The following is likely a misunderstanding on my part, so any help is appreciated.
I am using the official wordpress:latest image. By default, the docker compose file creates two volumes - one for the database and one for files. I am playing around with running these directly within the container, so have removed the volume statements. For the purposes of this post, let’s not drill down on why 
- separate topic. Suffice to say that the instances that do NOT use volumes seem to be much quicker.
After making some initial changes to my WordPress instance (add/remove plugins, etc) I am trying to create images using Docker Commit (one for each container). The commit commands run without errors, the images are created and I can create a docker compose file that successfully launches WordPress from these two new images.
However, the resultant WordPress environment never reflect the changes I made (adding plugins, etc). I just get prompted again as if I am at a fresh WordPress install i.e. the state before I made my plugin changes.
Since I am just starting out with Docker in earnest, I’d like to understand why this is happening. I see a couple of potential explanations.
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Do I need to pause or stop containers before I commit to an image or can I apply it to a running container?
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Are there any issues with committing to an image using the same image name i.e. essentially updating the image, rather than creating a new one?
Thank you.