Find below a guide. I am just in the process of doing the same replacement.
This guide is given without any guaranties, use it on your own risk.
Lets say it is version 0.9 (valid for Centos 7)
NOTE: In order to prepare for a revert of the change, not carefully the file owners before/after changing in the /var/www branch. (of course, the simplest way is to make a copy before changing)
1) take a full backup / snapshot of Your iredmail server ( or create a clone, and test the procedure there first)
2) Install a new temp server from scratch, using the same OS and settings as the production server, but select Nginx instead of Apache
3) Prepare the prod server with Nginx and some more required packages (php-fpm, uwsgi-plugin-common, uwsgi-plugin-python)
4) copy /etc/nginx and some more files/dirs from the temp server (described below)
5) change ownership of a number of files from apache to nginx
6) Stop and disable the apache httpd service
7) Enable service for nginx, uwsgi and php-fpm
8) start the services and check with systemctl status xxxxx that they run.
9) verify /mail /iredadmin /SOGo and /awstat
10) reboot the server, and check that all is ok.
Detailed description:
(starting from item "3")
3) Install
yum install php-fpm
yum install uwsgi-plugin-common
yum install uwsgi-plugin-python
4) copy config files from temp server using tar and scp
/etc/uwsgi.d/uwsgi.ini
/etc/php-fpm.d/www.conf
/etc/nginx
/var/www/awstats-statistics
5)Change ownership of some roundcube files owned by apache
# cd /var/www
# find . -group apache -ls
After changing ownership to nginx, it should read as below: (note, a lot of files are owned by root)
Should read:
100903878 8 -rw------- 1 nginx nginx 4770 Nov 2 12:26 ./roundcubemail-1.3.0/config/config.inc.php
34618621 0 drwxr-xr-x 2 nginx nginx 22 Nov 2 12:26 ./roundcubemail-1.3.0/logs
35345188 4 -rw-r--r-- 1 nginx nginx 164 Jun 26 20:56 ./roundcubemail-1.3.0/logs/.htaccess
35345062 0 drwxr-xr-x 2 nginx nginx 22 Nov 2 12:26 ./roundcubemail-1.3.0/plugins/enigma/home
100903880 20 -r-------- 1 nginx nginx 18513 Nov 2 12:26 ./roundcubemail-1.3.0/plugins/password/config.inc.php
100902411 0 drwxr-xr-x 2 nginx nginx 22 Nov 2 12:26 ./roundcubemail-1.3.0/temp
100902831 4 -rw-r--r-- 1 nginx nginx 164 Jun 26 20:56 ./roundcubemail-1.3.0/temp/.htaccess
Change the ownership using #chown nginx:nginx <filename> like:
# chown nginx:nginx /var/www/roundcubemail-1.3.0/config/config.inc.php
# chown -R nginx:nginx /var/www/roundcubemail-1.3.0/logs/
# chown -R nginx:nginx /var/www/roundcubemail-1.3.0/temp/
NOTE: ( note /var/www/roundcubemail-1.3.0/plugins/enigma/home/.htaccess is owned by root, all other dir/files under ./enigma/home/ are owned by nginx )
so do:
# chown -R nginx:nginx /var/www/roundcubemail-1.3.0/plugins/enigma/home/
# chown -R root:root /var/www/roundcubemail-1.3.0/plugins/enigma/home/.htaccess
6) systemctl stop httpd && systemctl disable httpd
7) systemctl enable nginx uwsgi php-fpm
8) systemctl start nginx uwsgi php-fpm
systemctl status nginx uwsgi php-fpm
9)...
10) ...
/ Regards
