'docker suprisingly persistent although it should not be
I have a docker image running for powering a wordpress site. As far as I know, Docker images are not persistent. so any change i make will be discarded once i stop the image.
however, i entered the image like "docker exec -it [IMG] bash", ran "$ apt update" and did some "$ apt install [STUFF]" and even after i have stocked the image and restarted it, the installed packages are still present.
Shouldn't they dissapear? Isn't this the reason why these docker files always contain some "$ apt install [STUFF]"?
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