no pg_hba.conf entry for host "[local]", user "postgres", database "template1"

I have this message:

vacuumdb: could not connect to database template1: FATAL:  no pg_hba.conf entry for host "[local]", user "postgres", database "template1", SSL off

Solution is to open file:

/var/lib/pgsql/data/pg_hba.conf

Add these lines:

local all all md5
host all all 127.0.0.1 255.255.255.255 md5

Restart Postgres service:

service postgresql restart

And of course leave a comment if this solve your case ;)