# Upgrade Ubuntu from 18.04 to 20.04

[TOC]

!!! warning

    THIS IS A DRAFT DOCUMENT, DO NOT APPLY IT.

### 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](./iredmail.releases.html).

### Upgrade OS

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

### 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.iredapd.html)
- [Upgrade iRedAdmin(-Pro)](./migrate.or.upgrade.iredadmin.html)
- [Upgrade mlmmjadmin](./upgrade.mlmmjadmin.html)

## Configurations

* `/etc/php/7.4/fpm/pool.d/www.conf`

```
[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
```