以下 Dockerfile 在构建时会引发错误。有没有办法在构建容器时使用mountwith ？overlay
Dockerfile
FROM ubuntu:15.10
RUN mkdir /var/data \
&& mkdir /var/data/delta \
&& mkdir /var/data/delta/changes \
&& mkdir /var/data/delta/workdir \
&& mkdir /var/data/merged \
&& mkdir /var/data/lower
RUN mount -t overlay overlay -o lowerdir=/var/data/lower,upperdir=/var/data/delta/changes,workdir=/var/data/delta/workdir /var/data/merged
错误
...
Step 2 : RUN mount -t overlay overlay -o lowerdir=/var/data/lower,upperdir=/var/data/delta/changes,workdir=/var/data/delta/workdir /var/data/merged
---> Running in 37434cc88e15
mount: overlay is write-protected, mounting read-only
mount: cannot mount overlay read-only
Removing intermediate container 37434cc88e15
The command '/bin/sh -c mount -t overlay …