1、aufs
/var/lib/docker/
├── aufs # Storage area for AUFS driver
│ ├── diff # Branch directory of layer
│ ├── layers # Infomation about docker layer
│ └── mnt # Mount point of aufs, root of containers
├── containers # Container configurations
│ (both LXC and Docker-specific)
├── graph # Storage for the images
├── init
│ └── dockerinit-0.7.3 # Used as /sbin/init in containers
├── linkgraph.db # SQLite database storing links
│ and names.
├── lxc-start-unconfined -> /usr/bin/lxc-start # When starting a privileged
│ container, this is used in
│ lieu of lxc-start, to evade
│ AppArmor confinement (which
│ matches by exact path).
├── repositories-aufs # repository infomation
└── volumes # Storage for "anonymous" volumes (those which are not bind-mounts)
来源： http://stackoverflow.com/questions/21016210/function-of-docker-directory-structure-in-var-lib-docker
2、devicemapper
tree /var/lib/docker
/var/lib/docker
├── containers # Where containers are saved
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-json.log # log file
│ │ ├── config.json # The config file of the container, such as state, image, memory, cpu, networking, mount
│ │ ├── hostconfig.json # The host config for this container, such as host mount, port maping, volume from other container
│ │ ├── hostname # hostname
│ │ ├── hosts # host file for this container
│ │ ├── resolv.conf # DNS settings for this container
│ │ └── resolv.conf.hash
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ ├── config.json
│ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-json.log
│ ├── hostconfig.json
│ ├── hostname
│ ├── hosts
│ ├── resolv.conf
│ └── resolv.conf.hash
├── devicemapper # Two types of backend storage DM (devicemapper) and AUFS (advanced multi layered unification filesystem) . RedHat/CentOS/Fedora uses DM as default storage driver. DM supports thin provisioning, loopback mounted sparse file. (http://developerblog.redhat.com/2014/09/30/overview-storage-scalability-docker/, https://github.com/docker/docker/blob/master/daemon/graphdriver/devmapper/README.md, http://www.projectatomic.io/docs/filesystems/)
│ ├── devicemapper
│ │ ├── data # Data loop file
│ │ └── metadata # Metadata loop file
│ ├── metadata
│ │ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-init
│ │ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ │ ├── base
│ │ ├── deviceset-metadata
│ │ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ │ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-init
│ │ └── transaction-metadata
│ └── mnt
│ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-init
│ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-init
├── execdriver # Running container
│ └── native
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
├── graph # Where Images are saved
│ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ │ ├── json
│ │ └── layersize
│ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ │ ├── json
│ │ └── layersize
│ └── _tmp
├── init # docker init binary versions
│ ├── dockerinit-1.3.2
│ └── dockerinit-1.5.0
├── linkgraph.db # SQLite db file that is used for keeping the links between containers
├── repositories-devicemapper # Info for images
├── tmp
├── trust #???
│ └── official.json
└── volumes # Randomly created volumes on host
├── 150967e6f9f81f50a73f56d60fcbd4b189cbf09ee7f7df41f61438d40d2a5057
│ └── config.json
├── a46bf00d73c6c0d79c6390cc52b9383e7779c0695b46d3a152f6b98dd0a69349
│ └── config.json
├── d6cbe5421c0d76c05c76bb56d72ca06f7d1e65813f4a02b9d8a440763006af39
│ └── config.json
└── f1cc2170872cd2592d6847db422fbf474c30fc79255c8da883ccbec5b2523f33
└── config.json
/var/lib/docker
├── containers # Where containers are saved
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-json.log # log file
│ │ ├── config.json # The config file of the container, such as state, image, memory, cpu, networking, mount
│ │ ├── hostconfig.json # The host config for this container, such as host mount, port maping, volume from other container
│ │ ├── hostname # hostname
│ │ ├── hosts # host file for this container
│ │ ├── resolv.conf # DNS settings for this container
│ │ └── resolv.conf.hash
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ ├── config.json
│ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-json.log
│ ├── hostconfig.json
│ ├── hostname
│ ├── hosts
│ ├── resolv.conf
│ └── resolv.conf.hash
├── devicemapper # Two types of backend storage DM (devicemapper) and AUFS (advanced multi layered unification filesystem) . RedHat/CentOS/Fedora uses DM as default storage driver. DM supports thin provisioning, loopback mounted sparse file. (http://developerblog.redhat.com/2014/09/30/overview-storage-scalability-docker/, https://github.com/docker/docker/blob/master/daemon/graphdriver/devmapper/README.md, http://www.projectatomic.io/docs/filesystems/)
│ ├── devicemapper
│ │ ├── data # Data loop file
│ │ └── metadata # Metadata loop file
│ ├── metadata
│ │ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ │ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-init
│ │ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ │ ├── base
│ │ ├── deviceset-metadata
│ │ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ │ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-init
│ │ └── transaction-metadata
│ └── mnt
│ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77-init
│ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ ├── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec-init
├── execdriver # Running container
│ └── native
│ ├── 261e9d1f711e10945f1ad40d9ee5a5d892d4e150ea0ed1a29e8ed49a500e1c77
│ └── fa3339efba1560a1c0b7c140a1c091f68258e9a664d661505a5b1d5b5773d8ec
├── graph # Where Images are saved
│ ├── 10acc31def5d6f249b548e01e8ffbaccfd61af0240c17315a7ad393d022c5ca2
│ │ ├── json
│ │ └── layersize
│ ├── 3310574481b22e66d4beead0e0915a5d090c742724107cb59ae6470573830210
│ │ ├── json
│ │ └── layersize
│ └── _tmp
├── init # docker init binary versions
│ ├── dockerinit-1.3.2
│ └── dockerinit-1.5.0
├── linkgraph.db # SQLite db file that is used for keeping the links between containers
├── repositories-devicemapper # Info for images
├── tmp
├── trust #???
│ └── official.json
└── volumes # Randomly created volumes on host
├── 150967e6f9f81f50a73f56d60fcbd4b189cbf09ee7f7df41f61438d40d2a5057
│ └── config.json
├── a46bf00d73c6c0d79c6390cc52b9383e7779c0695b46d3a152f6b98dd0a69349
│ └── config.json
├── d6cbe5421c0d76c05c76bb56d72ca06f7d1e65813f4a02b9d8a440763006af39
│ └── config.json
└── f1cc2170872cd2592d6847db422fbf474c30fc79255c8da883ccbec5b2523f33
└── config.json