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From: Jack Mitchell <ml@communistcode.co.uk>
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Date: Wed, 12 Aug 2015 11:29:28 +0100
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Subject: making /var/log persistent
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I'm trying to make /var/log persistent and I'm having trouble. I've made a 
bbappend to base_files which contains:

dirs755_append = " \
         /var/log \
"

volatiles = "tmp"

Looking in the resulting image, /var/log is indeed now a directory and not a 
symlink to volatile storage, however when the image is flashed to target and 
booted it is reverted back to being a symlink; I assume by some init script?

Can anyone shed any light on what more is required to get a persistent log 
directory.

Cheers,
Jack.