挂载aufs文件系统：mount.aufs

EXAMPLES

The mount options are interpreted from left to right at remount-time. These examples shows how the options are handled. (assuming /sbin/mount.aufs was installed)

 # mount -v -t aufs br:/day0:/base none /u
 none on /u type aufs (rw,xino=/day0/.aufs.xino,br:/day0=rw:/base=ro)
 # mount -v -o remount,\
         prepend:/day1,\
         xino=/day1/xino,\
         mod:/day0=ro,\
         del:/day0 \
         /u
 none on /u type aufs (rw,xino=/day1/xino,br:/day1=rw:/base=ro)
 

 # mount -t aufs br:/rw none /u
 # mount -o remount,append:/ro /u
 different uid/gid/permission, /ro
 # mount -o remount,del:/ro /u
 # mount -o remount,nowarn_perm,append:/ro /u
 #
 (there is no warning)
 

When you use aufs as root filesystem, it is recommended to consider to exclude some directories. For example, /tmp and /var/log are not need to stack in many cases. They don't usually need to copyup or to whiteout.

And there is a good sample which is for network booted diskless machines. See sample/ in detail.