"/tmp/.s.PGSQL.5432" failed

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

psql 명령어로 postgresql 을 실행하려다 위와 같은 에러가 뜨면서 실행이 되지 않았다. 이런 경우,

iMac ~ % rm /opt/homebrew/var/postgres/postmaster.pid
iMac ~ % brew services restart postgresql            
Stopping `postgresql`... (might take a while)
==> Successfully stopped `postgresql` (label: homebrew.mxcl.postgresql)
==> Successfully started `postgresql` (label: homebrew.mxcl.postgresql)
iMac ~ % psql postgres

brew services restart postgresql 후 다시 psql 을 실행하면 제대로 작동한다.