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apptainer sign — Add digital signatures to a SIF container image. See also: `apptainer-verify`. More information: <ht

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandapptainer signclidigitalsignaturessifaddcontainer

linux

Problem

How to use the apptainer sign command: Add digital signatures to a SIF container image. See also: apptainer-verify. More information: <https://apptainer.org/docs/user/main/cli/apptainer_sign.html>.

Solution

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]}}

Code Snippets

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}}

Context

tldr-pages: linux/apptainer sign

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