Hi, On Tue, Mar 01, 2016 at 11:21:11AM +0000, Phil Mayers wrote: > Upgrades != Fresh installs, unless the OS is a complete, self-contained, > read-only image, with the only mutable state being config applied to the > ramdisk *after* boot ;o)
True, and that's actually an option I'd love to see for XR.
Possibly similar to what OpenWRT does.
"Here, take this immutable file system image, and mount this *other*
file system image read/write on top of it (overlayfs)"
So you can always see exactly which files got modified, and potentially
undo everything ("rm -rf /overlay/*"). Patches get installed to the
overlay file system, major upgrades replace /rom/ with a new base
image and clean the /overlay/ filesystem of everything that is not
a recognized config file.
But of course this is all hobbyist stuff, not something a professional
software engineering company like Cisco would ever consider. Right?
gert
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