在linux部署项目的时候报数据库连接错误，请问该如何解决？

SQLSTATE[08006] [7] could not connect to server: Connection refused Is the server running on host "127.0.0.1" and accepting TCP/IP connections on port 5432?报这个错误！百度了 https://blog.csdn.net/weixin_33901926/article/details/94605018这个跟他设置一模一样还是没解决。请问应该考虑那些问题，或大致思路有吗？ https://blog.csdn.net/weixin_33901926/article/details/94605018%E8%BF%99%E4%B8%AA%E8%B7%9F%E4%BB%96%E8%AE%BE%E7%BD%AE%E4%B8%80%E6%A8%A1%E4%B8%80%E6%A0%B7%E8%BF%98%E6%98%AF%E6%B2%A1%E8%A7%A3%E5%86%B3%E3%80%82%E8%AF%B7%E9%97%AE%E5%BA%94%E8%AF%A5%E8%80%83%E8%99%91%E9%82%A3%E4%BA%9B%E9%97%AE%E9%A2%98%EF%BC%8C%E6%88%96%E5%A4%A7%E8%87%B4%E6%80%9D%E8%B7%AF%E6%9C%89%E5%90%97%EF%BC%9F

linux上面有安装pgsql数据库吗
防火墙是否有开放5432端口。