Add migration steps

pages/02.linux/nextcloud/default.en.md

@@ -261,6 +261,47 @@ mariadb -h [SERVER] -u [USERNAME] -p[PASSWORD] [DB NAME] < nextcloud-sqlbkp.bak
 
 > [Nextcloud documentation](https://docs.nextcloud.com/server/latest/admin_manual/maintenance/restore.html)
 
+## Migration
+
+### Tips
+
+- Allow login to the original host as root user
+
+### Steps
+
+- (New host) Install dependencies
+- (Original host) Enable maintenance mode
+- (Original host) Create database backup
+- (New host) Restore database backup
+- (New host) Recreate Nextcloud database user
+- (New host) Copy full Nextcloud folder
+  - Preserve the permissions as much as possible (see rsync command below)
+  - `sudo rsync -a --progress root@172.18.50.101:/var/www/nextcloud /var/www/`
+- (New host) Copy apache2 configuration file
+- (New host) Enable apache2 Nextcloud site and disable default site
+- (New host) Redo php limits configuration
+- (New host) Upgrade Nextcloud (required for php 8.2 compatibility)
+
+### Notes on configuration files
+
+#### PHP
+
+##### Apache2: `/etc/php/8.2/apache2/php.ini`
+
+Change `memory_limit` to `1G`
+
+Disable `post_max_size` by setting `0`  
+Previously used `20G` in the old Nextcloud installation
+
+Change `upload_max_filesize` to `20G`
+
+##### CLI: `/etc/php/8.2/cli/php.ini`
+
+Disable `post_max_size` by setting `0`  
+Previously used `20G` in the old Nextcloud installation
+
+Change `upload_max_filesize` to `20G`
+
 ## Collabora Online Container
 
 ! This chapter is unfinished