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odroid-c2:application_note:software:overlayfs_odroidc2 [2018/07/11 09:38]
luke.go ↷ Page moved from internal:overlayfs_odroidc2 to odroid-c2:application_note:software:overlayfs_odroidc2
odroid-c2:application_note:software:overlayfs_odroidc2 [2018/07/11 14:31] (current)
moon.linux
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 OverlayFS provides a great way to merge directories or filesystems such that one of the filesystems (called the "​lower"​ one) never gets written to, but all changes are made to the "​upper"​ one. This is great for systems that rely on having read-only data, but the view needs to be editable, such as Live CD's and Docker containers/​images (image is read only). This also allows you to quickly add some storage to an existing filesystem that is running out of space, without having to alter any structures. It could also be a useful component of a backup/​snapshot system. OverlayFS provides a great way to merge directories or filesystems such that one of the filesystems (called the "​lower"​ one) never gets written to, but all changes are made to the "​upper"​ one. This is great for systems that rely on having read-only data, but the view needs to be editable, such as Live CD's and Docker containers/​images (image is read only). This also allows you to quickly add some storage to an existing filesystem that is running out of space, without having to alter any structures. It could also be a useful component of a backup/​snapshot system.
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 +<WRAP round tip 60%>
 +This guides is tested on Ubuntu 18.04 LTS (GNU/Linux 3.16.57-24 aarch64).
 +</​WRAP>​
  
 ===Overlayfs simplest case - Directories Only=== ===Overlayfs simplest case - Directories Only===