Made a new host group for the first db in the cluster

playbooks/galeradb.yml

@@ -14,13 +14,13 @@
    - include: ../roles/db/tasks/install.yml
 
 - name: Start and create cluser on first db node
-  hosts: db[0]
+  hosts: db_first_cluster_node
   user: root
   tasks:
    - include: ../roles/db/tasks/startcluster.yml
 
 - name: Start mysql on other nodes
-  hosts: db[1-2]
+  hosts: db
   user: root
   tasks:
    - include: ../roles/db/tasks/startmysql.yml