pgpool连接到postgresql状态：“节点正在运行。有连接.postgres：Down”

Question

我尝试使用PGPool配置PostgreSQL来管理loa平衡和复制，但我有这样的错误：

image

The node is in operation. There is connection.  postgres: Down

from postgreSQL service is up:
root@n43sl:/var/www# service postgresql
Usage: /etc/init.d/postgresql {start|stop|restart|reload|force-reload|status} [version ..]
root@n43sl:/var/www# service postgresql status
● postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
   Active: active (exited) since Wed 2018-05-09 15:42:33 WIB; 23min ago
  Process: 16192 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
 Main PID: 16192 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 4915)
   Memory: 0B
      CPU: 0
   CGroup: /system.slice/postgresql.service

在pgpool admin中配置像这样后端： Setting PGPool Admin

任何线索如何解决这个案子？