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root@ip-172-31-6-203:/var/lib/docker# cat repositories-aufs
{"Repositories":{}}

root@ip-172-31-6-203:/var/lib/docker# cat repositories-devicemapper
{"Repositories":{"freevision/phantomjs":{"latest":"596c486eb6cdc0a05b9911b2f0c07c3ef9827871513a5e798cb248e0190b01eb"}}}

root@ip-172-31-6-203:/var/lib/docker# docker images -a
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE