Update readme with upgrade mariadb

README.md

@@ -14,10 +14,6 @@ Once DNS are properly setup on host:
 
 ### Services
 
-#### Flood
-
-- Socket: `/config/.local/share/rtorrent/rtorrent.sock`
-
 ## Create a new service
 
 1. Add the service in `docker-compose.yml`
@@ -27,6 +23,28 @@ Once DNS are properly setup on host:
 5. Update the local zone in `./bind9/guiotte.db`
 6. Restart `bind9` and `swag`: `dcc restart bind9 swag`
 
+## Update MariaDB
+
+After upgrading from one major MySQL/MariaDB release to another, we have to run `mariadb-upgrade` on the services using MariaDB.
+
+### Lychee
+
+```bash
+dcc stop lychee
+dcc exec lychee-db mariadb-upgrade -u root -p"$(cat lychee-db-root-pw.secret)"
+dcc restart lychee-db
+dcc up -d lychee
+```
+
+### Nextcloud
+
+```bash
+dcc stop nextcloud
+dcc exec nextcloud-db mariadb-upgrade -u root -p"$(cat nextcloud-db-root-pw.secret)"
+dcc restart nextcloud-db
+dcc up -d nextcloud
+```
+
 ## Logs
 
     2022-11-02 Created OVH token