docker 版本 1.10.3
一台装有 docker 的机器重启后，没法启动，/var/log/messages 展示如下错误信息：
May 17 11:11:14 gziba-hc03 systemd: Starting Docker Storage Setup...
May 17 11:11:14 gziba-hc03 docker-storage-setup: INFO: Volume group backing root filesystem could not be determined
May 17 11:11:14 gziba-hc03 docker-storage-setup: ERROR: No valid volume group found. Exiting.
May 17 11:11:14 gziba-hc03 systemd: docker-storage-setup.service: main process exited, code=exited, status=1/FAILURE
May 17 11:11:14 gziba-hc03 systemd: Failed to start Docker Storage Setup.
May 17 11:11:14 gziba-hc03 systemd: Unit docker-storage-setup.service entered failed state.
May 17 11:11:14 gziba-hc03 systemd: docker-storage-setup.service failed.
May 17 11:11:14 gziba-hc03 systemd: Starting Docker Application Container Engine...
May 17 11:11:14 gziba-hc03 kernel: bio: create slab <bio-0> at 0
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.758608097+08:00" level=warning msg="devmapper: Usage of loopback dev
ices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev
section."
May 17 11:11:14 gziba-hc03 kernel: bio: create slab <bio-2> at 2
May 17 11:11:14 gziba-hc03 systemd: Device dev-disk-by\x2duuid-7c76915b\x2d948d\x2d4e21\x2dac45\x2d2e1431303e50.device appeared twice wit
h different sysfs paths /sys/devices/virtual/block/loop0 and /sys/devices/virtual/block/dm-1
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.764266939+08:00" level=warning msg="devmapper: Base device already e
xists and has filesystem xfs on it. User specified filesystem will be ignored."
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.766234454+08:00" level=info msg="[graphdriver] using prior storage d
river \"devicemapper\""
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.777057144+08:00" level=warning msg="Docker could not enable SELinux
on the host system"
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.796060039+08:00" level=info msg="Graph migration to content-addressa
bility took 0.00 seconds"
May 17 11:11:14 gziba-hc03 docker-current: time="2018-05-17T11:11:14.798926194+08:00" level=info msg="Firewalld running: false"
May 17 11:11:15 gziba-hc03 docker-current: time="2018-05-17T11:11:15.058681393+08:00" level=fatal msg="Error starting daemon: Error initi
alizing network controller: could not delete the default bridge network: network bridge has active endpoints"
May 17 11:11:15 gziba-hc03 systemd: docker.service: main process exited, code=exited, status=1/FAILURE
May 17 11:11:15 gziba-hc03 systemd: Failed to start Docker Application Container Engine.
May 17 11:11:15 gziba-hc03 systemd: Unit docker.service entered failed state.
May 17 11:11:15 gziba-hc03 systemd: docker.service failed.处理办法：
rm -rm /var/lib/docker/network/
systemctl start docker