postgresql - psql: could not connect to server [ubuntu]

Question

Under the postgres user, I tried the psql command and I'm getting this error:

psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"

But when I run /usr/local/pgsql/bin/psql, it is working.

Is there anything wrong with my configuration?

Answer 1

上述问题似乎与 PostgreSQL 默认端口号有关，

更改 postgresql.conf 文件中的端口号并重新启动数据库服务器。如果您在安装时更改了端口。

（或者）

而不是 psql 输入完整的命令

 "psql -p 5432 -h localhost"

Answer 2

您也可以包括数据库用户：

psql -U postgres -p 5432 -h localhost

Answer 3

您是否重新安装了 postgresql-9.6.3 ？

您需要完全卸载 postgresql

sudo apt-get --purge autoremove postgresql*

sudo apt install postgresql-9.6