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docker exect it 40e39bd0329a /bin/bashand then in the container run thepsqlcommand, but it always gave me errors.psql: FATAL: role "root" does not existwhere user that you are connecting as, to the container (root@<SOMETHING>:/#)docker-compose exec postgres psql -U project -W projectworks too if you have a running container (docker-compose up postgres).psql: warning: extra command-line argument "project" ignoredFor me this worked,docker exec -it <container_id> psql -U <username> -W <database_name>PGPASSWORDenvironment variable (e.g. indocker-compose.yml), you won't need to type any password.