union file systems overlay

mkdir -v lowerdir upperdir workdir overlay
sudo tree
.
├── lowerdir
├── overlay
├── upperdir
└── workdir

lowerdir layer (read only, base layer)
overlay layer (main view)
work layer (diff view, diff layer )

sudo mount -t overlay -o lowerdir=lowerdir,upperdir=upperdir,workdir=workdir overlay overlay

echo test > lowerdir/test

sudo tree
.
├── lowerdir
│   └── test
├── overlay
│   └── test
├── upperdir
└── workdir
└── work

echo 'some new data' >> overlay/test
sudo tree
.
├── lowerdir
│   └── test
├── overlay
│   └── test
├── upperdir
│   └── test
└── workdir
└── work

This is principe how docker is working.

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