Error in importing sql file in postgres database :: psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL: Peer authentication failed for user "postgres"

Error ::  Very Important Error comes sometimes ::

psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL:  Peer authentication failed for user "postgres"

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Solution :: 

1. check postgres cluster ::

$ 

2. check config name ::

$ ps -ef | grep postgres

$ sudo pg_ctlcluster 15  main start

$ sudo service postgresql restart

$ sudo nano /etc/postgresql/15/main/

$ sudo nano /etc/postgresql/15/main/pg_

three files comes ::

pg_ctl.conf    pg_hba.conf    pg_ident.conf 

$ sudo nano /etc/postgresql/15/main/pg_hba.conf

$ sudo nano /etc/postgresql/15/main/pg_hba.conf  

this above command will open the edit file at terminal 

Now will come inside one diff file edit file --

here change peer  to  md5  here 

after that start service postgresql by the below command :: 

$ sudo service postgresql restart

after all above commands give command of sql file import :: 

$ psql -U postgres hrms-finace < local_sql_file_02_12_22.sql