I use below content Dockerfile builded a alphine-test image:
FROM rarenicks/alphine
WORKDIR /app
COPY ./src/ /app
RUN echo 321 >> test.txt
CMD tail -f test.txt
you see the CDM tail -f test.txt is a block command.
when I run the image as a container:
[root@att dockerfiles]# docker run alphine-test:v1.0
WARNING: IPv4 forwarding is disabled. Networking will not work.
321
^C
quit
^C
^Z
^P
^Z^X^C^
now I cannot exit from the container now.