Hi Sameer.
There is a very simple alternative in case you only need to update
a small number of well known files: softlink them to some r/w location,
like /var/run or /lib/init/rw, which you mount on tmpfs. The second of
these locations is created early in newer Debian versions and used by
some packages like resolvconf.
Didier
Le 31/05/2012 08:04, Bartos-Elekes Zsolt a écrit :
Michael Conrad wrote:
Unionfs has one problem though: the only way to get correct behavior
is to merge path A and B onto mountpoint C. (C can't be the same as
A or B).
Perhaps this is valid only for older versions of unionfs. I am using
unionfs mounted on /var that is composed of a tmpfs mounted on
/mnt/tmpfs, and the original /var that is on the flash (containing
only a few important files and directories that must be preserved
across reboots, like /var/lib/dpkg).
$ mount | grep "unionfs"
unionfs on /var type unionfs (rw,relatime,dirs=/mnt/tmpfs=rw:/var=rw)
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