Docker vs Kubernetes vs Mojo

I have been making some good progress on my second run through of The Docker Book. I am definitely learning different things this time around. I have just completed the chapter on using Docker to make the testing of a web page easier – spinning up containers with different web technologies to test a simple page. I am now running through the chapter on doing something similar with a web application.

Confession time, I lost a little motivation over the past couple of weeks.  Not sure why but possibly a bit of tiredness, work being tough and everyone going back to the school routine.  Feel like my mojo has come back a bit in recent days though.

Despite my fun with Docker, more than one person I know has been hinting that Kubernetes has been “winning the war”.  In general, I think it would be a good idea to get stuck into a few specific technology areas next.  For a while I have been planning to run through Mongodb tutorials and my Git knowledge is not great so that needs some TLC too.  I will add Kubernetes to the list but there does not seem to be as many decent books and tutorials as for Docker.

Finally, I have produced the following Dockerfile whilst running through basic Docker commands.

# comment
# practising Docker commands
FROM ubuntu:16.04
MAINTAINER richardx14 ""
#RUN apt-get update; apt-get install -y nginx
#RUN echo 'container!' > /var/www/html/index.html
# CMD when container has been launched. If you use a command after docker run, it overrides this
CMD ["/bin/bash"]
# ENTRYPOINT - any params used after docker run get passed as params to the ENTRYPOINT. Similar to CMD
# WORKDIR - cd
WORKDIR /var/log
# ENV env variables. Persisted into containers that are launched from image
# USER account, UID, group that containers run from the image will be run by
# VOLUME - adds volumes to containers created from image. Allows access to the containers volumes
VOLUME ["/var/log"]
# ADD adds from build env into image
ADD testaddfile /var/log/testaddfile
# COPY add without without decompression. Will create missing directories
COPY testaddfile /var/log/copyoftestaddfile
COPY testaddfile /test/add/file/testaddfile
# LABEL - add metadata
LABEL name="Richard's test label"
# ARG - pass build time variables, can set default. use --build-arg build=buildnumber
ARG build
ARG builduser=user
# SHELL can override default shell
HEALTHCHECK --interval=60s --timeout=1m --retries=5 CMD curl || exit 1
# ONBUILD triggered when image is used as the basis for another image
ONBUILD LABEL name="Richard's test label ONBUILD"


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