Another question When i run a container,i access to the linux

Question

Another question When i run a container,i access to the linux

shell. If i install something or do any changes in the container,will it be written to the image that it's made of??
I nean what if i don't install something using dockerfile CMD or RUN and just do it inside the already running container. What if i stop it or duplicate it using swarm or maybe scale it with kubernetes??
Thank you

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01.10.2018