ningyougang opened a new pull request #2594: Fix bug on ansible variable 
   if `ansible node` and `target node` is not the same node, it will have 
   - include: db/recreateDb.yml
       dbName: "{{ db.whisk.auth }}"
       forceRecreation: False
   the `db.whisk.auth` reference varaible : `db_prefix`, the `db_prefix` value 
is `ansible node`'s  `{{ ansible_user_id|lower }}_{{ ansible_hostname|lower }}_`
   - name: (re)start controller
       name: controller{{ groups['controllers'].index(inventory_hostname) }}
          "DB_WHISK_AUTHS": "{{ db.whisk.auth }}"
   But above ansible task's  `db.whisk.auth`'s `db_prefix` value is `controller 
node`'s  `{{ ansible_user_id|lower }}_{{ ansible_hostname|lower }}_`
   So if `ansible node` is not same as `controller node`, the controller's ENV 
`DB_WHISK_AUTHS` will reference a `not exist auth db address`. 
   So it is better to write the `db_prefix` value to hardcode to keep the 
default running env well.
   If you don't like the `db_prefix` value, can change it what you like.
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