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cheatsheet-tldr/tldr/linux/apptainer-sign
2026-01-13 00:19:20 +00:00

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---
syntax: markdown
tags: [tldr, linux]
source: https://github.com/tldr-pages/tldr.git
---
# apptainer sign
> Add digital signatures to a SIF container image.
> See also: `apptainer-verify`.
> More information: <https://apptainer.org/docs/user/main/cli/apptainer_sign.html>.
- Sign a container image using the default PGP key:
`apptainer sign {{path/to/image.sif}}`
- Sign a container image using a specific private key file:
`apptainer sign --key {{path/to/private.pem}} {{path/to/image.sif}}`
- Sign a container image using a specific PGP key index:
`apptainer sign {{[-k|--keyidx]}} {{key_index}} {{path/to/image.sif}}`
- Sign a specific object group within the image:
`apptainer sign {{[-g|--group-id]}} {{group_id}} {{path/to/image.sif}}`
- Sign a specific object by ID within the image:
`apptainer sign {{[-i|--sif-id]}} {{object_id}} {{path/to/image.sif}}`
- Display help:
`apptainer sign {{[-h|--help]}}`