How to check what OS a docker image depends on?

Question

I want to extend my jenkins image to have docker installed so it can build a Dockerfile out of a project. I found a nice install script for docker but only for Ubuntu 64bit. What I need to know is if the parent images of my jenkins image base on Ubuntu 64bit so I can use this install script without any problems.

I used docker image inspect <imagename> already but it only yields hashes for former image versions it seems.

Answer 1

docker run <image-name> /etc/*release*

It will return the metadata about your image.

See example output here

Answer 2

Following command worked docker run mysql cat /etc/os-release.

Output:

PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
. . .