Read-only boot mode is useful if you want:
- make some potentially harmful changes in system, test these changes and configuration
- protect the flash-drive (limited number of write operations)
- use high secure/non-invasive environment
- decide when your changes/staff will be saved
An example how to do it (Ubuntu - aufs, overlayfs) is here: https://help.ubuntu.com/community/aufsR ... OnUsbFlash
A basic examples how to use aufs: http://www.thegeekstuff.com/2013/05/linux-aufs/
Post tutorials, HOWTO's and other useful resources here.
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