psql连接报错 .s.PGSQL.5432

psql: error: connection to server on socket "/var/pgsql/data/.s.PGSQL.5432" failed: No such file or directory
       Is the server running locally and accepting connections on that socket?

问题分析：

[postgres@localhost ~]$ cat /opt/postgresql/pgdata/postgresql.conf | grep unix_socket_directories
#unix_socket_directories = '/tmp'       # comma-separated list of directories

解决方式：修改/opt/postgresql/pgdata/postgresql.conf文件中的unix_socket_directories参数

unix_socket_directories='/var/postgresql/pgdata'   # 修改成自己的 pgsql 数据文件目录

# 重启服务
pg_ctl restart