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cheatsheet-tldr/tldr/linux/apptainer-overlay
2026-01-14 00:22:52 +00:00

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---
syntax: markdown
tags: [tldr, linux]
source: https://github.com/tldr-pages/tldr.git
---
# 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]}}`