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How to change the docker image installation directory?

With recent versions of Docker, you would set the value of the graph parameter to your custom path, in /etc/docker/daemon.json (according to https://docs.docker.com/v1.11/engine/reference/commandline/daemon/#daemon-configuration-file).
With older versions, you can change Docker's storage base directory (where container and images go) using the -goption when starting the Docker daemon. (check docker --help). You can have this setting applied automatically when Docker starts by adding it to /etc/default/docker
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