It seems that useradd is not in amazonlinux docker base image.
useradd will work when when my Dockerfile install openldap-devel, so RUN useradd my_user will work when I my image have the following:
FROM amazonlinux
RUN yum -y install python3 \
gcc \
python3-pip \
python3-devel \
openldap-devel
When my image is just build from
FROM amazonlinux
RUN yum -y install python3 \
gcc \
python3-pip \
python3-devel
The command RUN useradd my_user fails with the error message /bin/sh: useradd: …