What do the following numbers mean in Dockerfile?

Question

Java

Hey everyone, the

following line in the Dockerfile ends up with an error (11.0.6+10-1~deb10u1' for 'openjdk-11-jre' was not found) during docker build:

RUN apt-get update && apt-get install -y --no-install-recommends openjdk-11-jre=11.0.6+10-1~deb10u1

Can you explain what is meant after the = sign? And as a bonus, what is jre used for in dotnetcore applications?

all the best, Vadim

Answer 1

=You don't need to specify the exact version (after the ) to install openjdk-11-jre . Most likely, this version is no longer in the repository, since it was released newer.

And as a bonus, what is jre used for in dotnetcore applications?

Not needed, in theory. These are two competing technologies. You can even lower it and see what happens without it.
This should be enough:

RUN apt update && \
apt install -y --no-install-recommends \
  openjdk-11-jre

# для проверки:
RUN java --version

Answer 2

No package found with this version

Answer 3

Run sort of defines the commands that are run by default when the container starts?