如何清理docker产生的垃圾文件-创新互联

无意中感觉磁盘空间不够用，于是使用df -a命令查看，结果令人大吃一惊，全是docker干的好事，在/var/lib/docker/aufs里生成了一堆垃圾：

davidhopper@davidhopper-ThinkPad-P50s:~$ df -a
文件系统     1K-块   已用  可用 已用% 挂载点
sysfs         0    0    0   - /sys
proc         0    0    0   - /proc
udev      8112832    0 8112832  0% /dev
devpts        0    0    0   - /dev/pts
tmpfs      1627828   9580 1618248  1% /run
/dev/sda6   84293120 77948404 2039772  98% /
securityfs      0    0    0   - /sys/kernel/security
tmpfs      8139124  18040 8121084  1% /dev/shm
tmpfs       5120    4  5116  1% /run/lock
tmpfs      8139124    0 8139124  0% /sys/fs/cgroup
cgroup        0    0    0   - /sys/fs/cgroup/systemd
pstore        0    0    0   - /sys/fs/pstore
efivarfs       0    0    0   - /sys/firmware/efi/efivars
cgroup        0    0    0   - /sys/fs/cgroup/net_cls,net_prio
cgroup        0    0    0   - /sys/fs/cgroup/perf_event
cgroup        0    0    0   - /sys/fs/cgroup/cpu,cpuacct
cgroup        0    0    0   - /sys/fs/cgroup/pids
cgroup        0    0    0   - /sys/fs/cgroup/devices
cgroup        0    0    0   - /sys/fs/cgroup/cpuset
cgroup        0    0    0   - /sys/fs/cgroup/rdma
cgroup        0    0    0   - /sys/fs/cgroup/blkio
cgroup        0    0    0   - /sys/fs/cgroup/hugetlb
cgroup        0    0    0   - /sys/fs/cgroup/freezer
cgroup        0    0    0   - /sys/fs/cgroup/memory
systemd-1       -    -    -   - /proc/sys/fs/binfmt_misc
debugfs        0    0    0   - /sys/kernel/debug
mqueue        0    0    0   - /dev/mqueue
hugetlbfs       0    0    0   - /dev/hugepages
fusectl        0    0    0   - /sys/fs/fuse/connections
configfs       0    0    0   - /sys/kernel/config
/dev/sda1    262144  33084 229060  13% /boot/efi
binfmt_misc      0    0    0   - /proc/sys/fs/binfmt_misc
tmpfs      1627828    56 1627772  1% /run/user/1000
gvfsd-fuse      0    0    0   - /run/user/1000/gvfs
/dev/sda6   84293120 77948404 2039772  98% /var/lib/docker/aufs