)
• Upgrade mlmmjadmin

Update php-fpm related configurations

• Create directory used to store log files:

mkdir /var/log/php-fpm

• Override config file /etc/php/7.4/fpm/pool.d/www.conf with content below:

[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

• Override file /etc/nginx/conf-available/php-fpm.conf with content below:

upstream php_workers {
    server 127.0.0.1:9999;
}

• Restart php7.4-fpm and nginx services:

service php7.4-fpm restart
service nginx restart

Update clamav config file

Remove deprecated options in /etc/clamav/clamd.conf:

DetectBrokenExecutables
ScanOnAccess
StatsEnabled
StatsPEDisabled
StatsHostID
StatsTimeout

Then restart service clamav-daemon:

service clamav-daemon restart