Issue with postgres login

Hi team,

We are facing the below issue while logging with postgres as given below:

[centos(at)ip-192-90-2-208 ~]$ su - postgres
Password:
Last login: Thu Nov 23 16:15:45 UTC 2017 on pts/1
-bash-4.2$ psql
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
-bash-4.2$

OS: Centos
AWS environment

Regards,
Daulat

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