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apptainer-overlay: add page (#20706)

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Signed-off-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>
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Emmanuel Ferdman
2026-01-13 11:42:53 +07:00
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pages/linux/apptainer-overlay.md
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# apptainer overlay
> Manage EXT3 writable overlay images for Apptainer containers.
> More information: <https://apptainer.org/docs/user/main/cli/apptainer_overlay.html>.
- Add a writable overlay to an existing SIF image:
`apptainer overlay create {{[-s|--size]}} {{size}} {{path/to/image.sif}}`
- Create a standalone EXT3 writable overlay image:
`apptainer overlay create {{[-s|--size]}} {{size}} {{path/to/overlay.img}}`
- Create a sparse overlay image:
`apptainer overlay create {{[-s|--size]}} {{size}} {{[-S|--sparse]}} {{path/to/overlay.img}}`
- Create an overlay for use with fakeroot:
`apptainer overlay create {{[-f|--fakeroot]}} {{[-s|--size]}} {{size}} {{path/to/overlay.img}}`
- Create an overlay with a specific directory in the layout:
`apptainer overlay create --create-dir {{path/to/directory}} {{path/to/overlay.img}}`
- Display help:
`apptainer overlay {{[-h|--help]}}`