diff --git a/recipes/discourse/crud.sh b/recipes/discourse/crud.sh
index 0c0fb71..e05b926 100755
--- a/recipes/discourse/crud.sh
+++ b/recipes/discourse/crud.sh
@@ -31,8 +31,20 @@ function _create() {
     admin_password=$(load_yaml_from_expanded services[\""$domain"\"][\""$subdomain"\"].data.admin.password)
     redis_password=$(load_yaml_from_expanded credential.redis)
 
+    redis_host=$(lxc list ct1 -c4 -f csv | cut -d' ' -f1)
+
+    echo -n "count redis databases..."
+    redis_database=$(lxc exec ct1 -- bash -c "redis-cli -h $redis_host -a $redis_password INFO keyspace | tail -n1 | grep db | cut -d: -f1")
+    redis_database=${redis_database#db}
+    if [[ "$redis_database" =~ ^[0-9]+$ ]]; then
+        redis_database=$((redis_database + 1))
+    else
+        redis_database=0
+    fi
+    PREFIX='' echo $redis_database
+
     mkdir -p "$MIAOU_CONFIGDIR/apps/discourse"
-    APP_REDIS_PASSWORD=$redis_password APP_DOMAIN=$domain APP_SUBDOMAIN=$subdomain APP_FQDN=$fqdn APP_PORT=$port APP_NAME=$longname tera -e --env-key env -t "$MIAOU_BASEDIR/templates/apps/discourse/forum.yml.j2" -o "$MIAOU_CONFIGDIR/apps/discourse/$longname.yml" "$MIAOU_CONFIGDIR/miaou.expanded.yaml" >/dev/null
+    APP_REDIS_DB=$redis_database APP_REDIS_PASSWORD=$redis_password APP_DOMAIN=$domain APP_SUBDOMAIN=$subdomain APP_FQDN=$fqdn APP_PORT=$port APP_NAME=$longname tera -e --env-key env -t "$MIAOU_BASEDIR/templates/apps/discourse/forum.yml.j2" -o "$MIAOU_CONFIGDIR/apps/discourse/$longname.yml" "$MIAOU_CONFIGDIR/miaou.expanded.yaml" >/dev/null
     echo "creating templates ... OK"
 
     echo "copying files to container <$container> ... "
diff --git a/templates/apps/discourse/forum.yml.j2 b/templates/apps/discourse/forum.yml.j2
index 22c8a5e..cc4b689 100644
--- a/templates/apps/discourse/forum.yml.j2
+++ b/templates/apps/discourse/forum.yml.j2
@@ -37,6 +37,7 @@ env:
 
   DISCOURSE_REDIS_HOST: ct1.lxd
   DISCOURSE_REDIS_PASSWORD: {{ env.APP_REDIS_PASSWORD }}
+  DISCOURSE_REDIS_DB: {{ env.APP_REDIS_DB }}
 
 volumes:
   - volume: