You needn't (and shouldn't) edit the config file in the image. Going into /var/lib/docker/images and editing things is bound to end poorly. Most images have e

You needn't (and shouldn't) edit the config file in the image. Going into /var/lib/docker/images and editing things is bound to end poorly. Most images have environments variables you can set that will control the config, or you can bind mount a config file from anywhere on your hard drive. > Now i need to install a docker, type some docker install command, that pulls who-knows how many files, puts them in some 'weird' location, including the config file (which belongs in /etc), so instead of having a 2mb service, I now have a 1gb docker image sitting on my system, with a config file hidden somewhere, and I, the user, don't see any benefits, compared to just 'apt-get install'-ing something. On the other hand, I can `docker-compose up -d` on practically any platform in existence. I don't have to worry about what package manager this host uses, or whether the version they have supports the config flags I'm using. It's the same everywhere. I don't have to deal with the pain that is 3rd party apt repositories, and handling pinning when they want to ship a newer version of a library than the main OS does (I believe Salt does this). That, perhaps, is worth less to you than to other people. I would _far_ rather handle setting up another couple Docker containers in Compose than I would handle figuring out which Apt repository they actually publish to, and handling the installation, and fixing the configs (because many services ship with broken configs, because they have no idea what your Postgres password is, for example. Not true of Docker, their docker-compose.yml typically includes setting the password). This is especially true of multi-component systems, or systems that I'm testing out or using in dev. If I want to enable the Jaeger built into an application, it's one command to run it. In apt, that would have to install 4 or 5 daemons that I would then need to configure. I also think complaining about disk space is rather disingenuous at this point. Yes, disk space costs money. No, you are unlikely to have Docker make a significant difference in the price to build your PC. 1GB is huge for a Docker image (but many people are bad at trimming them down, so I'll accept it). In 2017, storage cost roughly $0.03/GB on an HDD. You're paying 3 cents to store that Docker image. Probably less at this point, I saw an article about WD releasing $15/TB HDDs in the near future. The moderate performance impact seems more important to me.