Installing procps in postgres:11.10 docker image

  apt-get, docker, postgresql

I am using postgres:11.10 image from dockerhub and I am looking to install the ‘procps’ package on the image prior to running the image. To that end I have added RUN apt-get install procps in my Dockerfile.

However, while building the image I get the following:

E: Unable to locate package procps
ERROR: The command '/bin/sh -c apt-get install procps' returned a non-zero code: 100

My question is, when executing RUN apt-get install procps, how does Docker determine which debian repositories to consult while searching for packages? Does the docker installation on the host determine the debian repositories to consult or is it determined by the repositories configured in the base image?

Source: Docker Questions