刚学习docker，在验证数据卷的备份和还原，发现用于还原的中间生产的容器都无法start
dockerrun -it --name demo2backup --volumes-from demo2 -v/home/lxh/files/backup:/backup ubuntu tar cvfP/backup/demo2backup.tar /data
sudodocker run --volumes-from demo2 -v /home/lxh/files/backup/:/backupubuntu tar xvfP /backup/demo2backup .tar
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root@T430:/home/lxh/files/backup# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a71e15709b4 ubuntu "tar xvfP /backup/..." 17 minutes ago Exited (0) 11 minutes ago blissful_kirch
adeba6ef546b ubuntu "tar cvfP /backup/..." 33 minutes ago Exited (0) 13 minutes ago demo2backup
0e47d2220a9f ubuntu "/bin/sh" About an hour ago Up 17 minutes demo2
7d5d8dee668f ubuntu "/bin/bash" 3 hours ago Up 3 hours demo1
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容器blissful_kirch和demo2backup都无法start，请大神解释下，谢谢