Docker - How can run the psql command in the postgres container?

If you need to restore the database in a container you can do this:

docker exec -i app_db_1 psql -U postgres < app_development.back

Don't forget to add -i.

This worked for me:

goto bash :

docker exec -it <container-name> bash

from bash :

psql -U <dataBaseUserName> <dataBaseName>

or just this one-liner :

docker exec -it  <container-name> psql -U <dataBaseUserName> <dataBaseName>

helps ?

docker exec -it yiialkalmi_postgres_1 psql -U project -W project

Some explanation

docker exec -it The command to run a command to a running container. The it flags open an interactive tty. Basically it will cause to attach to the terminal. If you wanted to open the bash terminal you can do this

docker exec -it yiialkalmi_postgres_1 bash

yiialkalmi_postgres_1 The container name (you could use the container id instead, which in your case would be 40e39bd0329a )
psql -U project -W project The command to execute to the running container
U user
W Tell psql that the user needs to be prompted for the password at connection time. This parameter is optional. Without this parameter, there is an extra connection attempt which will usually find out that a password is needed, see the PostgreSQL docs.
project the database you want to connect to. There is no need for the -d parameter to mark it as the dbname when it is the first non-option argument, see the docs: -d "is equivalent to specifying dbname as the first non-option argument on the command line."

These are specified by you here

environment:
    POSTGRES_DB: project
    POSTGRES_USER: project
    POSTGRES_PASSWORD: project

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