Only the install user can be defined in the new cluster

问题说明

使用pg_upgrade升级postgresql的时候
升级前检测 提示如下
Checking database user is the install user Only the install user can be defined in the new cluster. Failure, exiting

原因: 新的postgresql里有除了安装用户之外的用户 我的安装用户是postgres 所以在升级前 我应该保证只有postgres用户

执行操作删除用户后 好了

postgres=# drop user replicator;
DROP ROLE
postgres=# \du
                                    List of roles
 Role name  |                         Attributes                         | Member of
------------+------------------------------------------------------------+-----------
 postgres   | Superuser, Create role, Create DB, Replication, Bypass RLS | {}

删除完之后 再次检测 如下 已经ok了

... ...
Checking for prepared transactions                          ok
Checking for new cluster tablespace directories             ok

*Clusters are compatible*