一、運行容器報錯：Error response from daemon: Error running DeviceCreate (createSnapDevice) dm_task_run failed
解決：
metadata目錄在 docker info查看
service docker stop thin_check /var/lib/docker/devicemapper/devicemapper/metadata thin_check --clear-needs-check-flag /var/lib/docker/devicemapper/devicemapper/metadata service docker start
二、Error running DeviceCreate (ActivateDevice) dm_task_run failed
重啟docker服務器后 遇到 ‘device or resource busy’錯誤
如果有container在運行的時候重啟 docker 服務， 可能會導致 container無法啟動， 錯誤信息類似於：
Error response from daemon: Cannot start container zookeeper: Error getting container ddf1dd91bbf46dc648268327f8f7c6fffaf2f19cda5cf1d97fdc701016d4332c from driver devicemapper: Error mounting '/dev/mapper/docker-8:1-525372-ddf1dd91bbf46dc648268327f8f7c6fffaf2f19cda5cf1d97fdc701016d4332c' on '/var/lib/docker/devicemapper/mnt/ddf1dd91bbf46dc648268327f8f7c6fffaf2f19cda5cf1d97fdc701016d4332c': device or resource busy 2015/01/26 04:42:07 Error: failed to start one or more containers
或者：
d2859bd1f84b: Error pulling image (latest) from xxxxxx, Driver devicemapper failed to create image rootfs e6158e7962db43274de40fc3db65ad64811d43fe342dea633df20639f5a4e3cd: device e6158e7962db43274de40fc3db65ad64811d43fe342dea633df20639f5a4e3cd already exists 43fe342dea633df20639f5a4e3cd already exists c049b2b: Download complete e6158e7962db: Error downloading dependent layers
解決：
這是一個Docker的 bug ，解決方式是先找出沒有umount的路徑
cat /proc/mounts | grep "mapper/docker" | awk '{print $2}' 然后依次 umount
三、[8] System error: fork/exec /usr/bin/docker: cannot allocate memory問題
The fix for me was to add swapspace. By default my digitalocean droplet didn’t come with any swap!
dd if=/dev/zero of=/root/myswapfile bs=1M count=1024 chmod 600 /root/myswapfile mkswap -f /root/myswapfile swapon /root/myswapfile
四、 防火牆變動異常
一般異常為：
Error response from daemon: Cannot start container web: iptables failed: iptables -t nat -A DOCKER -p tcp -d 0/0 --dport 32797 -j DNAT --to-destination 172.17.0.30:5000 ! -i docker0: iptables: No chain/target/match by that name.
解決辦法：重建docker0網絡恢復：
關閉當前防火牆
service iptables stop
重啟docker重新建立防火牆規則
service docker restart
根據需求啟停容器
docker restart[stop] 容器號
參考：https://blog.csdn.net/m0_38012126/article/details/83721501