I understand that to enable overlay file system we nedd to make changes in the overlayroot.conf file and reboot the system. But is it possible without rebooting my system
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The /etc/overlayroot.conf file only exists if you install the package overlayroot, an encrypted overlay for use in cloud environments. Here's an article about Overlayroot by it's creator Dustin Kirkland.
The overlayroot.conf file is unnecessary if you just want to mount an overlay filesystem. Overlayfs is available and ready to use as soon as your Trusty Tahr installation is complete.
I'd been struggling to get an overlay filesystem to work for / right from boot without mounting it manually, but was directed to the very useful askubuntu wiki here. Very useful to rebuild the initramfs, and get the overlayfs in place as soon as your system starts.
Hope this helps!
Arronical
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