创建PostgreSQL数据库vuerecipe_development时出错：拨打tcp 127.0.0.1:5432：connect：连接被拒绝

Question

对于Buffalo golang框架，我需要创建一个postgres数据库：

marco@pc01:~/go/src/vuerecipe$ buffalo db create -a
v4.11.1

[POP] 2019/06/17 15:27:09 info - create vuerecipe_development   
(postgres://postgres:postgres@127.0.0.1:5432  
/vuerecipe_development?sslmode=disable)
Error: couldn't create database vuerecipe_development: error creating 
PostgreSQL database vuerecipe_development: dial tcp 127.0.0.1:5432: 
connect: connection refused
Usage:
  buffalo-pop pop create [flags]

Flags:
  -a, --all    Creates all of the databases in the database.yml
  -h, --help   help for create

Global Flags:
  -c, --config string   The configuration file you would like to use.
  -d, --debug           Use debug/verbose mode
  -e, --env string      The environment you want to run migrations 
against. Will use $GO_ENV if set. (default "development")
  -p, --path string     Path to the migrations folder (default 
"./migrations")

couldn't create database vuerecipe_development: error creating 
PostgreSQL database vuerecipe_development: dial tcp 127.0.0.1:5432: 
connect: connection refused
Usage:
  buffalo db [flags]

Aliases:
  db, db

Flags:
  -h, --help   help for db

按照此问题的答案中的提示和说明进行操作： Can't connect to Postgresql on port 5432 - StackOverflow

我停止了postgresql服务：

marco@pc01:~/go/src/vuerecipe$ sudo systemctl stop postgresql.service

我修改了/etc/postgres/11/main/postgresql.conf中的listen_addresses：

listen_addresses = '*'

并将以下三行添加到/etc/postgres/qq/main/pg_hba.conf的末尾：

host    all             all             0.0.0.0/0               md5
host    all             all             ::/0                    md5
host    all             all             192.168.1.7/32          md5

并重新启动postgresql服务：

marco@pc01:~/go/src/vuerecipe$ sudo systemctl start postgresql.service

但是问题仍然存在：

marco@pc01:~/go/src/vuerecipe$ buffalo db create -a
v4.11.1

[POP] 2019/06/17 15:46:39 info - create vuerecipe_development  
(postgres://postgres:postgres@127.0.0.1:5432  
/vuerecipe_development?sslmode=disable)
Error: couldn't create database vuerecipe_development: error creating 
PostgreSQL database vuerecipe_development: dial tcp 127.0.0.1:5432: 
connect: connection refused
Usage:
  buffalo-pop pop create [flags]

是否有任何提示和建议来解决与PostgreSQL数据库的连接问题？

期待您的帮助。 马可

防火墙处于非活动状态：

marco@pc01:~/go/src/vuerecipe$ sudo ufw status
Status: inactive

已解决：读完这篇文章：https://askubuntu.com/questions/50621/cannot-connect-to-postgresql-on-port-5432之后，我删除了以前的postgres-11安装，然后重新安装。