我尝试将overlayfs层挂载到下一层overlayfs上，但是在两层之后它会崩溃
mount -t overlayfs -o rw,lowerdir=/tmp/test/layers/centos5.6-layer0-lower,upperdir=/tmp/test/layers/centos5.6-layer0-upper overlayfs /tmp/mount/centos5.6-layer0-mount # remove deleted files into overlayfs find /tmp/mount/centos5.6-layer0-mount -lname '(overlay-whiteout)' -exec rm -rf {} \; mount -t overlayfs -o rw,lowerdir=/tmp/mount/centos5.6-layer0-mount,upperdir=/tmp/test/layers/centos5.6-layer1-upper overlayfs /tmp/mount/centos5.6-layer1-mount # remove deleted files into overlayfs find /tmp/mount/centos5.6-layer1-mount -lname '(overlay-whiteout)' -exec rm -rf {} \; mount -t overlayfs -o rw,lowerdir=/tmp/mount/centos5.6-layer1-mount,upperdir=/tmp/test/layers/centos5.6-layer2-upper overlayfs /tmp/mount/centos5.6-layer2-mount mount: wrong fs type, bad option, bad superblock on overlayfs, missing codepage or helper program, or other error (for several filesystems (eg nfs, cifs) you might need a /sbin/mount.<type> helper program) In some cases useful info is found in syslog - try dmesg | tail or so # remove deleted files into overlayfs find /tmp/mount/centos5.6-layer2-mount -lname '(overlay-whiteout)' -exec rm -rf {} \; mount -t overlayfs -o rw,lowerdir=/tmp/mount/centos5.6-layer2-mount,upperdir=/tmp/test/layers/centos5.6-layer3-upper overlayfs /tmp/mount/centos5.6-layer3-mount find /tmp/mount/centos5.6-layer3-mount -lname '(overlay-whiteout)' -exec rm -rf {} \; 我怎样才能提供更多的2层？
如果您检查dmesg输出，您会看到内核说明尝试超过最大堆栈深度：
overlayfs: maximum fs stacking depth exceeded
实际上，堆栈深度限制为2，请参阅overlayfs dev分支：
如果你想超越这个深度，你可以尝试改变常量，建立你自己的内核。 但是，请记住溢出堆栈的风险（根据注释）。