How does official Postgres image create user and database with env variables?

Question

Official Postgres images for Docker uses two environment variables: POSTGRES_USER and POSTGRES_PASSWORD to parametrize database creation:

I expected that the environment variables will be used in the image source:

but there's not trace of them there.

Could you explain how it is made that a user specified with the environment variables is created with a container?

Which is called from the Dockerfile here: github.com/docker-library/postgres/blob/… — Mark O'Connor
– Mark O'Connor, Commented Jun 26, 2015 at 22:26

mykiwi · Accepted Answer · 2015-06-26 23:42:57Z

3

The variables POSTGRES_USER and POSTGRES_PASSWORD are used in the entrypoint.sh file visible here.

answered Jun 26, 2015 at 23:42

mykiwi

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